ACUMEN PHARMACEUTICALS INC (ABOS) Institutional Shareholders
ACUMEN PHARMACEUTICALS INC (ABOS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $121.35M in ABOS holdings during the latest filing period.
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 $53.95M, representing an estimated loss of -3.75% 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
95
Total Reported Value
$121.35M
Largest Holder
Ra Capital Management, L.P.
Largest Position
$56.05M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
120
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 | $53,951,159 | -$2,099,267 | -3.75% | |
| Sands Capital Alternatives, Llc | 1.62% | 3,720,105 | $9,932,680 | $9,560,670 | -$372,010 | -3.75% | |
| Blackrock, Inc. | 0.00% | 2,490,115 | $6,648,607 | $6,399,596 | -$249,011 | -3.75% | |
| Alyeska Investment Group, L.P. | 0.02% | 2,454,754 | $6,554,193 | $6,308,718 | -$245,475 | -3.75% | |
| Adar1 Capital Management, Llc | 0.26% | 2,111,334 | $5,637,262 | $5,426,128 | -$211,134 | -3.75% | |
| Vanguard Capital Management Llc | 0.00% | 1,672,072 | $4,464,432 | $4,297,225 | -$167,207 | -3.75% | |
| Knollwood Investment Advisory, Llc | 0.39% | 1,628,510 | $4,348,122 | $4,185,271 | -$162,851 | -3.75% | |
| Geode Capital Management, Llc | 0.00% | 1,141,858 | $3,049,286 | $2,934,575 | -$114,711 | -3.76% | |
| Ikarian Capital, Llc | 0.46% | 1,053,797 | $2,813,638 | $2,708,258 | -$105,380 | -3.75% | |
| Hudson Bay Capital Management Lp | 0.01% | 955,000 | $2,549,850 | $2,454,350 | -$95,500 | -3.75% | |
| Pathstone Holdings, Llc | 0.01% | 859,110 | $2,027,500 | $2,207,913 | +$180,413 | +8.90% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 675,025 | $1,802,317 | $1,734,814 | -$67,503 | -3.75% |
| Two Sigma Investments, Lp | 0.00% | 622,882 | $1,663,095 | $1,600,807 | -$62,288 | -3.75% | |
| State Street Corp | 0.00% | 600,528 | $1,603,410 | $1,543,357 | -$60,053 | -3.75% | |
| Northern Trust Corp | 0.00% | 360,744 | $963,187 | $927,112 | -$36,075 | -3.75% | |
| Vanguard Portfolio Management Llc | 0.00% | 320,795 | $856,523 | $824,443 | -$32,080 | -3.75% | |
| Dimensional Fund Advisors Lp | 0.00% | 291,559 | $778,969 | $749,307 | -$29,662 | -3.81% | |
| Vanguard Fiduciary Trust Co | 0.00% | 291,240 | $777,611 | $748,487 | -$29,124 | -3.75% | |
| Bank Of America Corp | 0.00% | 274,781 | $733,665 | $706,187 | -$27,478 | -3.75% | |
| Boothbay Fund Management, Llc | 0.01% | 273,012 | $728,942 | $701,641 | -$27,301 | -3.75% | |
| Acadian Asset Management Llc | 0.00% | 270,338 | $718,000 | $694,769 | -$23,231 | -3.24% | |
| Nomura Holdings Inc | 0.00% | 189,712 | $506,531 | $487,560 | -$18,971 | -3.75% | |
| Goldman Sachs Group Inc | 0.00% | 183,927 | $491,085 | $472,692 | -$18,393 | -3.75% | |
| Bridgeway Capital Management, Llc | 0.01% | 176,171 | $470,377 | $452,759 | -$17,618 | -3.75% | |
| Morgan Stanley | 0.00% | 136,763 | $365,157 | $351,481 | -$13,676 | -3.75% | |
| Susquehanna International Group, Llp | 0.00% | 126,104 | $336,698 | $324,087 | -$12,611 | -3.75% | |
| Bank Of New York Mellon Corp | 0.00% | 124,377 | $332,086 | $319,649 | -$12,437 | -3.75% | |
| Charles Schwab Investment Management Inc | 0.00% | 115,099 | $307,314 | $295,804 | -$11,510 | -3.75% | |
| Pfg Investments, Llc | 0.01% | 94,250 | $251,648 | $242,222 | -$9,426 | -3.75% | |
| Catalyst Financial Partners Llc | 0.02% | 89,699 | $239,496 | $230,526 | -$8,970 | -3.75% | |
| Nuveen, Llc | 0.00% | 63,355 | $169,158 | $162,822 | -$6,336 | -3.75% | |
| Millennium Management Llc | 0.00% | 60,598 | $161,797 | $155,737 | -$6,060 | -3.75% | |
| Squarepoint Ops Llc | 0.00% | 52,351 | $139,777 | $134,542 | -$5,235 | -3.75% | |
| Citadel Advisors Llc | 0.00% | 51,049 | $136,301 | $131,196 | -$5,105 | -3.75% | |
| Prospera Financial Services Inc | 0.00% | 50,000 | $133,500 | $128,500 | -$5,000 | -3.75% | |
| Wells Fargo & Company/Mn | 0.00% | 49,686 | $132,661 | $127,693 | -$4,968 | -3.74% | |
| Marshall Wace, Llp | 0.00% | 48,114 | $128,465 | $123,653 | -$4,812 | -3.75% | |
| Deutsche Bank Ag\ | 0.00% | 46,132 | $123,172 | $118,559 | -$4,613 | -3.74% | |
| Verdad Advisers, Lp | 0.11% | 44,478 | $118,756 | $114,308 | -$4,448 | -3.75% | |
| Price T Rowe Associates Inc | 0.00% | 39,327 | $106,000 | $101,070 | -$4,930 | -4.65% | |
| Barclays Plc | 0.00% | 39,655 | $105,878 | $101,913 | -$3,965 | -3.74% | |
| Qube Research & Technologies Ltd | 0.00% | 38,614 | $103,099 | $99,238 | -$3,861 | -3.74% | |
| New York State Common Retirement Fund | 0.00% | 36,200 | $96,654 | $93,034 | -$3,620 | -3.75% | |
| Rhumbline Advisers | 0.00% | 35,034 | $93,535 | $90,037 | -$3,498 | -3.74% | |
| Rangeley Capital, Llc | 0.09% | 35,000 | $93,450 | $89,950 | -$3,500 | -3.75% | |
| Xtx Topco Ltd | 0.00% | 32,134 | $85,798 | $82,584 | -$3,214 | -3.75% | |
| Intrepid Financial Planning Group Llc | 0.03% | 30,150 | $80,501 | $77,486 | -$3,016 | -3.75% | |
| Y-Intercept (Hong Kong) Ltd | 0.00% | 29,540 | $78,872 | $75,918 | -$2,954 | -3.75% | |
| Quantinno Capital Management Lp | 0.00% | 26,769 | $71,473 | $68,796 | -$2,677 | -3.75% | |
| Ubs Group Ag | 0.00% | 25,765 | $68,793 | $66,216 | -$2,577 | -3.75% |
Frequently asked questions about ABOS
Who owns the most ABOS stock?
The largest holders of ABOS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ACUMEN PHARMACEUTICALS INC (ABOS).
Is ABOS widely held by superinvestors?
Many widely followed stocks like ABOS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ABOS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.