Acumen Pharmaceuticals, Inc. (ABOS) — Institutional Holders, Q2 2026
96 institutional investment managers reported a ABOS position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $127.8M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ABOS in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- BlackRockAdded · +2,311,789 sh+$6.2M
- GEODE CAPITAL MANAGEMENTAdded · +725,620 sh+$1.9M
- STATE STREETAdded · +448,800 sh+$1.2M
- VANGUARD PORTFOLIO MANAGEMENTNew · +320,795 sh+$856.5K
- NORTHERNAdded · +285,532 sh+$762.4K
Biggest sellers
- FMRTrimmed · -1,149,816 sh-$3.1M
- SG Americas SecuritiesSold out · -719,257 sh-$1.9M
- MILLENNIUM MANAGEMENTTrimmed · -599,077 sh-$1.6M
- Laurion Capital ManagementSold out · -525,444 sh-$1.4M
- SUSQUEHANNA INTERNATIONAL GROUP, LLPTrimmed · -475,372 sh-$1.3M
ABOS 13F holders ranked 1–96 of 96
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P.#1 · 20,992,669 sh | 20,992,669 | $56.1M | 0.49% | 0.0% |
| 2 | Sands Capital Ventures#2 · 3,720,105 sh | 3,720,105 | $9.9M | 1.62% | 0.0% |
| 3 | BlackRock#3 · 2,490,115 sh | 2,490,115 | $6.6M | <0.01% | +1296.4% |
| 4 | Alyeska Investment Group, L.P.#4 · 2,454,754 sh | 2,454,754 | $6.6M | 0.02% | 0.0% |
| 5 | FRANKLIN RESOURCES#5 · 2,305,096 sh | 2,305,096 | $6.2M | <0.01% | 0.0% |
| 6 | ADAR1 Capital Management#6 · 2,111,334 sh | 2,111,334 | $5.6M | 0.26% | -2.1% |
| 7 | VANGUARD CAPITAL MANAGEMENT#7 · 1,672,072 sh | 1,672,072 | $4.5M | <0.01% | +11.0% |
| 8 | Knollwood Investment Advisory#8 · 1,628,510 sh | 1,628,510 | $4.3M | 0.39% | 0.0% |
| 9 | GEODE CAPITAL MANAGEMENT#9 · 1,141,858 sh | 1,141,858 | $3.0M | <0.01% | +174.3% |
| 10 | Ikarian Capital#10 · 1,053,797 sh | 1,053,797 | $2.8M | 0.30% | 0.0% |
| 11 | Hudson Bay Capital Management#11 · 955,000 sh | 955,000 | $2.5M | <0.01% | -1.4% |
| 12 | Pathstone#12 · 859,110 sh | 859,110 | $2.3M | <0.01% | 0.0% |
| 13 | RENAISSANCE TECHNOLOGIES#13 · 675,025 sh | 675,025 | $1.8M | <0.01% | +42.4% |
| 14 | TWO SIGMA INVESTMENTS#14 · 622,882 sh | 622,882 | $1.7M | <0.01% | +17.3% |
| 15 | STATE STREET#15 · 600,528 sh | 600,528 | $1.6M | 0.00% | +295.8% |
| 16 | NORTHERN#16 · 360,744 sh | 360,744 | $963.2K | <0.01% | +379.6% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT#17 · 320,795 sh | 320,795 | $856.5K | 0.00% | New |
| 18 | DIMENSIONAL FUND ADVISORS#18 · 291,559 sh | 291,559 | $779.0K | <0.01% | +143.5% |
| 19 | VANGUARD FIDUCIARY#19 · 291,240 sh | 291,240 | $777.6K | <0.01% | +46.2% |
| 20 | BANK OF AMERICA#20 · 274,781 sh | 274,781 | $733.7K | 0.00% | -14.2% |
| 21 | BOOTHBAY FUND MANAGEMENT#21 · 273,012 sh | 273,012 | $728.9K | <0.01% | 0.0% |
| 22 | ACADIAN ASSET MANAGEMENT#22 · 270,338 sh | 270,338 | $718.0K | <0.01% | +45.5% |
| 23 | NOMURA#23 · 189,712 sh | 189,712 | $506.5K | <0.01% | New |
| 24 | GOLDMAN SACHS GROUP#24 · 183,927 sh | 183,927 | $491.1K | 0.00% | -11.0% |
| 25 | BRIDGEWAY CAPITAL MANAGEMENT#25 · 176,171 sh | 176,171 | $470.4K | <0.01% | 0.0% |
| 26 | MORGAN STANLEY#26 · 136,763 sh | 136,763 | $365.2K | 0.00% | -5.4% |
| 27 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#27 · 126,104 sh | 126,104 | $336.7K | 0.00% | -79.0% |
| 28 | Bank of New York Mellon#28 · 124,377 sh | 124,377 | $332.1K | <0.01% | New |
| 29 | CHARLES SCHWAB INVESTMENT MANAGEMENT#29 · 115,099 sh | 115,099 | $307.3K | 0.00% | New |
| 30 | PFG Investments#30 · 94,250 sh | 94,250 | $251.6K | <0.01% | +16.6% |
| 31 | CATALYST FINANCIAL PARTNERS#31 · 89,699 sh | 89,699 | $239.5K | 0.02% | 0.0% |
| 32 | Nuveen#32 · 63,355 sh | 63,355 | $169.2K | 0.00% | New |
| 33 | MILLENNIUM MANAGEMENT#33 · 60,598 sh | 60,598 | $161.8K | <0.01% | -90.8% |
| 34 | Squarepoint Ops#34 · 52,351 sh | 52,351 | $139.8K | <0.01% | +248.7% |
| 35 | CITADEL ADVISORS#35 · 51,049 sh | 51,049 | $136.3K | 0.00% | New |
| 36 | Prospera Financial Services#36 · 50,000 sh | 50,000 | $133.5K | <0.01% | 0.0% |
| 37 | WELLS FARGO & COMPANY#37 · 49,686 sh | 49,686 | $132.7K | 0.00% | +391.6% |
| 38 | MARSHALL WACE, LLP#38 · 48,114 sh | 48,114 | $128.5K | <0.01% | -75.1% |
| 39 | DEUTSCHE BANK AG\#39 · 46,132 sh | 46,132 | $123.2K | 0.00% | New |
| 40 | Verdad Advisers#40 · 44,478 sh | 44,478 | $118.8K | 0.11% | +19.3% |
| 41 | PRICE T ROWE ASSOCIATES#41 · 39,327 sh | 39,327 | $106.0K | 0.00% | New |
| 42 | BARCLAYS PLC#42 · 39,655 sh | 39,655 | $105.9K | 0.00% | +29.3% |
| 43 | Qube Research & Technologies Ltd#43 · 38,614 sh | 38,614 | $103.1K | <0.01% | -67.9% |
| 44 | NEW YORK STATE COMMON RETIREMENT FUND#44 · 36,200 sh | 36,200 | $96.7K | <0.01% | New |
| 45 | RHUMBLINE ADVISERS#45 · 35,034 sh | 35,034 | $93.5K | <0.01% | New |
| 46 | Rangeley Capital#46 · 35,000 sh | 35,000 | $93.5K | 0.09% | 0.0% |
| 47 | XTX Topco Ltd#47 · 32,134 sh | 32,134 | $85.8K | <0.01% | New |
| 48 | Intrepid Financial Planning Group#48 · 30,150 sh | 30,150 | $80.5K | 0.03% | 0.0% |
| 49 | Y-Intercept (Hong Kong) Ltd#49 · 29,540 sh | 29,540 | $78.9K | — | New |
| 50 | Quantinno Capital Management#50 · 26,769 sh | 26,769 | $71.5K | <0.01% | New |
| 51 | UBS Group AG#51 · 25,765 sh | 25,765 | $68.8K | 0.00% | -30.6% |
| 52 | Invesco Ltd.#52 · 24,588 sh | 24,588 | $65.7K | 0.00% | New |
| 53 | AXQ CAPITAL#53 · 24,426 sh | 24,426 | $65.2K | <0.01% | -14.3% |
| 54 | AMERICAN CENTURY COMPANIES#54 · 24,136 sh | 24,136 | $64.4K | 0.00% | +34.6% |
| 55 | CITIGROUP#55 · 21,889 sh | 21,889 | $58.4K | 0.00% | +387.9% |
| 56 | MIRAE ASSET GLOBAL ETFS Ltd.#56 · 21,761 sh | 21,761 | $58.1K | <0.01% | New |
| 57 | JPMORGAN CHASE#57 · 20,161 sh | 20,161 | $55.8K | 0.00% | +1296.2% |
| 58 | Police & Firemen's Retirement System of New Jersey#58 · 19,393 sh | 19,393 | $51.8K | <0.01% | New |
| 59 | Independent Advisor Alliance#59 · 19,000 sh | 19,000 | $50.7K | <0.01% | 0.0% |
| 60 | Pinnacle Wealth Management Advisory Group#60 · 18,020 sh | 18,020 | $48.1K | — | 0.0% |
| 61 | PINNACLE ASSOCIATES LTD#61 · 18,020 sh | 18,020 | $48.1K | — | 0.0% |
| 62 | CLUNE & ASSOCIATES, LTD.#62 · 16,500 sh | 16,500 | $44.1K | — | 0.0% |
| 63 | Spark Investment Management#63 · 14,700 sh | 14,700 | $39.2K | 0.08% | New |
| 64 | STIFEL FINANCIAL#64 · 12,900 sh | 12,900 | $34.4K | 0.00% | New |
| 65 | Virtu Financial#65 · 11,940 sh | 11,940 | $32.0K | <0.01% | New |
| 66 | TWO SIGMA SECURITIES#66 · 11,892 sh | 11,892 | $31.8K | <0.01% | New |
| 67 | BALYASNY ASSET MANAGEMENT L.P.#67 · 11,872 sh | 11,872 | $31.7K | 0.00% | New |
| 68 | SEI INVESTMENTS#68 · 11,564 sh | 11,564 | $30.9K | 0.00% | 0.0% |
| 69 | BNP PARIBAS FINANCIAL MARKETS#69 · 11,329 sh | 11,329 | $30.2K | 0.00% | +837.8% |
| 70 | Mesirow Financial Investment Management#70 · 11,305 sh | 11,305 | $30.2K | <0.01% | 0.0% |
| 71 | Bronte Capital Management Pty Ltd.#71 · 10,716 sh | 10,716 | $28.6K | <0.01% | New |
| 72 | INTECH INVESTMENT MANAGEMENT#72 · 10,446 sh | 10,446 | $27.9K | <0.01% | New |
| 73 | Integrated Wealth Concepts#73 · 10,179 sh | 10,179 | $27.2K | <0.01% | 0.0% |
| 74 | Steward Partners Investment Advisory#74 · 10,000 sh | 10,000 | $26.7K | <0.01% | New |
| 75 | FMR#75 · 7,530 sh | 7,530 | $20.1K | 0.00% | -99.3% |
| 76 | OSAIC#76 · 7,350 sh | 7,350 | $19.6K | 0.00% | +37.4% |
| 77 | Vanguard Global Advisers#77 · 6,684 sh | 6,684 | $17.8K | 0.00% | 0.0% |
| 78 | Legal & General Group Plc#78 · 4,610 sh | 4,610 | $12.3K | 0.00% | New |
| 79 | Ameritas Investment Partners#79 · 4,289 sh | 4,289 | $11.5K | <0.01% | New |
| 80 | Russell Investments Group, Ltd.#80 · 3,779 sh | 3,779 | $10.1K | 0.00% | New |
| 81 | PNC FINANCIAL SERVICES GROUP#81 · 3,080 sh | 3,080 | $8.2K | 0.00% | 0.0% |
| 82 | Rockefeller Capital Management L.P.#82 · 3,000 sh | 3,000 | $8.0K | 0.00% | 0.0% |
| 83 | Tower Research Capital (TRC)#83 · 2,899 sh | 2,899 | $7.7K | <0.01% | +2356.8% |
| 84 | TFC Financial Management#84 · 2,500 sh | 2,500 | $6.7K | — | 0.0% |
| 85 | JONES FINANCIAL COMPANIES LLLP#85 · 2,000 sh | 2,000 | $4.7K | 0.00% | 0.0% |
| 86 | ROYAL BANK OF CANADA#86 · 1,561 sh | 1,561 | $4.0K | 0.00% | -78.0% |
| 87 | NISA INVESTMENT ADVISORS#87 · 1,229 sh | 1,229 | $3.3K | — | 0.0% |
| 88 | US BANCORP \DE\#88 · 1,000 sh | 1,000 | $2.7K | 0.00% | 0.0% |
| 89 | Sterling Capital Management#89 · 952 sh | 952 | $2.5K | — | New |
| 90 | GROUP ONE TRADING, L.P.#90 · 722 sh | 722 | $1.9K | 0.00% | -51.1% |
| 91 | EverSource Wealth Advisors#91 · 407 sh | 407 | $1.1K | 0.00% | +1750.0% |
| 92 | Avion Wealth#92 · 500 sh | 500 | $1.0K | <0.01% | New |
| 93 | SBI Securities , Ltd.#93 · 291 sh | 291 | $777.00 | — | -4.0% |
| 94 | Farther Finance Advisors#94 · 200 sh | 200 | $534.00 | — | 0.0% |
| 95 | Caitong International Asset Management , Ltd#95 · 39 sh | 39 | $104.00 | 0.00% | New |
| 96 | SRS Capital Advisors#96 · 26 sh | 26 | $69.00 | 0.00% | 0.0% |
Funds that sold out of ABOS in Q2 2026 (17)
Held ABOS at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| SG Americas Securities719,257 sh | 719,257 | $1.7M |
| Laurion Capital Management525,444 sh | 525,444 | $1.2M |
| JANE STREET GROUP89,661 sh | 89,661 | $211.6K |
| Point72 Asset Management, L.P.67,375 sh | 67,375 | $159.0K |
| Catalyst Funds Management Pty Ltd45,600 sh | 45,600 | $107.6K |
| OMERS ADMINISTRATION28,600 sh | 28,600 | $67.5K |
| SIMPLEX TRADING17,414 sh | 17,414 | $41.1K |
| CAPTRUST FINANCIAL ADVISORS15,757 sh | 15,757 | $37.2K |
| Brevan Howard Capital Management15,385 sh | 15,385 | $36.3K |
| HRT FINANCIAL13,162 sh | 13,162 | $31.0K |
| JACOBS LEVY EQUITY MANAGEMENT13,011 sh | 13,011 | $30.7K |
| Schonfeld Strategic Advisors11,300 sh | 11,300 | $26.7K |
| Advisory Services Network1,111 sh | 1,111 | $2.6K |
| NBT BANK N A200 sh | 200 | $472.00 |
| Clearstead Advisors60 sh | 60 | $142.00 |
| Larson Financial Group20 sh | 20 | $47.00 |
| Optiver Holding B.V.5 sh | 5 | $12.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.