Sionna TherapeuticsSION
13F holders, Q1 2026 (March 31)122holders +21
28new positions
9sold out
4famous investors
$39.98avg. 13F price*
At the end of Q1 2026, 122 institutions reported holding Sionna Therapeutics Inc. (SION) in their 13F filings, up 21 from Q4 2025. 28 opened new positions and 9 sold out. The largest holders were Ra Capital Management, L.P. ($397.1M), TPG GP A, LLC ($260.4M) and Orbimed Advisors LLC ($141.5M). 4 famous investors held it, including Andreas Halvorsen (0.4% of Viking Global Investors's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Sionna Therapeutics Inc.
- CUSIP
- 829401108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 28 | $52.0M |
| Exits | 9 | $1.5M |
All 13F filers, Q4 2025 → Q1 2026: 2,871,865 shares bought and 1,520,941 shares sold, net +1,350,924 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 122 holders
| Ra Capital Management, L.P. | 4.21% | No change | 9,905,045 | $397.1M |
| TPG GP A, LLC | 7.62% | Reduce -3.7% | 6,494,962 | $260.4M |
| Orbimed Advisors LLC | 3.20% | Reduce -0.9% | 3,530,702 | $141.5M |
| Viking Global Investors | 0.36% | No change | 3,195,181 | $128.1M |
| Atlas Venture Life Science Advisors, LLC | 15.20% | No change | 2,995,602 | $120.1M |
| Enavate Sciences Gp, LLC | 28.26% | No change | 2,478,030 | $99.3M |
| Jennison Associates LLC | 0.04% | Add +30.1% | 1,451,220 | $58.2M |
| JPMorgan Chase & Co. | 0.00% | Add +18.9% | 1,465,014 | $53.7M |
| BlackRock, Inc. | 0.00% | Add +0.3% | 1,295,867 | $52.0M |
| Citadel Advisors | 0.03% | Add +7.3% | 1,166,931 | $46.8M |
| Vanguard Capital Management LLC | 0.00% | — | 1,029,497 | $41.3M |
| Deerfield Management Company, L.P. | 0.54% | No change | 970,590 | $38.9M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -9.0% | 756,376 | $30.3M |
| State Street Corp. | 0.00% | Add +9.1% | 756,227 | $30.3M |
| Perceptive Advisors LLC | 0.52% | Reduce -44.2% | 658,439 | $26.4M |
| Eventide Asset Management, LLC | 0.43% | Add +1.0% | 645,530 | $25.9M |
| Aberdeen Group plc | 0.04% | Reduce -32.8% | 564,175 | $22.6M |
| Baker Bros. Advisors LP | 0.09% | No change | 400,000 | $16.0M |
| Geode Capital Management, LLC | 0.00% | Add +2.6% | 389,872 | $15.6M |
| Siren, L.L.C. | 0.33% | No change | 300,000 | $12.0M |
| Sio Capital Management, LLC | 1.70% | New | 294,340 | $11.8M |
| Soleus Capital Management, L.P. | 0.48% | Add +9.3% | 293,500 | $11.8M |
| Goldman Sachs Group Inc. | 0.00% | Add +625.6% | 263,174 | $10.6M |
| Ensign Peak Advisors, Inc | 0.02% | Add +220.1% | 255,636 | $10.2M |
| Candriam S.C.A. | 0.05% | New | 236,813 | $9.5M |
| Kalehua Capital Management LLC | 5.59% | No change | 197,072 | $7.9M |
| Franklin Resources Inc. | 0.00% | No change | 175,483 | $7.0M |
| Adage Capital Partners Gp, L.L.C. | 0.01% | New | 150,000 | $6.0M |
| UBS Group AG | 0.00% | Add +65.6% | 147,641 | $5.9M |
| Vanguard Portfolio Management LLC | 0.00% | — | 142,081 | $5.7M |
| Superstring Capital Management LP | 4.04% | Reduce -21.9% | 141,024 | $5.7M |
| Millennium Management | 0.00% | Add +74.6% | 140,641 | $5.6M |
| Point72 Asset Management | 0.01% | New | 136,549 | $5.5M |
| Alyeska Investment Group, L.P. | 0.02% | No change | 136,222 | $5.5M |
| GordonMD Global Investments LP | 3.80% | New | 136,000 | $5.5M |
| Morgan Stanley | 0.00% | Add +166.7% | 133,023 | $5.3M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -2.8% | 120,253 | $4.8M |
| Artia Global Partners LP | 1.08% | No change | 119,741 | $4.8M |
| Northern Trust Corp. | 0.00% | Add +4.2% | 116,776 | $4.7M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 112,175 | $4.5M |
| Rock Springs Capital Management LP | 0.23% | No change | 99,429 | $4.0M |
| Rhenman & Partners Asset Management AB | 0.43% | New | 87,500 | $3.5M |
| TD Asset Management Inc | 0.00% | Reduce -26.8% | 82,996 | $3.3M |
| Ameriprise Financial Inc. | 0.00% | Reduce -19.4% | 81,974 | $3.3M |
| FMR LLC | 0.00% | Add +21096.6% | 81,395 | $3.3M |
| Driehaus Capital Management LLC | 0.02% | Reduce -8.6% | 76,633 | $3.1M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -7.2% | 64,458 | $2.6M |
| Bank of America Corp. | 0.00% | Add +16.8% | 50,870 | $2.0M |
| Seven Grand Managers, LLC | 0.13% | No change | 50,000 | $2.0M |
| Integral Health Asset Management, LLC | 0.11% | New | 50,000 | $2.0M |
| Ishara Investments LP | 1.99% | New | 49,200 | $2.0M |
| Russell Investments Group, Ltd. | 0.00% | Add +120.7% | 48,419 | $1.9M |
| Wellington Management Group LLP | 0.00% | Add +20.2% | 46,079 | $1.8M |
| Qube Research & Technologies Ltd | 0.00% | New | 42,242 | $1.7M |
| BNP Paribas Financial Markets | 0.00% | Add +1692.0% | 40,570 | $1.6M |
| Silverarc Capital Management, LLC | 0.19% | Reduce -4.9% | 39,417 | $1.6M |
| Alps Advisors Inc. | 0.01% | Reduce -0.1% | 36,628 | $1.5M |
| Stempoint Capital LP | 0.28% | New | 36,540 | $1.5M |
| Bank of New York Mellon Corp | 0.00% | Reduce -3.9% | 33,778 | $1.4M |
| Polen Capital Management LLC | 0.01% | Reduce -14.3% | 26,775 | $1.1M |
| Maven Securities LTD | 0.06% | New | 25,000 | $1.0M |
| Nuveen, LLC | 0.00% | No change | 23,734 | $951K |
| XTX Topco Ltd | 0.02% | Add +378.1% | 23,551 | $944K |
| Rafferty Asset Management, LLC | 0.00% | Reduce -10.3% | 22,137 | $887K |
| Barclays PLC | 0.00% | Reduce -61.8% | 18,385 | $737K |
| Rhumbline Advisers | 0.00% | Add +3.5% | 18,308 | $734K |
| Citigroup Inc. | 0.00% | Add +248.3% | 18,058 | $724K |
| Alliancebernstein L.P. | 0.00% | Add +5.1% | 16,410 | $675K |
| Squarepoint Ops LLC | 0.00% | Reduce -7.0% | 15,217 | $610K |
| Walleye Capital LLC | 0.00% | New | 15,097 | $605K |
| Deutsche Bank AG | 0.00% | Add +32.1% | 13,249 | $531K |
| Longaeva Partners L.P. | 0.02% | Reduce -84.1% | 12,693 | $509K |
| Kennedy Capital Management LLC | 0.01% | Add +81.9% | 12,284 | $492K |
| Vanguard Global Advisers, LLC | 0.00% | — | 11,191 | $449K |
| Invesco Ltd. | 0.00% | Reduce -90.3% | 10,787 | $432K |
| Profund Advisors LLC | 0.01% | Add +7.9% | 9,939 | $398K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +3.0% | 9,185 | $363K |
| MetLife Investment Management, LLC | 0.00% | No change | 8,565 | $343K |
| China Universal Asset Management Co., Ltd. | 0.02% | Reduce -22.9% | 7,920 | $318K |
| Susquehanna International Group, LLP | 0.00% | New | 7,310 | $293K |
| ExodusPoint Capital Management, LP | 0.00% | New | 7,190 | $288K |
| VARCOV Co. | 0.10% | New | 6,571 | $263K |
| Virtus Investment Advisers, LLC | 0.07% | Add +2.5% | 6,374 | $256K |
| Quarry LP | 0.05% | New | 6,304 | $253K |
| Hudson Bay Capital Management LP | 0.00% | New | 6,180 | $248K |
| Wells Fargo & Company | 0.00% | Reduce -66.4% | 5,894 | $236K |
| Two Sigma Investments, LP | 0.00% | Reduce -14.1% | 5,500 | $220K |
| Intech Investment Management LLC | 0.00% | Reduce -27.7% | 5,489 | $220K |
| New York State Common Retirement Fund | 0.00% | No change | 5,300 | $212K |
| AlphaCentric Advisors LLC | 0.19% | Add +77.1% | 4,818 | $193K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 4,232 | $170K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -20.7% | 4,116 | $165K |
| Cygnus Capital Advisors, LLC | 0.10% | Add +58.3% | 3,800 | $152K |
| STRS Ohio | 0.00% | New | 2,900 | $116K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +108.3% | 2,352 | $94K |
| Mirae Asset Global Investments Co., Ltd. | 0.00% | Add +7.3% | 2,328 | $93K |
| Legal & General Group Plc | 0.00% | Reduce -14.9% | 1,432 | $57K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,302 | $52K |
| GF Fund Management Co. LTD. | 0.00% | Add +14.5% | 1,003 | $40K |
| California State Teachers Retirement System | 0.00% | Reduce -12.2% | 868 | $35K |
"% of holder's portfolio" is SION's weight in each manager's 13F, not the share of Sionna Therapeutics Inc. the manager owns.