13F

Stock

Atrium Therapeutics, Inc.

RNA · held by 160 managers

Reported value

$175.7M

Holders

160

+155 new · −0 exited

Holders’ est. mark

Need a prior quarter

Largest holder

$16.1M

BlackRock, Inc.

Notable conviction

Share of each notable manager’s 13F book.

Who holds it

Notable only
InvestorSharesValueEst. markChange
BlackRock, Inc.1.21M$16.1MNew
RA CAPITAL MANAGEMENT, L.P.864.1K$11.6MNew
VANGUARD CAPITAL MANAGEMENT LLC626.9K$8.38MHeld
TIG Advisors, LLC607.6K$8.12MNew
Pentwater Capital Management LP602.6K$8.06MNew
O'Connor Alternative Investments LLC578K$7.73MHeld
Sessa Capital IM, L.P.551.4K$7.37MNew
GOLDMAN SACHS GROUP INC349.9K$4.68MNew
FARALLON CAPITAL MANAGEMENT LLC349.4K$4.67MNew
VANGUARD PORTFOLIO MANAGEMENT LLC344.4K$4.6MHeld
GEODE CAPITAL MANAGEMENT, LLC319.8K$4.28MNew
683 Capital Management, LLC300K$4.01MNew
Bellevue Group AG263.1K$3.52MNew
State Street257.1K$3.44MNew
Weiss Asset Management LP240.7K$3.22MNew
CANTOR FITZGERALD, L. P.235.6K$3.15MNew
Balyasny Asset Management L.P.235.1K$3.14MNew
Squarepoint Ops LLC231.5K$3.09MNew
Arbiter Partners Capital Management LLC230K$3.08MNew
MILLENNIUM MANAGEMENT LLC190.9K$2.55MNew
ADAGE CAPITAL PARTNERS GP, L.L.C.183.6K$2.45MNew
Slotnik Capital, LLC180.9K$2.42MNew
AQR Arbitrage LLC179.7K$2.4MNew
TWO SIGMA INVESTMENTS, LP178.6K$2.39MNew
MORGAN STANLEY165K$2.21MNew
Schonfeld Strategic Advisors LLC162.8K$2.18MNew
NEXPOINT ASSET MANAGEMENT, L.P.150K$2.01MNew
Marble Bar Asset Management LLP147K$1.97MNew
JANUS HENDERSON GROUP PLC140K$1.87MNew
Bracebridge Capital, LLC139.2K$1.86MNew
NOMURA HOLDINGS INC137.4K$1.84MNew
BANK OF AMERICA CORP /DE/136.2K$1.82MNew
Yakira Capital Management, Inc.126.6K$1.69MNew
Creek Drive Management Group LLC120K$1.6MNew
CHARLES SCHWAB INVESTMENT MANAGEMENT INC116.6K$1.56MNew
TD Asset Management Inc111.2K$1.49MNew
Citadel109.9K$1.47MNew
Caption Management, LLC103.6K$1.39MNew
NORTHERN TRUST CORP98.6K$1.32MNew
VANGUARD FIDUCIARY TRUST CO95.1K$1.27MHeld
FIL Ltd78.5K$1.05MNew
ExodusPoint Capital Management, LP77.4K$1.04MNew
TUDOR INVESTMENT CORP ET AL71.4K$954.1KNew
Polar Asset Management Partners Inc.70K$935.9KNew
NEUBERGER BERMAN GROUP LLC69.3K$926.5KNew
Quarry LP66.7K$891.1KNew
MANUFACTURERS LIFE INSURANCE COMPANY, THE62.4K$834KNew
ADAR1 Capital Management, LLC57.7K$771KNew
Westchester Capital Management, LLC55.2K$738.5KNew
AWM Investment Company, Inc.50K$668.5KNew
Twin Securities, Inc.49.9K$667.3KNew
UBS Group AG49.8K$666KNew
ODDO BHF ASSET MANAGEMENT SAS45.1K$602.9KNew
CAXTON ASSOCIATES LLP44.2K$591.4KNew
ALETHEA CAPITAL MANAGEMENT, LLC43.8K$585KNew
Bank of New York Mellon Corp43.7K$584.2KNew
CANADA PENSION PLAN INVESTMENT BOARD42K$561.1KNew
HIGHBRIDGE CAPITAL MANAGEMENT LLC41K$555.4KNew
Saba Capital Management, L.P.39.6K$530KNew
FIFTH LANE CAPITAL, LP36K$481.3KNew
ROYAL BANK OF CANADA35.7K$477KNew
KENNEDY CAPITAL MANAGEMENT LLC34K$454.3KNew
MARSHALL WACE, LLP33.7K$450.4KNew
LMR Partners LLP32.5K$434.5KNew
Brevan Howard Capital Management LP31.6K$423.1KNew
Groupe la Francaise29.7K$397.1KNew
Fidelity29.3K$391.6KNew
Woodline Partners LP28.8K$385.7KNew
Nuveen, LLC25.3K$338.4KNew
Cannon Global Investment Management, LLC25.1K$335.4KNew
CREDIT INDUSTRIEL ET COMMERCIAL23K$307.5KNew
Point72 Asset Management, L.P.22.7K$303.6KNew
Fortress Investment Group LLC22K$294.6KNew
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND20.6K$275.3KNew
Fractal Investments LLC20K$267.4KNew
JANE STREET GROUP, LLC20K$266.8KNew
Grantham, Mayo, Van Otterloo & Co. LLC15.4K$206.5KNew
RHUMBLINE ADVISERS15K$199.9KNew
AlphaCentric Advisors LLC13.3K$177.6KNew
Susquehanna Portfolio Strategies, LLC13.1K$175.3KNew
ALLIANCEBERNSTEIN L.P.13K$173.4KNew
PUBLIC SECTOR PENSION INVESTMENT BOARD12.9K$172.2KNew
Quantinno Capital Management LP12.5K$166.5KNew
JPMORGAN CHASE & CO12K$163.1KNew
WELLS FARGO & COMPANY/MN11.4K$152.6KNew
SUSQUEHANNA INTERNATIONAL GROUP, LLP11.3K$151.7KNew
Magnetar Financial LLC10.5K$140.5KNew
Invesco Ltd.10.2K$136.3KNew
DEUTSCHE BANK AG\10K$134KNew
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.9.49K$126.9KNew
MetLife Investment Management, LLC8.85K$118.3KNew
BNP PARIBAS FINANCIAL MARKETS8.27K$110.5KNew
Centiva Capital, LP5.89K$78.8KNew
Legal & General Group Plc5.66K$75.6KNew
Vanguard Global Advisers, LLC5.58K$74.7KHeld
Russell Investments Group, Ltd.3.84K$51.3KNew
GROUP ONE TRADING LLC3.68K$49.2KNew
Erste Asset Management GmbH3.6K$48.8KNew
Walleye Trading LLC3.63K$48.5KNew
Police & Firemen's Retirement System of New Jersey3.17K$42.5KNew
Tower Research Capital LLC (TRC)2.76K$36.9KNew
NEW YORK STATE COMMON RETIREMENT FUND2.75K$36.8KNew
STRS OHIO2.6K$34.8KNew
DIADEMA PARTNERS LP2.51K$33.6KNew
BARCLAYS PLC2.1K$28KNew
PRICE T ROWE ASSOCIATES INC /MD/1.55M$20.8KNew
MAI Capital Management1.29K$17.3KNew
NATIXIS1.29K$17.3KNew
Ameritas Investment Partners, Inc.950$12.7KNew
PNC Financial Services Group, Inc.943$12.6KNew
Federation des caisses Desjardins du Quebec810$10.8KNew
CITIGROUP INC638$8.53KNew
Steward Partners Investment Advisory, LLC635$8.49KNew
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC612$8.18KNew
PenderFund Capital Management Ltd.490$6.55KNew
NISA INVESTMENT ADVISORS, LLC384$5.13KNew
GAMMA Investing LLC335$4.48KNew
Mitsubishi UFJ Asset Management Co., Ltd.331$4.42KNew
QUADRANT CAPITAL GROUP LLC316$4.22KNew
US BANCORP \DE\297$3.97KNew
Eurizon Capital SGR S.p.A.287$3.91KNew
Persistent Asset Partners Ltd283$3.78KNew
Rockefeller Capital Management L.P.142$1.9KNew
AdvisorNet Financial, Inc139$1.86KNew
Westside Investment Management, Inc.120$1.61KNew
Athos Capital Ltd108K$1.44KNew
LONGFELLOW INVESTMENT MANAGEMENT CO LLC107$1.43KNew
Sterling Capital Management LLC100$1.34KNew
Parallel Advisors, LLC76$1.02KNew
FIFTH THIRD BANCORP59$794New
OSAIC HOLDINGS, INC.58$775New
Allworth Financial LP54$722New
Zurcher Kantonalbank (Zurich Cantonalbank)49$655New
Pinnacle Wealth Planning Services, Inc.34$455New
ASSETMARK, INC34$455New
JONES FINANCIAL COMPANIES LLLP29$384New
Smartleaf Asset Management LLC25$339New
CWM, LLC21$281New
DANSKE BANK A/S21$280New
ROTHSCHILD INVESTMENT LLC19$254New
Vestcor Inc17.5K$234New
Advisory Services Network, LLC12$160New
NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO4$53New
EverSource Wealth Advisors, LLC4$53New
Torren Management, LLC4$53New
Keating Financial Advisory Services, Inc.3$40New
Bell Investment Advisors, Inc2$27New
MassMutual Private Wealth & Trust, FSB2$27New
True Wealth Design, LLC1$14New
Truvestments Capital LLC1$13New
Root Financial Partners, LLC1$13New
Cornerstone Financial Management LLC1$13New
Bare Financial Services, Inc1$13New
Mint Tower Capital Management B.V.781$10New
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO780$10New
VAN ECK ASSOCIATES CORP472$6New
KBC Group NV337$5New
BESSEMER GROUP INC9$0New
Centerpoint Advisors, LLC5$0New
Covestor Ltd13$0New

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.