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These shares were sold in multiple transactions at prices ranging from $24.94 to $24.96, inclusive."}],"balance_after":1043610,"source":{"system":"sec-edgar","filing":"0001517413-26-000250","document":"wk-form4_1787692000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000250/wk-form4_1787692000.xml","form_type":"4"}},{"id":675874,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-08-25T21:06:43.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":29013,"price":24.29,"value":704725.77,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.94 to $24.93, inclusive."}],"balance_after":1045418,"source":{"system":"sec-edgar","filing":"0001517413-26-000250","document":"wk-form4_1787692000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000250/wk-form4_1787692000.xml","form_type":"4"}},{"id":675873,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-08-25T21:06:43.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":16855,"price":23.64,"value":398452.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026."},{"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 $22.94 to $23.935, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4."}],"balance_after":1074431,"source":{"system":"sec-edgar","filing":"0001517413-26-000250","document":"wk-form4_1787692000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000250/wk-form4_1787692000.xml","form_type":"4"}},{"id":679746,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:04:43.000Z","date":"2026-08-18","kind":"sale","planned":false,"acquired":false,"shares":148015,"price":28.61,"value":4234709.15,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units."},{"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 $28.60 to $29.11, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4."}],"balance_after":1091286,"source":{"system":"sec-edgar","filing":"0001517413-26-000244","document":"wk-form4_1787259880.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000244/wk-form4_1787259880.xml","form_type":"4"}},{"id":765471,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-05-22T21:57:27.000Z","date":"2026-05-21","kind":"sale","planned":false,"acquired":false,"shares":2500,"price":16.48,"value":41200.0,"ownership":{"direct":true},"balance_after":1239301,"source":{"system":"sec-edgar","filing":"0001517413-26-000152","document":"wk-form4_1779487044.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000152/wk-form4_1779487044.xml","form_type":"4"}},{"id":765470,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-05-22T21:57:27.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":2500,"price":9.27,"value":23175.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares acquired under the Fastly, Inc. 2019 Employee Stock Purchase Plan in a transaction exempt under Rule 16b-3(c)."}],"balance_after":1241801,"source":{"system":"sec-edgar","filing":"0001517413-26-000152","document":"wk-form4_1779487044.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000152/wk-form4_1779487044.xml","form_type":"4"}},{"id":769661,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-05-20T22:00:29.000Z","date":"2026-05-19","kind":"sale","planned":false,"acquired":false,"shares":6315,"price":16.35,"value":103250.25,"ownership":{"direct":true},"balance_after":1239301,"source":{"system":"sec-edgar","filing":"0001517413-26-000150","document":"wk-form4_1779314427.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000150/wk-form4_1779314427.xml","form_type":"4"}},{"id":769660,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-05-20T22:00:29.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":3592,"price":16.85,"value":60525.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units."},{"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 $16.76 to $16.85, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4."}],"balance_after":1245616,"source":{"system":"sec-edgar","filing":"0001517413-26-000150","document":"wk-form4_1779314427.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000150/wk-form4_1779314427.xml","form_type":"4"}},{"id":850443,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-03-10T20:52:35.000Z","date":"2026-03-06","kind":"sale","planned":false,"acquired":false,"shares":5494,"price":21.08,"value":115813.52,"ownership":{"direct":true},"balance_after":1249208,"source":{"system":"sec-edgar","filing":"0001517413-26-000105","document":"wk-form4_1773175952.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000105/wk-form4_1773175952.xml","form_type":"4"}},{"id":857981,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-03-05T21:56:39.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":118885,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting. One-twelfth (8.33%) of the total RSUs will vest on May 15, 2026 and the remainder will vest in 11 equal quarterly installments (August, November, February and May) of one-twelfth thereafter (8.33% of the total RSUs will vest per quarter), in each case subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":1254702,"source":{"system":"sec-edgar","filing":"0001517413-26-000095","document":"wk-form4_1772747796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000095/wk-form4_1772747796.xml","form_type":"4"}},{"id":860897,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-03-04T21:07:51.000Z","date":"2026-03-03","kind":"sale","planned":false,"acquired":false,"shares":3748,"price":20.3,"value":76084.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units."},{"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 $19.92 to $20.31, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4."}],"balance_after":1135817,"source":{"system":"sec-edgar","filing":"0001517413-26-000085","document":"wk-form4_1772658465.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000085/wk-form4_1772658465.xml","form_type":"4"}},{"id":865556,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-03-03T21:42:54.000Z","date":"2026-02-28","kind":"grant","planned":false,"acquired":true,"shares":9242,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Fully vested. Under the 2025 Bonus Plan, subject to meeting performance criteria, the reporting person was eligible to receive a bonus to be paid in the form of fully-vested restricted stock units."}],"balance_after":1139565,"source":{"system":"sec-edgar","filing":"0001517413-26-000080","document":"wk-form4_1772574170.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000080/wk-form4_1772574170.xml","form_type":"4"}},{"id":1046699,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":19823,"kind":"person","name":"WONG RICHARD","position":1,"cik":"0002082904","reported_name":"WONG RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2025-09-05T21:13:24.000Z","date":"2025-09-03","kind":"grant","planned":false,"acquired":true,"shares":1130323,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs\nare initially subject to vesting. One-forth (25%) of the total RSUs will vest on August 15, 2026 and the remainder will vest in  quarterly installments (November, February, May, and\nAugust) of one-sixteenth thereafter (6.25% of the total RSUs will vest per quarter), provided in each case that the grantee is providing Continuous Service (as defined in the Inducement Plan) to the Company. Provided that if a quarterly vesting date occurs on any day that is not a trading day, the quarterly vesting date shall instead be the next trading day."}],"balance_after":1130323,"source":{"system":"sec-edgar","filing":"0001517413-25-000257","document":"wk-form4_1757106800.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741325000257/wk-form4_1757106800.xml","form_type":"4"}}]}