RA Capital Nexus Fund, L.P. Plans to Sell Shares in Sionna Therapeutics, Inc.

RA Capital Nexus Fund, L.P., a significant shareholder and director of Sionna Therapeutics, Inc., has filed a Form 144 notice indicating its intention to sell 31,392 common shares of Sionna Therapeutics. These shares were acquired on September 18, 2020, through a private transaction. The approximate sale date is set for October 28, 2025, with an aggregate market value of $1,238,414.40. Additionally, RA Capital Nexus Fund, L.P. recently sold 122,271 common shares on October 24, 2025, generating gross proceeds of $4,794,245.91. The shares are traded on the NASDAQ GM, and the broker involved in the transaction is BTIG, LLC. This filing highlights significant trading activity by a major shareholder, which could impact the stock's market performance.