ATRIUM THERAPEUTICS INC (RNA)
Institutional ownership reported to the SEC as of Q2 2026, across 2 quarters.
152
Reporting holders
$208.4M
Reported value
85.0%
Of shares outstanding
6.2%
Held as options
+0
Holder change
Institutions report 14,533,612 shares against 17,105,643 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| CRCM LP | $25.1M | 1,866,333 | 5.60% | new | NEW |
| Sessa Capital IM, L.P. | $20.2M | 1,500,000 | 0.34% | 2q | +172.0%+$12.8M |
| BlackRock, Inc. | $19.5M | 1,447,476 | 0.00% | 2q | +20.1%+$3.3M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $11.3M | options only | 0.00% | 2q | OPTIONS |
| VANGUARD CAPITAL MANAGEMENT LLC | $9.8M | 730,831 | 0.00% | 2q | +16.6%+$1.4M |
| TIG Advisors, LLC | $7.6M | 561,533 | 0.33% | 2q | -7.6%-$619.0K |
| Arbiter Partners Capital Management LLC | $7.0M | 522,576 | 1.85% | 2q | +127.2%+$3.9M |
| CANTOR FITZGERALD, L. P. | $6.9M | 513,834 | 0.04% | 2q | +118.1%+$3.7M |
| GEODE CAPITAL MANAGEMENT, LLC | $5.2M | 386,929 | 0.00% | 2q | +21.0%+$902.7K |
| TWO SIGMA INVESTMENTS, LP | $4.6M | 345,481 | 0.00% | 2q | +93.5%+$2.2M |
| GOLDMAN SACHS GROUP INC | $4.2M | 310,341 | 0.00% | 2q | -11.3%-$532.7K |
| 683 Capital Management, LLC | $4.0M | 300,000 | 0.20% | 2q | HELD |
| STATE STREET CORP | $3.7M | 271,762 | 0.00% | 2q | +5.7%+$197.4K |
| Slotnik Capital, LLC | $3.2M | 237,637 | 0.83% | 2q | +31.3%+$762.5K |
| Weiss Asset Management LP | $3.0M | 219,730 | 0.03% | 2q | -8.7%-$282.1K |
| MILLENNIUM MANAGEMENT LLC | $2.7M | 200,559 | 0.00% | 2q | +5.1%+$130.5K |
| Schonfeld Strategic Advisors LLC | $2.7M | 199,158 | 0.01% | 2q | +22.4%+$489.6K |
| AQR CAPITAL MANAGEMENT LLC | $2.3M | 172,235 | 0.00% | new | NEW |
| NEXPOINT ASSET MANAGEMENT, L.P. | $2.0M | 150,025 | 0.13% | 2q | HELD |
| Polar Asset Management Partners Inc. | $2.0M | 150,000 | 0.03% | 2q | +114.3%+$1.1M |
| Squarepoint Ops LLC | $2.0M | 146,743 | 0.00% | 2q | -36.6%-$1.1M |
| Bracebridge Capital, LLC | $1.9M | 139,239 | 0.03% | 2q | HELD |
| NOMURA HOLDINGS INC | $1.8M | 137,394 | 0.00% | 2q | HELD |
| Caption Management, LLC | $1.8M | 75,277 | 0.01% | 2q | -27.3%-$688.4K |
| Yakira Capital Management, Inc. | $1.8M | 133,047 | 0.51% | 2q | +5.1%+$86.1K |
| BANK OF AMERICA CORP /DE/ | $1.8M | 132,833 | 0.00% | 2q | -2.5%-$45.9K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.8M | 130,217 | 0.00% | 2q | +11.7%+$183.2K |
| Sixth Street Partners Management Company, L.P. | $1.8M | 130,217 | 0.00% | new | NEW |
| TUDOR INVESTMENT CORP ET AL | $1.7M | 129,591 | 0.00% | 2q | +81.6%+$783.2K |
| DAFNA Capital Management LLC | $1.7M | 128,000 | 0.33% | new | NEW |
| Creek Drive Management Group LLC | $1.7M | 127,600 | 0.83% | 2q | +6.3%+$102.2K |
| NORGES BANK | $1.7M | 126,575 | 0.00% | new | NEW |
| Anson Funds Management LP | $1.7M | 125,000 | 0.10% | new | NEW |
| NORTHERN TRUST CORP | $1.6M | 119,781 | 0.00% | 2q | +21.5%+$285.1K |
| ExodusPoint Capital Management, LP | $1.6M | 117,275 | 0.01% | 2q | +51.4%+$535.8K |
| Trium Capital LLP | $1.5M | 113,278 | 0.94% | new | NEW |
| TD Asset Management Inc | $1.5M | 111,200 | 0.00% | 2q | HELD |
| VANGUARD FIDUCIARY TRUST CO | $1.5M | 109,961 | 0.00% | 2q | +15.6%+$199.5K |
| JANE STREET GROUP, LLC | $1.5M | 109,810 | 0.00% | 2q | +450.3%+$1.2M |
| AWM Investment Company, Inc. | $1.4M | 107,500 | 0.13% | 2q | +115.0%+$773.4K |
| Balyasny Asset Management L.P. | $1.4M | 105,875 | 0.00% | 2q | -55.0%-$1.7M |
| Marble Bar Asset Management LLP | $1.4M | 103,849 | 0.97% | 2q | -29.4%-$580.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $1.4M | 101,195 | 0.00% | 2q | -70.6%-$3.3M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $1.3M | 100,000 | 0.00% | 2q | -45.5%-$1.1M |
| BlueCrest Capital Management Ltd | $1.3M | 100,000 | 0.04% | new | NEW |
| CREDIT INDUSTRIEL ET COMMERCIAL | $1.2M | 89,723 | 0.08% | 2q | +290.1%+$897.4K |
| FIL Ltd | $1.0M | 76,500 | 0.00% | 2q | -2.5%-$26.9K |
| CITADEL ADVISORS LLC | $909.7K | 67,639 | 0.00% | 2q | -38.5%-$568.9K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $845.4K | 62,853 | 0.00% | 2q | +0.8%+$6.4K |
| ADAR1 Capital Management, LLC | $775.9K | 57,688 | 0.04% | 2q | HELD |
| FRANKLIN RESOURCES INC | $762.6K | 56,699 | 0.00% | new | NEW |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $726.2K | 53,992 | 0.00% | new | NEW |
| ODDO BHF ASSET MANAGEMENT SAS | $606.5K | 45,090 | 0.03% | 2q | HELD |
| CAXTON ASSOCIATES LLP | $594.9K | 44,230 | 0.01% | 2q | HELD |
| ALETHEA CAPITAL MANAGEMENT, LLC | $588.5K | 43,758 | 0.24% | 2q | HELD |
| CANADA PENSION PLAN INVESTMENT BOARD | $564.5K | 41,970 | 0.00% | 2q | HELD |
| MORGAN STANLEY | $564.1K | 41,942 | 0.00% | 2q | -74.6%-$1.7M |
| Saba Capital Management, L.P. | $533.2K | 39,640 | 0.01% | 2q | HELD |
| Bank of New York Mellon Corp | $527.9K | 39,252 | 0.00% | 2q | -10.2%-$59.8K |
| Y-Intercept (Hong Kong) Ltd | $472.1K | 35,103 | 0.01% | new | NEW |
| KENNEDY CAPITAL MANAGEMENT LLC | $470.5K | 34,979 | 0.01% | 2q | +2.9%+$13.5K |
| GROUP ONE TRADING LLC | $451.6K | 3,575 | 0.00% | 2q | -2.9%-$13.5K |
| FMR LLC | $451.0K | 33,532 | 0.00% | 2q | +14.5%+$57.0K |
| Moran Wealth Management, LLC | $448.2K | 33,320 | 0.01% | new | NEW |
| BOUSSARD & GAVAUDAN GESTION SAS | $447.2K | 32,845 | 0.02% | new | FIRST |
| LMR Partners LLP | $437.1K | 32,500 | 0.00% | 2q | HELD |
| LOS ANGELES CAPITAL MANAGEMENT LLC | $423.4K | 31,477 | 0.00% | new | NEW |
| Nuveen, LLC | $417.9K | 31,071 | 0.00% | 2q | +22.8%+$77.5K |
| Jump Financial, LLC | $417.2K | 31,017 | 0.00% | new | NEW |
| Walleye Trading LLC | $401.9K | 3,978 | 0.00% | 2q | +9.6%+$35.4K |
| Quantinno Capital Management LP | $368.8K | 27,418 | 0.00% | 2q | +120.2%+$201.3K |
| Twin Securities, Inc. | $356.7K | 26,517 | 0.16% | 2q | -46.9%-$314.7K |
| Odyssean, LLC | $285.6K | 21,233 | 0.05% | new | NEW |
| Brevan Howard Capital Management LP | $280.2K | 20,834 | 0.00% | 2q | -34.2%-$145.4K |
| Fractal Investments LLC | $269.0K | 20,000 | 0.03% | 2q | HELD |
| UBS Group AG | $263.2K | 19,572 | 0.00% | 2q | -60.7%-$406.8K |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $250.0K | 18,590 | 0.00% | 2q | -9.7%-$26.9K |
| WELLS FARGO & COMPANY/MN | $234.7K | 17,451 | 0.00% | 2q | -23.6%-$72.4K |
| ALLIANCEBERNSTEIN L.P. | $228.8K | 17,110 | 0.00% | 2q | +31.9%+$55.4K |
| RHUMBLINE ADVISERS | $223.0K | 16,579 | 0.00% | 2q | +10.9%+$21.9K |
| BLUEFIN CAPITAL MANAGEMENT, LLC | $215.3K | 16,011 | 0.05% | new | NEW |
| RENAISSANCE TECHNOLOGIES LLC | $201.4K | 14,971 | 0.00% | new | NEW |
| DEUTSCHE BANK AG\ | $201.3K | 14,967 | 0.00% | 2q | +49.4%+$66.6K |
| Invesco Ltd. | $190.6K | 14,174 | 0.00% | 2q | +39.1%+$53.5K |
| Jupiter Topco LLC | $185.6K | 13,833 | 0.00% | new | FIRST |
| AlphaCentric Advisors LLC | $181.3K | 13,478 | 0.15% | 2q | +1.4%+$2.6K |
| AXQ CAPITAL, LP | $153.0K | 11,377 | 0.02% | new | NEW |
| KESTRA PRIVATE WEALTH SERVICES, LLC | $139.5K | 10,370 | 0.00% | new | NEW |
| MetLife Investment Management, LLC | $138.3K | 10,283 | 0.00% | 2q | +16.3%+$19.3K |
| Corsicana & Co. | $132.1K | 9,820 | 0.06% | new | NEW |
| JPMORGAN CHASE & CO | $128.1K | 9,388 | 0.00% | 2q | -22.0%-$36.2K |
| BNP PARIBAS FINANCIAL MARKETS | $106.3K | 7,901 | 0.00% | 2q | -4.4%-$4.9K |
| MERCER GLOBAL ADVISORS INC /ADV | $106.1K | 7,891 | 0.00% | new | NEW |
| CITIGROUP INC | $89.9K | 6,685 | 0.00% | 2q | +947.8%+$81.3K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $88.8K | 6,602 | 0.00% | 2q | -30.4%-$38.8K |
| Vanguard Global Advisers, LLC | $75.1K | 5,585 | 0.00% | 2q | HELD |
| Russell Investments Group, Ltd. | $60.2K | 4,475 | 0.00% | 2q | +16.6%+$8.6K |
| Skandinaviska Enskilda Banken AB (publ) | $59.2K | 4,400 | 0.00% | new | NEW |
| Erste Asset Management GmbH | $49.1K | 3,600 | 0.00% | 2q | HELD |
| Quantbot Technologies LP | $48.6K | 3,614 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | T. Rowe Price Associates, Inc. | 8.6% |
| 2026-08-14 | 13G | Sessa Capital IM, L.P.with 1 co-filers | 8.8% |
| 2026-08-14 | 13G/A | RA Capital Management, L.P.with 3 co-filers | 0.0% |
| 2026-07-27 | 13G/A | BlackRock, Inc. | 6.6% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 152 | $208.4M | 14,533,612 | 40 | 43 | 35 | 6.2% |
| Q1 2026 | 152 | $192.6M | 13,162,443 | 149 | 0 | 0 | 8.6% |