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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1576885	Acumen Pharmaceuticals Inc.	ABOS	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1315082	Ra Capital Healthcare Fund Lp	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1346824	Ra Capital Management, L.p.	200 Berkeley Street 18Th Floor Boston MA 02116	Yes	No	Yes	No
1384859	Peter Kolchinsky	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1619841	M. Rajeev Shah	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1825376	Ra Capital Nexus Fund Ii, L.p.	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2023-07-21	5,161,290	$7.75	13,043,179	No	4	P	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnotes

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,300,034	Indirect	See Footnotes
Common Stock	588,850	Indirect	See Footnotes

Footnotes

Acquired from the Issuer pursuant to the public offering described in the Issuer's Prospectus filed with the Securities and Exchange Commission on July 20, 2023.
Held directly by RA Capital Healthcare Fund, L.P. (the "Fund").
RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund II, L.P. (the "Nexus Fund II") and a separately managed account (the "Account"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, Dr. Kolchinsky, and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
Held directly by the Nexus Fund II.
Held directly by the Account.