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.
Sign in or subscribeLargest 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 |
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.