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The shares issued and reported here on Form 4, net of the minimum statutory tax liability, were issued to the reporting person in recognition of 10 years of continuous employment on September 19, 2026."}],"balance_after":95802,"source":{"system":"sec-edgar","filing":"0001178670-26-000065","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1446125/000117867026000065/form4.xml","form_type":"4"}},{"id":752712,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Stock Option  (Right to Buy)","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"exercise","planned":true,"acquired":false,"shares":3830,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"This stock option was fully vested and exercisable as of June 3, 2017."}],"balance_after":0,"derivative":{"exercise_price":70.2,"exercise_date":"2017-06-03","expiration_date":"2026-06-03","underlying":"Common Stock","underlying_shares":3830},"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752711,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":17,"price":302.65,"value":5145.05,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."}],"balance_after":1582,"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752710,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":495,"price":300.72,"value":148856.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $300.45 to $301.15. The reporting person will provide to the issuer, any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."}],"balance_after":1599,"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752709,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":1222,"price":299.87,"value":366441.14,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $299.36 to $300.19. The reporting person will provide to the issuer, any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."}],"balance_after":2094,"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752708,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":1175,"price":298.91,"value":351219.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $298.33 to $299.33. The reporting person will provide to the issuer, any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."}],"balance_after":3316,"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752707,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":921,"price":297.71,"value":274190.91,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  The options exercised by the reporting person were due to expire on June 3, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $297.31 to $297.99. The reporting person will provide to the issuer, any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range."}],"balance_after":4491,"source":{"system":"sec-edgar","filing":"0001178670-26-000048","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000048/form4.xml","form_type":"4"}},{"id":752706,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-06-03T20:25:20.000Z","date":"2026-06-01","kind":"exercise","planned":true,"acquired":true,"shares":3830,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1(c) trading plan adopted by the reporting person on November 12, 2025.  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The RSUs will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date."}],"balance_after":24049,"source":{"system":"sec-edgar","filing":"0001178670-26-000041","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000117867026000041/form4.xml","form_type":"4"}},{"id":766441,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":41112,"kind":"person","name":"Reitan Colleen F","position":1,"cik":"0001740730","reported_name":"Reitan Colleen F","relationship":{"director":true}}],"security":"Stock Option  (Right to Buy)","published_at":"2026-05-22T20:16:41.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":1441,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock option will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date."}],"balance_after":1441,"derivative":{"exercise_price":298.48,"exercise_date":"2027-05-20","expiration_date":"2036-05-20","underlying":"Common Stock","underlying_shares":1441},"source":{"system":"sec-edgar","filing":"0001178670-26-000040","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000117867026000040/form4.xml","form_type":"4"}},{"id":766440,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":41112,"kind":"person","name":"Reitan Colleen F","position":1,"cik":"0001740730","reported_name":"Reitan Colleen F","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-05-22T20:16:41.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":671,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares are represented by restricted stock units (RSUs) granted under the Second Amended and Restated 2018 Stock Incentive Plan. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date."}],"balance_after":1446,"source":{"system":"sec-edgar","filing":"0001178670-26-000040","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000117867026000040/form4.xml","form_type":"4"}},{"id":766595,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Stock Option  (Right to Buy)","published_at":"2026-05-22T20:14:57.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":1441,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock option will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date."}],"balance_after":1441,"derivative":{"exercise_price":298.48,"exercise_date":"2027-05-20","expiration_date":"2036-05-20","underlying":"Common Stock","underlying_shares":1441},"source":{"system":"sec-edgar","filing":"0001178670-26-000039","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1051578/000117867026000039/form4.xml","form_type":"4"}},{"id":766594,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":34936,"kind":"person","name":"PYOTT DAVID E I","position":1,"cik":"0001051578","reported_name":"PYOTT DAVID E I","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-05-22T20:14:57.000Z","date":"2026-05-20","kind":"grant","planned":false,"acquired":true,"shares":671,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares are represented by restricted stock units (RSUs) granted under the Second Amended and Restated 2018 Stock Incentive Plan. Each RSU represents a contingent right to receive one share of common stock. 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