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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), (4), (5) and (6) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1098317,"source":{"system":"sec-edgar","filing":"0001517413-26-000304","document":"wk-form4_1792011219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000304/wk-form4_1792011219.xml","form_type":"4"}},{"id":4635228,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-30T21:23:53.000Z","date":"2026-09-29","kind":"sale","planned":true,"acquired":false,"shares":3961,"price":25.26,"value":100054.86,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. 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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), (4), (5) and (6) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1592606,"source":{"system":"sec-edgar","filing":"0001517413-26-000296","document":"wk-form4_1790195913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000296/wk-form4_1790195913.xml","form_type":"4"}},{"id":4623452,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":815,"kind":"person","name":"Lovett Scott R.","position":1,"cik":"0002024441","reported_name":"Lovett Scott R.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Go to Market"}}],"security":"Class A Common Stock","published_at":"2026-09-21T20:45:22.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":5690,"price":25.38,"value":144412.2,"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 February 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $22.98 to $23.88, 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":1321598,"source":{"system":"sec-edgar","filing":"0001517413-26-000294","document":"wk-form4_1790023520.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000294/wk-form4_1790023520.xml","form_type":"4"}},{"id":4623449,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":39968,"kind":"person","name":"Ford Jeffrey","position":1,"cik":"0001993556","reported_name":"Ford Jeffrey","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Principal Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-21T20:45:17.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":6338,"price":25.37,"value":160795.06,"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 26, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $23.99 to $24.97, inclusive."}],"balance_after":256199,"source":{"system":"sec-edgar","filing":"0001517413-26-000293","document":"wk-form4_1790023514.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1993556/000151741326000293/wk-form4_1790023514.xml","form_type":"4"}},{"id":4623447,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":39968,"kind":"person","name":"Ford Jeffrey","position":1,"cik":"0001993556","reported_name":"Ford Jeffrey","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Principal Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-21T20:45:17.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":2000,"price":23.57,"value":47140.0,"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 26, 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 $22.98 to $23.93, inclusive. The reporting person undertakes to\nprovide 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\nfootnotes (2), (3) and (4) to this Form 4."}],"balance_after":293693,"source":{"system":"sec-edgar","filing":"0001517413-26-000293","document":"wk-form4_1790023514.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1993556/000151741326000293/wk-form4_1790023514.xml","form_type":"4"}},{"id":4623441,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-21T20:45:11.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":2200,"price":25.3,"value":55660.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 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 $25.00 to $25.60, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1595006,"source":{"system":"sec-edgar","filing":"0001517413-26-000292","document":"wk-form4_1790023508.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000292/wk-form4_1790023508.xml","form_type":"4"}},{"id":4622909,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":39968,"kind":"person","name":"Ford Jeffrey","position":1,"cik":"0001993556","reported_name":"Ford Jeffrey","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Principal Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-18T20:25:35.000Z","date":"2026-09-16","kind":"sale","planned":false,"acquired":false,"shares":37091,"price":23.84,"value":884249.44,"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 $23.84 to $24.04, inclusive. The reporting person undertakes to\nprovide 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\nfootnote (2) to this Form 4."}],"balance_after":295693,"source":{"system":"sec-edgar","filing":"0001517413-26-000288","document":"wk-form4_1789763132.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1993556/000151741326000288/wk-form4_1789763132.xml","form_type":"4"}},{"id":4622910,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":815,"kind":"person","name":"Lovett Scott R.","position":1,"cik":"0002024441","reported_name":"Lovett Scott R.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Go to Market"}}],"security":"Class A Common Stock","published_at":"2026-09-18T20:25:29.000Z","date":"2026-09-16","kind":"sale","planned":false,"acquired":false,"shares":34820,"price":23.85,"value":830457.0,"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 $23.84 to $24.43, 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":1323398,"source":{"system":"sec-edgar","filing":"0001517413-26-000287","document":"wk-form4_1789763127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000287/wk-form4_1789763127.xml","form_type":"4"}},{"id":4619720,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-16T20:59:11.000Z","date":"2026-09-15","kind":"sale","planned":true,"acquired":false,"shares":2500,"price":25.14,"value":62850.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.00 to $25.39, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1597206,"source":{"system":"sec-edgar","filing":"0001517413-26-000284","document":"wk-form4_1789592348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000284/wk-form4_1789592348.xml","form_type":"4"}},{"id":4619719,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-16T20:59:11.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":4500,"price":25.02,"value":112590.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.95 to $25.09, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1599706,"source":{"system":"sec-edgar","filing":"0001517413-26-000284","document":"wk-form4_1789592348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000284/wk-form4_1789592348.xml","form_type":"4"}},{"id":4619718,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-16T20:59:11.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":23879,"price":24.54,"value":585990.66,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.95 to $24.94, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1604206,"source":{"system":"sec-edgar","filing":"0001517413-26-000284","document":"wk-form4_1789592348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000284/wk-form4_1789592348.xml","form_type":"4"}},{"id":4619717,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-16T20:59:11.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":2700,"price":23.6,"value":63720.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 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 $22.95 to $23.93, 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), (4), (5) and (6) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1628085,"source":{"system":"sec-edgar","filing":"0001517413-26-000284","document":"wk-form4_1789592348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000284/wk-form4_1789592348.xml","form_type":"4"}},{"id":4619693,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-16T20:58:44.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":50392,"price":24.93,"value":1256272.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 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 $24.89 to $25.01, 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":851949,"source":{"system":"sec-edgar","filing":"0001517413-26-000282","document":"wk-form4_1789592322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000282/wk-form4_1789592322.xml","form_type":"4"}},{"id":4616089,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-11T21:04:45.000Z","date":"2026-09-09","kind":"sale","planned":true,"acquired":false,"shares":400,"price":24.11,"value":9644.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.89 to $24.34, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1630785,"source":{"system":"sec-edgar","filing":"0001517413-26-000278","document":"wk-form4_1789160682.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000278/wk-form4_1789160682.xml","form_type":"4"}},{"id":4616088,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-11T21:04:45.000Z","date":"2026-09-09","kind":"sale","planned":true,"acquired":false,"shares":8560,"price":22.66,"value":193969.6,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 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 $22.50 to $23.09, 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) and (4) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1631185,"source":{"system":"sec-edgar","filing":"0001517413-26-000278","document":"wk-form4_1789160682.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000278/wk-form4_1789160682.xml","form_type":"4"}},{"id":4614850,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-10T20:51:23.000Z","date":"2026-09-08","kind":"sale","planned":true,"acquired":false,"shares":2436,"price":21.23,"value":51716.28,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026."}],"balance_after":902341,"source":{"system":"sec-edgar","filing":"0001517413-26-000274","document":"wk-form4_1789073480.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000274/wk-form4_1789073480.xml","form_type":"4"}},{"id":4614852,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-10T20:51:09.000Z","date":"2026-09-08","kind":"sale","planned":true,"acquired":false,"shares":300,"price":22.51,"value":6753.0,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 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 $22.50 to $22.51, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1639745,"source":{"system":"sec-edgar","filing":"0001517413-26-000273","document":"wk-form4_1789073466.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000273/wk-form4_1789073466.xml","form_type":"4"}},{"id":3534850,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-08T20:50:34.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":10777,"price":21.08,"value":227179.16,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.00 to $21.21, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1640045,"source":{"system":"sec-edgar","filing":"0001517413-26-000270","document":"wk-form4_1788900631.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000270/wk-form4_1788900631.xml","form_type":"4"}},{"id":3534849,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-08T20:50:34.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":7742,"price":20.66,"value":159949.72,"ownership":{"direct":false,"nature":"See Footnote."},"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 June 4, 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 $20.00 to $20.995, 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 (3) and (5) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The shares are held by The Per Artur Bergman Revocable Trust, of which the reporting person is settlor, sole trustee, and sole beneficiary."}],"balance_after":1650822,"source":{"system":"sec-edgar","filing":"0001517413-26-000270","document":"wk-form4_1788900631.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000270/wk-form4_1788900631.xml","form_type":"4"}},{"id":3534848,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-08T20:50:34.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":17576,"price":20.66,"value":363120.16,"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 June 4, 2026."},{"field":"shares","element":"transactionShares","label":"F2","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 17,576 shares of common stock of the Issuer in a transaction that resulted in a change in\nthe form of beneficial ownership from direct to indirect."},{"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 $20.00 to $20.995, 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 (3) and (5) to this Form 4."}],"balance_after":1896249,"source":{"system":"sec-edgar","filing":"0001517413-26-000270","document":"wk-form4_1788900631.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000270/wk-form4_1788900631.xml","form_type":"4"}},{"id":4731,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-04T21:02:47.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":9458,"price":20.42,"value":193132.36,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 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 $20.26 to $20.75, 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":904777,"source":{"system":"sec-edgar","filing":"0001517413-26-000268","document":"wk-form4_1788555765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000268/wk-form4_1788555765.xml","form_type":"4"}},{"id":937,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:25.000Z","date":"2026-08-31","kind":"sale","planned":false,"acquired":false,"shares":6225,"price":23,"value":143175.0,"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."}],"balance_after":1913825,"source":{"system":"sec-edgar","filing":"0001517413-26-000266","document":"wk-form4_1788383003.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1769490/000151741326000266/wk-form4_1788383003.xml","form_type":"4"}},{"id":936,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:20.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":1100,"price":22.61,"value":24871.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $22.65, inclusive."}],"balance_after":914235,"source":{"system":"sec-edgar","filing":"0001517413-26-000265","document":"wk-form4_1788382997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000265/wk-form4_1788382997.xml","form_type":"4"}},{"id":935,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:20.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":18978,"price":21.86,"value":414859.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.59 to $22.51, inclusive."}],"balance_after":915335,"source":{"system":"sec-edgar","filing":"0001517413-26-000265","document":"wk-form4_1788382997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000265/wk-form4_1788382997.xml","form_type":"4"}},{"id":934,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:20.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":35501,"price":21.1,"value":749071.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 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 $20.59 to $21.58, 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 (3), (4) and (5) to this Form 4."}],"balance_after":934313,"source":{"system":"sec-edgar","filing":"0001517413-26-000265","document":"wk-form4_1788382997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000265/wk-form4_1788382997.xml","form_type":"4"}},{"id":933,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:20.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":15028,"price":23,"value":345644.0,"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."}],"balance_after":969814,"source":{"system":"sec-edgar","filing":"0001517413-26-000265","document":"wk-form4_1788382997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000265/wk-form4_1788382997.xml","form_type":"4"}},{"id":938,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":815,"kind":"person","name":"Lovett Scott R.","position":1,"cik":"0002024441","reported_name":"Lovett Scott R.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Go to Market"}}],"security":"Class A Common Stock","published_at":"2026-09-02T21:03:14.000Z","date":"2026-08-31","kind":"sale","planned":false,"acquired":false,"shares":19624,"price":23,"value":451352.0,"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."}],"balance_after":1358218,"source":{"system":"sec-edgar","filing":"0001517413-26-000264","document":"wk-form4_1788382991.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000264/wk-form4_1788382991.xml","form_type":"4"}},{"id":899,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":786,"kind":"person","name":"PAISLEY CHRISTOPHER B","position":1,"cik":"0001189229","reported_name":"PAISLEY CHRISTOPHER B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-09-02T20:57:56.000Z","date":"2026-08-31","kind":"sale","planned":true,"acquired":false,"shares":3000,"price":23,"value":69000.0,"ownership":{"direct":false,"nature":"See Footnote"},"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 February 26, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amounts reflect the shift from indirect to direct ownership of 1,000 shares to correct an administrative error in the reporting person's Form 4 filed on June 2, 2026, which was carried over on the reporting person's Form 4 filed on June 5, 2026. The June 2, 2026 filing inadvertently reported that the sale of 1,000 shares was deducted from the reporting person directly, rather than the Christopher Paisley TTEE Paisley Living Trust DTD 12/28/94. Total beneficial ownership was correctly reported on both prior filings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The shares are held by the Christopher Paisley TTEE Paisley Living Trust DTD 12/28/94."}],"balance_after":280485,"source":{"system":"sec-edgar","filing":"0001517413-26-000260","document":"wk-form4_1788382673.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000260/wk-form4_1788382673.xml","form_type":"4"}},{"id":671859,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-31T21:00:08.000Z","date":"2026-08-27","kind":"sale","planned":false,"acquired":false,"shares":851,"price":24.08,"value":20492.08,"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":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amounts reflect the shift from direct to indirect ownership of 52,603 shares contributed by Mr. Bergman to the Per Artur Bergman Revocable Trust on August 28, 2026."}],"balance_after":1920050,"source":{"system":"sec-edgar","filing":"0001517413-26-000258","document":"wk-form4_1788210006.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000258/wk-form4_1788210006.xml","form_type":"4"}},{"id":675875,"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":1808,"price":24.95,"value":45109.6,"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":"F4","text":"The price reported in Column 4 is a weighted average price. 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":680228,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":815,"kind":"person","name":"Lovett Scott R.","position":1,"cik":"0002024441","reported_name":"Lovett Scott R.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Go to Market"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:08:10.000Z","date":"2026-08-18","kind":"sale","planned":false,"acquired":false,"shares":14936,"price":28.6,"value":427169.6,"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":1377842,"source":{"system":"sec-edgar","filing":"0001517413-26-000246","document":"wk-form4_1787260088.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000246/wk-form4_1787260088.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":680313,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:39.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":700,"price":26.05,"value":18235.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $24.64 to $25.57, inclusive."}],"balance_after":985542,"source":{"system":"sec-edgar","filing":"0001517413-26-000242","document":"wk-form4_1787259697.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000242/wk-form4_1787259697.xml","form_type":"4"}},{"id":680311,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:39.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":5098,"price":24.08,"value":122759.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.63 to $24.62, inclusive."}],"balance_after":990942,"source":{"system":"sec-edgar","filing":"0001517413-26-000242","document":"wk-form4_1787259697.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000242/wk-form4_1787259697.xml","form_type":"4"}},{"id":680310,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:39.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":34552,"price":28.6,"value":988187.2,"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 $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 ranges set forth in footnotes (2), (4), (5) and (6) to this Form 4."}],"balance_after":996040,"source":{"system":"sec-edgar","filing":"0001517413-26-000242","document":"wk-form4_1787259697.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000242/wk-form4_1787259697.xml","form_type":"4"}},{"id":679745,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:01.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":4164,"price":25.78,"value":107347.92,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 31,687 shares of common stock of the Issuer in a transaction that resulted in a change in the form of beneficial ownership from direct to indirect."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.58 to $26.56, inclusive."}],"balance_after":1973504,"source":{"system":"sec-edgar","filing":"0001517413-26-000240","document":"wk-form4_1787259658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000240/wk-form4_1787259658.xml","form_type":"4"}},{"id":679744,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:01.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":16435,"price":24.98,"value":410546.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 31,687 shares of common stock of the Issuer in a transaction that resulted in a change in the form of beneficial ownership from direct to indirect."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.57 to $25.56, inclusive."}],"balance_after":1977668,"source":{"system":"sec-edgar","filing":"0001517413-26-000240","document":"wk-form4_1787259658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000240/wk-form4_1787259658.xml","form_type":"4"}},{"id":679743,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:01.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":11088,"price":23.94,"value":265446.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"shares","element":"transactionShares","label":"F5","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 31,687 shares of common stock of the Issuer in a transaction that resulted in a change in the form of beneficial ownership from direct to indirect."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.57 to $24.56, inclusive."}],"balance_after":1994103,"source":{"system":"sec-edgar","filing":"0001517413-26-000240","document":"wk-form4_1787259658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000240/wk-form4_1787259658.xml","form_type":"4"}},{"id":679742,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-20T21:01:01.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":32387,"price":28.6,"value":926268.2,"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 $28.60 to $29.13, 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), (6), (7) and (8) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Amounts reflect the shift from direct to indirect ownership of 1,060 shares contributed by Mr. Bergman to the Per Artur Bergman Revocable Trust on March 2, 2026."}],"balance_after":2005191,"source":{"system":"sec-edgar","filing":"0001517413-26-000240","document":"wk-form4_1787259658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000240/wk-form4_1787259658.xml","form_type":"4"}},{"id":686531,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":23249,"kind":"person","name":"Loop Paula","position":1,"cik":"0001870529","reported_name":"Loop Paula","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-14T20:15:13.000Z","date":"2026-08-12","kind":"sale","planned":true,"acquired":false,"shares":7332,"price":30,"value":219960.0,"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 11, 2026."}],"balance_after":90443,"source":{"system":"sec-edgar","filing":"0001870529-26-000010","document":"wk-form4_1786738507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000187052926000010/wk-form4_1786738507.xml","form_type":"4"}},{"id":690426,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":24506,"kind":"person","name":"Daniels Richard Devon","position":1,"cik":"0001830164","reported_name":"Daniels Richard Devon","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-11T20:58:46.000Z","date":"2026-08-07","kind":"sale","planned":false,"acquired":false,"shares":11080,"price":22.901,"value":253743.08,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.900 to $22.905, 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 (1) to this Form 4."}],"balance_after":51197,"source":{"system":"sec-edgar","filing":"0001517413-26-000226","document":"wk-form4_1786481924.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000226/wk-form4_1786481924.xml","form_type":"4"}},{"id":694406,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-08-06T22:27:26.000Z","date":"2026-08-04","kind":"sale","planned":true,"acquired":false,"shares":14868,"price":25,"value":371700.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."}],"balance_after":1030592,"source":{"system":"sec-edgar","filing":"0001517413-26-000224","document":"wk-form4_1786055243.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000224/wk-form4_1786055243.xml","form_type":"4"}},{"id":705888,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-20T21:01:31.000Z","date":"2026-07-17","kind":"sale","planned":true,"acquired":false,"shares":155,"price":21.9,"value":3394.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."}],"balance_after":1045460,"source":{"system":"sec-edgar","filing":"0001517413-26-000203","document":"wk-form4_1784581289.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000203/wk-form4_1784581289.xml","form_type":"4"}},{"id":705887,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-20T21:01:31.000Z","date":"2026-07-17","kind":"sale","planned":true,"acquired":false,"shares":4204,"price":21.1,"value":88704.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $19.76 to $20.73, inclusive. 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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":1434494,"source":{"system":"sec-edgar","filing":"0001517413-26-000197","document":"wk-form4_1781816278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000197/wk-form4_1781816278.xml","form_type":"4"}},{"id":747556,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":40821,"kind":"person","name":"Hornik David","position":1,"cik":"0001547378","reported_name":"Hornik David","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-05T21:03:21.000Z","date":"2026-06-03","kind":"grant","planned":false,"acquired":true,"shares":9601,"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). 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The RSUs vest quarterly over one year following the date of grant and will be fully vested on the earlier of the date of the next annual meeting of the Issuer's stockholders (or the date immediately prior to the next annual meeting of the Issuer's stockholders if the reporting person's service as a director ends at such meeting due to the failure to be re-elected or not standing for re-election) and the one year anniversary measured from the date of grant, each subject to continued service as a director of the Issuer through each applicable vesting date."}],"balance_after":269431,"source":{"system":"sec-edgar","filing":"0001517413-26-000189","document":"wk-form4_1780693399.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000189/wk-form4_1780693399.xml","form_type":"4"}},{"id":747569,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":28679,"kind":"person","name":"Meyers Charles J","position":1,"cik":"0001502558","reported_name":"Meyers Charles J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-05T21:00:20.000Z","date":"2026-06-03","kind":"grant","planned":false,"acquired":true,"shares":9601,"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). 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The RSUs vest quarterly over one year following the date of grant and will be fully vested on the earlier of the date of the next annual meeting of the Issuer's stockholders (or the date immediately prior to the next annual meeting of the Issuer's stockholders if the reporting person's service as a director ends at such meeting due to the failure to be re-elected or not standing for re-election) and the one year anniversary measured from the date of grant, each subject to continued service as a director of the Issuer through each applicable vesting date."}],"balance_after":14828,"source":{"system":"sec-edgar","filing":"0001517413-26-000185","document":"wk-form4_1780693201.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1189229/000151741326000185/wk-form4_1780693201.xml","form_type":"4"}},{"id":748390,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-06-05T20:59:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":85,"price":21.85,"value":1857.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."}],"balance_after":1063945,"source":{"system":"sec-edgar","filing":"0001517413-26-000184","document":"wk-form4_1780693195.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000184/wk-form4_1780693195.xml","form_type":"4"}},{"id":748389,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-06-05T20:59:58.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":5746,"price":21.15,"value":121527.9,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $19.79 to $20.37, 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) and (3) to this Form 4."}],"balance_after":1069776,"source":{"system":"sec-edgar","filing":"0001517413-26-000184","document":"wk-form4_1780693195.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000184/wk-form4_1780693195.xml","form_type":"4"}},{"id":747555,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":40820,"kind":"person","name":"Smith Vanessa C.","position":1,"cik":"0001890818","reported_name":"Smith Vanessa C.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-05T20:59:52.000Z","date":"2026-06-03","kind":"grant","planned":false,"acquired":true,"shares":9601,"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. The RSUs vest quarterly over one year following the date of grant and will be fully vested on the earlier of the date of the next annual meeting of the Issuer's stockholders (or the date immediately prior to the next annual meeting of the Issuer's stockholders if the reporting person's service as a director ends at such meeting due to the failure to be re-elected or not standing for re-election) and the one year anniversary measured from the date of grant, each subject to continued service as a director of the Issuer through each applicable vesting date."}],"balance_after":98267,"source":{"system":"sec-edgar","filing":"0001517413-26-000183","document":"wk-form4_1780693189.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000183/wk-form4_1780693189.xml","form_type":"4"}},{"id":747554,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-05T20:59:44.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":100,"price":21.83,"value":2183.0,"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 June 3, 2025."},{"field":"shares","element":"transactionShares","label":"F2","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 7,889 shares of common stock of the Issuer in a transaction that resulted in a change in\nthe form of beneficial ownership from direct to indirect."}],"balance_after":2038638,"source":{"system":"sec-edgar","filing":"0001517413-26-000182","document":"wk-form4_1780693181.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741326000182/wk-form4_1780693181.xml","form_type":"4"}},{"id":747553,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":814,"kind":"person","name":"Bergman Artur","position":1,"cik":"0001769490","reported_name":"Bergman Artur","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-05T20:59:44.000Z","date":"2026-06-03","kind":"sale","planned":true,"acquired":false,"shares":6689,"price":21.13,"value":141338.57,"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 June 3, 2025."},{"field":"shares","element":"transactionShares","label":"F2","text":"The shares were sold by the Per Artur Bergman Revocable Trust, to which the reporting person contributed 7,889 shares of common stock of the Issuer in a transaction that resulted in a change in\nthe form of beneficial ownership from direct to indirect."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $19.49 to $20.16, inclusive. 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These shares were sold in multiple transactions at prices ranging from $24.06 to $24.94, 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 3 and 4 to this Form 4."}],"balance_after":1134295,"source":{"system":"sec-edgar","filing":"0001517413-26-000118","document":"wk-form4_1776719240.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000118/wk-form4_1776719240.xml","form_type":"4"}},{"id":804673,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-04-20T21:07:22.000Z","date":"2026-04-16","kind":"sale","planned":true,"acquired":false,"shares":11432,"price":23.69,"value":270824.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units."}],"balance_after":1140954,"source":{"system":"sec-edgar","filing":"0001517413-26-000118","document":"wk-form4_1776719240.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000118/wk-form4_1776719240.xml","form_type":"4"}},{"id":804672,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":813,"kind":"person","name":"Compton Charles Lacey III","position":1,"cik":"0002074428","reported_name":"Compton Charles Lacey III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2026-04-20T21:07:22.000Z","date":"2026-04-16","kind":"sale","planned":true,"acquired":false,"shares":11042,"price":25,"value":276050.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025."}],"balance_after":1152386,"source":{"system":"sec-edgar","filing":"0001517413-26-000118","document":"wk-form4_1776719240.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000118/wk-form4_1776719240.xml","form_type":"4"}},{"id":833726,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":815,"kind":"person","name":"Lovett Scott R.","position":1,"cik":"0002024441","reported_name":"Lovett Scott R.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Go to Market"}}],"security":"Class A Common Stock","published_at":"2026-03-19T20:30:20.000Z","date":"2026-03-18","kind":"sale","planned":true,"acquired":false,"shares":15800,"price":27.3,"value":431340.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on  February 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.11 to $27.56, inclusive."}],"balance_after":1503878,"source":{"system":"sec-edgar","filing":"0001517413-26-000114","document":"wk-form4_1773952217.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2024441/000151741326000114/wk-form4_1773952217.xml","form_type":"4"}}],"next_cursor":"2026-03-19T20:30:20.000000Z,833726"}