Acumen Pharmaceuticals, Inc.

ABOSNASDAQ

$2.13+0.09 (+4.41%)as of Oct 5, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

Acumen Pharmaceuticals, Inc. price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 5, 2026. Price (+9.8%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
Ra Capital Management, L.P.	29.03%	$56.1M	0.49%	Not reported
Sands Capital Alternatives, LLC	5.14%	$9.93M	1.62%	Not reported
BlackRock, Inc.	3.44%	$6.65M	0.00%	Not reported
Alyeska Investment Group, L.P.	3.39%	$6.55M	0.02%	Not reported
ADAR1 Capital Management, LLC	2.92%	$5.64M	0.26%	Reduce 2.09%
Vanguard Capital Management LLC	2.31%	$4.46M	0.00%	Not reported
Knollwood Investment Advisory, LLC	2.25%	$4.35M	0.39%	Not reported
Geode Capital Management, LLC	1.58%	$3.05M	0.00%	Not reported
Ikarian Capital, LLC	1.46%	$2.81M	0.30%	Not reported
Hudson Bay Capital Management LP	1.32%	$2.55M	0.01%	Not reported
Pathstone Holdings, LLC	1.19%	$2.29M	0.01%	Not reported
Renaissance Technologies LLC	0.93%	$1.8M	0.00%	Not reported
Two Sigma Investments, LP	0.86%	$1.66M	0.00%	Not reported
State Street Corp	0.83%	$1.6M	0.00%	Not reported
Northern Trust Corp	0.50%	$963K	0.00%	Not reported
Vanguard Portfolio Management LLC	0.44%	$857K	0.00%	Not reported
Dimensional Fund Advisors LP	0.40%	$779K	0.00%	Not reported
Vanguard Fiduciary Trust Co	0.40%	$778K	0.00%	Not reported
Bank of America Corp	0.38%	$734K	0.00%	Not reported
Boothbay Fund Management, LLC	0.38%	$729K	0.01%	Not reported
Acadian Asset Management LLC	0.37%	$718K	0.00%	Not reported
Nomura Holdings Inc	0.26%	$507K	0.00%	Not reported
Goldman Sachs Group Inc	0.25%	$491K	0.00%	Not reported
Bridgeway Capital Management, LLC	0.24%	$470K	0.01%	Not reported
Morgan Stanley	0.19%	$365K	0.00%	Not reported
Susquehanna International Group, LLP	0.17%	$337K	0.00%	Not reported
Bank of New York Mellon Corp	0.17%	$332K	0.00%	Not reported
Charles Schwab Investment Management Inc	0.16%	$307K	0.00%	Not reported
PFG Investments, LLC	0.13%	$252K	0.01%	Add 16.57%
Catalyst Financial Partners LLC	0.12%	$239K	0.02%	Not reported
Nuveen, LLC	0.09%	$169K	0.00%	Not reported
Millennium Management LLC	0.08%	$162K	0.00%	Not reported
Squarepoint Ops LLC	0.07%	$140K	0.00%	Not reported
Citadel Advisors LLC	0.07%	$136K	0.00%	Not reported
Prospera Financial Services Inc	0.07%	$134K	0.00%	Not reported
Wells Fargo & Company	0.07%	$133K	0.00%	Not reported
Marshall Wace, LLP	0.07%	$128K	0.00%	Not reported
Deutsche Bank Ag\	0.06%	$123K	0.00%	Not reported
Verdad Advisers, LP	0.06%	$119K	0.11%	Not reported
Barclays PLC	0.05%	$106K	0.00%	Not reported
Qube Research & Technologies Ltd	0.05%	$103K	0.00%	Not reported
New York State Common Retirement Fund	0.05%	$96.7K	0.00%	Not reported
Rhumbline Advisers	0.05%	$93.5K	0.00%	Not reported
Rangeley Capital, LLC	0.05%	$93.5K	0.09%	Not reported
XTX Topco Ltd	0.04%	$85.8K	0.00%	Not reported
Intrepid Financial Planning Group LLC	0.04%	$80.5K	0.03%	Not reported
Y-Intercept (Hong Kong) Ltd	0.04%	$78.9K	0.00%	Not reported
Quantinno Capital Management LP	0.04%	$71.5K	0.00%	New Not reported
UBS Group AG	0.04%	$68.8K	0.00%	Not reported
Invesco Ltd.	0.03%	$65.7K	0.00%	Not reported

50 of 91 holders

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