AlphaYouRC
Schedule 13D filing
RA CAPITAL MANAGEMENT, L.P. disclosed a 14.3% stake in Sionna Therapeutics, Inc. (SION)
RA CAPITAL MANAGEMENT, L.P. reported owning 14.3% of Sionna Therapeutics, Inc. (SION) (6,476,193 shares) in a Schedule 13D filed Sep 21, 2026.
A 13D means the holder may push for changes at the company.
- Disclosed
- Sep 21, 2026
- Source
- Schedule 13D
More SION insider and Congress trades
From a public Schedule 13D, linked above. Not investment advice, and not a recommendation to buy or sell.