RA CAPITAL MANAGEMENT, L.P. - 27 Mar 2025 SCHEDULE 13D/A Report for Acumen Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (ABOS)

Filing Manager: RA CAPITAL MANAGEMENT, L.P.
Reporting Manager: RA Capital Management, L.P.
Security: Acumen Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share
Symbol: ABOS
Shares outstanding: 60,548,641 shares
Disclosed Ownership: 15,016,063 shares
Ownership: 25%
Form type: SCHEDULE 13D/A
Filing time: 31 Mar 2025, 16:57:22 UTC
Date of event: 27 Mar 2025
SEC: View on sec.gov

Reporting Managers (4)

Name	Ownership	Shares Owned	shared voting power	Signature	Title	CIK
RA Capital Management, L.P.	25%	15,016,063	15,016,063	/s/ Peter Kolchinsky	By Peter Kolchinsky, Authorized Signatory	0001346824
Peter Kolchinsky	25%	15,016,063	15,016,063	/s/ Peter Kolchinsky	Peter Kolchinsky	0001384859
Rajeev Shah	25%	15,016,063	15,016,063	/s/ Rajeev Shah	Rajeev Shah	0001619841
RA Capital Healthcare Fund, L.P.	22%	13,043,179	13,043,179	/s/ Peter Kolchinsky	By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager	0001315082