Atrium Therapeutics, Inc.

RNANASDAQ

$7.84-0.30 (-3.69%)as of Oct 2, 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

Atrium Therapeutics, Inc. price and activity chart data

Showing the 1Y range: Feb 27, 2026 to Oct 2, 2026. Price (-46.8%). 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
Sessa Capital IM, L.P.	8.77%	$20.2M	0.34%	Not reported
BlackRock, Inc.	8.46%	$19.5M	0.00%	Not reported
CRCM LP	7.50%	$17.3M	5.68%	New Not reported
Vanguard Capital Management LLC	4.27%	$9.83M	0.00%	Not reported
TIG Advisors, LLC	3.28%	$7.55M	0.33%	Not reported
Arbiter Partners Capital Management LLC	3.05%	$7.03M	1.85%	Add 127.21%
Cantor Fitzgerald, L. P.	3.00%	$6.91M	0.04%	Not reported
Geode Capital Management, LLC	2.26%	$5.21M	0.00%	Not reported
Two Sigma Investments, LP	2.02%	$4.65M	0.00%	Not reported
Goldman Sachs Group Inc	1.81%	$4.17M	0.00%	Not reported
683 Capital Management, LLC	1.75%	$4.04M	0.20%	Not reported
State Street Corp	1.59%	$3.66M	0.00%	Not reported
Slotnik Capital, LLC	1.39%	$3.2M	0.83%	Add 31.33%
Weiss Asset Management LP	1.28%	$2.96M	0.03%	Reduce 8.71%
Millennium Management LLC	1.17%	$2.7M	0.00%	Not reported
Schonfeld Strategic Advisors LLC	1.16%	$2.68M	0.01%	Not reported
AQR Capital Management LLC	1.01%	$2.32M	0.00%	Not reported
Nexpoint Asset Management, L.P.	0.88%	$2.02M	0.13%	Not reported
Polar Asset Management Partners Inc.	0.88%	$2.02M	0.03%	Not reported
Squarepoint Ops LLC	0.86%	$1.97M	0.00%	Not reported
Bracebridge Capital, LLC	0.81%	$1.87M	0.03%	Not reported
Nomura Holdings Inc	0.80%	$1.85M	0.00%	Add 0.01%
Yakira Capital Management, Inc.	0.78%	$1.79M	0.51%	Not reported
Bank of America Corp	0.78%	$1.79M	0.00%	Not reported
Charles Schwab Investment Management Inc	0.76%	$1.75M	0.00%	Not reported
Tudor Investment Corp Et Al	0.76%	$1.74M	0.00%	Not reported
DAFNA Capital Management LLC	0.75%	$1.72M	0.33%	New Not reported
Creek Drive Management Group LLC	0.75%	$1.72M	0.83%	Add 6.33%
Norges Bank	0.74%	$1.7M	0.00%	Not reported
Anson Funds Management LP	0.73%	$1.68M	0.10%	Not reported
Northern Trust Corp	0.70%	$1.61M	0.00%	Not reported
ExodusPoint Capital Management, LP	0.69%	$1.58M	0.01%	Not reported
Trium Capital LLP	0.66%	$1.52M	0.94%	Not reported
Vanguard Fiduciary Trust Co	0.64%	$1.48M	0.00%	Not reported
Jane Street Group, LLC	0.64%	$1.48M	0.00%	Not reported
Athos Capital Ltd	0.63%	$1.45M	0.52%	Not reported
Balyasny Asset Management L.P.	0.62%	$1.42M	0.00%	Not reported
Marble Bar Asset Management LLP	0.61%	$1.4M	0.97%	Reduce 29.35%
Vanguard Portfolio Management LLC	0.59%	$1.36M	0.00%	Not reported
Adage Capital Partners GP, L.L.C.	0.58%	$1.35M	0.00%	Reduce 45.53%
BlueCrest Capital Management Ltd	0.58%	$1.35M	0.04%	Not reported
Credit Industriel Et Commercial	0.52%	$1.21M	0.08%	Add 290.10%
Groupe la Francaise	0.47%	$1.08M	0.01%	Add 170.30%
FIL Ltd	0.45%	$1.03M	0.00%	Reduce 2.55%
Caption Management, LLC	0.44%	$1.01M	0.00%	Not reported
Citadel Advisors LLC	0.40%	$910K	0.00%	Not reported
Manufacturers Life Insurance Company, the	0.37%	$845K	0.00%	Not reported
ADAR1 Capital Management, LLC	0.34%	$776K	0.04%	Not reported
Jacobs Levy Equity Management, Inc	0.32%	$726K	0.00%	Not reported
Oddo BHF Asset Management Sas	0.26%	$606K	0.03%	Not reported

50 of 142 holders

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