Sionna Therapeutics, Inc. - SION
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 5 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | History | Reduced | 9,905,045 | 407,493 | 4.17% | 3.79% | 1 | -540,277 | -5.17% | Q4 2025 | Feb 17, 2026 |
| TPG GP A, LLC | History | No change | 6,744,962 | 277,487 | 10.33% | 10.8% | 2 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| ORBIMED ADVISORS LLC | History | Reduced | 3,561,655 | 146,526 | 2.99% | 2.56% | 3 | -143,304 | -3.87% | Q4 2025 | Feb 17, 2026 |
| VIKING GLOBAL INVESTORS LP | History | No change | 3,195,181 | 131,449 | 0.35% | 0.24% | 4 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Atlas Venture Life Science Advisors, LLC | History | Reduced | 2,995,602 | 123,239 | 14.24% | 14.13% | 5 | -619,925 | -17.15% | Q4 2025 | Feb 13, 2026 |
| Enavate Sciences GP, LLC | History | No change | 2,478,030 | 101,946 | 20.12% | 22.25% | 6 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Added to | 1,291,599 | 53,136 | 0.0% | 0.0% | 7 | +446,994 | 52.92% | Q4 2025 | Feb 12, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 1,231,819 | 50,677 | 0.0% | 0.0% | 8 | -746,807 | -37.74% | Q4 2025 | Feb 11, 2026 |
| VANGUARD GROUP INC | History | Added to | 1,184,951 | 48,748 | 0.0% | 0.0% | 9 | +41,797 | 3.66% | Q4 2025 | Jan 29, 2026 |
| PERCEPTIVE ADVISORS LLC | History | No change | 1,179,098 | 48,508 | 0.86% | 1.0% | 10 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| JENNISON ASSOCIATES LLC | History | Added to | 1,115,278 | 45,882 | 0.03% | 0.02% | 11 | +117,903 | 11.82% | Q4 2025 | Jan 30, 2026 |
| CITADEL ADVISORS LLC | History | Added to | 1,087,325 | 44,732 | 0.01% | 0.0% | 12 | +1,051,402 | 2926.82% | Q4 2025 | Feb 17, 2026 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | History | No change | 970,590 | 39,930 | 0.51% | 0.44% | 13 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Aberdeen Group plc | History | Reduced | 839,960 | 34,555 | 0.05% | 0.04% | 14 | -110,587 | -11.63% | Q4 2025 | Jan 16, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | History | Added to | 831,373 | 34,203 | 0.0% | 0.0% | 15 | +193,613 | 30.36% | Q4 2025 | Feb 17, 2026 |
| STATE STREET CORP | History | Added to | 693,395 | 28,526 | 0.0% | 0.0% | 16 | +453,196 | 188.68% | Q4 2025 | Feb 13, 2026 |
| EVENTIDE ASSET MANAGEMENT, LLC | History | New | 639,045 | 26,290 | 0.41% | — | 17 | +639,045 | New | Q4 2025 | Feb 13, 2026 |
| BAKER BROS. ADVISORS LP | History | No change | 400,000 | 16,456 | 0.1% | 0.09% | 18 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 380,042 | 15,638 | 0.0% | 0.0% | 19 | +63,478 | 20.05% | Q4 2025 | Feb 09, 2026 |
| Siren, L.L.C. | History | Reduced | 300,000 | 12,342 | 0.37% | 0.37% | 20 | -25,000 | -7.69% | Q4 2025 | Feb 13, 2026 |
| Soleus Capital Management, L.P. | History | Reduced | 268,500 | 11,046 | 0.41% | 0.61% | 21 | -145,000 | -35.07% | Q4 2025 | Feb 12, 2026 |
| Kalehua Capital Management LLC | History | New | 197,072 | 8,107 | 8.02% | — | 22 | +197,072 | New | Q4 2025 | Feb 13, 2026 |
| SUPERSTRING CAPITAL MANAGEMENT LP | History | New | 180,593 | 7,429 | 3.98% | — | 23 | +180,593 | New | Q4 2025 | Feb 17, 2026 |
| FRANKLIN RESOURCES INC | History | Reduced | 175,483 | 7,219 | 0.0% | 0.0% | 24 | -66,664 | -27.53% | Q4 2025 | Feb 11, 2026 |
| Alyeska Investment Group, L.P. | History | Reduced | 136,222 | 5,604 | 0.02% | 0.02% | 25 | -50,000 | -26.85% | Q4 2025 | Feb 13, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | History | Added to | 123,686 | 5,088 | 0.0% | 0.0% | 26 | +12,190 | 10.93% | Q4 2025 | Feb 13, 2026 |
| Artia Global Partners LP | History | New | 119,741 | 4,926 | 0.7% | — | 27 | +119,741 | New | Q4 2025 | Feb 17, 2026 |
| TD ASSET MANAGEMENT INC | History | Added to | 113,352 | 4,663 | 0.0% | 0.0% | 28 | +26,270 | 30.17% | Q4 2025 | Feb 10, 2026 |
| NORTHERN TRUST CORP | History | Added to | 112,116 | 4,612 | 0.0% | 0.0% | 29 | +14,405 | 14.74% | Q4 2025 | Feb 17, 2026 |
| Invesco Ltd. | History | New | 111,162 | 4,573 | 0.0% | — | 30 | +111,162 | New | Q4 2025 | Feb 19, 2026 |
| AMERIPRISE FINANCIAL INC | History | Reduced | 101,643 | 4,181 | 0.0% | 0.0% | 31 | -51,508 | -33.63% | Q4 2025 | Feb 17, 2026 |
| Rock Springs Capital Management LP | History | No change | 99,429 | 4,090 | 0.21% | 0.17% | 32 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| UBS Group AG | History | Added to | 89,177 | 3,668 | 0.0% | 0.0% | 33 | +42,511 | 91.1% | Q4 2025 | Jan 29, 2026 |
| DRIEHAUS CAPITAL MANAGEMENT LLC | History | No change | 83,850 | 3,449 | 0.02% | 0.02% | 34 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 80,546 | 3,313 | 0.0% | 0.0% | 35 | -133,539 | -62.38% | Q4 2025 | Feb 17, 2026 |
| Ensign Peak Advisors, Inc | History | New | 79,862 | 3,285 | 0.01% | — | 36 | +79,862 | New | Q4 2025 | Feb 12, 2026 |
| Longaeva Partners L.P. | History | Added to | 79,729 | 3,280 | 0.28% | 0.26% | 37 | +18,272 | 29.73% | Q4 2025 | Feb 17, 2026 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | History | New | 69,424 | 2,872 | 0.0% | — | 38 | +69,424 | New | Q4 2025 | Feb 13, 2026 |
| SEVEN GRAND MANAGERS, LLC | History | New | 50,000 | 2,057 | 0.16% | — | 39 | +50,000 | New | Q4 2025 | Feb 10, 2026 |
| MORGAN STANLEY | History | Added to | 49,876 | 2,051 | 0.0% | 0.0% | 40 | +27,039 | 118.4% | Q4 2025 | Feb 13, 2026 |
| BARCLAYS PLC | History | Added to | 48,172 | 1,981 | 0.0% | 0.0% | 41 | +30,529 | 173.04% | Q4 2025 | Feb 13, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 43,567 | 1,792 | 0.0% | 0.0% | 42 | +37,026 | 566.06% | Q4 2025 | Feb 17, 2026 |
| SILVERARC CAPITAL MANAGEMENT, LLC | History | Reduced | 41,460 | 1,705 | 0.24% | 0.43% | 43 | -67,341 | -61.89% | Q4 2025 | Feb 12, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | History | Reduced | 38,347 | 1,577 | 0.0% | 0.0% | 44 | -3,887 | -9.2% | Q4 2025 | Feb 17, 2026 |
| ALPS ADVISORS INC | History | New | 36,648 | 1,507 | 0.01% | — | 45 | +36,648 | New | Q4 2025 | Feb 12, 2026 |
| GOLDMAN SACHS GROUP INC | History | Added to | 36,269 | 1,492 | 0.0% | 0.0% | 46 | +24,091 | 197.82% | Q4 2025 | Mar 25, 2026 |
| Bank of New York Mellon Corp | History | Added to | 35,134 | 1,445 | 0.0% | 0.0% | 47 | +7,671 | 27.93% | Q4 2025 | Feb 10, 2026 |
| POLEN CAPITAL MANAGEMENT LLC | History | No change | 31,258 | 1,285 | 0.01% | 0.0% | 48 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| Rafferty Asset Management, LLC | History | New | 24,690 | 1,015 | 0.0% | — | 49 | +24,690 | New | Q4 2025 | Feb 13, 2026 |
| Nuveen, LLC | History | Added to | 23,734 | 976 | 0.0% | 0.0% | 50 | +7,694 | 47.97% | Q4 2025 | Feb 12, 2026 |
| Russell Investments Group, Ltd. | History | Added to | 21,941 | 902 | 0.0% | 0.0% | 51 | +20,919 | 2046.87% | Q4 2025 | Feb 17, 2026 |
| RHUMBLINE ADVISERS | History | Added to | 17,694 | 727 | 0.0% | 0.0% | 52 | +454 | 2.63% | Q4 2025 | Feb 13, 2026 |
| WELLS FARGO & COMPANY/MN | History | Added to | 17,551 | 722 | 0.0% | 0.0% | 53 | +9,975 | 131.67% | Q4 2025 | Feb 13, 2026 |
| Squarepoint Ops LLC | History | Added to | 16,360 | 673 | 0.0% | 0.0% | 54 | +6,198 | 60.99% | Q4 2025 | Feb 13, 2026 |
| ALLIANCEBERNSTEIN L.P. | History | New | 15,620 | 642 | 0.0% | — | 55 | +15,620 | New | Q4 2025 | Feb 17, 2026 |
| SG Americas Securities, LLC | History | New | 10,691 | 440 | 0.0% | — | 56 | +10,691 | New | Q4 2025 | Jan 09, 2026 |
| China Universal Asset Management Co., Ltd. | History | Added to | 10,272 | 422 | 0.03% | 0.01% | 57 | +5,272 | 105.44% | Q4 2025 | Jan 29, 2026 |
| DEUTSCHE BANK AG\ | History | Added to | 10,029 | 412 | 0.0% | 0.0% | 58 | +433 | 4.51% | Q4 2025 | Feb 11, 2026 |
| PROFUND ADVISORS LLC | History | New | 9,213 | 379 | 0.01% | — | 59 | +9,213 | New | Q4 2025 | Feb 06, 2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | History | Added to | 8,915 | 367 | 0.0% | 0.0% | 60 | +3,272 | 57.98% | Q4 2025 | Feb 17, 2026 |
| MetLife Investment Management, LLC | History | Added to | 8,565 | 352 | 0.0% | 0.0% | 61 | +532 | 6.62% | Q4 2025 | Feb 12, 2026 |
| INTECH INVESTMENT MANAGEMENT LLC | History | Added to | 7,589 | 312 | 0.0% | 0.0% | 62 | +103 | 1.38% | Q4 2025 | Feb 10, 2026 |
| KENNEDY CAPITAL MANAGEMENT LLC | History | New | 6,752 | 277 | 0.01% | — | 63 | +6,752 | New | Q4 2025 | Feb 13, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | New | 6,400 | 263 | 0.0% | — | 64 | +6,400 | New | Q4 2025 | Feb 17, 2026 |
| Virtus Investment Advisers, LLC | History | Reduced | 6,220 | 255 | 0.07% | 0.06% | 65 | -478 | -7.14% | Q4 2025 | Feb 17, 2026 |
| AMERICAN CENTURY COMPANIES INC | History | New | 6,180 | 254 | 0.0% | — | 66 | +6,180 | New | Q4 2025 | Feb 13, 2026 |
| DARK FOREST CAPITAL MANAGEMENT LP | History | New | 5,991 | 246 | 0.01% | — | 67 | +5,991 | New | Q4 2025 | Feb 17, 2026 |
| D. E. Shaw & Co., Inc. | History | New | 5,742 | 236 | 0.0% | — | 68 | +5,742 | New | Q4 2025 | Feb 17, 2026 |
| NEW YORK STATE COMMON RETIREMENT FUND | History | No change | 5,300 | 218 | 0.0% | 0.0% | 69 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| CITIGROUP INC | History | Added to | 5,185 | 213 | 0.0% | 0.0% | 70 | +4,498 | 654.73% | Q4 2025 | Feb 13, 2026 |
| XTX Topco Ltd | History | New | 4,926 | 202 | 0.01% | — | 71 | +4,926 | New | Q4 2025 | Feb 17, 2026 |
| ProShare Advisors LLC | History | New | 4,903 | 201 | 0.0% | — | 72 | +4,903 | New | Q4 2025 | Feb 06, 2026 |
| LOS ANGELES CAPITAL MANAGEMENT LLC | History | New | 5,189 | 197 | 0.0% | — | 73 | +5,189 | New | Q4 2025 | Feb 11, 2026 |
| CIBC Private Wealth Group LLC | History | New | 4,500 | 185 | 0.0% | — | 74 | +4,500 | New | Q4 2025 | Feb 12, 2026 |
| Police & Firemen's Retirement System of New Jersey | History | Added to | 4,232 | 174 | 0.0% | 0.0% | 75 | +998 | 30.86% | Q4 2025 | Feb 13, 2026 |
| AlphaCentric Advisors LLC | History | New | 2,720 | 111 | 0.11% | — | 76 | +2,720 | New | Q4 2025 | Feb 12, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 2,264 | 93 | 0.0% | 0.0% | 77 | -116 | -4.87% | Q4 2025 | Feb 10, 2026 |
| Mirae Asset Global Investments Co., Ltd. | History | New | 2,169 | 89 | 0.0% | — | 78 | +2,169 | New | Q4 2025 | Jan 26, 2026 |
| Legal & General Group Plc | History | Reduced | 1,682 | 69 | 0.0% | 0.0% | 79 | -5,692 | -77.19% | Q4 2025 | Feb 09, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | New | 1,406 | 57 | 0.0% | — | 80 | +1,406 | New | Q4 2025 | Feb 17, 2026 |
| Ameritas Investment Partners, Inc. | History | Added to | 1,302 | 53 | 0.0% | 0.0% | 81 | +43 | 3.42% | Q4 2025 | Feb 11, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 1,129 | 46 | 0.0% | 0.0% | 82 | -3,361 | -74.86% | Q4 2025 | Feb 17, 2026 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | History | Added to | 988 | 40 | 0.0% | 0.0% | 83 | +217 | 28.15% | Q4 2025 | Feb 17, 2026 |
| GF FUND MANAGEMENT CO. LTD. | History | New | 876 | 36 | 0.0% | — | 84 | +876 | New | Q4 2025 | Jan 27, 2026 |
| ROYAL BANK OF CANADA | History | New | 489 | 21 | 0.0% | — | 86 | +489 | New | Q4 2025 | Feb 17, 2026 |
| AMALGAMATED BANK | History | Added to | 504 | 21 | 0.0% | 0.0% | 85 | +83 | 19.71% | Q4 2025 | Feb 05, 2026 |
| FMR LLC | History | Added to | 384 | 15 | 0.0% | 0.0% | 87 | +150 | 64.1% | Q4 2025 | Feb 17, 2026 |
| Farther Finance Advisors, LLC | History | New | 190 | 7 | 0.0% | — | 88 | +190 | New | Q4 2025 | Jan 23, 2026 |
| GAMMA Investing LLC | History | Added to | 177 | 7 | 0.0% | 0.0% | 89 | +24 | 15.69% | Q4 2025 | Jan 05, 2026 |
| Daiwa Securities Group Inc. | History | New | 149 | 6 | 0.0% | — | 90 | +149 | New | Q4 2025 | Feb 11, 2026 |
| Sterling Capital Management LLC | History | Added to | 105 | 4 | 0.0% | — | 91 | +75 | 250.0% | Q4 2025 | Feb 13, 2026 |
| CWM, LLC | History | Added to | 80 | 3 | 0.0% | 0.0% | 92 | +20 | 33.33% | Q4 2025 | Jan 26, 2026 |
| US BANCORP \DE\ | History | Reduced | 65 | 2 | 0.0% | 0.0% | 93 | -46 | -41.44% | Q4 2025 | Jan 30, 2026 |
| Aster Capital Management (DIFC) Ltd | History | Reduced | 37 | 1 | 0.0% | 0.01% | 96 | -372 | -90.95% | Q4 2025 | Feb 17, 2026 |
| Rockefeller Capital Management L.P. | History | New | 48 | 1 | 0.0% | — | 95 | +48 | New | Q4 2025 | Mar 16, 2026 |
| Allworth Financial LP | History | New | 28 | 1 | 0.0% | — | 94 | +28 | New | Q4 2025 | Feb 05, 2026 |
| Hughes Financial Services, LLC | History | Reduced | 25 | 1 | 0.0% | 0.0% | 97 | -19 | -43.18% | Q4 2025 | Feb 11, 2026 |
| BRAIDWELL LP | History | Closed out | 0 | 0 | — | 0.27% | — | -314,013 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Holocene Advisors, LP | History | Closed out | 0 | 0 | — | 0.0% | — | -50,000 | -100.0% | Q3 2025 | Nov 14, 2025 |
| MARSHALL WACE, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -30,103 | -100.0% | Q3 2025 | Nov 13, 2025 |
| RENAISSANCE TECHNOLOGIES LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -14,600 | -100.0% | Q3 2025 | Nov 13, 2025 |
| Jain Global LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -8,513 | -100.0% | Q3 2025 | Nov 14, 2025 |
| FEDERATED HERMES, INC. | History | Closed out | 0 | 0 | — | 0.0% | — | -113 | -100.0% | Q3 2025 | Nov 03, 2025 |
| Arax Advisory Partners | History | Closed out | 0 | 0 | — | 0.0% | — | -92 | -100.0% | Q3 2025 | Nov 14, 2025 |
| ROTHSCHILD INVESTMENT LLC | History | New | 1 | 0 | — | — | — | +1 | New | Q4 2025 | Feb 10, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | No change | 5 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |
| EverSource Wealth Advisors, LLC | History | No change | 20 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |