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Acumen Pharmaceuticals (ABOS) Institutional Ownership

Acumen Pharmaceuticals logo
$2.07 -0.15 (-6.76%)
Closing price 10/1/2026 04:00 PM Eastern
Extended Trading
$2.07 0.00 (-0.10%)
As of 10/1/2026 07:56 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Acumen Pharmaceuticals (NASDAQ:ABOS)

Current
Institutional Ownership
Percentage
71.01%
Number of
Institutional Buyers
(last 12 months)
24
Total
Institutional Inflows
(last 12 months)
$19.66M
Number of
Institutional Sellers
(last 12 months)
15
Total
Institutional Outflows
(last 12 months)
$4.98M
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ABOS Institutional Buying and Selling by Quarter

Acumen Pharmaceuticals Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026Squarepoint Ops LLC52,351$140K0.0%+248.7%0.072%
9/8/2026Spark Investment Management LLC14,700$39K0.1%N/A0.020%
8/21/2026AXQ Capital LP24,426$65K0.0%-14.3%0.034%
8/20/2026Two Sigma Securities LLC11,892$32K0.0%N/A0.016%
8/17/2026Bank of America Corp DE274,781$734K0.0%N/A0.380%
8/14/2026ADAR1 Capital Management LLC2,111,334$5.64M0.3%N/A2.923%
8/7/2026BlackRock Inc.2,490,115$6.65M0.0%N/A3.447%
8/7/2026Deutsche Bank AG46,132$123K0.0%N/A0.064%
8/6/2026Bank of New York Mellon Corp124,377$332K0.0%N/A0.172%
5/19/2026Bank of America Corp DE320,216$756K0.0%+33.3%0.443%
5/18/2026ADAR1 Capital Management LLC2,156,334$5.09M0.3%+142.0%2.985%
5/15/2026Rangeley Capital LLC35,000$83K0.1%N/A0.048%
5/15/2026OMERS ADMINISTRATION Corp28,600$67K0.0%+27.4%0.040%
5/14/2026Renaissance Technologies LLC473,946$1.12M0.0%+12.0%0.656%
5/14/2026Sei Investments Co.11,564$27K0.0%N/A0.016%
5/7/2026Dimensional Fund Advisors LP119,756$282K0.0%+144.1%0.166%
4/27/2026PFG Investments LLC80,850$191K0.0%+325.5%0.112%
4/16/2026SG Americas Securities LLC719,257$1.70M0.0%+79.3%0.996%
2/18/2026XTX Topco Ltd49,563$105K0.0%N/A0.082%
2/18/2026Ikarian Capital LLC254,312$537K0.0%-4.3%0.420%
2/18/2026Quadrature Capital Ltd49,046$103K0.0%N/A0.081%
2/18/2026Millennium Management LLC584,143$1.23M0.0%-2.9%0.964%
2/18/2026Boothbay Fund Management LLC39,585$84K0.0%-22.4%0.065%
2/18/2026Bridgeway Capital Management LLC170,171$359K0.0%-10.5%0.281%
2/16/2026OMERS ADMINISTRATION Corp22,454$47K0.0%N/A0.037%
2/13/2026Marshall Wace LLP20,907$44K0.0%N/A0.035%
2/13/2026State Street Corp100,178$211K0.0%-6.1%0.165%
2/12/2026Jane Street Group LLC142,123$300K0.0%-31.4%0.235%
2/12/2026Renaissance Technologies LLC423,100$893K0.0%-27.6%0.699%
2/12/2026Dimensional Fund Advisors LP49,062$104K0.0%+12.7%0.081%
2/10/2026Goldman Sachs Group Inc.117,851$249K0.0%-19.9%0.195%
2/9/2026Geode Capital Management LLC410,206$866K0.0%+2.9%0.677%
2/9/2026Prospera Financial Services Inc50,000$106K0.0%N/A0.083%
2/4/2026Independent Advisor Alliance19,000$40K0.0%N/A0.031%
1/26/2026PFG Investments LLC19,000$40K0.0%+65.2%0.031%
12/15/2025Hudson Bay Capital Management LP725,004$1.24M0.0%-12.1%1.197%
11/17/2025Jacobs Levy Equity Management Inc.16,001$27K0.0%N/A0.026%
11/17/2025Susquehanna International Group LLP214,440$367K0.0%+26.5%0.354%
11/17/2025Qube Research & Technologies Ltd32,881$56K0.0%-42.9%0.054%
11/17/2025Millennium Management LLC601,716$1.03M0.0%-69.1%0.993%
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11/17/2025Bank of America Corp DE213,729$365K0.0%+45.4%0.353%
11/14/2025ADAR1 Capital Management LLC891,183$1.52M0.1%-2.7%1.471%
11/14/2025Bridgeway Capital Management LLC190,171$325K0.0%+65.1%0.314%
11/13/2025Pathstone Holdings LLC859,110$1.47M0.0%-18.8%1.418%
11/13/2025Franklin Resources Inc.2,305,096$3.94M0.0%-25.1%3.806%
11/7/2025Vanguard Group Inc.1,651,472$2.82M0.0%-2.2%2.727%
10/23/2025SG Americas Securities LLC403,878$691K0.0%N/A0.667%
8/19/2025Marex Group plc33,300$39K0.0%N/A0.055%
8/18/2025Hudson Bay Capital Management LP825,004$957K0.0%+7.1%1.362%
8/15/2025Hudson Bay Capital Management LP825,004$957K0.0%+7.1%1.362%
8/15/2025Bank of America Corp DE147,009$171K0.0%-7.5%0.243%
8/14/2025Jane Street Group LLC175,670$204K0.0%+1,526.0%0.290%
8/14/2025Qube Research & Technologies Ltd57,559$67K0.0%+160.0%0.095%
8/13/2025Marshall Wace LLP137,943$160K0.0%N/A0.228%
8/12/2025Franklin Resources Inc.3,077,039$3.57M0.0%-2.1%5.080%
8/8/2025Geode Capital Management LLC396,626$460K0.0%-54.0%0.655%
8/1/2025Y Intercept Hong Kong Ltd250,848$291K0.0%N/A0.414%
6/27/2025Goldman Sachs Group Inc.196,207$216K0.0%-10.5%0.324%
5/16/2025Goldman Sachs Group Inc.196,207$216K0.0%-10.5%0.324%
5/16/2025AQR Capital Management LLC41,735$46K0.0%N/A0.069%
5/16/2025ADAR1 Capital Management LLC146,183$161K0.0%+55.0%0.241%
5/12/2025Nuveen LLC78,446$86K0.0%N/A0.130%
5/12/2025Invesco Ltd.127,798$141K0.0%+544.1%0.211%
2/17/2025Two Sigma Investments LP301,268$518K0.0%-2.7%0.501%
2/17/2025Two Sigma Advisers LP499,100$858K0.0%+6.4%0.831%
2/17/2025Millennium Management LLC1,344,745$2.31M0.0%-26.7%2.238%
2/17/2025Deutsche Bank AG96,995$167K0.0%+468.7%0.161%
2/17/2025Bank of America Corp DE148,668$256K0.0%+7.2%0.247%
2/14/2025Jane Street Group LLC30,740$53K0.0%-116.1%0.051%
2/14/2025Susquehanna Fundamental Investments LLC14,731$25K0.0%N/A0.025%
2/14/2025Rock Springs Capital Management LP1,838,916$3.16M0.1%-20.0%3.061%
2/14/2025Tower Research Capital LLC TRC20,624$35K0.0%+427.5%0.034%
2/14/2025Dimensional Fund Advisors LP98,016$169K0.0%+73.3%0.163%
2/13/2025Barclays PLC93,082$161K0.0%+50.1%0.155%
2/13/2025Renaissance Technologies LLC257,213$442K0.0%-16.0%0.428%
2/13/2025ADAR1 Capital Management LLC94,294$162K0.0%N/A0.157%
2/12/2025Franklin Resources Inc.3,273,633$5.63M0.0%-7.8%5.449%
2/12/2025JPMorgan Chase & Co.937,908$1.61M0.0%+1,387.2%1.561%
2/11/2025Clune & Associates LTD.16,500$28K0.0%N/A0.027%
2/11/2025Intech Investment Management LLC18,847$32K0.0%N/A0.031%
2/6/2025Charles Schwab Investment Management Inc.126,747$218K0.0%+16.6%0.211%
1/30/2025Rhumbline Advisers53,076$91K0.0%-40.0%0.088%
1/17/2025SG Americas Securities LLC25,631$44K0.0%+44.2%0.043%
12/26/2024JPMorgan Chase & Co.63,066$156K0.0%+252.8%0.105%
11/27/2024Franklin Resources Inc.3,549,069$8.34M0.0%+5.4%5.907%
11/19/2024Barclays PLC61,997$154K0.0%+189.1%0.103%
11/16/2024Geode Capital Management LLC864,528$2.14M0.0%+6.5%1.439%
11/15/2024Barclays PLC61,997$154K0.0%+189.1%0.103%
11/15/2024State Street Corp516,406$1.28M0.0%+18.3%0.860%
11/13/2024FMR LLC2,028,117$5.03M0.0%+0.3%3.376%
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11/13/2024The Manufacturers Life Insurance Company52,333$130K0.0%-12.8%0.087%
10/3/2024SG Americas Securities LLC17,772$44K0.0%N/A0.030%
8/16/2024Murchinson Ltd.56,250$136K0.0%N/A0.094%
8/15/2024Millennium Management LLC1,954,085$4.73M0.0%-25.7%3.252%
8/14/2024Murchinson Ltd.56,250$136K0.0%N/A0.094%
8/12/2024Marathon Trading Investment Management LLC26,298$64K0.0%-56.2%0.044%
8/9/2024Renaissance Technologies LLC338,100$818K0.0%N/A0.563%
8/9/2024Dimensional Fund Advisors LP56,548$137K0.0%-8.4%0.094%
8/8/2024American Century Companies Inc.45,444$110K0.0%+31.3%0.076%
8/1/2024Rhumbline Advisers52,323$127K0.0%N/A0.087%


ABOS Institutional Ownership - Frequently Asked Questions

During the previous two years, 54 institutional investors and hedge funds held shares of Acumen Pharmaceuticals. The most heavily invested institutionals were BlackRock Inc. ($6.65M), ADAR1 Capital Management LLC ($5.64M), FMR LLC ($5.03M), Franklin Resources Inc. ($3.94M), Rock Springs Capital Management LP ($3.16M), Vanguard Group Inc. ($2.82M), and SG Americas Securities LLC ($1.70M).Learn more on Acumen Pharmaceuticals' institutional investors.

71.01% of Acumen Pharmaceuticals' stock is owned by institutional investors. Learn more on ABOS's institutional investor holdings.

Of the 43 institutional investors that purchased Acumen Pharmaceuticals' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: ADAR1 Capital Management LLC ($3.52M), BlackRock Inc. ($2.49M), JPMorgan Chase & Co. ($920.03K), SG Americas Securities LLC ($747.72K), Bank of America Corp DE ($431.51K), Jane Street Group LLC ($386.01K), and Y Intercept Hong Kong Ltd ($250.85K).

Institutional investors have bought a total of 7,852,129 shares in the last 24 months. This purchase volume represents approximately $19.66M in transactions.

Of the 15 institutional investors that sold Acumen Pharmaceuticals' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Millennium Management LLC ($1.37M), Franklin Resources Inc. ($771.94K), Pathstone Holdings LLC ($199.42K), Renaissance Technologies LLC ($161.19K), Hudson Bay Capital Management LP ($100K), Jane Street Group LLC ($65.12K), and Vanguard Group Inc. ($37.88K).

Institutional investors have sold a total of 2,833,978 shares in the last 24 months. This volume of shares sold represents approximately $4.98M in transactions.


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Institutional ownership data for NASDAQ:ABOS is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 9/9/2026. New 13F filings are added each quarter as they're published.
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