SION Sionna Therapeutics, Inc.
Sionna Therapeutics, Inc. (SION) Institutional Ownership
What the institutions did with SION last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 9.9M | 20.5% |
| TPG GP A, LLC | 6.5M | 13.5% |
| VIKING GLOBAL INVESTORS LP | 3.2M | 6.6% |
| Atlas Venture Life Science Advisors, LLC | 3.0M | 6.2% |
| ORBIMED ADVISORS LLC | 2.6M | 5.3% |
| ENAVATE SCIENCES GP, LLC | 2.5M | 5.1% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.6M | 3.3% |
| JPMORGAN CHASE & CO | 1.5M | 3.1% |
| BlackRock, Inc. | 1.5M | 3.1% |
| JENNISON ASSOCIATES LLC | 1.2M | 2.4% |
| CITADEL ADVISORS LLC | 1.1M | 2.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | 2.3% |
| STATE STREET CORP | 1.0M | 2.1% |
| PERCEPTIVE ADVISORS LLC | 905.0K | 1.9% |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 680.9K | 1.4% |
| Siren, L.L.C. | 610.5K | 1.3% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 478.0K | 1.0% |
| EVENTIDE ASSET MANAGEMENT, LLC | 475.0K | 1.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 457.1K | 0.9% |
| BAKER BROS. ADVISORS LP | 400.0K | 0.8% |
| Casdin Capital, LLC | 400.0K | 0.8% |
| Kalehua Capital Management LLC | 394.1K | 0.8% |
| GOLDMAN SACHS GROUP INC | 388.8K | 0.8% |
| Driehaus Capital Management LLC | 385.4K | 0.8% |
| FRANKLIN RESOURCES INC | 290.1K | 0.6% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | 150.0K | 1.6M | +1.5M |
| ORBIMED ADVISORS LLC | Reduced | 3.5M | 2.6M | -974.8K |
| Casdin Capital, LLC | New | 0 | 400.0K | +400.0K |
| Siren, L.L.C. | Increased | 300.0K | 610.5K | +310.5K |
| Driehaus Capital Management LLC | Increased | 76.6K | 385.4K | +308.8K |
| DEERFIELD MANAGEMENT COMPANY, L.P. | Reduced | 970.6K | 680.9K | -289.7K |
| Aberdeen Group plc | Reduced | 564.2K | 284.1K | -280.0K |
| JENNISON ASSOCIATES LLC | Reduced | 1.5M | 1.2M | -279.1K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 756.4K | 478.0K | -278.4K |
| STATE STREET CORP | Increased | 756.2K | 1.0M | +265.3K |
| PERCEPTIVE ADVISORS LLC | Increased | 658.4K | 905.0K | +246.6K |
| FMR LLC | Increased | 81.4K | 278.3K | +196.9K |
| Artisan Partners Limited Partnership | New | 0 | 189.5K | +189.5K |
| Longaeva Partners L.P. | Increased | 12.7K | 196.4K | +183.7K |
| BlackRock, Inc. | Increased | 1.3M | 1.5M | +178.9K |
| EVENTIDE ASSET MANAGEMENT, LLC | Reduced | 645.5K | 475.0K | -170.5K |
| Sio Capital Management, LLC | Reduced | 294.3K | 127.8K | -166.5K |
| Sofinnova Investments, Inc. | New | 0 | 144.4K | +144.4K |
| MILLENNIUM MANAGEMENT LLC | Increased | 140.6K | 276.7K | +136.1K |
| GOLDMAN SACHS GROUP INC | Increased | 263.2K | 388.8K | +125.6K |
| Soleus Capital Management, L.P. | Reduced | 293.5K | 177.7K | -115.8K |
| FRANKLIN RESOURCES INC | Increased | 175.5K | 290.1K | +114.6K |
| First Turn Management, LLC | New | 0 | 110.5K | +110.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.0M | 1.1M | +102.5K |
| D. E. Shaw & Co., Inc. | New | 0 | 101.6K | +101.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.