Who owns Sionna Therapeutics, Inc.?
Institutional ownership of SION from SEC Form 13F filings across 101 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.
101
13F holders
$1.00B
value, 2026 filers
51.6%
of shares outstanding (23.3M sh)
27
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 | TPG GP A, LLC | 6.5M | $285.7M | 5.7% | 14.4% | 0.0% |
| 2 | VIKING GLOBAL INVESTORS LP | 3.2M | $140.6M | 0.4% | 7.1% | 0.0% |
| 3 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.6M | $70.4M | 0.1% | 3.5% | +966.7% |
| 4 | JPMORGAN CHASE & CO | 1.5M | $64.1M | 0.0% | 3.3% | +1.7% |
| 5 | BlackRock, Inc. | 1.5M | $64.9M | 0.0% | 3.3% | +13.8% |
| 6 | JENNISON ASSOCIATES LLC | 1.2M | $51.6M | 0.0% | 2.6% | -19.2% |
| 7 | CITADEL ADVISORS LLC | 1.1M | $50.5M | 0.0% | 2.5% | -1.7% |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | $49.8M | 0.0% | 2.5% | -45.0% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | 478,016 | $21,029 | 0.0% | 1.1% | -36.8% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 457,145 | $20.1M | 0.0% | 1% | +17.3% |
| 11 | GOLDMAN SACHS GROUP INC | 388,810 | $17.1M | 0.0% | 0.9% | +47.7% |
| 12 | FRANKLIN RESOURCES INC | 290,113 | $12.8M | 0.0% | 0.6% | +65.3% |
| 13 | Aberdeen Group plc | 284,138 | $12.5M | 0.0% | 0.6% | -49.6% |
| 14 | FMR LLC | 278,292 | $12.2M | 0.0% | 0.6% | +241.9% |
| 15 | MILLENNIUM MANAGEMENT LLC | 276,733 | $12.2M | 0.0% | 0.6% | +96.8% |
| 16 | Candriam S.C.A. | 233,208 | $10.2M | 0.0% | 0.5% | -1.5% |
| 17 | VANGUARD PORTFOLIO MANAGEMENT LLC | 222,949 | $9.8M | 0.0% | 0.5% | +56.9% |
| 18 | Longaeva Partners L.P. | 196,352 | $8.6M | 0.2% | 0.4% | +1446.9% |
| 19 | Artisan Partners Limited PartnershipNEW | 189,498 | $8.3M | 0.0% | 0.4% | new |
| 20 | NORTHERN TRUST CORP | 154,476 | $6.8M | 0.0% | 0.3% | +32.3% |
| 21 | MORGAN STANLEY | 151,047 | $6.6M | 0.0% | 0.3% | +13.5% |
| 22 | Qube Research & Technologies Ltd | 140,309 | $6.2M | 0.0% | 0.3% | +232.2% |
| 23 | Sixth Street Partners Management Company, L.P.NEW | 129,753 | $5.7M | 1.0% | 0.3% | new |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 129,753 | $5.7M | 0.0% | 0.3% | +7.9% |
| 25 | VANGUARD FIDUCIARY TRUST CO | 121,442 | $5.3M | 0.0% | 0.3% | +8.3% |
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.