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Livermore
Livermore
ZHEN

Atrium Therapeutics, Inc.

RNA
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0002093101

No open-market purchases or sales by Atrium Therapeutics, Inc. insiders were filed in the last 90 days; 154 institutions reported holding it in 13F filings for Q2 2026, worth $192.8M in total; no superinvestor holds it.

Q1 2026 vs. Q4 2025

How the institutions holding Atrium Therapeutics, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026All holders in Q4 2025

13F holders of RNA: Q4 2025 compared with Q1 2026
MeasureQ4 2025Q1 2026Change
Holders0163+163
Shares014.8M+14.8M
Value$0$198.3M+$198.3M

New holders (163)

Institutions that held Atrium Therapeutics, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Showing the largest 100 of 163 by value.

Institutions new to RNA in Q1 2026
InstitutionSharesValue% of portfolio
Price T Rowe Associates Inc1,553,210$20.8M0.00%
BlackRock, Inc.1,205,291$16.1M0.00%
Ra Capital Management, L.P.864,102$11.6M0.12%
Vanguard Capital Management LLC626,869$8.38M0.00%
TIG Advisors, LLC607,552$8.12M0.39%
Pentwater Capital Management LP602,649$8.06M0.06%
O'Connor Alternative Investments LLC578,011$7.73M0.41%
Sessa Capital IM, L.P.551,391$7.37M0.14%
Goldman Sachs Group Inc349,950$4.68M0.00%
Farallon Capital Management, L.L.C.349,360$4.67M0.03%
Vanguard Portfolio Management LLC344,369$4.60M0.00%
Geode Capital Management, LLC319,831$4.28M0.00%
683 Capital Management, LLC300,000$4.01M0.37%
Bellevue Group AG263,096$3.52M0.08%
State Street Corp257,086$3.44M0.00%
Weiss Asset Management LP240,701$3.22M0.06%
Cantor Fitzgerald, L. P.235,637$3.15M0.11%
Balyasny Asset Management LLC235,115$3.14M0.01%
Squarepoint Ops LLC231,466$3.09M0.01%
Arbiter Partners Capital Management LLC230,000$3.08M2.09%
Millennium Management LLC190,859$2.55M0.00%
Adage Capital Partners GP, L.L.C.183,580$2.45M0.00%
Slotnik Capital, LLC180,945$2.42M0.72%
CNH Partners LLC179,713$2.40M0.04%
Two Sigma Investments, LP178,560$2.39M0.00%
Morgan Stanley165,036$2.21M0.00%
Schonfeld Strategic Advisors LLC162,759$2.18M0.02%
Highland Capital Management Fund Advisors, L.P.150,025$2.01M0.14%
Marble Bar Asset Management LLP147,000$1.97M1.93%
Janus Henderson Group PLC139,973$1.87M0.00%
Bracebridge Capital, LLC139,239$1.86M0.33%
Nomura Holdings Inc137,380$1.84M0.02%
Bank of America Corp136,248$1.82M0.00%
Yakira Capital Management, Inc.126,645$1.69M0.50%
Creek Drive Management Group LLC120,000$1.60M1.01%
Charles Schwab Investment Management Inc116,598$1.56M0.00%
TD Asset Management Inc111,200$1.49M0.00%
Citadel Advisors LLC109,936$1.47M0.00%
Athos Capital Ltd107,965$1.44M0.45%
Caption Management, LLC103,592$1.39M0.07%
Northern Trust Corp98,585$1.32M0.00%
Vanguard Fiduciary Trust Co95,128$1.27M0.00%
FIL Ltd78,500$1.05M0.00%
ExodusPoint Capital Management, LP77,442$1.04M0.01%
Tudor Investment Corp Et Al71,359$954.1K0.01%
Polar Asset Management Partners Inc.70,000$935.9K0.02%
Neuberger Berman Group LLC69,294$926.5K0.00%
Quarry LP66,651$891.1K0.18%
Manufacturers Life Insurance Company, The62,379$834.0K0.00%
ADAR1 Capital Management, LLC57,688$771.0K0.05%
Westchester Capital Management, LLC55,236$738.5K0.04%
AWM Investment Company, Inc.50,000$668.5K0.07%
Twin Securities, Inc.49,913$667.3K0.33%
UBS Group AG49,814$666.0K0.00%
Oddo BHF Asset Management SAS45,090$602.9K0.02%
Caxton Associates LLP44,230$591.4K0.01%
Alethea Capital Management, LLC43,758$585.0K0.31%
Bank of New York Mellon Corp43,697$584.2K0.00%
Canada Pension Plan Investment Board41,970$561.1K0.00%
Highbridge Capital Management LLC40,986$555.4K0.04%
Saba Capital Management, L.P.39,640$530.0K0.02%
Fifth Lane Capital, LP35,999$481.3K0.58%
Royal Bank of Canada35,698$477.0K0.00%
Kennedy Capital Management, Inc.33,977$454.3K0.01%
Marshall Wace, LLP33,691$450.4K0.00%
LMR Partners LLP32,500$434.5K0.00%
Brevan Howard Capital Management LP31,644$423.1K0.00%
Groupe la Francaise29,698$397.1K0.01%
FMR LLC29,292$391.6K0.00%
Woodline Partners LP28,845$385.7K0.00%
Nuveen, LLC25,307$338.4K0.00%
Cannon Global Investment Management, LLC25,087$335.4K0.81%
Credit Industriel Et Commercial23,000$307.5K0.05%
Point72 Asset Management, L.P.22,708$303.6K0.00%
Fortress Investment Group LLC22,033$294.6K0.08%
Healthcare of Ontario Pension Plan Trust Fund20,590$275.3K0.00%
Fractal Investments LLC20,000$267.4K0.03%
Jane Street Group, LLC19,955$266.8K0.00%
Vestcor Inc17,499$234.0K0.01%
Grantham, Mayo, Van Otterloo & Co. LLC15,444$206.5K0.00%
Rhumbline Advisers14,953$199.9K0.00%
AlphaCentric Advisors LLC13,286$177.6K0.18%
Susquehanna Portfolio Strategies, LLC13,110$175.3K0.00%
Alliancebernstein L.P.12,970$173.4K0.00%
Public Sector Pension Investment Board12,882$172.2K0.00%
Quantinno Capital Management LP12,454$166.5K0.00%
JPMorgan Chase & Co12,038$163.1K0.00%
AlphaGrep UK Ltd11,870$158.7K0.05%
Wells Fargo & Company11,416$152.6K0.00%
Susquehanna International Group, LLP11,343$151.7K0.00%
Magnetar Financial LLC10,512$140.5K0.00%
Invesco Ltd.10,193$136.3K0.00%
Deutsche Bank AG10,019$134.0K0.00%
Mirae Asset Global ETFs Holdings Ltd.9,488$126.9K0.00%
MetLife Investment Management8,845$118.3K0.00%
BNP Paribas Arbitrage, SA8,267$110.5K0.00%
Centiva Capital, LP5,895$78.8K0.00%
Legal & General Group Plc5,657$75.6K0.00%
Vanguard Global Advisers, LLC5,585$74.7K0.00%
Russell Investments Group, Ltd.3,839$51.3K0.00%

Sold out (0)

Institutions that held Atrium Therapeutics, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

None.