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 2021?

40 institutional investors reported ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share for Q3 2021. Use the holders table for investor-level position and value details.

CUSIP: 00509G209

Q3 2021 13F Holders as of 30 Sep 2021

Type / Class: Equity / Common Stock, $0.0001 par value per share
Shares outstanding: 72,227,200
Total 13F shares: 24,050,108
Share change: +20,633,033
Total reported value: $357,352,000
Price per share: $14.86
Number of holders: 40
Value change: +$306,574,000
Number of buys: 39

Quarterly Holders Quick Answers

What is CUSIP 00509G209?
CUSIP 00509G209 identifies ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share in SEC institutional holdings data.

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Explore More Reporting Periods

Jump to adjacent filing periods for faster comparison and easier crawl discovery.

Newer quarter: Q4 2021

Recent filing periods for CUSIP 00509G209:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Top shareholders 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. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Sands Capital Ventures Discovery Fund III, L.P.	3/4/5	10%+ Owner	— class O/S missing	3,417,075	$11,859,300	—	06 Jul 2021	3/4/5
Paul B. Manning	3/4/5	10%+ Owner	— class O/S missing	657,985	$2,283,603	—	06 Jul 2021	3/4/5
Robert D. Hardie	3/4/5	10%+ Owner	— class O/S missing	657,985	$2,283,603	—	06 Jul 2021	3/4/5

Institutional Holders of Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (ABOS) as of Q3 2021

As of 30 Sep 2021, Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (ABOS) was held by 40 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 24,050,108 shares. The largest 10 holders included RA CAPITAL MANAGEMENT, L.P., Sands Capital Ventures, LLC, BlackRock Inc., Rock Springs Capital Management LP, VANGUARD GROUP INC, FRANKLIN RESOURCES INC, JANUS HENDERSON GROUP PLC, Laurion Capital Management LP, GUARDIAN POINT CAPITAL, LP, and Woodline Partners LP. This page lists 40 institutional shareholders reporting positions in this security for the Q3 2021 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q3 2021 vs Q4 2025 Across Filers

Q4 2025 holders

Q3 2021 holders

Holder diff

-30

Investor	Q4 2025 Shares	Q3 2021 Shares	Share Diff	Share Chg %	Q4 2025 Value $	Q3 2021 Value $	Value Diff $	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.