Who owns Acumen Pharmaceuticals, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ABOS from SEC Form 13F filings across 96 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 96 institutions disclosed 47.9M shares of Acumen Pharmaceuticals, Inc. worth $127.8M — about 66.2% of shares outstanding; the largest disclosed holder is RA CAPITAL MANAGEMENT, L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
96
13F holders
$127.8M
value, 2026 filers
66.2%
of shares outstanding (47.9M sh)
30
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ABOS's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 21.0M | $56.1M | 0.5% | 29.1% | 0.0% |
| 2 | Sands Capital Alternatives, LLC | 3.7M | $9.9M | 1.6% | 5.1% | 0.0% |
| 3 | BlackRock, Inc. | 2.5M | $6.6M | 0.0% | 3.4% | +1296.4% |
| 4 | Alyeska Investment Group, L.P. | 2.5M | $6.6M | 0.0% | 3.4% | 0.0% |
| 5 | FRANKLIN RESOURCES INC | 2.3M | $6.2M | 0.0% | 3.2% | 0.0% |
| 6 | ADAR1 Capital Management, LLC | 2.1M | $5.6M | 0.3% | 2.9% | -2.1% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | $4.5M | 0.0% | 2.3% | +11.0% |
| 8 | Knollwood Investment Advisory, LLC | 1.6M | $4.3M | 0.4% | 2.3% | 0.0% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $3.0M | 0.0% | 1.6% | +174.3% |
| 10 | Ikarian Capital, LLC | 1.1M | $2.8M | 0.3% | 1.5% | 0.0% |
| 11 | Hudson Bay Capital Management LP | 955,000 | $2.5M | 0.0% | 1.3% | -1.4% |
| 12 | Pathstone Holdings, LLC | 859,110 | $2.3M | 0.0% | 1.2% | 0.0% |
| 13 | RENAISSANCE TECHNOLOGIES LLC | 675,025 | $1.8M | 0.0% | 0.9% | +42.4% |
| 14 | TWO SIGMA INVESTMENTS, LP | 622,882 | $1.7M | 0.0% | 0.9% | +17.3% |
| 15 | STATE STREET CORP | 600,528 | $1.6M | 0.0% | 0.8% | +295.8% |
| 16 | NORTHERN TRUST CORP | 360,744 | $963,187 | 0.0% | 0.5% | +379.6% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT LLCNEW | 320,795 | $856,523 | 0.0% | 0.4% | new |
| 18 | DIMENSIONAL FUND ADVISORS LP | 291,559 | $778,969 | 0.0% | 0.4% | +143.5% |
| 19 | VANGUARD FIDUCIARY TRUST CO | 291,240 | $777,611 | 0.0% | 0.4% | +46.2% |
| 20 | BANK OF AMERICA CORP /DE/ | 274,781 | $733,665 | 0.0% | 0.4% | -14.2% |
| 21 | BOOTHBAY FUND MANAGEMENT, LLC | 273,012 | $728,942 | 0.0% | 0.4% | 0.0% |
| 22 | ACADIAN ASSET MANAGEMENT LLC | 270,338 | $718,000 | 0.0% | 0.4% | +45.5% |
| 23 | NOMURA HOLDINGS INCNEW | 189,712 | $506,531 | 0.0% | 0.3% | new |
| 24 | GOLDMAN SACHS GROUP INC | 183,927 | $491,085 | 0.0% | 0.3% | -11.0% |
| 25 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 176,171 | $470,377 | 0.0% | 0.2% | 0.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.