ABOS Acumen Pharmaceuticals, Inc.
Acumen Pharmaceuticals, Inc. (ABOS) Institutional Ownership
What the institutions did with ABOS last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 21.0M | 43.9% |
| Sands Capital Alternatives, LLC | 3.7M | 7.8% |
| BlackRock, Inc. | 2.5M | 5.2% |
| Alyeska Investment Group, L.P. | 2.5M | 5.1% |
| FRANKLIN RESOURCES INC | 2.3M | 4.8% |
| ADAR1 Capital Management, LLC | 2.1M | 4.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | 3.5% |
| Knollwood Investment Advisory, LLC | 1.6M | 3.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1M | 2.4% |
| Ikarian Capital, LLC | 1.1M | 2.2% |
| Hudson Bay Capital Management LP | 955.0K | 2.0% |
| Pathstone Holdings, LLC | 859.1K | 1.8% |
| RENAISSANCE TECHNOLOGIES LLC | 675.0K | 1.4% |
| TWO SIGMA INVESTMENTS, LP | 622.9K | 1.3% |
| STATE STREET CORP | 600.5K | 1.3% |
| NORTHERN TRUST CORP | 360.7K | 0.8% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 320.8K | 0.7% |
| DIMENSIONAL FUND ADVISORS LP | 291.6K | 0.6% |
| VANGUARD FIDUCIARY TRUST CO | 291.2K | 0.6% |
| BANK OF AMERICA CORP /DE/ | 274.8K | 0.6% |
| BOOTHBAY FUND MANAGEMENT, LLC | 273.0K | 0.6% |
| ACADIAN ASSET MANAGEMENT LLC | 270.3K | 0.6% |
| NOMURA HOLDINGS INC | 189.7K | 0.4% |
| GOLDMAN SACHS GROUP INC | 183.9K | 0.4% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 176.2K | 0.4% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BlackRock, Inc. | Increased | 178.3K | 2.5M | +2.3M |
| FMR LLC | Reduced | 1.2M | 7.5K | -1.1M |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 416.2K | 1.1M | +725.6K |
| SG Americas Securities, LLC | Sold Out | 719.3K | 0 | -719.3K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 659.7K | 60.6K | -599.1K |
| Laurion Capital Management LP | Sold Out | 525.4K | 0 | -525.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | 601.5K | 126.1K | -475.4K |
| STATE STREET CORP | Increased | 151.7K | 600.5K | +448.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New | 0 | 320.8K | +320.8K |
| NORTHERN TRUST CORP | Increased | 75.2K | 360.7K | +285.5K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 473.9K | 675.0K | +201.1K |
| NOMURA HOLDINGS INC | New | 0 | 189.7K | +189.7K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 119.8K | 291.6K | +171.8K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.5M | 1.7M | +165.8K |
| MARSHALL WACE, LLP | Reduced | 192.9K | 48.1K | -144.8K |
| Bank of New York Mellon Corp | New | 0 | 124.4K | +124.4K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | New | 0 | 115.1K | +115.1K |
| TWO SIGMA INVESTMENTS, LP | Increased | 530.8K | 622.9K | +92.1K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 199.2K | 291.2K | +92.0K |
| JANE STREET GROUP, LLC | Sold Out | 89.7K | 0 | -89.7K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 185.9K | 270.3K | +84.5K |
| Qube Research & Technologies Ltd | Reduced | 120.4K | 38.6K | -81.8K |
| Point72 Asset Management, L.P. | Sold Out | 67.4K | 0 | -67.4K |
| Nuveen, LLC | New | 0 | 63.4K | +63.4K |
| CITADEL ADVISORS LLC | New | 0 | 51.0K | +51.0K |
| DEUTSCHE BANK AG\ | New | 0 | 46.1K | +46.1K |
| Catalyst Funds Management Pty Ltd | Sold Out | 45.6K | 0 | -45.6K |
| BANK OF AMERICA CORP /DE/ | Reduced | 320.2K | 274.8K | -45.4K |
| ADAR1 Capital Management, LLC | Reduced | 2.2M | 2.1M | -45.0K |
| WELLS FARGO & COMPANY/MN | Increased | 10.1K | 49.7K | +39.6K |
| PRICE T ROWE ASSOCIATES INC /MD/ | New | 0 | 39.3K | +39.3K |
| Squarepoint Ops LLC | Increased | 15.0K | 52.4K | +37.3K |
| NEW YORK STATE COMMON RETIREMENT FUND | New | 0 | 36.2K | +36.2K |
| RHUMBLINE ADVISERS | New | 0 | 35.0K | +35.0K |
| XTX Topco Ltd | New | 0 | 32.1K | +32.1K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 29.5K | +29.5K |
| OMERS ADMINISTRATION Corp | Sold Out | 28.6K | 0 | -28.6K |
| Quantinno Capital Management LP | New | 0 | 26.8K | +26.8K |
| Invesco Ltd. | New | 0 | 24.6K | +24.6K |
| GOLDMAN SACHS GROUP INC | Reduced | 206.7K | 183.9K | -22.8K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | New | 0 | 21.8K | +21.8K |
| Police & Firemen's Retirement System of New Jersey | New | 0 | 19.4K | +19.4K |
| JPMORGAN CHASE & CO | Increased | 1.4K | 20.2K | +18.7K |
| SIMPLEX TRADING, LLC | Sold Out | 17.4K | 0 | -17.4K |
| CITIGROUP INC | Increased | 4.5K | 21.9K | +17.4K |
| CAPTRUST FINANCIAL ADVISORS | Sold Out | 15.8K | 0 | -15.8K |
| Brevan Howard Capital Management LP | Sold Out | 15.4K | 0 | -15.4K |
| Spark Investment Management LLC | New | 0 | 14.7K | +14.7K |
| Hudson Bay Capital Management LP | Reduced | 968.9K | 955.0K | -13.9K |
| PFG Investments, LLC | Increased | 80.9K | 94.3K | +13.4K |
| HRT FINANCIAL LP | Sold Out | 13.2K | 0 | -13.2K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Sold Out | 13.0K | 0 | -13.0K |
| STIFEL FINANCIAL CORP | New | 0 | 12.9K | +12.9K |
| Virtu Financial LLC | New | 0 | 11.9K | +11.9K |
| TWO SIGMA SECURITIES, LLC | New | 0 | 11.9K | +11.9K |
| Balyasny Asset Management L.P. | New | 0 | 11.9K | +11.9K |
| UBS Group AG | Reduced | 37.1K | 25.8K | -11.4K |
| Schonfeld Strategic Advisors LLC | Sold Out | 11.3K | 0 | -11.3K |
| Bronte Capital Management Pty Ltd. | New | 0 | 10.7K | +10.7K |
| INTECH INVESTMENT MANAGEMENT LLC | New | 0 | 10.4K | +10.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.