{"transactions":[{"id":934411,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Employee Stock Option (right to buy)","published_at":"2026-01-21T18:29:25.000Z","date":"2026-01-16","kind":"grant","planned":false,"acquired":true,"shares":250300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The shares subject to the option will vest in 48 equal monthly installments such that the option is fully vested on the fourth anniversary of the date of grant, subject to the Reporting Person's continuous service through each such vesting date."}],"balance_after":250300,"derivative":{"exercise_price":1.89,"expiration_date":"2036-01-16","underlying":"Common Stock","underlying_shares":250300},"source":{"system":"sec-edgar","filing":"0001628280-26-002956","document":"wk-form4_1769038162.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000162828026002956/wk-form4_1769038162.xml","form_type":"4"}},{"id":934410,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Common Stock","published_at":"2026-01-21T18:29:25.000Z","date":"2026-01-16","kind":"grant","planned":false,"acquired":true,"shares":166867,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") award. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs will vest in three equal annual installments commencing one year after the grant date, subject to the Reporting Person's continuous service through each such vesting date."}],"balance_after":220900,"source":{"system":"sec-edgar","filing":"0001628280-26-002956","document":"wk-form4_1769038162.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000162828026002956/wk-form4_1769038162.xml","form_type":"4"}},{"id":942399,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Common Stock","published_at":"2026-01-09T16:39:25.000Z","date":"2026-01-08","kind":"sale","planned":false,"acquired":false,"shares":6467,"price":1.8198,"value":11768.6466,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares sold by the Reporting Person through an automatic \"sell to cover\" transaction to satisfy tax withholding obligations in connection with the vesting of restricted stock units (\"RSUs\") pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 30, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $1.7200 to $1.9500. Upon request, the Reporting Person will provide to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":54033,"source":{"system":"sec-edgar","filing":"0001628280-26-001636","document":"wk-form4_1767994762.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000162828026001636/wk-form4_1767994762.xml","form_type":"4"}},{"id":942398,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Common Stock","published_at":"2026-01-09T16:39:25.000Z","date":"2026-01-07","kind":"sale","planned":false,"acquired":false,"shares":1700,"price":1.9879,"value":3379.43,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares sold by the Reporting Person through an automatic \"sell to cover\" transaction to satisfy tax withholding obligations in connection with the vesting of restricted stock units (\"RSUs\") pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 30, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $1.9550 to $2.0200. Upon request, the Reporting Person will provide to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Number of securities reported as beneficially owned by Mr. Doherty following the reported transaction reflects the correction of a typographical error in the Form 4 report filed January 7, 2025, which overreported the number of RSUs granted to Mr. Doherty on January 6, 2025, by 400 shares."}],"balance_after":60500,"source":{"system":"sec-edgar","filing":"0001628280-26-001636","document":"wk-form4_1767994762.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000162828026001636/wk-form4_1767994762.xml","form_type":"4"}},{"id":1308407,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Employee Stock Option (right to buy)","published_at":"2025-01-07T20:00:48.000Z","date":"2025-01-06","kind":"grant","planned":false,"acquired":true,"shares":93300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The shares subject to the option will vest in 48 equal monthly installments such that the option is fully vested on the fourth anniversary of the date of grant, subject to the Reporting Person's continuous service through each such vesting date."}],"balance_after":93300,"derivative":{"exercise_price":1.85,"expiration_date":"2035-01-06","underlying":"Common Stock","underlying_shares":93300},"source":{"system":"sec-edgar","filing":"0001576885-25-000017","document":"wk-form4_1736298041.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000157688525000017/wk-form4_1736298041.xml","form_type":"4"}},{"id":1308406,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Common Stock","published_at":"2025-01-07T20:00:48.000Z","date":"2025-01-06","kind":"grant","planned":false,"acquired":true,"shares":62600,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") award. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs will vest in three equal annual installments commencing one year after the grant date, subject to the Reporting Person's continuous service through each such vesting date."}],"balance_after":62600,"source":{"system":"sec-edgar","filing":"0001576885-25-000017","document":"wk-form4_1736298041.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000157688525000017/wk-form4_1736298041.xml","form_type":"4"}},{"id":1664110,"issuer":{"id":6281,"kind":"organization","name":"Acumen Pharmaceuticals, Inc."},"owners":[{"id":69062,"kind":"person","name":"Doherty James J.","position":1,"cik":"0002009718","reported_name":"Doherty James J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CDO"}}],"security":"Employee Stock Option (right to buy)","published_at":"2024-02-01T17:02:07.000Z","date":"2024-02-01","kind":"grant","planned":false,"acquired":true,"shares":601000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent (25%) of the shares subject to the option shall vest and become exercisable on February 1, 2025, and one thirty-sixth (1/36th) of the remaining shares subject to the option shall vest and become exercisable each month thereafter, subject to Reporting Person continuing to provide service through each such date."}],"balance_after":601000,"derivative":{"exercise_price":3.11,"expiration_date":"2034-02-01","underlying":"Common Stock","underlying_shares":601000},"source":{"system":"sec-edgar","filing":"0001576885-24-000036","document":"wk-form4_1706824917.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2009718/000157688524000036/wk-form4_1706824917.xml","form_type":"4"}}]}