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 Q3 2023?

64 institutional investors reported ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share for Q3 2023. Use the holders table for investor-level position and value details.

CUSIP: 00509G209

Q3 2023 13F Holders as of 30 Sep 2023

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 43,186,479
Total 13F value: $179,213,677
Share change: +17,196,296
Put/Call ratio: 112%
SEC-reported price per share: $4.15
Number of holders: 64
Value change: +$71,103,757
Number of buys: 47
Number of sells: 21
Shares outstanding: 72,227,200

Security key

00509G209

Report period

Q3 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 Jun 2023

13F Lead comparable stake: 14% Showing 1-6 of 15 holder rows.

Quick read

RA CAPITAL MANAGEMENT, L.P. leads the comparable SEC ownership view at 14%.

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. 14%

Deep Track Capital, LP 5.4%

Sands Capital Alternatives, LLC 4.7%

Knollwood Investment Advisory, LLC 2.3%

Laurion Capital Management LP 1.7%

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	14%	$46,997,418 9,770,773 shares	—	30 Jun 2023
Deep Track Capital, LP	13F Company 13F	5.4%	$18,837,696 3,916,361 shares	—	30 Jun 2023
Sands Capital Alternatives, LLC	13F Company 13F	4.7%	$16,436,131 3,417,075 shares	—	30 Jun 2023
Knollwood Investment Advisory, LLC	13F Company 13F	2.3%	$8,073,633 1,678,510 shares	—	30 Jun 2023
Laurion Capital Management LP	13F Company 13F	1.7%	$5,803,496 1,206,548 shares	—	30 Jun 2023
MILLENNIUM MANAGEMENT LLC	13F Company 13F	1.6%	$5,512,347 1,146,018 shares	—	30 Jun 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 Q3 2023

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

Institutions

43,186,479

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 Q3 2023 vs Q2 2023 Across Filers

Q2 2023 holders

Q3 2023 holders

Holder diff

Investor	Q2 2023 Shares	Q3 2023 Shares	Share Diff	Share Chg %	Q2 2023 value	Q3 2023 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend