DaveManuel.com · Institutional Ownership · Who Owns It
Acumen Pharmaceuticals Inc (ABOS)
Institutional ownership reported to the SEC as of Q2 2026, across 21 quarters.
97
Reporting holders
$128.2M
Reported value
66.2%
Of shares outstanding
0.3%
Calls
0.0%
Puts
+12
Holder change
Institutions report 47,856,762 shares against 72,317,285 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | $56.1M | 20,992,669 | 0.49% | 20q | HELD |
| Sands Capital Alternatives, LLC | $9.9M | 3,720,105 | 1.62% | 20q | HELD |
| BlackRock, Inc. | $6.6M | 2,490,115 | 0.00% | 8q | +1296.4%+$6.2M |
| Alyeska Investment Group, L.P. | $6.6M | 2,454,754 | 0.02% | 12q | HELD |
| FRANKLIN RESOURCES INC | $6.2M | 2,305,096 | 0.00% | 12q | HELD |
| ADAR1 Capital Management, LLC | $5.6M | 2,111,334 | 0.26% | 7q | -2.1%-$120.2K |
| VANGUARD CAPITAL MANAGEMENT LLC | $4.5M | 1,672,072 | 0.00% | 2q | +11.0%+$442.7K |
| Knollwood Investment Advisory, LLC | $4.3M | 1,628,510 | 0.39% | 15q | HELD |
| GEODE CAPITAL MANAGEMENT, LLC | $3.0M | 1,141,858 | 0.00% | 20q | +174.3%+$1.9M |
| Ikarian Capital, LLC | $2.8M | 1,053,797 | 0.30% | 16q | HELD |
| Hudson Bay Capital Management LP | $2.5M | 955,000 | 0.01% | 15q | -1.4%-$37.2K |
| Pathstone Holdings, LLC | $2.3M | 859,110 | 0.01% | 11q | HELD |
| RENAISSANCE TECHNOLOGIES LLC | $1.8M | 675,025 | 0.00% | 9q | +42.4%+$536.9K |
| TWO SIGMA INVESTMENTS, LP | $1.7M | 622,882 | 0.00% | 15q | +17.3%+$245.8K |
| STATE STREET CORP | $1.6M | 600,528 | 0.00% | 20q | +295.8%+$1.2M |
| NORTHERN TRUST CORP | $963.2K | 360,744 | 0.00% | 20q | +379.6%+$762.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $856.5K | 320,795 | 0.00% | new | NEW |
| DIMENSIONAL FUND ADVISORS LP | $779.0K | 291,559 | 0.00% | 14q | +143.5%+$459.0K |
| VANGUARD FIDUCIARY TRUST CO | $777.6K | 291,240 | 0.00% | 2q | +46.2%+$245.7K |
| BANK OF AMERICA CORP /DE/ | $733.7K | 274,781 | 0.00% | 20q | -14.2%-$121.3K |
| BOOTHBAY FUND MANAGEMENT, LLC | $728.9K | 273,012 | 0.01% | 17q | HELD |
| ACADIAN ASSET MANAGEMENT LLC | $718.0K | 270,338 | 0.00% | 4q | +45.5%+$224.4K |
| NOMURA HOLDINGS INC | $506.5K | 189,712 | 0.00% | new | NEW |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $495.3K incl. $158.6K options CALL | 126,104 | 0.00% | 17q | -79.0%-$1.9M |
| GOLDMAN SACHS GROUP INC | $491.1K | 183,927 | 0.00% | 20q | -11.0%-$60.8K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | $470.4K | 176,171 | 0.01% | 10q | HELD |
| MORGAN STANLEY | $365.2K | 136,763 | 0.00% | 20q | -5.4%-$20.9K |
| Bank of New York Mellon Corp | $332.1K | 124,377 | 0.00% | new | NEW |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $307.3K | 115,099 | 0.00% | new | NEW |
| PFG Investments, LLC | $251.6K | 94,250 | 0.01% | 4q | +16.6%+$35.8K |
| CATALYST FINANCIAL PARTNERS LLC | $239.5K | 89,699 | 0.02% | 13q | HELD |
| GROUP ONE TRADING LLC | $224.6K incl. $222.7K options CALL | 722 | 0.00% | new | NEW |
| Nuveen, LLC | $169.2K | 63,355 | 0.00% | new | NEW |
| MILLENNIUM MANAGEMENT LLC | $161.8K | 60,598 | 0.00% | 17q | -90.8%-$1.6M |
| Squarepoint Ops LLC | $139.8K | 52,351 | 0.00% | 2q | +248.7%+$99.7K |
| CITADEL ADVISORS LLC | $136.3K | 51,049 | 0.00% | 20q | HELD |
| Prospera Financial Services Inc | $133.5K | 50,000 | 0.00% | 3q | HELD |
| WELLS FARGO & COMPANY/MN | $132.7K | 49,686 | 0.00% | 20q | +391.6%+$105.7K |
| MARSHALL WACE, LLP | $128.5K | 48,114 | 0.00% | 3q | -75.1%-$386.6K |
| DEUTSCHE BANK AG\ | $123.2K | 46,132 | 0.00% | new | NEW |
| Verdad Advisers, LP | $118.8K | 44,478 | 0.11% | 2q | +19.3%+$19.2K |
| PRICE T ROWE ASSOCIATES INC /MD/ | $106.0K | 39,327 | 0.00% | new | NEW |
| BARCLAYS PLC | $105.9K | 39,655 | 0.00% | 18q | +29.3%+$24.0K |
| Qube Research & Technologies Ltd | $103.1K | 38,614 | 0.00% | 12q | -67.9%-$218.3K |
| NEW YORK STATE COMMON RETIREMENT FUND | $96.7K | 36,200 | 0.00% | new | NEW |
| RHUMBLINE ADVISERS | $93.5K | 35,034 | 0.00% | new | NEW |
| Rangeley Capital, LLC | $93.5K | 35,000 | 0.09% | 2q | HELD |
| XTX Topco Ltd | $85.8K | 32,134 | 0.00% | new | NEW |
| Intrepid Financial Planning Group LLC | $80.5K | 30,150 | 0.03% | 15q | HELD |
| Y-Intercept (Hong Kong) Ltd | $78.9K | 29,540 | 0.00% | new | NEW |
| Quantinno Capital Management LP | $71.5K | 26,769 | 0.00% | new | NEW |
| UBS Group AG | $68.8K | 25,765 | 0.00% | 12q | -30.6%-$30.4K |
| Invesco Ltd. | $65.7K | 24,588 | 0.00% | new | NEW |
| AXQ CAPITAL, LP | $65.2K | 24,426 | 0.01% | 2q | -14.3%-$10.8K |
| AMERICAN CENTURY COMPANIES INC | $64.4K | 24,136 | 0.00% | 2q | +34.6%+$16.6K |
| CITIGROUP INC | $58.4K | 21,889 | 0.00% | 2q | +387.9%+$46.5K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $58.1K | 21,761 | 0.00% | new | NEW |
| JPMORGAN CHASE & CO | $55.8K | 20,161 | 0.00% | 20q | +1296.2%+$51.8K |
| Police & Firemen's Retirement System of New Jersey | $51.8K | 19,393 | 0.00% | new | NEW |
| Independent Advisor Alliance | $50.7K | 19,000 | 0.00% | 3q | HELD |
| PINNACLE ASSOCIATES LTD | $48.1K | 18,020 | 0.00% | 7q | HELD |
| Pinnacle Wealth Management Advisory Group, LLC | $48.1K | 18,020 | 0.00% | 10q | HELD |
| Factor Wealth Management LTD | $44.1K | 16,500 | 0.01% | 7q | HELD |
| Spark Investment Management LLC | $39.2K | 14,700 | 0.08% | new | NEW |
| SIMPLEX TRADING, LLC | $36.3K CALL | options only | 0.00% | 12q | OPTIONS |
| STIFEL FINANCIAL CORP | $34.4K | 12,900 | 0.00% | new | NEW |
| Virtu Financial LLC | $32.0K | 11,940 | 0.00% | new | NEW |
| TWO SIGMA SECURITIES, LLC | $31.8K | 11,892 | 0.00% | new | NEW |
| Balyasny Asset Management L.P. | $31.7K | 11,872 | 0.00% | new | NEW |
| SEI INVESTMENTS CO | $30.9K | 11,564 | 0.00% | 2q | HELD |
| BNP PARIBAS FINANCIAL MARKETS | $30.2K | 11,329 | 0.00% | 7q | +837.8%+$27.0K |
| Mesirow Financial Investment Management, Inc. | $30.2K | 11,305 | 0.00% | 2q | HELD |
| Bronte Capital Management Pty Ltd. | $28.6K | 10,716 | 0.00% | new | NEW |
| INTECH INVESTMENT MANAGEMENT LLC | $27.9K | 10,446 | 0.00% | new | NEW |
| Integrated Wealth Concepts LLC | $27.2K | 10,179 | 0.00% | 2q | HELD |
| Steward Partners Investment Advisory, LLC | $26.7K | 10,000 | 0.00% | new | NEW |
| FMR LLC | $20.1K | 7,530 | 0.00% | 10q | -99.3%-$3.1M |
| OSAIC HOLDINGS, INC. | $19.6K | 7,350 | 0.00% | 12q | +37.4%+$5.3K |
| Vanguard Global Advisers, LLC | $17.8K | 6,684 | 0.00% | 2q | HELD |
| Legal & General Group Plc | $12.3K | 4,610 | 0.00% | new | NEW |
| Ameritas Investment Partners, Inc. | $11.5K | 4,289 | 0.00% | new | NEW |
| Russell Investments Group, Ltd. | $10.1K | 3,779 | 0.00% | new | NEW |
| PNC Financial Services Group, Inc. | $8.2K | 3,080 | 0.00% | 6q | HELD |
| Rockefeller Capital Management L.P. | $8.0K | 3,000 | 0.00% | 4q | HELD |
| Tower Research Capital LLC (TRC) | $7.7K | 2,899 | 0.00% | 3q | +2356.8%+$7.4K |
| TFC Financial Management, Inc. | $6.7K | 2,500 | 0.00% | 4q | HELD |
| JONES FINANCIAL COMPANIES LLLP | $4.7K | 2,000 | 0.00% | 2q | HELD |
| ROYAL BANK OF CANADA | $4.0K | 1,561 | 0.00% | 9q | -78.0%-$14.2K |
| NISA INVESTMENT ADVISORS, LLC | $3.3K | 1,229 | 0.00% | 5q | HELD |
| US BANCORP \DE\ | $2.7K | 1,000 | 0.00% | 2q | HELD |
| Sterling Capital Management LLC | $2.5K | 952 | 0.00% | new | NEW |
| EverSource Wealth Advisors, LLC | $1.1K | 407 | 0.00% | 6q | HELD |
| Avion Wealth | $1.0K | 500 | 0.00% | new | NEW |
| SBI Securities Co., Ltd. | $777 | 291 | 0.00% | 7q | -4.0% |
| Farther Finance Advisors, LLC | $534 | 200 | 0.00% | 5q | HELD |
| Caitong International Asset Management Co., Ltd | $104 | 39 | 0.00% | new | NEW |
| Arax Advisory Partners | $69 | 26 | 0.00% | 4q | HELD |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 12 | $132.7K | 59,776 | 3 | 1 | 3 | 0.0% |
| Q2 2026 | 97 | $128.2M | 47,856,762 | 30 | 21 | 15 | 0.3% |
| Q1 2026 | 85 | $109.1M | 46,001,105 | 21 | 31 | 12 | 0.6% |
| Q4 2025 | 70 | $75.3M | 35,659,731 | 12 | 12 | 18 | 0.1% |
| Q3 2025 | 69 | $61.2M | 35,735,743 | 13 | 8 | 25 | 0.1% |
| Q2 2025 | 73 | $43.7M | 37,614,324 | 17 | 14 | 21 | 0.1% |
| Q1 2025 | 82 | $44.9M | 40,269,151 | 11 | 13 | 32 | 0.2% |
| Q4 2024 | 79 | $73.4M | 42,532,701 | 13 | 26 | 16 | 0.4% |
| Q3 2024 | 73 | $110.3M | 43,668,332 | 9 | 22 | 19 | 2.2% |
| Q2 2024 | 83 | $108.4M | 43,599,074 | 23 | 19 | 19 | 2.6% |
| Q1 2024 | 80 | $181.9M | 43,534,143 | 24 | 20 | 23 | 3.1% |
| Q4 2023 | 67 | $153.2M | 38,498,079 | 19 | 26 | 10 | 3.5% |
| Q3 2023 | 66 | $183.6M | 43,711,726 | 26 | 23 | 10 | 1.2% |
| Q2 2023 | 54 | $128.9M | 26,329,240 | 10 | 12 | 20 | 1.8% |
| Q1 2023 | 62 | $114.5M | 28,087,987 | 10 | 18 | 21 | 0.4% |
| Q4 2022 | 61 | $158.8M | 29,258,073 | 17 | 19 | 15 | 0.5% |
| Q3 2022 | 53 | $283.0M | 27,761,157 | 19 | 17 | 12 | 1.6% |
| Q2 2022 | 45 | $120.5M | 25,628,693 | 11 | 9 | 20 | 0.1% |
| Q1 2022 | 54 | $106.1M | 27,099,469 | 14 | 25 | 7 | 0.1% |
| Q4 2021 | 51 | $172.9M | 25,587,862 | 11 | 23 | 5 | 0.0% |
| Q3 2021 | 41 | $357.4M | 24,050,159 | 40 | 0 | 0 | 0.0% |