Who owns Sionna Therapeutics, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of SION from SEC Form 13F filings across 146 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 146 institutions disclosed 48.1M shares of Sionna Therapeutics, Inc. worth $2.11B — about 106.5% of shares outstanding; the largest disclosed holder is RA CAPITAL MANAGEMENT, L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
146
13F holders
$2.11B
value, 2026 filers
106.5%
of shares outstanding (48.1M sh)
34
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of SION's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 9.9M | $435.7M | 3.8% | 21.9% | 0.0% |
| 2 | TPG GP A, LLC | 6.5M | $285.7M | 5.7% | 14.4% | 0.0% |
| 3 | VIKING GLOBAL INVESTORS LP | 3.2M | $140.6M | 0.4% | 7.1% | 0.0% |
| 4 | Atlas Venture Life Science Advisors, LLC | 3.0M | $131.8M | 15.0% | 6.6% | 0.0% |
| 5 | ORBIMED ADVISORS LLC | 2.6M | $112.4M | 2.1% | 5.7% | -27.6% |
| 6 | ENAVATE SCIENCES GP, LLC | 2.5M | $109.0M | 31.6% | 5.5% | 0.0% |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.6M | $70.4M | 0.1% | 3.5% | +966.7% |
| 8 | JPMORGAN CHASE & CO | 1.5M | $64.1M | 0.0% | 3.3% | +1.7% |
| 9 | BlackRock, Inc. | 1.5M | $64.9M | 0.0% | 3.3% | +13.8% |
| 10 | JENNISON ASSOCIATES LLC | 1.2M | $51.6M | 0.0% | 2.6% | -19.2% |
| 11 | CITADEL ADVISORS LLC | 1.1M | $50.5M | 0.0% | 2.5% | -1.7% |
| 12 | VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | $49.8M | 0.0% | 2.5% | +10.0% |
| 13 | STATE STREET CORP | 1.0M | $44.9M | 0.0% | 2.3% | +35.1% |
| 14 | PERCEPTIVE ADVISORS LLC | 905,000 | $39.8M | 0.6% | 2% | +37.4% |
| 15 | DEERFIELD MANAGEMENT COMPANY, L.P. | 680,916 | $30.0M | 0.3% | 1.5% | -29.8% |
| 16 | Siren, L.L.C. | 610,515 | $26.9M | 0.5% | 1.4% | +103.5% |
| 17 | PRICE T ROWE ASSOCIATES INC /MD/ | 478,016 | $21.0M | 0.0% | 1.1% | -36.8% |
| 18 | EVENTIDE ASSET MANAGEMENT, LLC | 474,981 | $20.9M | 0.3% | 1.1% | -26.4% |
| 19 | GEODE CAPITAL MANAGEMENT, LLC | 457,145 | $20.1M | 0.0% | 1% | +17.3% |
| 20 | Casdin Capital, LLCNEW | 400,000 | $17.6M | 0.9% | 0.9% | new |
| 21 | BAKER BROS. ADVISORS LP | 400,000 | $17.6M | 0.1% | 0.9% | 0.0% |
| 22 | GOLDMAN SACHS GROUP INC | 388,810 | $17.1M | 0.0% | 0.9% | +47.7% |
| 23 | Driehaus Capital Management LLC | 385,447 | $17.0M | 0.1% | 0.9% | +403.0% |
| 24 | FRANKLIN RESOURCES INC | 290,113 | $12.8M | 0.0% | 0.6% | +65.3% |
| 25 | Aberdeen Group plc | 284,138 | $12.5M | 0.0% | 0.6% | -49.6% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.