RA Capital Management disposes of Sionna Therapeutics shares worth $21.85 million

• RA Capital Management sold 3,448,811 Sionna Therapeutics common shares on Sep. 17, 2026.
• Sales priced at USD 6.32 for 3,415,011 shares; USD 7.46 for 33,800 shares.
• Indirect beneficial ownership stood at 3,448,812 shares following the transactions.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Sionna Therapeutics Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001231919-26-001201), on September 21, 2026, and is solely responsible for the information contained therein.