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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.

13F holders, Q2 2026

Institutional positions in Atrium Therapeutics, Inc. as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
154
−7 vs. Q1 2026
Shares held
14.3M
−362.1K (−2.5%) vs. Q1 2026
Total value
$192.8M
−$3.70M (−1.9%) vs. Q1 2026
New holders
39
47 more added
Sold out
46
35 more reduced

2 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q1 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting RNA on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ2 2026: 154 institutions
Q1 2021: 0 institutionsQ2 2021: 0 institutionsQ3 2021: 0 institutionsQ4 2021: 0 institutionsQ1 2022: 0 institutionsQ2 2022: 0 institutionsQ3 2022: 0 institutionsQ4 2022: 0 institutionsQ1 2023: 0 institutionsQ2 2023: 0 institutionsQ3 2023: 0 institutionsQ4 2023: 0 institutionsQ1 2024: 0 institutionsQ2 2024: 0 institutionsQ3 2024: 0 institutionsQ4 2024: 0 institutionsQ1 2025: 0 institutionsQ2 2025: 0 institutionsQ3 2025: 0 institutionsQ4 2025: 0 institutionsQ1 2026: 163 institutionsQ2 2026: 154 institutions
Value heldQ2 2026: $192.8M
Q1 2021: $0Q2 2021: $0Q3 2021: $0Q4 2021: $0Q1 2022: $0Q2 2022: $0Q3 2022: $0Q4 2022: $0Q1 2023: $0Q2 2023: $0Q3 2023: $0Q4 2023: $0Q1 2024: $0Q2 2024: $0Q3 2024: $0Q4 2024: $0Q1 2025: $0Q2 2025: $0Q3 2025: $0Q4 2025: $0Q1 2026: $198.3MQ2 2026: $192.8M
Institutions holding RNA and their total value by quarter
QuarterHoldersValue
Q2 2026154$192.8M
Q1 2026163$198.3M
Q4 20250$0
Q3 20250$0
Q2 20250$0
Q1 20250$0
Q4 20240$0
Q3 20240$0
Q2 20240$0
Q1 20240$0
Q4 20230$0
Q3 20230$0
Q2 20230$0
Q1 20230$0
Q4 20220$0
Q3 20220$0
Q2 20220$0
Q1 20220$0
Q4 20210$0
Q3 20210$0
Q2 20210$0
Q1 20210$0

Institutions, Q2 2026

Shares, value and share of portfolio for each institution holding Atrium Therapeutics, Inc.; share changes are against Q1 2026.

Institutions holding RNA in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Group One Trading, L.P.3,575$48.1K0.00%−107−2.9%Reduced
Police & Firemen's Retirement System of New Jersey3,175$42.7K0.00%00.0%Unchanged
SRS Capital Advisors, Inc.3,128$42.1K0.00%+3,128New
New York State Common Retirement Fund2,749$37.0K0.00%00.0%Unchanged
Barclays PLC2,699$35.8K0.00%+604+28.8%Added
STRS Ohio2,600$35.0K0.00%00.0%Unchanged
Tower Research Capital LLC (TRC)1,716$23.1K0.00%−1,044−37.8%Reduced
Legal & General Group Plc1,422$19.1K0.00%−4,235−74.9%Reduced
Ameritas Investment Partners, Inc.950$12.8K0.00%00.0%Unchanged
Steward Partners Investment Advisory, LLC635$8.54K0.00%00.0%Unchanged
UBS Asset Management Americas Inc612$8.23K0.00%00.0%Unchanged
Royal Bank of Canada600$8.00K0.00%−35,098−98.3%Reduced
The PNC Financial Services Group, Inc.594$7.99K0.00%−349−37.0%Reduced
Keating Financial Advisory Services, Inc.531$7.14K0.00%+528+17,600.0%Added
PenderFund Capital Management Ltd.490$6.59K0.00%00.0%Unchanged
Covestor Ltd466$6.00K0.00%+453+3,484.6%Added
Eurizon Capital SGR S.p.A.287$3.92K0.00%00.0%Unchanged
Essential Partners LLC288$3.87K0.00%+288New
Allworth Financial LP281$3.78K0.00%+227+420.4%Added
Versant Capital Management, Inc265$3.56K0.00%+265New
EverSource Wealth Advisors, LLC230$3.09K0.00%+226+5,650.0%Added
FNY Investment Advisers, LLC260$3.00K0.00%+260New
True Wealth Design, LLC213$2.87K0.00%+212+21,200.0%Added
GAMMA Investing LLC195$2.62K0.00%−140−41.8%Reduced
California State Teachers Retirement System171$2.30K0.00%+171New
Rothschild Investment LLC162$2.18K0.00%+143+752.6%Added
AdvisorNet Financial, Inc139$1.87K0.00%00.0%Unchanged
Sterling Capital Management LLC125$1.68K0.00%+25+25.0%Added
Farther Finance Advisors, LLC120$1.62K0.00%+120New
Longfellow Investment Management Co LLC107$1.44K0.00%00.0%Unchanged
Nisa Investment Advisors, LLC77$1.03K0.00%−307−79.9%Reduced
Private Wealth Management Group, LLC75$1.01K0.00%+75New
TD Private Client Wealth LLC74$9950.00%+74New
Basecamp Wealth Advisors LLC56$7530.00%−293−84.0%Reduced
Fortitude Family Office, LLC50$6730.00%+50New
Zurcher Kantonalbank (Zurich Cantonalbank)49$6590.00%00.0%Unchanged
Wealth Enhancement Trust Services, Inc.40$5380.00%+40New
Rockefeller Capital Management L.P.39$5250.00%−103−72.5%Reduced
Bogart Wealth, LLC39$5250.00%+39New
Jones Financial Companies LLLP29$3830.00%00.0%Unchanged
Smartleaf Asset Management LLC25$3410.00%00.0%Unchanged
Danske Bank A/S21$2820.00%00.0%Unchanged
Global Retirement Partners, LLC21$2820.00%+21New
US Bancorp13$1750.00%−284−95.6%Reduced
Clearstead Advisors, LLC11$1490.00%+11New
Pinnacle Wealth Planning Services, Inc.10$1350.00%−24−70.6%Reduced
SJS Investment Consulting Inc.9$1220.00%+9New
JPL Wealth Management, LLC6$810.00%+6New
Advisor Group Holdings, Inc.5$670.00%−53−91.4%Reduced
Torren Management, LLC4$540.00%00.0%Unchanged
Parallel Advisors, LLC2$270.00%−74−97.4%Reduced
Truvestments Capital LLC1$130.00%00.0%Unchanged
Centerpoint Advisors, LLC5$00.00%00.0%Unchanged
Avion Wealth43$00.00%+43New
Ra Capital Management, L.P.0$00.00%−864,102−100.0%Sold out
Pentwater Capital Management LP0$00.00%−602,649−100.0%Sold out
O'Connor Alternative Investments LLC0$00.00%−578,011−100.0%Sold out
Farallon Capital Management, L.L.C.0$00.00%−349,360−100.0%Sold out
Bellevue Group AG0$00.00%−263,096−100.0%Sold out
CNH Partners LLC0$00.00%−179,713−100.0%Sold out
Neuberger Berman Group LLC0$00.00%−69,294−100.0%Sold out
Quarry LP0$00.00%−66,651−100.0%Sold out
Westchester Capital Management, LLC0$00.00%−55,236−100.0%Sold out
Highbridge Capital Management LLC0$00.00%−40,986−100.0%Sold out
Fifth Lane Capital, LP0$00.00%−35,999−100.0%Sold out
Marshall Wace, LLP0$00.00%−33,691−100.0%Sold out
Woodline Partners LP0$00.00%−28,845−100.0%Sold out
Cannon Global Investment Management, LLC0$00.00%−25,087−100.0%Sold out
Point72 Asset Management, L.P.0$00.00%−22,708−100.0%Sold out
Fortress Investment Group LLC0$00.00%−22,033−100.0%Sold out
Grantham, Mayo, Van Otterloo & Co. LLC0$00.00%−15,444−100.0%Sold out
Susquehanna Portfolio Strategies, LLC0$00.00%−13,110−100.0%Sold out
Public Sector Pension Investment Board0$00.00%−12,882−100.0%Sold out
AlphaGrep UK Ltd0$00.00%−11,870−100.0%Sold out
Susquehanna International Group, LLP0$00.00%−11,343−100.0%Sold out
Magnetar Financial LLC0$00.00%−10,512−100.0%Sold out
Centiva Capital, LP0$00.00%−5,895−100.0%Sold out
Diadema Partners LP0$00.00%−2,512−100.0%Sold out
MAI Capital Management0$00.00%−1,293−100.0%Sold out
Natixis0$00.00%−1,292−100.0%Sold out
Federation des caisses Desjardins du Quebec0$00.00%−810−100.0%Sold out
Public Employees Retirement Association of Colorado0$00.00%−780−100.0%Sold out
Mint Tower Capital Management B.V.0$00.00%−781−100.0%Sold out
Van Eck Associates Corp0$00.00%−472−100.0%Sold out
KBC Group NV0$00.00%−337−100.0%Sold out
Mitsubishi UFJ Kokusai Asset Management Co., Ltd.0$00.00%−331−100.0%Sold out
Quadrant Capital Group LLC0$00.00%−316−100.0%Sold out
Persistent Asset Partners Ltd0$00.00%−283−100.0%Sold out
GWM Advisors LLC0$00.00%−123−100.0%Sold out
Westside Investment Management, Inc.0$00.00%−120−100.0%Sold out
Fifth Third Bancorp0$00.00%−59−100.0%Sold out
Assetmark, Inc0$00.00%−34−100.0%Sold out
Advisory Services Network, LLC0$00.00%−12−100.0%Sold out
Northwestern Mutual Wealth Management Co0$00.00%−4−100.0%Sold out
Massmutual Trust Co FSB0$00.00%−2−100.0%Sold out
Bell Investment Advisors, Inc0$00.00%−2−100.0%Sold out
Root Financial Partners, LLC0$00.00%−1−100.0%Sold out
Bare Financial Services, Inc0$00.00%−1−100.0%Sold out
Cornerstone Financial Management LLC0$00.00%−1−100.0%Sold out
Bessemer Group Inc0$00.00%−9−100.0%Sold out