Sionna Therapeutics, Inc. (SION) ownership: Top institutional holder: RA CAPITAL MANAGEMENT, L.P. ($397.09M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 9905045.00 | $397.09M | 2026-03-31 |
| TPG GP A, LLC | 6494962.00 | $260.38M | 2026-03-31 |
| ORBIMED ADVISORS LLC | 3530702.00 | $141.55M | 2026-03-31 |
| VIKING GLOBAL INVESTORS LP | 3195181.00 | $128.09M | 2026-03-31 |
| Atlas Venture Life Science Advisors, LLC | 2995602.00 | $120.09M | 2026-03-31 |
| ENAVATE SCIENCES GP, LLC | 2478030.00 | $99.34M | 2026-03-31 |
| JENNISON ASSOCIATES LLC | 1451220.00 | $58.18M | 2026-03-31 |
| JPMORGAN CHASE & CO | 1465014.00 | $53.71M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.