Stock Ownership/RNA

ATRIUM THERAPEUTICS INC (RNA): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in RNA · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
16
13F filers
Aggregate Value
$24.8M
Across holders
Last Price
$13.62
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity7 increased6 reduced8 exited
Full exits: FARALLON CAPITAL MANAGEMENT LLC, Point72 Asset Management, L.P., Woodline Partners LP, Grantham, Mayo, Van Otterloo & Co. LLC, Fortress Investment Group LLC, MARSHALL WACE, LLP, Magnetar Financial LLC, Pentwater Capital Management LP
Institutional Holders of RNA
↗
16 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund345K$4.6M18.7%0.0%Added+$2.2MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund201K$2.7M10.9%0.0%Added+$130KQ2 2026
Schonfeld Strategic Advisors LLC
CIK 0001665241
Hedge Fund199K$2.7M10.8%0.0%Added+$490KQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund172K$2.3M9.3%0.0%Added—Q2 2026
Squarepoint Ops LLC
CIK 0001642575
Hedge Fund147K$2.0M8.0%0.0%Reduced$-1.1MQ2 2026
Bracebridge Capital, LLC
CIK 0001426486
Hedge Fund139K$1.9M7.6%0.0%Unchanged+$0Q2 2026
TUDOR INVESTMENT CORP ET AL
CIK 0000923093
Hedge Fund130K$1.7M7.0%0.0%Added+$783KQ2 2026
ExodusPoint Capital Management, LP
CIK 0001736225
Hedge Fund117K$1.6M6.4%0.0%Added+$1.4MQ2 2026
BALYASNY ASSET MANAGEMENT LLC
CIK 0001218710
Hedge Fund106K$1.4M5.7%0.0%Reduced$-1.7MQ2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 0001165408
Hedge Fund100K$1.3M5.4%0.0%Reduced$-1.1MQ2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$4.6M· 18.7% of total· 0.0% port· 345K sh· +$2.2M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$2.7M· 10.9% of total· 0.0% port· 201K sh· +$130K QoQ· Q2 2026
Schonfeld Strategic Advisors LLCAdded
Hedge Fund
$2.7M· 10.8% of total· 0.0% port· 199K sh· +$490K QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$2.3M· 9.3% of total· 0.0% port· 172K sh· — QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$2.0M· 8.0% of total· 0.0% port· 147K sh· $-1.1M QoQ· Q2 2026
Bracebridge Capital, LLCUnchanged
Hedge Fund
$1.9M· 7.6% of total· 0.0% port· 139K sh· +$0 QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$1.7M· 7.0% of total· 0.0% port· 130K sh· +$783K QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$1.6M· 6.4% of total· 0.0% port· 117K sh· +$1.4M QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCReduced
Hedge Fund
$1.4M· 5.7% of total· 0.0% port· 106K sh· $-1.7M QoQ· Q2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Reduced
Hedge Fund
$1.3M· 5.4% of total· 0.0% port· 100K sh· $-1.1M QoQ· Q2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$910K· 3.7% of total· 0.0% port· 68K sh· $-2.0M QoQ· Q2 2026
CAXTON ASSOCIATES LLPUnchanged
Hedge Fund
$595K· 2.4% of total· 0.0% port· 44K sh· +$0 QoQ· Q2 2026
Saba Capital Management, L.P.Unchanged
Hedge Fund
$533K· 2.2% of total· 0.0% port· 40K sh· +$0 QoQ· Q2 2026
Brevan Howard Capital Management LPReduced
Hedge Fund
$280K· 1.1% of total· 0.0% port· 21K sh· $-145K QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCAdded
Hedge Fund
$201K· 0.8% of total· 0.0% port· 15K sh· — QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$525· 0.0% of total· 0.0% port· 39 sh· +$121 QoQ· Q2 2026
1–10 of 16
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