ACUMEN PHARMACEUTICALS INC (ABOS) Top 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 March 31, 2026. The institutional investors covered on this page collectively reported approximately $106.38M 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 $49.54M in its March 31, 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 $47.23M, representing an estimated loss of -4.66% 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, Alyeska Investment Group, L.P., 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
83
Total Reported Value
$106.38M
Largest Holder
Ra Capital Management, L.P.
Largest Position
$49.54M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
92
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. | 0.52% | 20,992,669 | $49,542,699 | $47,233,505 | -$2,309,194 | -4.66% | |
| Sands Capital Alternatives, Llc | 2.08% | 3,720,105 | $8,779,448 | $8,370,236 | -$409,212 | -4.66% | |
| Alyeska Investment Group, L.P. | 0.02% | 2,454,754 | $5,776,765 | $5,523,197 | -$253,569 | -4.39% | |
| Franklin Resources Inc | 0.00% | 2,305,096 | $5,440,027 | $5,186,466 | -$253,561 | -4.66% | |
| Adar1 Capital Management, Llc | 0.31% | 2,156,334 | $5,088,948 | $4,851,752 | -$237,197 | -4.66% | |
| Knollwood Investment Advisory, Llc | 0.39% | 1,628,510 | $3,843,284 | $3,664,148 | -$179,137 | -4.66% | |
| Vanguard Capital Management Llc | 0.00% | 1,506,277 | $3,554,814 | $3,389,123 | -$165,691 | -4.66% | |
| Fmr Llc | 0.00% | 1,157,346 | $2,731,337 | $2,604,029 | -$127,309 | -4.66% | |
| Ikarian Capital, Llc | 0.36% | 1,053,797 | $2,486,960 | $2,371,043 | -$115,917 | -4.66% | |
| Hudson Bay Capital Management Lp | 0.01% | 968,940 | $2,286,698 | $2,180,115 | -$106,583 | -4.66% | |
| Pathstone Holdings, Llc | 0.01% | 859,110 | $2,027,500 | $1,932,998 | -$94,503 | -4.66% | |
| Millennium Management Llc | 0.00% | 659,675 | $1,556,833 | $1,484,269 | -$72,564 | -4.66% | |
| Susquehanna International Group, Llp | 0.00% | 601,476 | $1,419,483 | $1,353,321 | -$66,162 | -4.66% | |
| Two Sigma Investments, Lp | 0.00% | 530,812 | $1,252,716 | $1,194,327 | -$58,389 | -4.66% | |
| Laurion Capital Management Lp | 0.12% | 525,444 | $1,240,048 | $1,182,249 | -$57,799 | -4.66% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 473,946 | $1,118,513 | $1,066,379 | -$52,135 | -4.66% |
| Geode Capital Management, Llc | 0.00% | 416,238 | $982,755 | $936,536 | -$46,220 | -4.70% | |
| Bank Of America Corp | 0.00% | 320,216 | $755,710 | $720,486 | -$35,224 | -4.66% | |
| Boothbay Fund Management, Llc | 0.01% | 273,012 | $644,308 | $614,277 | -$30,031 | -4.66% | |
| Goldman Sachs Group Inc | 0.00% | 206,683 | $487,772 | $465,037 | -$22,735 | -4.66% | |
| Vanguard Fiduciary Trust Co | 0.00% | 199,226 | $470,173 | $448,259 | -$21,915 | -4.66% | |
| Marshall Wace, Llp | 0.00% | 192,889 | $455,218 | $434,000 | -$21,218 | -4.66% | |
| Blackrock, Inc. | 0.00% | 178,326 | $420,849 | $401,234 | -$19,616 | -4.66% | |
| Bridgeway Capital Management, Llc | 0.01% | 176,171 | $415,764 | $396,385 | -$19,379 | -4.66% | |
| State Street Corp | 0.00% | 151,728 | $358,078 | $341,388 | -$16,690 | -4.66% | |
| Morgan Stanley | 0.00% | 144,584 | $341,219 | $325,314 | -$15,905 | -4.66% | |
| Qube Research & Technologies Ltd | 0.00% | 120,388 | $284,116 | $270,873 | -$13,243 | -4.66% | |
| Dimensional Fund Advisors Lp | 0.00% | 119,756 | $281,763 | $269,451 | -$12,312 | -4.37% | |
| Catalyst Financial Partners Llc | 0.02% | 89,699 | $211,690 | $201,823 | -$9,867 | -4.66% | |
| Jane Street Group, Llc | 0.00% | 89,661 | $211,599 | $201,737 | -$9,862 | -4.66% | |
| Pfg Investments, Llc | 0.01% | 80,850 | $190,806 | $181,913 | -$8,894 | -4.66% | |
| Northern Trust Corp | 0.00% | 75,212 | $177,500 | $169,227 | -$8,273 | -4.66% | |
| Point72 Asset Management, L.P. | 0.00% | 67,375 | $159,005 | $151,594 | -$7,411 | -4.66% | |
| Prospera Financial Services Inc | 0.00% | 50,000 | $118,000 | $112,500 | -$5,500 | -4.66% | |
| Catalyst Funds Management Pty Ltd | 0.02% | 45,600 | $107,616 | $102,600 | -$5,016 | -4.66% | |
| Verdad Advisers, Lp | 0.10% | 37,278 | $87,976 | $83,876 | -$4,101 | -4.66% | |
| Ubs Group Ag | 0.00% | 37,146 | $87,665 | $83,579 | -$4,087 | -4.66% | |
| Rangeley Capital, Llc | 0.09% | 35,000 | $82,600 | $78,750 | -$3,850 | -4.66% | |
| Barclays Plc | 0.00% | 30,679 | $72,402 | $69,028 | -$3,374 | -4.66% | |
| Intrepid Financial Planning Group Llc | 0.03% | 30,150 | $71,154 | $67,838 | -$3,317 | -4.66% | |
| Omers Administration Corp | 0.00% | 28,600 | $67,496 | $64,350 | -$3,146 | -4.66% | |
| Axq Capital, Lp | 0.01% | 28,487 | $67,229 | $64,096 | -$3,133 | -4.66% | |
| Independent Advisor Alliance | 0.00% | 19,000 | $44,840 | $42,750 | -$2,090 | -4.66% | |
| Pinnacle Associates Ltd | 0.00% | 18,020 | $42,527 | $40,545 | -$1,982 | -4.66% | |
| Pinnacle Wealth Management Advisory Group, Llc | 0.00% | 18,020 | $42,527 | $40,545 | -$1,982 | -4.66% | |
| American Century Companies Inc | 0.00% | 17,929 | $42,312 | $40,340 | -$1,972 | -4.66% | |
| Simplex Trading, Llc | 0.00% | 17,414 | $41,097 | $39,182 | -$1,916 | -4.66% | |
| Factor Wealth Management Ltd | 0.01% | 16,500 | $38,940 | $37,125 | -$1,815 | -4.66% | |
| Captrust Financial Advisors | 0.00% | 15,757 | $37,187 | $35,453 | -$1,734 | -4.66% | |
| Brevan Howard Capital Management Lp | 0.00% | 15,385 | $36,309 | $34,616 | -$1,693 | -4.66% |
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.