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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":856431,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":265,"price":325.67,"value":86302.55,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $325.40 to $326.21. 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":95695,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856430,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":345,"price":324.88,"value":112083.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $324.39 to $325.38. 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":95960,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856429,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":973,"price":323.84,"value":315096.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $323.38 to $324.35. 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":96305,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856428,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":444,"price":323.01,"value":143416.44,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $322.36 to $323.36. 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":97278,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856427,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":368,"price":321.82,"value":118429.76,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"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 $321.34 to $322.31. 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":97722,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856426,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":274,"price":320.81,"value":87901.94,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"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 $320.33 to $321.33. 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":98090,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856425,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":129,"price":320.01,"value":41281.29,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"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 $319.28 to $320.28. 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":98364,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":856424,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-06T21:13:11.000Z","date":"2026-03-04","kind":"sale","planned":false,"acquired":false,"shares":135,"price":319.03,"value":43069.05,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations upon the vesting of restricted stock units."},{"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 $318.27 to $319.27. 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":98493,"source":{"system":"sec-edgar","filing":"0001735276-26-000062","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000062/edgardoc.xml","form_type":"4"}},{"id":862443,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Price Performance Stock Unit","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":110746,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F15","text":"Stock price performance unit award (PSU) granted pursuant to the Second Amended and Restated 2018 Stock Incentive Plan.  The amount reported is the maximum number of PSUs that may be earned upon achievement of pre-set stock price thresholds.  Subject to the terms and conditions of the PSU award agreement, the PSU vests on December 31, 2029 (Vesting Date) and between 50% and 200% of the target number of 55,373 PSUs may be earned if the highest average closing price that is achieved over a 30 consecutive trading period (Future Average Stock Price) in the six months preceding the vesting date (Measurement Period) meets or exceeds certain thresholds.  If the Future Average Stock Price does not meet or exceed the baseline threshold price during the Measurement Period, no portion of the PSU will be earned, and all PSUs will be forfeited on the Vesting Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F15","text":"Stock price performance unit award (PSU) granted pursuant to the Second Amended and Restated 2018 Stock Incentive Plan.  The amount reported is the maximum number of PSUs that may be earned upon achievement of pre-set stock price thresholds.  Subject to the terms and conditions of the PSU award agreement, the PSU vests on December 31, 2029 (Vesting Date) and between 50% and 200% of the target number of 55,373 PSUs may be earned if the highest average closing price that is achieved over a 30 consecutive trading period (Future Average Stock Price) in the six months preceding the vesting date (Measurement Period) meets or exceeds certain thresholds.  If the Future Average Stock Price does not meet or exceed the baseline threshold price during the Measurement Period, no portion of the PSU will be earned, and all PSUs will be forfeited on the Vesting Date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F15","text":"Stock price performance unit award (PSU) granted pursuant to the Second Amended and Restated 2018 Stock Incentive Plan.  The amount reported is the maximum number of PSUs that may be earned upon achievement of pre-set stock price thresholds.  Subject to the terms and conditions of the PSU award agreement, the PSU vests on December 31, 2029 (Vesting Date) and between 50% and 200% of the target number of 55,373 PSUs may be earned if the highest average closing price that is achieved over a 30 consecutive trading period (Future Average Stock Price) in the six months preceding the vesting date (Measurement Period) meets or exceeds certain thresholds.  If the Future Average Stock Price does not meet or exceed the baseline threshold price during the Measurement Period, no portion of the PSU will be earned, and all PSUs will be forfeited on the Vesting Date."}],"balance_after":110746,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":110746},"source":{"system":"sec-edgar","filing":"0001735276-26-000048","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000048/edgardoc.xml","form_type":"4"}},{"id":862442,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Option  (right to buy)","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"grant","planned":false,"acquired":true,"shares":30425,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F14","text":"The stock option vests as to 25% of the shares on the first anniversary of the grant date and the remaining shares vest in equal installments at the end of each successive three-month period thereafter until the fourth anniversary of the grant date, subject to the Reporting Persons continuous service with the Issuer as of each such vesting date."}],"balance_after":30425,"derivative":{"exercise_price":325.07,"expiration_date":"2036-03-02","underlying":"Common Stock","underlying_shares":30425},"source":{"system":"sec-edgar","filing":"0001735276-26-000048","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000048/edgardoc.xml","form_type":"4"}},{"id":862441,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":160,"price":332.64,"value":53222.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $332.34 to $332.24. 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":98628,"source":{"system":"sec-edgar","filing":"0001735276-26-000048","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000048/edgardoc.xml","form_type":"4"}},{"id":862440,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":399,"price":331.93,"value":132440.07,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $331.32 to $332.31. 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":98788,"source":{"system":"sec-edgar","filing":"0001735276-26-000048","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000048/edgardoc.xml","form_type":"4"}},{"id":862439,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":346,"price":330.85,"value":114474.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $330.30 to $331.30. 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":99187,"source":{"system":"sec-edgar","filing":"0001735276-26-000048","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000048/edgardoc.xml","form_type":"4"}},{"id":862438,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-05T00:29:11.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":722,"price":329.71,"value":238050.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $329.29 to $330.29. 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On February 27, 2026, the third and final tranche of restricted stock units from the February 27, 2023 grant vested and was released, as reported on this Form 4."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The restricted stock units vest ratably in three installments, with one third vesting on each of the first, second and third anniversaries of the grant date."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":5921},"source":{"system":"sec-edgar","filing":"0001735276-26-000041","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000041/edgardoc.xml","form_type":"4"}},{"id":874877,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-02T21:10:11.000Z","date":"2026-02-27","kind":"exercise","planned":false,"acquired":true,"shares":5921,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":91583,"source":{"system":"sec-edgar","filing":"0001735276-26-000041","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000041/edgardoc.xml","form_type":"4"}},{"id":901560,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-18T00:27:57.000Z","date":"2026-02-13","kind":"sale","planned":false,"acquired":false,"shares":6958,"price":310.0808,"value":2157542.2064,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"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 $302.55 to $314.60. 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The shares reported were issued to the reporting person upon vesting of forty (40) percent of the shares subject to the PSU based on the issuer publicly reporting the achievement of non-GAAP operating income for fiscal year 2025 on February 12, 2026, as determined by the People, Culture and Compensation Committee of the Issuer Board of Directors."}],"balance_after":92620,"source":{"system":"sec-edgar","filing":"0001735276-26-000028","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000028/edgardoc.xml","form_type":"4"}},{"id":939458,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-01-14T21:23:05.000Z","date":"2026-01-12","kind":"sale","planned":false,"acquired":false,"shares":94,"price":377.82,"value":35515.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."}],"balance_after":78411,"source":{"system":"sec-edgar","filing":"0001735276-26-000014","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":22,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000014/edgardoc.xml","form_type":"4"}},{"id":939457,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-01-14T21:23:05.000Z","date":"2026-01-12","kind":"sale","planned":false,"acquired":false,"shares":118,"price":375.65,"value":44326.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."}],"balance_after":78505,"source":{"system":"sec-edgar","filing":"0001735276-26-000014","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":21,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527626000014/edgardoc.xml","form_type":"4"}},{"id":939456,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-01-14T21:23:05.000Z","date":"2026-01-12","kind":"sale","planned":false,"acquired":false,"shares":88,"price":374.44,"value":32950.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents shares automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement to cover minimum statutory tax withholding obligations."},{"field":"price","element":"transactionPricePerShare","label":"F21","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $374.08 to $374.89. 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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":74755,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999135,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-13","kind":"exercise","planned":true,"acquired":true,"shares":10000,"price":119.13,"value":1191300.0,"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 August 13, 2025."}],"balance_after":75409,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999134,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":430,"price":458.42,"value":197120.6,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $458.37 to $458.56. 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":65409,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999133,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":604,"price":457.71,"value":276456.84,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $457.24 to $458.06. 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":65839,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999132,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":2420,"price":456.64,"value":1105068.8,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $456.22 to $457.19. 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":66443,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999131,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":3406,"price":455.56,"value":1551637.36,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $455.17 to $456.15. 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":68863,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999130,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":1960,"price":454.84,"value":891486.4,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $454.16 to $455.16. 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":72269,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999129,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":1069,"price":453.52,"value":484812.88,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $453.14 to $454.11. 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":74229,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999128,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":1210,"price":452.43,"value":547440.3,"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 August 13, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported represents the weighted average sales price of shares sold in multiple transactions at prices ranging from $451.95 to $452.89. 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":75298,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999127,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":1255,"price":451.16,"value":566205.8,"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 August 13, 2025."},{"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 $450.75 to $451.55. 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":76508,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999126,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":453,"price":450.17,"value":203927.01,"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 August 13, 2025."},{"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 $449.72 to $450.64. 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":77763,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999125,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":2132,"price":449.15,"value":957587.8,"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 August 13, 2025."},{"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 $448.69 to $449.69. 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":78216,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999124,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2025-11-14T21:13:41.000Z","date":"2025-11-12","kind":"sale","planned":true,"acquired":false,"shares":711,"price":448.07,"value":318577.77,"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 August 13, 2025."},{"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 $447.67 to $448.67. 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":80348,"source":{"system":"sec-edgar","filing":"0001735276-25-000120","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000120/edgardoc.xml","form_type":"4"}},{"id":999123,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet Yvonne","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common 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automatically sold by the Company on behalf of the reporting person pursuant to a mandatory sell-to-cover provision in the award agreement required to cover minimum statutory tax withholding obligations that became due upon the vesting and settlement of tranches of PSUs granted to the reporting person on February 24, 2021 and March 1, 2024."}],"balance_after":65418,"source":{"system":"sec-edgar","filing":"0001735276-25-000116","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1178670/000173527625000116/edgardoc.xml","form_type":"4"}},{"id":1025174,"issuer":{"id":3132,"kind":"organization","name":"ALNYLAM PHARMACEUTICALS, INC.","symbol":"ALNY"},"owners":[{"id":62340,"kind":"person","name":"Greenstreet Yvonne","position":1,"cik":"0001446125","reported_name":"Greenstreet 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