ATRIUM THERAPEUTICS INC (RNA) Institutional Shareholders
ATRIUM THERAPEUTICS INC (RNA) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $192.62M in RNA holdings during the latest filing period.
Sessa Capital Im, L.P. is currently the largest disclosed institutional shareholder of RNA tracked by InsiderSet, reporting ownership valued at approximately $20.18M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $13.42M, representing an estimated loss of -33.46% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 54% of the total disclosed RNA value among the investors covered in this analysis. Major shareholders include Sessa Capital Im, L.P., Price T Rowe Associates Inc, Blackrock, Inc., and several other long-term asset managers with concentrated positions in ATRIUM THERAPEUTICS INC (RNA).
This page ranks the largest institutional RNA shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
147
Total Reported Value
$192.62M
Largest Holder
Sessa Capital Im, L.P.
Largest Position
$20.18M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
71
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Sessa Capital Im, L.P. | 0.35% | 1,500,000 | $20,175,000 | $13,425,000 | -$6,750,000 | -33.46% | |
| Price T Rowe Associates Inc | 0.00% | 1,472,984 | $19,813,000 | $13,183,207 | -$6,629,793 | -33.46% | |
| Blackrock, Inc. | 0.00% | 1,447,476 | $19,468,551 | $12,954,910 | -$6,513,641 | -33.46% | |
| Vanguard Capital Management Llc | 0.00% | 730,831 | $9,829,677 | $6,540,937 | -$3,288,740 | -33.46% | |
| Crcm Lp | 5.67% | 641,539 | $8,628,700 | $5,741,774 | -$2,886,926 | -33.46% | |
| Tig Advisors, Llc | 0.35% | 561,533 | $7,552,619 | $5,025,720 | -$2,526,899 | -33.46% | |
| Geode Capital Management, Llc | 0.00% | 386,929 | $5,205,392 | $3,463,015 | -$1,742,377 | -33.47% | |
| Two Sigma Investments, Lp | 0.00% | 345,481 | $4,646,719 | $3,092,055 | -$1,554,664 | -33.46% | |
| Goldman Sachs Group Inc | 0.00% | 310,341 | $4,174,086 | $2,777,552 | -$1,396,534 | -33.46% | |
| 683 Capital Management, Llc | 0.37% | 300,000 | $4,035,000 | $2,685,000 | -$1,350,000 | -33.46% | |
| State Street Corp | 0.00% | 271,762 | $3,655,199 | $2,432,270 | -$1,222,929 | -33.46% | |
| Arbiter Partners Capital Management | Paul Isaac | 1.88% | 261,288 | $3,514,324 | $2,338,528 | -$1,175,796 | -33.46% |
| Cantor Fitzgerald, L. P. | 0.07% | 256,917 | $3,455,534 | $2,299,407 | -$1,156,127 | -33.46% | |
| Slotnik Capital, Llc | 0.89% | 237,637 | $3,196,218 | $2,126,851 | -$1,069,367 | -33.46% | |
| Weiss Asset Management Lp | 0.03% | 219,730 | $2,955,368 | $1,966,583 | -$988,785 | -33.46% | |
| Millennium Management Llc | 0.00% | 200,559 | $2,697,519 | $1,795,003 | -$902,516 | -33.46% | |
| Schonfeld Strategic Advisors Llc | 0.01% | 199,158 | $2,678,673 | $1,782,464 | -$896,209 | -33.46% | |
| Aqr Capital Management Llc | 0.00% | 172,235 | $2,316,561 | $1,541,503 | -$775,058 | -33.46% | |
| Nexpoint Asset Management, L.P. | 0.13% | 150,025 | $2,017,836 | $1,342,724 | -$675,112 | -33.46% | |
| Polar Asset Management Partners Inc. | 0.04% | 150,000 | $2,017,500 | $1,342,500 | -$675,000 | -33.46% | |
| Squarepoint Ops Llc | 0.00% | 146,743 | $1,973,693 | $1,313,350 | -$660,343 | -33.46% | |
| Bracebridge Capital, Llc | 0.41% | 139,239 | $1,872,765 | $1,246,189 | -$626,576 | -33.46% | |
| Janus Henderson Group Plc | 0.00% | 139,973 | $1,871,370 | $1,252,758 | -$618,612 | -33.06% | |
| Nomura Holdings Inc | 0.01% | 137,394 | $1,847,949 | $1,229,676 | -$618,273 | -33.46% | |
| Yakira Capital Management, Inc. | 0.53% | 133,047 | $1,789,482 | $1,190,771 | -$598,711 | -33.46% | |
| Bank Of America Corp | 0.00% | 132,833 | $1,786,603 | $1,188,855 | -$597,748 | -33.46% | |
| Charles Schwab Investment Management Inc | 0.00% | 130,217 | $1,751,419 | $1,165,442 | -$585,977 | -33.46% | |
| Tudor Investment Corp Et Al | 0.01% | 129,591 | $1,742,999 | $1,159,839 | -$583,160 | -33.46% | |
| Dafna Capital Management Llc | 0.33% | 128,000 | $1,721,600 | $1,145,600 | -$576,000 | -33.46% | |
| Creek Drive Management Group Llc | 1.06% | 127,600 | $1,716,220 | $1,142,020 | -$574,200 | -33.46% | |
| Norges Bank | 0.00% | 126,575 | $1,702,434 | $1,132,846 | -$569,588 | -33.46% | |
| Anson Funds Management Lp | 0.15% | 125,000 | $1,681,250 | $1,118,750 | -$562,500 | -33.46% | |
| Northern Trust Corp | 0.00% | 119,781 | $1,611,055 | $1,072,040 | -$539,015 | -33.46% | |
| Exoduspoint Capital Management, Lp | 0.01% | 117,275 | $1,577,349 | $1,049,611 | -$527,738 | -33.46% | |
| Trium Capital Llp | 0.96% | 113,278 | $1,523,589 | $1,013,838 | -$509,751 | -33.46% | |
| Td Asset Management Inc | 0.00% | 111,200 | $1,495,640 | $995,240 | -$500,400 | -33.46% | |
| Vanguard Fiduciary Trust Co | 0.00% | 109,961 | $1,478,975 | $984,151 | -$494,824 | -33.46% | |
| Jane Street Group, Llc | 0.00% | 109,810 | $1,476,945 | $982,799 | -$494,146 | -33.46% | |
| Athos Capital Ltd | 0.52% | 107,965 | $1,452,000 | $966,287 | -$485,713 | -33.45% | |
| Awm Investment Company, Inc. | 0.13% | 107,500 | $1,445,875 | $962,125 | -$483,750 | -33.46% | |
| Balyasny Asset Management L.P. | 0.00% | 105,875 | $1,424,019 | $947,581 | -$476,438 | -33.46% | |
| Marble Bar Asset Management Llp | 0.97% | 103,849 | $1,396,769 | $929,449 | -$467,320 | -33.46% | |
| Vanguard Portfolio Management Llc | 0.00% | 101,195 | $1,361,073 | $905,695 | -$455,378 | -33.46% | |
| Adage Capital Partners Gp, L.L.C. | 0.00% | 100,000 | $1,345,000 | $895,000 | -$450,000 | -33.46% | |
| Bluecrest Capital Management Ltd | 0.06% | 100,000 | $1,345,000 | $895,000 | -$450,000 | -33.46% | |
| Credit Industriel Et Commercial | 0.13% | 89,723 | $1,206,774 | $803,021 | -$403,753 | -33.46% | |
| Groupe La Francaise | 0.01% | 80,273 | $1,079,672 | $718,443 | -$361,229 | -33.46% | |
| Fil Ltd | 0.00% | 76,500 | $1,028,925 | $684,675 | -$344,250 | -33.46% | |
| Caption Management, Llc | 0.04% | 75,277 | $1,012,476 | $673,729 | -$338,747 | -33.46% | |
| Citadel Advisors Llc | 0.00% | 67,639 | $909,745 | $605,369 | -$304,376 | -33.46% |
Frequently asked questions about RNA
Who owns the most RNA stock?
The largest holders of RNA are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ATRIUM THERAPEUTICS INC (RNA).
Is RNA widely held by superinvestors?
Many widely followed stocks like RNA appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly RNA is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.