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, Q1 2026
Institutional positions in Sionna Therapeutics, Inc. as of Mar 31, 2026. 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
- 122
- +23 vs. Q4 2025
- Shares held
- 45.4M
- +2.65M (+6.2%) vs. Q4 2025
- Total value
- $1.82B
- +$56.2M (+3.2%) vs. Q4 2025
- New holders
- 32
- 40 more added
- Sold out
- 9
- 30 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Sionna Therapeutics, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Soleus Capital Management, L.P. | 293,500 | $11.8M | 0.48% | +25,000+9.3% | Added |
| Sio Capital Management, LLC | 294,340 | $11.8M | 1.70% | +294,340 | New |
| Siren, L.L.C. | 300,000 | $12.0M | 0.33% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 389,872 | $15.6M | 0.00% | +9,830+2.6% | Added |
| Baker Bros. Advisors LP | 400,000 | $16.0M | 0.09% | 00.0% | Unchanged |
| Standard Life Aberdeen plc | 564,175 | $22.6M | 0.04% | −275,785−32.8% | Reduced |
| Eventide Asset Management, LLC | 645,530 | $25.9M | 0.43% | +6,485+1.0% | Added |
| Perceptive Advisors LLC | 658,439 | $26.4M | 0.52% | −520,659−44.2% | Reduced |
| State Street Corp | 756,227 | $30.3M | 0.00% | +62,832+9.1% | Added |
| Price T Rowe Associates Inc | 756,376 | $30.3M | 0.00% | −74,997−9.0% | Reduced |
| Deerfield Management Company, L.P. (Series C) | 970,590 | $38.9M | 0.46% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 1,029,497 | $41.3M | 0.00% | +1,029,497 | New |
| Citadel Advisors LLC | 1,166,931 | $46.8M | 0.03% | +79,606+7.3% | Added |
| BlackRock, Inc. | 1,295,867 | $52.0M | 0.00% | +4,268+0.3% | Added |
| JPMorgan Chase & Co | 1,465,014 | $53.7M | 0.00% | +233,195+18.9% | Added |
| Jennison Associates LLC | 1,451,220 | $58.2M | 0.04% | +335,942+30.1% | Added |
| Enavate Sciences GP, LLC | 2,478,030 | $99.3M | 28.26% | 00.0% | Unchanged |
| Atlas Venture Life Science Advisors, LLC | 2,995,602 | $120.1M | 15.20% | 00.0% | Unchanged |
| Viking Global Investors LPSuperinvestorViking Global Investors | 3,195,181 | $128.1M | 0.36% | 00.0% | Unchanged |
| OrbiMed Advisors LLC | 3,530,702 | $141.5M | 3.22% | −30,953−0.9% | Reduced |
| TPG GP A, LLC | 6,494,962 | $260.4M | 7.08% | −250,000−3.7% | Reduced |
| Ra Capital Management, L.P. | 9,905,045 | $397.1M | 4.21% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −10,691−100.0% | Sold out |
| American Century Companies Inc | 0 | $0 | 0.00% | −6,180−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −5,991−100.0% | Sold out |
| D. E. Shaw & Co., Inc. | 0 | $0 | 0.00% | −5,742−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −4,903−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −1,406−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −504−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −149−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −37−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| CIBC Private Wealth Group, LLC | – | – | – | – | Not filed |