Sionna Therapeutics, Inc.
SION- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0002036042
In the last 90 days, Sionna Therapeutics, Inc. insiders filed 0 open-market purchases and 4 sales; 146 institutions reported holding it in 13F filings for Q2 2026, worth $2.11B in total; Viking Global Investors is the only superinvestor holding it.
13F holders, Q4 2025
Institutional positions in Sionna Therapeutics, Inc. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 101
- +23 vs. Q3 2025
- Shares held
- 44.0M
- +1.11M (+2.6%) vs. Q3 2025
- Total value
- $1.81B
- +$548.2M (+43.5%) vs. Q3 2025
- New holders
- 30
- 39 more added
- Sold out
- 7
- 20 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting SION on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 146 | $2.11B |
| Q1 2026 | 122 | $1.82B |
| Q4 2025 | 101 | $1.81B |
| Q3 2025 | 78 | $1.26B |
| Q2 2025 | 65 | $753.8M |
| Q1 2025 | 47 | $434.1M |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Sionna Therapeutics, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Ra Capital Management, L.P. | 9,905,045 | $407.5M | 4.17% | −540,277−5.2% | Reduced |
| Braidwell LP | 0 | $0 | 0.00% | −314,013−100.0% | Sold out |
| Holocene Advisors, LP | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −30,103−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −14,600−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −8,513−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −113−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −92−100.0% | Sold out |