ABOS Institutional Ownership & Shareholders
ACUMEN PHARMACEUTICALS INC (ABOS) is currently held by 97 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $121.25M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Ra Capital Management, L.P. is currently the largest disclosed institutional shareholder of ABOS tracked by InsiderSet, reporting ownership valued at approximately $56.05M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $4.41M, representing an estimated loss of -92.13% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 84% of the total disclosed ABOS value among the investors covered in this analysis. Major shareholders include Ra Capital Management, L.P., Sands Capital Alternatives, Llc, Blackrock, Inc., and several other long-term asset managers with concentrated positions in ACUMEN PHARMACEUTICALS INC (ABOS).
This page ranks the largest institutional ABOS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
97
Total Reported Value
$121.25M
Largest Holder
Ra Capital Management, L.P.
Largest Position
$56.05M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
123
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Ra Capital Management, L.P. | 0.49% | 20,992,669 | $56,050,426 | $4,410,560 | -$51,639,866 | -92.13% | |
| Sands Capital Alternatives, Llc | 1.62% | 3,720,105 | $9,932,680 | $781,594 | -$9,151,086 | -92.13% | |
| Blackrock, Inc. | 0.00% | 2,490,115 | $6,648,607 | $523,173 | -$6,125,434 | -92.13% | |
| Alyeska Investment Group, L.P. | 0.02% | 2,454,754 | $6,554,193 | $515,744 | -$6,038,449 | -92.13% | |
| Adar1 Capital Management, Llc | 0.26% | 2,111,334 | $5,637,262 | $443,591 | -$5,193,671 | -92.13% | |
| Vanguard Capital Management Llc | 0.00% | 1,672,072 | $4,464,432 | $351,302 | -$4,113,130 | -92.13% | |
| Knollwood Investment Advisory, Llc | 0.39% | 1,628,510 | $4,348,122 | $342,150 | -$4,005,972 | -92.13% | |
| Geode Capital Management, Llc | 0.00% | 1,141,858 | $3,049,286 | $239,904 | -$2,809,382 | -92.13% | |
| Ikarian Capital, Llc | 0.46% | 1,053,797 | $2,813,638 | $221,403 | -$2,592,235 | -92.13% | |
| Hudson Bay Capital Management Lp | 0.01% | 955,000 | $2,549,850 | $200,646 | -$2,349,205 | -92.13% | |
| Pathstone Holdings, Llc | 0.01% | 859,110 | $2,027,500 | $180,499 | -$1,847,001 | -91.10% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 675,025 | $1,802,317 | $141,823 | -$1,660,494 | -92.13% |
| Two Sigma Investments, Lp | 0.00% | 622,882 | $1,663,095 | $130,868 | -$1,532,227 | -92.13% | |
| State Street Corp | 0.00% | 600,528 | $1,603,410 | $126,171 | -$1,477,239 | -92.13% | |
| Northern Trust Corp | 0.00% | 360,744 | $963,187 | $75,792 | -$887,395 | -92.13% | |
| Vanguard Portfolio Management Llc | 0.00% | 320,795 | $856,523 | $67,399 | -$789,124 | -92.13% | |
| Dimensional Fund Advisors Lp | 0.00% | 291,559 | $778,969 | $61,257 | -$717,712 | -92.14% | |
| Vanguard Fiduciary Trust Co | 0.00% | 291,240 | $777,611 | $61,190 | -$716,421 | -92.13% | |
| Bank Of America Corp | 0.00% | 274,781 | $733,665 | $57,731 | -$675,934 | -92.13% | |
| Boothbay Fund Management, Llc | 0.01% | 273,012 | $728,942 | $57,360 | -$671,582 | -92.13% | |
| Acadian Asset Management Llc | 0.00% | 270,338 | $718,000 | $56,798 | -$661,202 | -92.09% | |
| Nomura Holdings Inc | 0.00% | 189,712 | $506,531 | $39,858 | -$466,673 | -92.13% | |
| Goldman Sachs Group Inc | 0.00% | 183,927 | $491,085 | $38,643 | -$452,442 | -92.13% | |
| Bridgeway Capital Management, Llc | 0.01% | 176,171 | $470,377 | $37,014 | -$433,363 | -92.13% | |
| Morgan Stanley | 0.00% | 136,763 | $365,157 | $28,734 | -$336,423 | -92.13% | |
| Susquehanna International Group, Llp | 0.00% | 126,104 | $336,698 | $26,494 | -$310,204 | -92.13% | |
| Bank Of New York Mellon Corp | 0.00% | 124,377 | $332,086 | $26,132 | -$305,954 | -92.13% | |
| Charles Schwab Investment Management Inc | 0.00% | 115,099 | $307,314 | $24,182 | -$283,132 | -92.13% | |
| Pfg Investments, Llc | 0.01% | 94,250 | $251,648 | $19,802 | -$231,846 | -92.13% | |
| Catalyst Financial Partners Llc | 0.02% | 89,699 | $239,496 | $18,846 | -$220,650 | -92.13% | |
| Nuveen, Llc | 0.00% | 63,355 | $169,158 | $13,311 | -$155,847 | -92.13% | |
| Millennium Management Llc | 0.00% | 60,598 | $161,797 | $12,732 | -$149,065 | -92.13% | |
| Squarepoint Ops Llc | 0.00% | 52,351 | $139,777 | $10,999 | -$128,778 | -92.13% | |
| Citadel Advisors Llc | 0.00% | 51,049 | $136,301 | $10,725 | -$125,576 | -92.13% | |
| Prospera Financial Services Inc | 0.00% | 50,000 | $133,500 | $10,505 | -$122,995 | -92.13% | |
| Wells Fargo & Company/Mn | 0.00% | 49,686 | $132,661 | $10,439 | -$122,222 | -92.13% | |
| Marshall Wace, Llp | 0.00% | 48,114 | $128,465 | $10,109 | -$118,356 | -92.13% | |
| Deutsche Bank Ag\ | 0.00% | 46,132 | $123,172 | $9,692 | -$113,480 | -92.13% | |
| Verdad Advisers, Lp | 0.11% | 44,478 | $118,756 | $9,345 | -$109,411 | -92.13% | |
| Price T Rowe Associates Inc | 0.00% | 39,327 | $106,000 | $8,263 | -$97,737 | -92.21% | |
| Barclays Plc | 0.00% | 39,655 | $105,878 | $8,332 | -$97,546 | -92.13% | |
| Qube Research & Technologies Ltd | 0.00% | 38,614 | $103,099 | $8,113 | -$94,986 | -92.13% | |
| New York State Common Retirement Fund | 0.00% | 36,200 | $96,654 | $7,606 | -$89,048 | -92.13% | |
| Rhumbline Advisers | 0.00% | 35,034 | $93,535 | $7,361 | -$86,174 | -92.13% | |
| Rangeley Capital, Llc | 0.09% | 35,000 | $93,450 | $7,354 | -$86,097 | -92.13% | |
| Xtx Topco Ltd | 0.00% | 32,134 | $85,798 | $6,751 | -$79,047 | -92.13% | |
| Intrepid Financial Planning Group Llc | 0.03% | 30,150 | $80,501 | $6,335 | -$74,166 | -92.13% | |
| Quantinno Capital Management Lp | 0.00% | 26,769 | $71,473 | $5,624 | -$65,849 | -92.13% | |
| Ubs Group Ag | 0.00% | 25,765 | $68,793 | $5,413 | -$63,380 | -92.13% | |
| Invesco Ltd. | 0.00% | 24,588 | $65,650 | $5,166 | -$60,484 | -92.13% |
Frequently asked questions about ABOS
Who are the largest institutional holders of ABOS?
The largest institutional holders of ABOS reported in the latest SEC Form 13F filings include Ra Capital Management, L.P., Sands Capital Alternatives, Llc, Blackrock, Inc., Alyeska Investment Group, L.P., and Adar1 Capital Management, Llc. InsiderSet ranks institutional holders by their latest reported ABOS position.
What is ABOS institutional ownership?
This page tracks ABOS positions reported by institutional investment managers through SEC Form 13F. ACUMEN PHARMACEUTICALS INC (ABOS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ABOS?
InsiderSet currently tracks 97 institutional managers reporting ABOS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ABOS shareholders.
How much ABOS stock do institutions own?
Institutional investment managers disclosed approximately $121.25M in ABOS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ABOS institutional ownership last updated?
The latest ABOS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ABOS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ABOS position after the reporting date.
Are institutions buying or selling ABOS?
Institutional buying and selling can be analyzed by comparing ABOS positions across consecutive 13F reporting periods. InsiderSet's ABOS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ABOS ownership changes.
How has ABOS institutional ownership changed over time?
InsiderSet tracks ABOS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.