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These shares were sold in multiple transactions at prices ranging from $6.86 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 ranges set forth in footnote (2) to this Form 4."}],"balance_after":1544706,"source":{"system":"sec-edgar","filing":"0001517413-25-000076","document":"wk-form4_1740692335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741325000076/wk-form4_1740692335.xml","form_type":"4"}},{"id":1252402,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2025-02-21T22:16:55.000Z","date":"2025-02-19","kind":"sale","planned":false,"acquired":false,"shares":35509,"price":8.04,"value":285492.36,"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":1553301,"source":{"system":"sec-edgar","filing":"0001517413-25-000045","document":"wk-form4_1740176208.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741325000045/wk-form4_1740176208.xml","form_type":"4"}},{"id":1348928,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-11-27T21:10:48.000Z","date":"2024-11-25","kind":"sale","planned":false,"acquired":false,"shares":12163,"price":8.12,"value":98763.56,"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  performance-based Restricted Stock Units."}],"balance_after":1588810,"source":{"system":"sec-edgar","filing":"0001944844-24-000001","document":"wk-form4_1732741841.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000194484424000001/wk-form4_1732741841.xml","form_type":"4"}},{"id":1356968,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-11-20T22:16:35.000Z","date":"2024-11-18","kind":"sale","planned":false,"acquired":false,"shares":49816,"price":6.25,"value":311350.0,"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 $6.25 to $6.44. 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 footnote (2) to this Form 4."}],"balance_after":1600973,"source":{"system":"sec-edgar","filing":"0001517413-24-000232","document":"wk-form4_1732140989.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000232/wk-form4_1732140989.xml","form_type":"4"}},{"id":1421620,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-08-27T21:09:35.000Z","date":"2024-08-23","kind":"sale","planned":false,"acquired":false,"shares":12163,"price":6.25,"value":76018.75,"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  performance-based Restricted Stock Units."}],"balance_after":1650789,"source":{"system":"sec-edgar","filing":"0001517413-24-000194","document":"wk-form4_1724792969.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000194/wk-form4_1724792969.xml","form_type":"4"}},{"id":1427385,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-08-20T22:18:02.000Z","date":"2024-08-16","kind":"sale","planned":false,"acquired":false,"shares":66066,"price":6.18,"value":408287.88,"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."},{"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 $6.18 to $6.24. 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 footnote (2) to this Form 4."}],"balance_after":1662952,"source":{"system":"sec-edgar","filing":"0001517413-24-000189","document":"wk-form4_1724192277.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000189/wk-form4_1724192277.xml","form_type":"4"}},{"id":1500012,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-05-28T21:33:07.000Z","date":"2024-05-23","kind":"sale","planned":false,"acquired":false,"shares":12163,"price":8.92,"value":108493.96,"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 performance-based Restricted Stock Units."}],"balance_after":1729018,"source":{"system":"sec-edgar","filing":"0001517413-24-000127","document":"wk-form4_1716931979.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000127/wk-form4_1716931979.xml","form_type":"4"}},{"id":1508636,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-05-20T21:12:29.000Z","date":"2024-05-16","kind":"sale","planned":false,"acquired":false,"shares":65447,"price":8.84,"value":578551.48,"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."}],"balance_after":1741181,"source":{"system":"sec-edgar","filing":"0001517413-24-000119","document":"wk-form4_1716239525.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000119/wk-form4_1716239525.xml","form_type":"4"}},{"id":1567653,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-03-19T21:17:39.000Z","date":"2024-03-15","kind":"grant","planned":false,"acquired":true,"shares":198807,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting. One-sixteenth (6.25%) of the total RSUs will vest on May 15, 2024 and the remainder will vest in 15 equal quarterly installments (August, November, February and May) of one-sixteenth thereafter (6.25% 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":1806628,"source":{"system":"sec-edgar","filing":"0001517413-24-000083","document":"wk-form4_1710883017.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000083/wk-form4_1710883017.xml","form_type":"4"}},{"id":1614716,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-02-27T22:42:57.000Z","date":"2024-02-26","kind":"sale","planned":false,"acquired":false,"shares":48640,"price":13.93,"value":677555.2,"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 $13.93 to $13.97. 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 this footnote 2 to this Form 4."}],"balance_after":1607821,"source":{"system":"sec-edgar","filing":"0001517413-24-000073","document":"wk-form4_1709073765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000073/wk-form4_1709073765.xml","form_type":"4"}},{"id":1618811,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-02-27T00:31:08.000Z","date":"2024-02-22","kind":"grant","planned":false,"acquired":true,"shares":71278,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","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 2023. 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 22, August 22, November 22, and February 22, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":1656461,"source":{"system":"sec-edgar","filing":"0001517413-24-000069","document":"wk-form4_1708993857.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000069/wk-form4_1708993857.xml","form_type":"4"}},{"id":1618810,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-02-27T00:31:08.000Z","date":"2024-02-22","kind":"grant","planned":false,"acquired":true,"shares":213835,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","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 2023. 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 22, August 22, November 22, and February 22, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":1585183,"source":{"system":"sec-edgar","filing":"0001517413-24-000069","document":"wk-form4_1708993857.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000069/wk-form4_1708993857.xml","form_type":"4"}},{"id":1628265,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2024-02-21T22:03:24.000Z","date":"2024-02-16","kind":"sale","planned":false,"acquired":false,"shares":50708,"price":16.09,"value":815891.72,"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 $15.92 to $16.09. 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 this footnote 2 to this Form 4."}],"balance_after":1371348,"source":{"system":"sec-edgar","filing":"0001517413-24-000042","document":"wk-form4_1708552987.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741324000042/wk-form4_1708552987.xml","form_type":"4"}},{"id":1736127,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Performance rights","published_at":"2023-11-17T22:07:01.000Z","date":"2023-11-15","kind":"exercise","planned":false,"acquired":false,"shares":326086,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Reflects the conversion of previously granted performance-based restricted stock units (PRSUs). Each PRSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. 326,086 of the 1,304,347 PRSUs vested based on the achievement of a performance condition (Issuer's Class A Common Stock achieving a sixty-day consecutive trailing average closing price of $17.25 per share)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"One fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $17.25 per share (with the earliest such vesting date being the first quarterly vesting date after the first anniversary of September 6, 2022, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $23.00 per share (with the earliest such vesting date being the first quarterly vesting date after the  second anniversary of September 6, 2022, including if the performance condition is satisfied before such date);"},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $34.50 per share (with the earliest such vesting date being the first quarterly vesting date after the third anniversary of September 6, 2022, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $46.00 per share (with the earliest such vesting date being the first quarterly vesting date after the fourth anniversary of September 6, 2022, including if the performance condition is satisfied before such date). Any unvested tranche will be forfeited if the applicable market price is not achieved on or before September 6, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"One fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $17.25 per share (with the earliest such vesting date being the first quarterly vesting date after the first anniversary of September 6, 2022, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $23.00 per share (with the earliest such vesting date being the first quarterly vesting date after the  second anniversary of September 6, 2022, including if the performance condition is satisfied before such date);"},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $34.50 per share (with the earliest such vesting date being the first quarterly vesting date after the third anniversary of September 6, 2022, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $46.00 per share (with the earliest such vesting date being the first quarterly vesting date after the fourth anniversary of September 6, 2022, including if the performance condition is satisfied before such date). Any unvested tranche will be forfeited if the applicable market price is not achieved on or before September 6, 2027."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Represents the maximum number of shares remaining that may be issued pursuant to the PRSUs."}],"balance_after":978261,"derivative":{"underlying":"Class A Common Stock","underlying_shares":326086},"source":{"system":"sec-edgar","filing":"0001517413-23-000337","document":"wk-form4_1700258812.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000337/wk-form4_1700258812.xml","form_type":"4"}},{"id":1736126,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-11-17T22:07:01.000Z","date":"2023-11-16","kind":"sale","planned":false,"acquired":false,"shares":233270,"price":16.24,"value":3788304.8,"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 and PRSUs."},{"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 $16.12 to $16.31. 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 footnote (3) to this Form 4."}],"balance_after":1422056,"source":{"system":"sec-edgar","filing":"0001517413-23-000337","document":"wk-form4_1700258812.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000337/wk-form4_1700258812.xml","form_type":"4"}},{"id":1736125,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-11-17T22:07:01.000Z","date":"2023-11-15","kind":"exercise","planned":false,"acquired":true,"shares":326086,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Reflects the conversion of previously granted performance-based restricted stock units (PRSUs). Each PRSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. 326,086 of the 1,304,347 PRSUs vested based on the achievement of a performance condition (Issuer's Class A Common Stock achieving a sixty-day consecutive trailing average closing price of $17.25 per share)."}],"balance_after":1655326,"source":{"system":"sec-edgar","filing":"0001517413-23-000337","document":"wk-form4_1700258812.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000337/wk-form4_1700258812.xml","form_type":"4"}},{"id":1754639,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-10-26T21:04:39.000Z","date":"2023-05-04","kind":"grant","planned":false,"acquired":true,"shares":72957,"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 RSU are initially subject to vesting. One-fourth (25%) of the total RSUs will vest on May 15, 2026 and the remainder will vest in three equal quarterly installments (August, November, and February) of one-fourth thereafter (25% 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Holdings as of the date hereof."}],"balance_after":1329240,"source":{"system":"sec-edgar","filing":"0001517413-23-000291","document":"wk-form4_1698354267.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000291/wk-form4_1698354267.xml","form_type":"4"}},{"id":1801643,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-08-18T21:53:32.000Z","date":"2023-08-16","kind":"sale","planned":false,"acquired":false,"shares":74553,"price":18.51,"value":1379976.03,"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 $18.36 to $18.51. 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 this footnote 2 to this Form 4."}],"balance_after":1256283,"source":{"system":"sec-edgar","filing":"0001517413-23-000242","document":"wk-form4_1692395604.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000242/wk-form4_1692395604.xml","form_type":"4"}},{"id":1879431,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-05-24T21:16:46.000Z","date":"2023-05-19","kind":"grant","planned":false,"acquired":true,"shares":2500,"price":7.14,"value":17850.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares acquired under the Fastly, Inc. 2019 Employee Stock Purchase Plan in a transaction exempt under Rule 16b-3(c)."}],"balance_after":1330836,"source":{"system":"sec-edgar","filing":"0001517413-23-000120","document":"wf-form4_168496299135880.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000120/wf-form4_168496299135880.xml","form_type":"4"}},{"id":1886536,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-05-18T21:08:23.000Z","date":"2023-05-16","kind":"sale","planned":false,"acquired":false,"shares":74084,"price":13.17,"value":975686.28,"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":1328336,"source":{"system":"sec-edgar","filing":"0001517413-23-000113","document":"wf-form4_168444406512498.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000113/wf-form4_168444406512498.xml","form_type":"4"}},{"id":1933778,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-03-31T23:02:38.000Z","date":"2023-03-29","kind":"grant","planned":false,"acquired":true,"shares":218871,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting. One-twelfth (8.33%) of the total RSUs will vest on May 15, 2023 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":1402420,"source":{"system":"sec-edgar","filing":"0001517413-23-000057","document":"wf-form4_168030374460264.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000057/wf-form4_168030374460264.xml","form_type":"4"}},{"id":2002949,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2023-02-21T22:25:13.000Z","date":"2023-02-16","kind":"sale","acquired":false,"shares":54481,"price":13.93,"value":758920.33,"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":1183549,"source":{"system":"sec-edgar","filing":"0001517413-23-000015","document":"wf-form4_167701829156593.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741323000015/wf-form4_167701829156593.xml","form_type":"4"}},{"id":2110025,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2022-11-18T22:37:51.000Z","date":"2022-11-16","kind":"sale","acquired":false,"shares":66317,"price":10.44,"value":692349.48,"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 $10.23 to $10.44. 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 footnote (2) to this Form 4."}],"balance_after":1238030,"source":{"system":"sec-edgar","filing":"0001517413-22-000163","document":"wf-form4_166881105399134.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741322000163/wf-form4_166881105399134.xml","form_type":"4"}},{"id":2165120,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Performance rights","published_at":"2022-09-06T22:14:51.000Z","date":"2022-09-06","kind":"grant","acquired":true,"shares":1304347,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"The shares are represented by performance-based restricted stock units (PRSUs). Each PRSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. One fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $17.25 per share (with the earliest such vesting date being the first quarterly vesting date after the first anniversary of the grant date, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $23.00 per share (with the earliest such vesting date being the first quarterly vesting date after the second anniversary of the grant date, including if the performance condition is satisfied before such date);"},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $34.50 per share (with the earliest such vesting date being the first quarterly vesting date after the third anniversary of the grant date, including if the performance condition is satisfied before such date);one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $46.00 per share (with the earliest such vesting date being the first quarterly vesting date after the fourth anniversary of the grant date, including if the performance condition is satisfied before such date). Any unvested tranche will be forfeited if the applicable market price is not achieved on or before September 6, 2027."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The shares are represented by performance-based restricted stock units (PRSUs). Each PRSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. One fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $17.25 per share (with the earliest such vesting date being the first quarterly vesting date after the first anniversary of the grant date, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $23.00 per share (with the earliest such vesting date being the first quarterly vesting date after the second anniversary of the grant date, including if the performance condition is satisfied before such date);"},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $34.50 per share (with the earliest such vesting date being the first quarterly vesting date after the third anniversary of the grant date, including if the performance condition is satisfied before such date);one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $46.00 per share (with the earliest such vesting date being the first quarterly vesting date after the fourth anniversary of the grant date, including if the performance condition is satisfied before such date). Any unvested tranche will be forfeited if the applicable market price is not achieved on or before September 6, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The shares are represented by performance-based restricted stock units (PRSUs). Each PRSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. One fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $17.25 per share (with the earliest such vesting date being the first quarterly vesting date after the first anniversary of the grant date, including if the performance condition is satisfied before such date); one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $23.00 per share (with the earliest such vesting date being the first quarterly vesting date after the second anniversary of the grant date, including if the performance condition is satisfied before such date);"},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $34.50 per share (with the earliest such vesting date being the first quarterly vesting date after the third anniversary of the grant date, including if the performance condition is satisfied before such date);one fourth of the PRSUs will vest upon the Issuer's Class A Common Stock achieving a market price of $46.00 per share (with the earliest such vesting date being the first quarterly vesting date after the fourth anniversary of the grant date, including if the performance condition is satisfied before such date). Any unvested tranche will be forfeited if the applicable market price is not achieved on or before September 6, 2027."}],"balance_after":1304347,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1304347},"source":{"system":"sec-edgar","filing":"0001517413-22-000141","document":"wf-form4_166250247600663.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741322000141/wf-form4_166250247600663.xml","form_type":"4"}},{"id":2165119,"issuer":{"id":785,"kind":"organization","name":"Fastly, Inc.","symbol":"FSLY"},"owners":[{"id":10386,"kind":"person","name":"Nightingale Todd","position":1,"cik":"0001944844","reported_name":"Nightingale Todd","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Class A Common Stock","published_at":"2022-09-06T22:14:51.000Z","date":"2022-09-06","kind":"grant","acquired":true,"shares":1304347,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting over a period of four years. 40% of the RSUs vest in four equal quarterly installments for one year, thereafter 30% of the RSUs vest in four equal quarterly installments for one year, thereafter 20% of the RSUs vest in four equal quarterly installments for one year, and thereafter the remaining 10% of the RSUs vest in four equal quarterly installments for one year, in each case subject to the Reporting Person's continued service with the Issuer through each applicable vesting date."}],"balance_after":1304347,"source":{"system":"sec-edgar","filing":"0001517413-22-000141","document":"wf-form4_166250247600663.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1517413/000151741322000141/wf-form4_166250247600663.xml","form_type":"4"}}]}