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

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.