{"transactions":[{"id":3174074,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-17T17:01:13.000Z","date":"2020-04-15","kind":"other","acquired":false,"shares":122400,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On April 15, 2020, Accel Investors 2009 L.L.C. distributed, for no consideration, 122,400 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":39600,"source":{"system":"sec-edgar","filing":"0000899243-20-010905","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010905/doc4.xml","form_type":"4"}},{"id":3174073,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-17T17:01:13.000Z","date":"2020-04-15","kind":"other","acquired":false,"shares":228820,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On April 15, 2020, Accel X Strategic Partners L.P. distributed, for no consideration, 228,820 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by Accel X Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":74030,"source":{"system":"sec-edgar","filing":"0000899243-20-010905","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010905/doc4.xml","form_type":"4"}},{"id":3174072,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-17T17:01:13.000Z","date":"2020-04-15","kind":"other","acquired":false,"shares":3048780,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On April 15, 2020, Accel X L.P. distributed, for no consideration, 3,048,780 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X Associates L.L.C. (\"Accel X GP\"), the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P. Accel X GP is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":986370,"source":{"system":"sec-edgar","filing":"0000899243-20-010905","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010905/doc4.xml","form_type":"4"}},{"id":3177950,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":false,"shares":360000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":575490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":360000},"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177949,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":false,"shares":673000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":1075840,"derivative":{"underlying":"Class A Common Stock","underlying_shares":673000},"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177948,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":false,"shares":8967000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":14333970,"derivative":{"underlying":"Class A Common Stock","underlying_shares":8967000},"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177947,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"other","acquired":false,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On April 9, 2020, Accel Investors 2009 L.L.C. distributed, for no consideration, 198,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":162000,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177946,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":true,"shares":360000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":360000,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177945,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"other","acquired":false,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On April 9, 2020, Accel X Strategic Partners L.P. distributed, for no consideration, 370,150 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":302850,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177944,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":true,"shares":673000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":673000,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177943,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"other","acquired":false,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On April 9, 2020, Accel X L.P. distributed, for no consideration, 4,931,850 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4035150,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3177942,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-04-13T17:02:26.000Z","date":"2020-04-09","kind":"exercise","acquired":true,"shares":8967000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":8967000,"source":{"system":"sec-edgar","filing":"0000899243-20-010668","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320010668/doc4.xml","form_type":"4"}},{"id":3192116,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":935490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":180000},"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192115,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"(These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":1748840,"derivative":{"underlying":"Class A Common Stock","underlying_shares":336500},"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192114,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":23300970,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4483500},"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192113,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"other","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On March 26, 2020, Accel Investors 2009 L.L.C. distributed, for no consideration, 180,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192112,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":true,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":180000,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192111,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"other","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On March 26, 2020, Accel X Strategic Partners L.P. distributed, for no consideration, 336,500 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"(These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192110,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":true,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"(These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":336500,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192109,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"other","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On March 26, 2020, Accel X L.P. distributed, for no consideration, 4,483,500 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3192108,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-30T17:01:49.000Z","date":"2020-03-26","kind":"exercise","acquired":true,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4483500,"source":{"system":"sec-edgar","filing":"0000899243-20-009648","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009648/doc4.xml","form_type":"4"}},{"id":3200712,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":1115490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":180000},"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200711,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":2085340,"derivative":{"underlying":"Class A Common Stock","underlying_shares":336500},"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200710,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":27784470,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4483500},"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200709,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"other","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On March 17, 2020, Accel Investors 2009 L.L.C. distributed, for no consideration, 180,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200708,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":true,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":180000,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200707,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"other","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On March 17, 2020, Accel X Strategic Partners L.P. distributed, for no consideration, 336,500 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200706,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":true,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":336500,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200705,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"other","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On March 17, 2020, Accel X L.P. distributed, for no consideration, 4,483,500 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3200704,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-03-19T17:00:53.000Z","date":"2020-03-17","kind":"exercise","acquired":true,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4483500,"source":{"system":"sec-edgar","filing":"0000899243-20-009012","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320009012/doc4.xml","form_type":"4"}},{"id":3310764,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":false,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":1295490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":198000},"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310763,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":false,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":2421840,"derivative":{"underlying":"Class A Common Stock","underlying_shares":370150},"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310762,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":false,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":32267970,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4931850},"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310761,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"other","acquired":false,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On January 13, 2020, Accel Investors 2009 L.L.C. distributed, for no consideration, 198,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310760,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":true,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":198000,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310759,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"other","acquired":false,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On January 13, 2020, Accel X Strategic Partners L.P. distributed, for no consideration, 370,150 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310758,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":true,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":370150,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310757,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"other","acquired":false,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On January 13, 2020, Accel X L.P. distributed, for no consideration, 4,931,850 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3310756,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2020-01-15T17:04:43.000Z","date":"2020-01-13","kind":"exercise","acquired":true,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4931850,"source":{"system":"sec-edgar","filing":"0000899243-20-001255","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924320001255/doc4.xml","form_type":"4"}},{"id":3345302,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":false,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":1493490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":198000},"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345301,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":false,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":2791990,"derivative":{"underlying":"Class A Common Stock","underlying_shares":370150},"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345300,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":false,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":37199820,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4931850},"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345299,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"other","acquired":false,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On December 9, 2019, Accel Investors 2009 L.L.C. distributed, for no consideration, 198,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345298,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":true,"shares":198000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":198000,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345297,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"other","acquired":false,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On December 9, 2019, Accel X Strategic Partners L.P. distributed, for no consideration, 370,150 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345296,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":true,"shares":370150,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":370150,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345295,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"other","acquired":false,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On December 9, 2019, Accel X L.P. distributed, for no consideration, 4,931,850 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3345294,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-12-11T16:30:48.000Z","date":"2019-12-09","kind":"exercise","acquired":true,"shares":4931850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4931850,"source":{"system":"sec-edgar","filing":"0000899243-19-028928","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319028928/doc4.xml","form_type":"4"}},{"id":3393672,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":1691490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":180000},"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393671,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":3162140,"derivative":{"underlying":"Class A Common Stock","underlying_shares":336500},"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393670,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":42131670,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4483500},"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393669,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"other","acquired":false,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On October 11, 2019, Accel Investors 2009 L.L.C. distributed, for no consideration, 180,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393668,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":true,"shares":180000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":180000,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393667,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"other","acquired":false,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On October 11, 2019, Accel X Strategic Partners L.P. distributed, for no consideration, 336,500 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393666,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":true,"shares":336500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":336500,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393665,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"other","acquired":false,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On October 11, 2019, Accel X L.P. distributed, for no consideration, 4,483,500 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3393664,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-10-15T19:02:53.000Z","date":"2019-10-11","kind":"exercise","acquired":true,"shares":4483500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":4483500,"source":{"system":"sec-edgar","filing":"0000899243-19-025587","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000089924319025587/doc4.xml","form_type":"4"}},{"id":3461900,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":false,"shares":193627,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":1871490,"derivative":{"underlying":"Class A Common Stock","underlying_shares":193627},"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461899,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":false,"shares":361977,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":3498640,"derivative":{"underlying":"Class A Common Stock","underlying_shares":361977},"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461898,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":false,"shares":4823070,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":46615170,"derivative":{"underlying":"Class A Common Stock","underlying_shares":4823070},"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461897,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"other","acquired":false,"shares":216000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On July 11, 2019, Accel Investors 2009 L.L.C. distributed, for no consideration, 216,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461896,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":true,"shares":193627,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":216000,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461895,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"other","acquired":false,"shares":403800,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On July 11, 2019, Accel X Strategic Partners L.P. distributed, for no consideration, 403,800 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461894,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":true,"shares":361977,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":403800,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461893,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"other","acquired":false,"shares":5380200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On July 11, 2019, Accel X L.P. distributed, for no consideration, 5,380,200 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3461892,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-07-15T18:05:15.000Z","date":"2019-07-11","kind":"exercise","acquired":true,"shares":4823070,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":5380200,"source":{"system":"sec-edgar","filing":"0001628280-19-008759","document":"wf-form4_156322830061960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008759/wf-form4_156322830061960.xml","form_type":"4"}},{"id":3480117,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"other","acquired":false,"shares":360000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"On June 20, 2019, Accel Investors 2009 L.L.C. distributed, for no consideration, 360,000 shares of Class A common stock of the Issuer (the \"Accel 2009 Shares\") to its members, representing each such member's pro rata interest in such Accel 2009 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":22373,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480116,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":36000,"price":40.76,"value":1467360.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $40.50 to $41.05.  The reporting persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":382373,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480115,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":270000,"price":38.5,"value":10395000.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2009 L.L.C."}],"balance_after":418373,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480114,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"other","acquired":false,"shares":673000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"On June 20, 2019, Accel X Strategic Partners L.P. distributed, for no consideration, 673,000 shares of Class A common stock of the Issuer (the \"Accel X Strategic Shares\") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":41823,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480113,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":67300,"price":40.76,"value":2743148.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $40.50 to $41.05.  The reporting persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":714823,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480112,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":504750,"price":38.5,"value":19432875.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":782123,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480111,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"other","acquired":false,"shares":8967000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"On June 20, 2019, Accel X L.P. distributed, for no consideration, 8,967,000 shares of Class A common stock of the Issuer (the \"Accel X Shares\") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":557130,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480110,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":896700,"price":40.76,"value":36549492.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $40.50 to $41.05.  The reporting persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":9524130,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3480109,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-24T20:52:56.000Z","date":"2019-06-20","kind":"sale","acquired":false,"shares":6725250,"price":38.5,"value":258922125.0,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"These shares are held by Accel X L.P.  Accel X Associates L.L.C. (\"Accel X GP\") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the \"Accel X Entities\"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose."}],"balance_after":10420830,"source":{"system":"sec-edgar","filing":"0001628280-19-008300","document":"wf-form4_156142396022444.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008300/wf-form4_156142396022444.xml","form_type":"4"}},{"id":3489579,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":387596,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2013 L.L.C."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2013 L.L.C.  The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C."}],"balance_after":1162788,"derivative":{"underlying":"Class A Common Stock","underlying_shares":387596},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489578,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":274210,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI Strategic Partners L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Accel XI Strategic Partners L.P. Accel XI Associates L.L.C. is the general partner of each of the Accel XI Entities. The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":822630,"derivative":{"underlying":"Class A Common Stock","underlying_shares":274210},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489577,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":3649641,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel XI LP. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the \"Accel XI Entities\"). The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":10948923,"derivative":{"underlying":"Class A Common Stock","underlying_shares":3649641},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489576,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":688373,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Accel Investors 2009 L.L.C.  The managing member of Accel Investors 2009 L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2009 L.L.C."}],"balance_after":2065117,"derivative":{"underlying":"Class A Common Stock","underlying_shares":688373},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489575,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":1286873,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X Associates L.L.C. is the general partner of each of the Accel X Entities. The managing members of Accel X Associates L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities, and its managing members share such powers."}],"balance_after":3860617,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1286873},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489574,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":false,"shares":17146080,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"shares","element":"transactionShares","label":"F7","text":"Due to a clerical error, the Form 4 filed on June 12, 2019 inadvertently reflected in Column 5 of Table II that, in connection with the conversion of shares of Class B Common Stock to Class A Common Stock, shares of Class B Common Stock were acquired rather than disposed of. This amendment is being filed to correct Column 5 of Table II. All other information set forth in the June 12, 2019 Form 4 remains correct and is restated in its entirety."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."}],"balance_after":51438240,"derivative":{"underlying":"Class A Common Stock","underlying_shares":17146080},"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489573,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":387596,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2013 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2013 L.L.C.  The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C."}],"balance_after":387596,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489572,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":274210,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Accel XI Strategic Partners L.P. Accel XI Associates L.L.C. is the general partner of each of the Accel XI Entities. The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":274210,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489571,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":3649641,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel XI LP. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the \"Accel XI Entities\"). The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":3649641,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489570,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":688373,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Accel Investors 2009 L.L.C.  The managing member of Accel Investors 2009 L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2009 L.L.C."}],"balance_after":688373,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489569,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":1286873,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X Associates L.L.C. is the general partner of each of the Accel X Entities. The managing members of Accel X Associates L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities, and its managing members share such powers."}],"balance_after":1286873,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3489568,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-14T20:06:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":17146080,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."}],"balance_after":17146080,"source":{"system":"sec-edgar","filing":"0001628280-19-008020","document":"wf-form4a_156055715071246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019008020/wf-form4a_156055715071246.xml","form_type":"4/A","original_submission_date":"2019-06-12"}},{"id":3492824,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":387596,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2013 L.L.C."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2013 L.L.C.  The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C."}],"balance_after":1162788,"derivative":{"underlying":"Class A Common Stock","underlying_shares":387596},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492823,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":274210,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI Strategic Partners L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Accel XI Strategic Partners L.P. Accel XI Associates L.L.C. is the general partner of each of the Accel XI Entities. The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":822630,"derivative":{"underlying":"Class A Common Stock","underlying_shares":274210},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492822,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":3649641,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI L.P."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel XI LP. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the \"Accel XI Entities\"). The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":10948923,"derivative":{"underlying":"Class A Common Stock","underlying_shares":3649641},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492821,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":688373,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Accel Investors 2009 L.L.C.  The managing member of Accel Investors 2009 L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2009 L.L.C."}],"balance_after":2065117,"derivative":{"underlying":"Class A Common Stock","underlying_shares":688373},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492820,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":1286873,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X Associates L.L.C. is the general partner of each of the Accel X Entities. The managing members of Accel X Associates L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities, and its managing members share such powers."}],"balance_after":3860617,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1286873},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492819,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":17146080,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."}],"balance_after":51438240,"derivative":{"underlying":"Class A Common Stock","underlying_shares":17146080},"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492818,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":387596,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2013 L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Accel Investors 2013 L.L.C.  The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C."}],"balance_after":387596,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492817,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":274210,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Accel XI Strategic Partners L.P. Accel XI Associates L.L.C. is the general partner of each of the Accel XI Entities. The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":274210,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492816,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":3649641,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel XI L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Accel XI LP. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the \"Accel XI Entities\"). The managing members of Accel XI Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities, and its managing members share such powers."}],"balance_after":3649641,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492815,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":688373,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2009 L.L.C"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Accel Investors 2009 L.L.C.  The managing member of Accel Investors 2009 L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2009 L.L.C."}],"balance_after":688373,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492814,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":1286873,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel X Strategic Partners L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Accel X Strategic Partners L.P.  Accel X Associates L.L.C. is the general partner of each of the Accel X Entities. The managing members of Accel X Associates L.L.C. are Andrew G. Braccia, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities, and its managing members share such powers."}],"balance_after":1286873,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3492813,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2019-06-12T19:02:06.000Z","date":"2019-06-11","kind":"exercise","acquired":true,"shares":17146080,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date."}],"balance_after":17146080,"source":{"system":"sec-edgar","filing":"0001628280-19-007932","document":"wf-form4_156038051069704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007932/wf-form4_156038051069704.xml","form_type":"4"}},{"id":3497198,"issuer":{"id":137108,"kind":"organization","name":"Slack Technologies, Inc.","symbol":"WORK"},"owners":[{"id":96095,"kind":"organization","name":"Accel X LP","position":1,"cik":"0001419457","reported_name":"Accel X LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96096,"kind":"organization","name":"ACCEL X STRATEGIC PARTNERS LP","position":2,"cik":"0001430231","reported_name":"ACCEL X STRATEGIC PARTNERS LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":96097,"kind":"organization","name":"Accel X Associates L.L.C.","position":3,"cik":"0001494996","reported_name":"Accel X Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149793,"kind":"organization","name":"Accel Investors 2009 L.L.C.","position":4,"cik":"0001494979","reported_name":"Accel Investors 2009 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148414,"kind":"organization","name":"Accel XI L.P.","position":5,"cik":"0001522763","reported_name":"Accel XI L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148415,"kind":"organization","name":"Accel XI Strategic Partners L.P.","position":6,"cik":"0001527391","reported_name":"Accel XI Strategic Partners L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":118389,"kind":"organization","name":"Accel XI Associates L.L.C.","position":7,"cik":"0001535603","reported_name":"Accel XI Associates L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":148416,"kind":"organization","name":"Accel Investors 2013 L.L.C.","position":8,"cik":"0001589159","reported_name":"Accel Investors 2013 L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class B Common Stock","published_at":"2019-06-07T21:23:17.000Z","date":"2019-06-07","kind":"other","acquired":true,"shares":1550384,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Accel Investors 2013 L.L.C."},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the Reporting Person and has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"The Series A, Series B, Series C, Series F-1 and Series H-1 Preferred Stock are each convertible into Class B Common Stock on a 1:1 basis and have no expiration date. Upon the effectiveness of the Issuer's Registration Statement on Form S-1, all shares of preferred stock were converted, in an exempt transaction pursuant to Rule 16b-7, into shares of Class B Common Stock of the Issuer."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the Reporting Person and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the Reporting Person and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"These shares are held by Accel Investors 2013 L.L.C.  The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C."}],"balance_after":1550384,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1550384},"source":{"system":"sec-edgar","filing":"0001628280-19-007826","document":"wf-form4_155995697972366.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":24,"url":"https://www.sec.gov/Archives/edgar/data/1494979/000162828019007826/wf-form4_155995697972366.xml","form_type":"4"}}],"next_cursor":"2019-06-07T21:23:17.000000Z,3497198"}