Who Owns SIONNA THERAPEUTICS INC (SION)? -- Institutional Holders (2026-06-30)
154 institutions reported holding $2.12B of SIONNA THERAPEUTICS INC (SION) in SEC 13F filings for 2026-06-30. Largest institutional holders: RA CAPITAL MANAGEMENT, L.P. ($435.7M), TPG GP A, LLC ($285.7M), VIKING GLOBAL INVESTORS LP ($140.6M), Atlas Venture Life Science Advisors, LLC ($131.8M), ORBIMED ADVISORS LLC ($112.4M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | $435.7M | 9.9M | Hold |
| 2 | TPG GP A, LLC | $285.7M | 6.5M | Hold |
| 3 | VIKING GLOBAL INVESTORS LP | $140.6M | 3.2M | Hold |
| 4 | Atlas Venture Life Science Advisors, LLC | $131.8M | 3.0M | Hold |
| 5 | ORBIMED ADVISORS LLC | $112.4M | 2.6M | Trimmed |
| 6 | ENAVATE SCIENCES GP, LLC | $109.0M | 2.5M | Hold |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $70.4M | 1.6M | Added |
| 8 | VANGUARD GROUP INC | $65.9M | 1.5M | Added |
| 9 | BlackRock, Inc. | $64.9M | 1.5M | Added |
| 10 | JPMORGAN CHASE & CO | $64.1M | 1.5M | Added |
| 11 | JENNISON ASSOCIATES LLC | $51.6M | 1.2M | Trimmed |
| 12 | CITADEL ADVISORS LLC | $50.9M | 1.2M | Trimmed |
| 13 | STATE STREET CORP | $44.9M | 1.0M | Added |
| 14 | PERCEPTIVE ADVISORS LLC | $39.8M | 905,000 | Added |
| 15 | DEERFIELD MANAGEMENT COMPANY, L.P. | $30.0M | 680,916 | Trimmed |
| 16 | Siren, L.L.C. | $26.9M | 610,515 | Added |
| 17 | PRICE T ROWE ASSOCIATES INC /MD/ | $21.0M | 478,016 | Trimmed |
| 18 | EVENTIDE ASSET MANAGEMENT, LLC | $20.9M | 474,981 | Trimmed |
| 19 | GEODE CAPITAL MANAGEMENT, LLC | $20.1M | 457,145 | Added |
| 20 | Casdin Capital, LLC | $17.6M | 400,000 | New |
| 21 | BAKER BROS. ADVISORS LP | $17.6M | 400,000 | Hold |
| 22 | GOLDMAN SACHS GROUP INC | $17.1M | 388,810 | Added |
| 23 | Driehaus Capital Management LLC | $17.0M | 385,447 | Added |
| 24 | MILLENNIUM MANAGEMENT LLC | $14.3M | 325,333 | Added |
| 25 | FRANKLIN RESOURCES INC | $12.8M | 290,113 | Added |
Source: SEC Form 13F filings · as of 2026-06-30