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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":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":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":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":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":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. These shares were sold in multiple transactions at prices ranging from $20.77 to $21.76, inclusive."}],"balance_after":1045615,"source":{"system":"sec-edgar","filing":"0001517413-26-000203","document":"wk-form4_1784581289.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000203/wk-form4_1784581289.xml","form_type":"4"}},{"id":705886,"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":2714,"price":20.51,"value":55664.14,"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":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.76 to $20.73, 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":1049819,"source":{"system":"sec-edgar","filing":"0001517413-26-000203","document":"wk-form4_1784581289.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000203/wk-form4_1784581289.xml","form_type":"4"}},{"id":705885,"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":"2026-07-16","kind":"sale","planned":true,"acquired":false,"shares":11412,"price":20.65,"value":235657.8,"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":1052533,"source":{"system":"sec-edgar","filing":"0001517413-26-000203","document":"wk-form4_1784581289.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000203/wk-form4_1784581289.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":755380,"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":"2026-06-02T20:41:19.000Z","date":"2026-05-29","kind":"sale","planned":false,"acquired":false,"shares":15028,"price":16.96,"value":254874.88,"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":1073258,"source":{"system":"sec-edgar","filing":"0001517413-26-000167","document":"wk-form4_1780432876.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000167/wk-form4_1780432876.xml","form_type":"4"}},{"id":770323,"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":"2026-05-20T22:00:18.000Z","date":"2026-05-19","kind":"sale","planned":true,"acquired":false,"shares":11275,"price":16.48,"value":185812.0,"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":"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 $16.65 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 ranges set forth in footnotes (2) and (4) to this Form 4."}],"balance_after":1099561,"source":{"system":"sec-edgar","filing":"0001517413-26-000148","document":"wk-form4_1779314415.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000148/wk-form4_1779314415.xml","form_type":"4"}},{"id":804675,"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":"2026-04-17","kind":"sale","planned":true,"acquired":false,"shares":400,"price":25.4,"value":10160.0,"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."},{"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 $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":844325,"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":"2026-03-13T20:18:33.000Z","date":"2026-03-11","kind":"sale","planned":true,"acquired":false,"shares":49350,"price":25,"value":1233750.0,"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":1163428,"source":{"system":"sec-edgar","filing":"0001517413-26-000109","document":"wk-form4_1773433109.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000109/wk-form4_1773433109.xml","form_type":"4"}},{"id":854018,"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":"2026-03-09T22:17:34.000Z","date":"2026-03-05","kind":"sale","planned":true,"acquired":false,"shares":7400,"price":21.22,"value":157028.0,"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."},{"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 $20.09 to $21.08, 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":1220178,"source":{"system":"sec-edgar","filing":"0001517413-26-000101","document":"wk-form4_1773094652.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000101/wk-form4_1773094652.xml","form_type":"4"}},{"id":859083,"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":"2026-03-05T21:56:33.000Z","date":"2026-03-04","kind":"grant","planned":true,"acquired":true,"shares":373641,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","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":1249472,"source":{"system":"sec-edgar","filing":"0001517413-26-000094","document":"wk-form4_1772747791.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000094/wk-form4_1772747791.xml","form_type":"4"}},{"id":859082,"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":"2026-03-05T21:56:33.000Z","date":"2026-03-04","kind":"sale","planned":true,"acquired":false,"shares":59224,"price":21.06,"value":1247257.44,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units."}],"balance_after":875831,"source":{"system":"sec-edgar","filing":"0001517413-26-000094","document":"wk-form4_1772747791.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000094/wk-form4_1772747791.xml","form_type":"4"}},{"id":859081,"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":"2026-03-05T21:56:33.000Z","date":"2026-03-04","kind":"sale","planned":true,"acquired":false,"shares":1625,"price":21.01,"value":34141.25,"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."},{"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 $20.92 to $21.19, inclusive."}],"balance_after":935055,"source":{"system":"sec-edgar","filing":"0001517413-26-000094","document":"wk-form4_1772747791.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000094/wk-form4_1772747791.xml","form_type":"4"}},{"id":859080,"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":"2026-03-05T21:56:33.000Z","date":"2026-03-04","kind":"sale","planned":true,"acquired":false,"shares":12357,"price":20.33,"value":251217.81,"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":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.89 to $20.87, 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":936680,"source":{"system":"sec-edgar","filing":"0001517413-26-000094","document":"wk-form4_1772747791.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000094/wk-form4_1772747791.xml","form_type":"4"}},{"id":862406,"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":"2026-03-04T21:07:55.000Z","date":"2026-03-03","kind":"sale","planned":false,"acquired":false,"shares":13244,"price":20.3,"value":268853.2,"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 $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":949037,"source":{"system":"sec-edgar","filing":"0001517413-26-000086","document":"wk-form4_1772658473.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000086/wk-form4_1772658473.xml","form_type":"4"}},{"id":869144,"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":"2026-03-03T21:42:47.000Z","date":"2026-02-28","kind":"grant","planned":false,"acquired":true,"shares":263277,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the shares subject to performance-based restricted stock unit awards (PRSUs) earned based on the achievement of pre-established performance goals during the Issuer's fiscal year 2025. 33% of the number of PRSUs vested on the Transaction Date, and 8.375% of the PRSUs will vest in quarterly installments thereafter on May 28, August 28, November 28, and February 28, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":962281,"source":{"system":"sec-edgar","filing":"0001517413-26-000079","document":"wk-form4_1772574162.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000079/wk-form4_1772574162.xml","form_type":"4"}},{"id":869143,"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":"2026-03-03T21:42:47.000Z","date":"2026-02-28","kind":"grant","planned":false,"acquired":true,"shares":87259,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the shares subject to performance-based restricted stock unit awards (PRSUs) earned based on the achievement of pre-established performance goals during the Issuer's fiscal year 2025. 33% of the number of PRSUs vested on the Transaction Date, and 8.375% of the PRSUs will vest in quarterly installments thereafter on May 28, August 28, November 28, and February 28, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":699004,"source":{"system":"sec-edgar","filing":"0001517413-26-000079","document":"wk-form4_1772574162.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000079/wk-form4_1772574162.xml","form_type":"4"}},{"id":869142,"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":"2026-03-03T21:42:47.000Z","date":"2026-02-28","kind":"grant","planned":false,"acquired":true,"shares":27226,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Fully vested. 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These shares were sold in multiple transactions at prices ranging from $17.96 to $18.95, 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) to (4) to this Form 4."}],"balance_after":591219,"source":{"system":"sec-edgar","filing":"0001517413-26-000048","document":"wk-form4_1771883721.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000048/wk-form4_1771883721.xml","form_type":"4"}},{"id":891097,"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":"2026-02-20T21:34:28.000Z","date":"2026-02-18","kind":"sale","planned":false,"acquired":false,"shares":12916,"price":17.53,"value":226417.48,"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 $17.36 to $17.53. 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":599316,"source":{"system":"sec-edgar","filing":"0001517413-26-000042","document":"wk-form4_1771623264.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000042/wk-form4_1771623264.xml","form_type":"4"}},{"id":934441,"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":"2026-01-22T00:48:55.000Z","date":"2026-01-20","kind":"sale","planned":true,"acquired":false,"shares":4638,"price":8.81,"value":40860.78,"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 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 $8.75 to $8.93, inclusive."}],"balance_after":612232,"source":{"system":"sec-edgar","filing":"0001517413-26-000010","document":"wk-form4_1769042933.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000010/wk-form4_1769042933.xml","form_type":"4"}},{"id":934440,"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":"2026-01-22T00:48:55.000Z","date":"2026-01-16","kind":"sale","planned":true,"acquired":false,"shares":9044,"price":9.07,"value":82029.08,"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":"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 $9.07 to $9.08. 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 (4) to this Form 4."}],"balance_after":616870,"source":{"system":"sec-edgar","filing":"0001517413-26-000010","document":"wk-form4_1769042933.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741326000010/wk-form4_1769042933.xml","form_type":"4"}},{"id":985316,"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":"2025-12-01T21:11:04.000Z","date":"2025-11-26","kind":"sale","planned":true,"acquired":false,"shares":14944,"price":11.79,"value":176189.76,"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":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.43 to $12.25. 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":625914,"source":{"system":"sec-edgar","filing":"0001517413-25-000333","document":"wk-form4_1764623461.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000333/wk-form4_1764623461.xml","form_type":"4"}},{"id":992776,"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":"2025-11-20T21:59:36.000Z","date":"2025-11-18","kind":"sale","planned":false,"acquired":false,"shares":18455,"price":10.23,"value":188794.65,"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 $10.23 to $10.25. 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":640858,"source":{"system":"sec-edgar","filing":"0001517413-25-000319","document":"wk-form4_1763675972.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000319/wk-form4_1763675972.xml","form_type":"4"}},{"id":1015924,"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":"2025-10-20T20:56:19.000Z","date":"2025-10-16","kind":"sale","planned":false,"acquired":false,"shares":11378,"price":8.41,"value":95688.98,"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":659313,"source":{"system":"sec-edgar","filing":"0001517413-25-000280","document":"wk-form4_1760993777.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000280/wk-form4_1760993777.xml","form_type":"4"}},{"id":1046995,"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":"2025-09-05T21:13:30.000Z","date":"2025-09-03","kind":"sale","planned":false,"acquired":false,"shares":2954,"price":7.45,"value":22007.3,"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":670691,"source":{"system":"sec-edgar","filing":"0001517413-25-000258","document":"wk-form4_1757106807.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000258/wk-form4_1757106807.xml","form_type":"4"}},{"id":1060528,"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":"2025-08-20T21:48:21.000Z","date":"2025-08-18","kind":"sale","planned":false,"acquired":false,"shares":15335,"price":6.88,"value":105504.8,"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 $6.84 to $6.88. 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":673645,"source":{"system":"sec-edgar","filing":"0001517413-25-000238","document":"wk-form4_1755726497.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000238/wk-form4_1755726497.xml","form_type":"4"}},{"id":1068007,"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":"2025-08-13T21:18:20.000Z","date":"2025-08-10","kind":"grant","planned":false,"acquired":true,"shares":277777,"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-sixteenth (6.25%) of the total RSUs will vest on August 15, 2025 and the remainder will vest in 15 equal 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 2019 Plan) to the Company.\nProvided 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":688980,"source":{"system":"sec-edgar","filing":"0001517413-25-000224","document":"wk-form4_1755119896.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000224/wk-form4_1755119896.xml","form_type":"4"}},{"id":1084183,"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":"2025-07-21T20:25:49.000Z","date":"2025-07-17","kind":"sale","planned":true,"acquired":false,"shares":2183,"price":6.83,"value":14909.89,"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 plan adopted by the reporting person on May 30, 2024."}],"balance_after":411203,"source":{"system":"sec-edgar","filing":"0001517413-25-000193","document":"wk-form4_1753129544.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000193/wk-form4_1753129544.xml","form_type":"4"}},{"id":1085767,"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":"2025-07-17T20:16:48.000Z","date":"2025-07-16","kind":"sale","planned":false,"acquired":false,"shares":11379,"price":6.87,"value":78173.73,"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":413386,"source":{"system":"sec-edgar","filing":"0001517413-25-000191","document":"wk-form4_1752783402.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2074428/000151741325000191/wk-form4_1752783402.xml","form_type":"4"}}]}