Sionna TherapeuticsSION
13F holders, Q2 2026 (June 30)146holders +24
33new positions
9sold out
6famous investors
$43.87avg. 13F price*
At the end of Q2 2026, 146 institutions reported holding Sionna Therapeutics Inc. (SION) in their 13F filings, up 24 from Q1 2026. 33 opened new positions and 9 sold out. The largest holders were Ra Capital Management, L.P. ($435.7M), TPG GP A, LLC ($285.7M) and Viking Global Investors ($140.6M). 6 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 Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Sionna Therapeutics Inc.
- CUSIP
- 829401108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 33 | $52.6M |
| Exits | 9 | $2.3M |
All 13F filers, Q1 2026 → Q2 2026: 5,699,168 shares bought and 3,028,501 shares sold, net +2,670,667 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 146 holders
| Ra Capital Management, L.P. | 3.79% | No change | 9,905,045 | $435.7M |
| TPG GP A, LLC | 6.12% | No change | 6,494,962 | $285.7M |
| Viking Global Investors | 0.40% | No change | 3,195,181 | $140.6M |
| Atlas Venture Life Science Advisors, LLC | 14.95% | No change | 2,995,602 | $131.8M |
| Orbimed Advisors LLC | 2.13% | Reduce -27.6% | 2,555,877 | $112.4M |
| Enavate Sciences Gp, LLC | 31.56% | No change | 2,478,030 | $109.0M |
| Adage Capital Partners Gp, L.L.C. | 0.10% | Add +966.7% | 1,600,000 | $70.4M |
| BlackRock, Inc. | 0.00% | Add +13.8% | 1,474,769 | $64.9M |
| JPMorgan Chase & Co. | 0.00% | Add +1.7% | 1,490,508 | $64.1M |
| Jennison Associates LLC | 0.03% | Reduce -19.2% | 1,172,133 | $51.6M |
| Citadel Advisors | 0.03% | Reduce -1.6% | 1,147,636 | $50.5M |
| Vanguard Capital Management LLC | 0.00% | Add +10.0% | 1,132,001 | $49.8M |
| State Street Corp. | 0.00% | Add +35.1% | 1,021,534 | $44.9M |
| Perceptive Advisors LLC | 0.62% | Add +37.5% | 905,000 | $39.8M |
| Deerfield Management Company, L.P. | 0.37% | Reduce -29.9% | 680,916 | $30.0M |
| Siren, L.L.C. | 0.55% | Add +103.5% | 610,515 | $26.9M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -36.8% | 478,016 | $21.0M |
| Eventide Asset Management, LLC | 0.28% | Reduce -26.4% | 474,981 | $20.9M |
| Geode Capital Management, LLC | 0.00% | Add +17.3% | 457,145 | $20.1M |
| Casdin Capital, LLC | 0.88% | New | 400,000 | $17.6M |
| Baker Bros. Advisors LP | 0.09% | No change | 400,000 | $17.6M |
| Goldman Sachs Group Inc. | 0.00% | Add +47.7% | 388,810 | $17.1M |
| Driehaus Capital Management LLC | 0.10% | Add +403.0% | 385,447 | $17.0M |
| Franklin Resources Inc. | 0.00% | Add +65.3% | 290,113 | $12.8M |
| Aberdeen Group plc | 0.02% | Reduce -49.6% | 284,138 | $12.5M |
| FMR LLC | 0.00% | Add +241.9% | 278,292 | $12.2M |
| Millennium Management | 0.01% | Add +96.8% | 276,733 | $12.2M |
| Candriam S.C.A. | 0.05% | Reduce -1.5% | 233,208 | $10.2M |
| Vanguard Portfolio Management LLC | 0.00% | Add +56.9% | 222,949 | $9.8M |
| Kalehua Capital Management LLC | 4.98% | No change | 197,072 | $8.7M |
| Longaeva Partners L.P. | 0.25% | Add +1446.9% | 196,352 | $8.6M |
| Artisan Partners Limited Partnership | 0.01% | New | 189,498 | $8.3M |
| Ensign Peak Advisors, Inc | 0.01% | Reduce -27.8% | 184,532 | $8.1M |
| Soleus Capital Management, L.P. | 0.27% | Reduce -39.5% | 177,687 | $7.8M |
| Northern Trust Corp. | 0.00% | Add +32.3% | 154,476 | $6.8M |
| Morgan Stanley | 0.00% | Add +13.6% | 151,047 | $6.6M |
| Sofinnova Investments, Inc. | 0.34% | New | 144,432 | $6.4M |
| Qube Research & Technologies Ltd | 0.01% | Add +232.2% | 140,309 | $6.2M |
| Alyeska Investment Group, L.P. | 0.02% | No change | 136,222 | $6.0M |
| GordonMD Global Investments LP | 2.89% | No change | 136,000 | $6.0M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +7.9% | 129,753 | $5.7M |
| Sio Capital Management, LLC | 0.96% | Reduce -56.6% | 127,808 | $5.6M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +8.3% | 121,442 | $5.3M |
| Artia Global Partners LP | 1.00% | No change | 119,741 | $5.3M |
| UBS Group AG | 0.00% | Reduce -21.3% | 116,206 | $5.1M |
| First Turn Management, LLC | 0.52% | New | 110,493 | $4.9M |
| Citigroup Inc. | 0.00% | Add +510.1% | 110,163 | $4.8M |
| D. E. Shaw & Co. | 0.00% | New | 101,644 | $4.5M |
| Rock Springs Capital Management LP | 0.21% | No change | 99,429 | $4.4M |
| Walleye Capital LLC | 0.02% | Add +544.8% | 97,347 | $4.3M |
| Rhenman & Partners Asset Management AB | 0.40% | Add +11.0% | 97,100 | $4.3M |
| Bank of America Corp. | 0.00% | Add +74.8% | 88,908 | $3.9M |
| Ameriprise Financial Inc. | 0.00% | Add +0.3% | 82,232 | $3.6M |
| Integral Health Asset Management, LLC | 0.14% | Add +50.0% | 75,000 | $3.3M |
| Superstring Capital Management LP | 1.75% | Reduce -55.2% | 63,156 | $2.8M |
| Stempoint Capital LP | 0.45% | Add +62.6% | 59,426 | $2.6M |
| Deutsche Bank AG | 0.00% | Add +302.7% | 53,353 | $2.3M |
| Seven Grand Managers, LLC | 0.09% | No change | 50,000 | $2.2M |
| Point72 Asset Management | 0.00% | Reduce -63.9% | 49,328 | $2.2M |
| TD Asset Management Inc | 0.00% | Reduce -42.9% | 47,396 | $2.1M |
| Alps Advisors Inc. | 0.01% | Add +24.3% | 45,525 | $2.0M |
| Silverarc Capital Management, LLC | 0.21% | Add +7.8% | 42,478 | $1.9M |
| Russell Investments Group, Ltd. | 0.00% | Reduce -12.7% | 42,258 | $1.9M |
| Bank of New York Mellon Corp | 0.00% | Add +23.1% | 41,586 | $1.8M |
| Nuveen, LLC | 0.00% | Add +73.8% | 41,259 | $1.8M |
| XTX Topco Ltd | 0.02% | Add +61.8% | 38,096 | $1.7M |
| Wellington Management Group LLP | 0.00% | Reduce -18.9% | 37,365 | $1.6M |
| Mutual of America Capital Management LLC | 0.02% | New | 35,968 | $1.6M |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -45.0% | 35,420 | $1.6M |
| BNP Paribas Financial Markets | 0.00% | Reduce -21.6% | 31,803 | $1.4M |
| Ishara Investments LP | 0.99% | Add +150.0% | 123,000 | $1.4M |
| Swiss National Bank | 0.00% | New | 27,000 | $1.2M |
| Quadrature Capital Ltd | 0.01% | New | 26,023 | $1.1M |
| Trexquant Investment LP | 0.01% | New | 23,810 | $1.0M |
| New York State Common Retirement Fund | 0.00% | Add +345.0% | 23,586 | $1.0M |
| Alliancebernstein L.P. | 0.00% | Add +55.1% | 25,450 | $1.0M |
| Tudor Investment Corporation | 0.00% | New | 22,575 | $993K |
| Rhumbline Advisers | 0.00% | Add +21.9% | 22,309 | $981K |
| Maven Securities LTD | 0.06% | Reduce -20.0% | 20,000 | $880K |
| Los Angeles Capital Management LLC | 0.00% | Add +353.0% | 18,645 | $820K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | New | 18,034 | $793K |
| Rafferty Asset Management, LLC | 0.00% | Reduce -18.7% | 18,004 | $792K |
| Shay Capital LLC | 0.09% | New | 18,000 | $792K |
| Wells Fargo & Company | 0.00% | Add +185.4% | 16,821 | $740K |
| Engineers Gate Manager LP | 0.01% | New | 15,603 | $686K |
| California State Teachers Retirement System | 0.00% | Add +1611.1% | 14,852 | $653K |
| Kennedy Capital Management LLC | 0.01% | Add +2.7% | 12,621 | $555K |
| Marshall Wace, LLP | 0.00% | New | 12,599 | $554K |
| Invesco Ltd. | 0.00% | Add +15.1% | 12,418 | $546K |
| MetLife Investment Management, LLC | 0.00% | Add +28.1% | 10,972 | $483K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +9056.9% | 10,622 | $467K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +15.2% | 10,582 | $463K |
| Jump Financial, LLC | 0.00% | New | 10,473 | $461K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | New | 9,535 | $419K |
| Profund Advisors LLC | 0.01% | Reduce -8.0% | 9,140 | $402K |
| Virtus Investment Advisers, LLC | 0.09% | Add +42.9% | 9,109 | $401K |
| Legal & General Group Plc | 0.00% | Add +531.6% | 9,044 | $398K |
| Vanguard Global Advisers, LLC | 0.00% | Reduce -29.8% | 7,852 | $345K |
| China Universal Asset Management Co., Ltd. | 0.02% | Reduce -9.3% | 7,186 | $316K |
| Quarry LP | 0.05% | Add +7.1% | 6,750 | $297K |
| Barclays PLC | 0.00% | Reduce -64.7% | 6,495 | $286K |
| VARCOV Co. | 0.11% | Reduce -2.3% | 6,418 | $282K |
| Jupiter Topco LLC | 0.00% | — | 6,400 | $281K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +28.5% | 5,438 | $239K |
| Squarepoint Ops LLC | 0.00% | Reduce -64.4% | 5,415 | $238K |
| Intech Investment Management LLC | 0.00% | Reduce -4.9% | 5,218 | $230K |
| State Board of Administration of Florida Retirement System | 0.00% | New | 5,215 | $229K |
| Sei Investments Co. | 0.00% | New | 5,158 | $227K |
| AlphaCentric Advisors LLC | 0.18% | Add +0.9% | 4,863 | $214K |
| Jain Global LLC | 0.00% | New | 4,780 | $210K |
| Axq Capital, LP | 0.02% | New | 4,597 | $202K |
| STRS Ohio | 0.00% | Add +20.7% | 3,500 | $154K |
| Vanguard Investments Australia, Ltd. | 0.00% | New | 3,490 | $154K |
| KLP Kapitalforvaltning As | 0.00% | New | 3,100 | $136K |
| Mirae Asset Global Investments Co., Ltd. | 0.00% | Reduce -13.3% | 2,019 | $89K |
| Quantbot Technologies LP | 0.00% | Add +922.5% | 1,820 | $80K |
| Ameritas Investment Partners, Inc. | 0.00% | Add +28.5% | 1,673 | $74K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -45.6% | 1,279 | $56K |
| Mitsubishi UFJ Asset Management Co., Ltd. | 0.00% | New | 1,000 | $44K |
| GF Fund Management Co. LTD. | 0.00% | Reduce -5.7% | 946 | $42K |
| State of Wyoming | 0.00% | New | 804 | $35K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Add +91.1% | 709 | $31K |
| Royal Bank of Canada | 0.00% | Add +1793.3% | 568 | $25K |
| Nisa Investment Advisors, LLC | 0.00% | New | 385 | $17K |
| Pacer Advisors, Inc. | 0.00% | New | 301 | $13K |
| GAMMA Investing LLC | 0.00% | Add +2.5% | 244 | $11K |
| Federation des caisses Desjardins du Quebec | 0.00% | New | 210 | $9K |
| Farther Finance Advisors, LLC | 0.00% | No change | 196 | $9K |
| Rockefeller Capital Management L.P. | 0.00% | Reduce -52.7% | 114 | $5K |
| Hurley Capital, LLC | 0.00% | New | 113 | $5K |
| US Bancorp \de | 0.00% | Add +103.9% | 104 | $5K |
| Sterling Capital Management LLC | 0.00% | Reduce -38.1% | 65 | $3K |
| Arax Advisory Partners | 0.00% | New | 41 | $2K |
| Bare Financial Services, Inc | 0.00% | New | 37 | $2K |
| Caitong International Asset Management Co., Ltd | 0.00% | Reduce -13.9% | 31 | $1K |
| Hughes Financial Services, LLC | 0.00% | Reduce -3.9% | 25 | $1K |
| Covestor Ltd | 0.00% | Add +300.0% | 12 | $1K |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -13.0% | 20 | $880 |
| Fortitude Family Office, LLC | 0.00% | No change | 15 | $660 |
| SJS Investment Consulting Inc. | 0.00% | New | 9 | $396 |
| Contravisory Investment Management, Inc. | 0.00% | New | 6 | $264 |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -68.8% | 5 | $220 |
| Steward Partners Investment Advisory, LLC | 0.00% | Reduce -98.4% | 4 | $176 |
| National Bank of Canada | 0.00% | New | 2 | $88 |
| Rothschild Investment LLC | 0.00% | No change | 1 | $44 |
| Allworth Financial LP | 0.00% | Reduce -96.5% | 1 | $44 |
"% of holder's portfolio" is SION's weight in each manager's 13F, not the share of Sionna Therapeutics Inc. the manager owns.