Sionna TherapeuticsSION
13F holders, Q2 2025 (June 30)65holders +18
26new positions
8sold out
4famous investors
$17.35avg. 13F price*
At the end of Q2 2025, 65 institutions reported holding Sionna Therapeutics Inc. (SION) in their 13F filings, up 18 from Q1 2025. 26 opened new positions and 8 sold out. The largest holders were Ra Capital Management, L.P. ($181.2M), TPG GP A, LLC ($117.0M) and Orbimed Advisors LLC ($64.3M). 4 famous investors held it, including Andreas Halvorsen (0.2% of Viking Global Investors's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Sionna Therapeutics Inc.
- CUSIP
- 829401108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 26 | $22.7M |
| Exits | 8 | $5.3M |
All 13F filers, Q1 2025 → Q2 2025: 3,364,116 shares bought and 1,407,668 shares sold, net +1,956,448 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 65 holders
| Ra Capital Management, L.P. | 3.05% | No change | 10,445,322 | $181.2M |
| TPG GP A, LLC | 6.24% | Add +0.9% | 6,744,962 | $117.0M |
| Orbimed Advisors LLC | 1.62% | No change | 3,704,959 | $64.3M |
| Atlas Venture Life Science Advisors, LLC | 9.68% | No change | 3,694,020 | $64.1M |
| Viking Global Investors | 0.16% | Add +8.2% | 3,195,181 | $55.4M |
| Enavate Sciences Gp, LLC | 24.35% | No change | 2,478,030 | $43.0M |
| JPMorgan Chase & Co. | 0.00% | Add +2.4% | 2,221,188 | $38.5M |
| Perceptive Advisors LLC | 0.79% | Reduce -2.8% | 1,216,045 | $21.1M |
| Braidwell LP | 0.90% | New | 1,081,855 | $18.8M |
| Deerfield Management Company, L.P. | 0.34% | Add +29.9% | 970,590 | $16.8M |
| Aberdeen Group plc | 0.03% | Add +27.4% | 950,547 | $16.5M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -13.6% | 861,238 | $14.9M |
| Jennison Associates LLC | 0.01% | Reduce -12.5% | 752,800 | $13.1M |
| BlackRock, Inc. | 0.00% | Add +221.1% | 637,104 | $11.1M |
| Vanguard Group Inc. | 0.00% | Add +15.4% | 630,351 | $10.9M |
| Franklin Resources Inc. | 0.00% | No change | 500,023 | $8.7M |
| Baker Bros. Advisors LP | 0.07% | No change | 400,000 | $6.9M |
| Soleus Capital Management, L.P. | 0.45% | Add +56.7% | 376,000 | $6.5M |
| Siren, L.L.C. | 0.29% | No change | 325,000 | $5.6M |
| Geode Capital Management, LLC | 0.00% | Add +113.4% | 289,275 | $5.0M |
| Ameriprise Financial Inc. | 0.00% | Add +13.2% | 236,813 | $4.1M |
| Alyeska Investment Group, L.P. | 0.01% | No change | 186,222 | $3.2M |
| Silverarc Capital Management, LLC | 0.66% | Add +63.0% | 186,015 | $3.2M |
| Prudential Financial Inc. | 0.00% | Add +114.6% | 135,185 | $2.3M |
| Citadel Advisors | 0.00% | Reduce -60.2% | 129,912 | $2.3M |
| State Street Corp. | 0.00% | Add +764.7% | 124,518 | $2.2M |
| Rock Springs Capital Management LP | 0.11% | No change | 99,429 | $1.7M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +43.6% | 92,832 | $1.6M |
| Northern Trust Corp. | 0.00% | Add +242.6% | 91,890 | $1.6M |
| Driehaus Capital Management LLC | 0.01% | Reduce -74.5% | 83,850 | $1.5M |
| Woodline Partners LP | 0.01% | No change | 80,000 | $1.4M |
| UBS Group AG | 0.00% | Add +360.9% | 51,367 | $891K |
| Holocene Advisors, LP | 0.00% | No change | 50,000 | $868K |
| TD Asset Management Inc | 0.00% | Reduce -9.8% | 49,966 | $867K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -27.8% | 46,048 | $799K |
| Morgan Stanley | 0.00% | Add +1017.5% | 44,018 | $764K |
| Manufacturers Life Insurance Company, The | 0.00% | Add +13.4% | 38,038 | $660K |
| Renaissance Technologies | 0.00% | New | 26,000 | $451K |
| Bank of New York Mellon Corp | 0.00% | New | 24,131 | $419K |
| Barclays PLC | 0.00% | New | 23,022 | $399K |
| Rhumbline Advisers | 0.00% | New | 17,670 | $307K |
| Bantamac Capital, LLC | 0.11% | New | 16,975 | $295K |
| Polen Capital Management LLC | 0.00% | New | 16,975 | $295K |
| Nuveen, LLC | 0.00% | New | 16,040 | $278K |
| Susquehanna International Group, LLP | 0.00% | New | 14,834 | $257K |
| Millennium Management | 0.00% | Reduce -92.2% | 14,034 | $243K |
| Commonwealth Equity Services, LLC | 0.00% | New | 14,017 | $243K |
| Deutsche Bank AG | 0.00% | New | 9,596 | $166K |
| MetLife Investment Management, LLC | 0.00% | New | 8,033 | $139K |
| New York State Common Retirement Fund | 0.00% | New | 6,800 | $118K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | New | 6,747 | $117K |
| Wells Fargo & Company | 0.00% | New | 6,374 | $111K |
| Bank of America Corp. | 0.00% | Reduce -31.2% | 6,012 | $104K |
| Virtus Investment Advisers, LLC | 0.03% | New | 5,535 | $96K |
| Citigroup Inc. | 0.00% | New | 4,380 | $76K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | New | 2,608 | $45K |
| STRS Ohio | 0.00% | New | 2,300 | $40K |
| BNP Paribas Financial Markets | 0.00% | New | 1,761 | $31K |
| Legal & General Group Plc | 0.00% | New | 1,374 | $24K |
| Ameritas Investment Partners, Inc. | 0.00% | New | 1,259 | $22K |
| California State Teachers Retirement System | 0.00% | New | 770 | $13K |
| Amalgamated Bank | 0.00% | New | 421 | $7K |
| Royal Bank of Canada | 0.00% | Reduce -90.3% | 60 | $1K |
| Hughes Financial Services, LLC | 0.00% | New | 44 | $747 |
| Sterling Capital Management LLC | 0.00% | New | 30 | $521 |
"% of holder's portfolio" is SION's weight in each manager's 13F, not the share of Sionna Therapeutics Inc. the manager owns.