Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (ABOS)

Q: What does CUSIP 00509G209 represent in this 13F holders report?

CUSIP 00509G209 is the security identifier for ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share used to aggregate holder disclosures.

Q: How many institutions held ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share in Q4 2023?

67 institutional investors reported ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share for Q4 2023. Use the holders table for investor-level position and value details.

CUSIP: 00509G209

Q4 2023 13F Holders as of 31 Dec 2023

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 38,441,008
Total 13F value: $147,599,716
Share change: -4,768,433
Put/Call ratio: 122%
SEC-reported price per share: $3.84
Number of holders: 67
Value change: -$20,522,527
Number of buys: 45
Number of sells: 25
Shares outstanding: 72,227,200

Security key

00509G209

Report period

Q4 2023

Institutions

Top holders

ABOS full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Acumen Pharmaceuticals, Inc. SEC filings Acumen Pharmaceuticals, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 00509G209

Newer quarter: Q2 2026

Recent filing periods:

Q2 2026

Ownership snapshot

Top reported holders of ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

RA CAPITAL MANAGEMENT, L.P.

Disclosed value leader

RA CAPITAL MANAGEMENT, L.P.

Comparable rows

15/15

Latest evidence

30 Sep 2023

13F Lead comparable stake: 21% Showing 1-6 of 15 holder rows.

Quick read

RA CAPITAL MANAGEMENT, L.P. leads the comparable SEC ownership view at 21%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens RA CAPITAL MANAGEMENT, L.P.'s linked filing trail.

Comparable ownership Top 5

RA CAPITAL MANAGEMENT, L.P. 21%

Sands Capital Alternatives, LLC 4.7%

FRANKLIN RESOURCES INC 3.9%

Rock Springs Capital Management LP 3.9%

Deep Track Capital, LP 3.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
RA CAPITAL MANAGEMENT, L.P.	13F Company 13F	21%	$61,968,061 14,932,063 shares	—	30 Sep 2023
Sands Capital Alternatives, LLC	13F Company 13F	4.7%	$14,180,861 3,417,075 shares	—	30 Sep 2023
FRANKLIN RESOURCES INC	13F Company 13F	3.9%	$11,780,875 2,838,765 shares	—	30 Sep 2023
Rock Springs Capital Management LP	13F Company 13F	3.9%	$11,672,203 2,812,579 shares	—	30 Sep 2023
Deep Track Capital, LP	13F Company 13F	3.5%	$10,429,133 2,513,044 shares	—	30 Sep 2023
Boxer Capital, LLC	13F Company 13F	3.1%	$9,158,979 2,206,983 shares	—	30 Sep 2023

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2023

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

38,441,008

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q4 2023 vs Q3 2023 Across Filers

Q3 2023 holders

Q4 2023 holders

Holder diff

Investor	Q3 2023 Shares	Q4 2023 Shares	Share Diff	Share Chg %	Q3 2023 value	Q4 2023 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend