SION
Sionna Therapeutics, Inc.
NASDAQ · Healthcare · Biotechnology · US
$5.96
−16.99%0
Insider buys (3m)
5
Insider sells (3m)
-$18.7M
Net value (3m)
-83.2%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 18, 2026 | McKee Charlotte · officer: CMO and Head of R&D | A-Award | 155,700 | $7.18 |
| Sep 18, 2026 | Fitzpatrick Jennifer · officer: CLO and Head of Program Mgmt. | A-Award | 28,133 | $0.00 |
| Sep 18, 2026 | Fitzpatrick Jennifer · officer: CLO and Head of Program Mgmt. | A-Award | 28,132 | $0.00 |
| Sep 18, 2026 | Fitzpatrick Jennifer · officer: CLO and Head of Program Mgmt. | A-Award | 103,140 | $7.18 |
| Sep 18, 2026 | Cloonan Michael · director, officer: President & CEO | A-Award | 109,025 | $0.00 |
| Sep 18, 2026 | Cloonan Michael · director, officer: President & CEO | A-Award | 436,100 | $7.18 |
| Sep 18, 2026 | Ridloff Elena · officer: CFO and CBO | A-Award | 47,269 | $0.00 |
| Sep 18, 2026 | Ridloff Elena · officer: CFO and CBO | A-Award | 47,268 | $0.00 |
| Sep 18, 2026 | Ridloff Elena · officer: CFO and CBO | A-Award | 165,440 | $7.18 |
| Sep 18, 2026 | McKee Charlotte · officer: CMO and Head of R&D | A-Award | 50,000 | $0.00 |
| Jul 9, 2026 | Thompson Peter A. · director | Sale | 85,918 | $45 |
| Jul 9, 2026 | ORBIMED ADVISORS LLC · director | Sale | 85,918 | $45 |
| Jul 7, 2026 | Fitzpatrick Jennifer · officer: Chief Legal Officer | Sale | 10,250 | $44 |
| Jul 7, 2026 | Fitzpatrick Jennifer · officer: Chief Legal Officer | M-Exempt | 10,250 | $6.11 |
| Jul 2, 2026 | Thompson Peter A. · director | Sale | 115,844 | $46 |
| Jul 2, 2026 | ORBIMED ADVISORS LLC · director | Sale | 115,844 | $46 |
| Jun 18, 2026 | RA CAPITAL MANAGEMENT, L.P. · director, 10 percent owner: | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Ruddy Marcella K. · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Resnick Joshua · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Fleming Harold Edward · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Clancy Paul J · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Booth Bruce · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Viney Joanne L. · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Stelzer Laurie · director | A-Award | 17,340 | $37 |
| Jun 18, 2026 | Thompson Peter A. · director | A-Award | 17,340 | $37 |
| May 29, 2026 | Thompson Peter A. · director | Sale | 101 | $44 |
| May 29, 2026 | ORBIMED ADVISORS LLC · director | Sale | 101 | $44 |
| May 11, 2026 | Thompson Peter A. · director | Sale | 59,767 | $45 |
| May 11, 2026 | ORBIMED ADVISORS LLC · director | Sale | 184,639 | $46 |
| May 11, 2026 | ORBIMED ADVISORS LLC · director | Sale | 59,767 | $45 |
Institutional positioning
13F filings over the trailing two quarters
New 70Increased 100Reduced 69Sold out 8
| Filer | Action | Shares | Filed |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | Unchanged | 9,905,045 | May 15, 2026 |
| RA CAPITAL MANAGEMENT, L.P. | Unchanged | 9,905,045 | Aug 14, 2026 |
| TPG GP A, LLC | Unchanged | 6,494,962 | Aug 14, 2026 |
| TPG GP A, LLC | Reduced | 6,494,962 | May 15, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 3,530,702 | May 15, 2026 |
| VIKING GLOBAL INVESTORS LP | Unchanged | 3,195,181 | Aug 14, 2026 |
| VIKING GLOBAL INVESTORS LP | Unchanged | 3,195,181 | May 15, 2026 |
| Atlas Venture Life Science Advisors, LLC | Unchanged | 2,995,602 | Aug 13, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 2,995,602 | May 14, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 2,555,877 | Aug 14, 2026 |
| Enavate Sciences GP, LLC | Unchanged | 2,478,030 | Aug 14, 2026 |
| ENAVATE SCIENCES GP, LLC | Unchanged | 2,478,030 | May 15, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | 1,600,000 | Aug 14, 2026 |
| JPMORGAN CHASE & CO | Increased | 1,490,508 | Aug 12, 2026 |
| BlackRock, Inc. | Increased | 1,474,769 | Aug 7, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 18, 2026