RA Capital Management and Affiliates Sell Shares in Sionna Therapeutics

RA Capital Management, L.P., along with its affiliates RA Capital Healthcare Fund LP, RA Capital Nexus Fund, L.P., RA Capital Nexus Fund III, L.P., and a separately managed account, have reported the sale of shares in Sionna Therapeutics, Inc. The transactions occurred on October 24 and October 28, 2025, with shares sold at weighted average prices ranging from $39.50 to $39.81. The total number of shares sold across these transactions is significant, with post-transaction ownership still substantial. The reporting entities, including Peter Kolchinsky and Rajeev Shah, disclaim beneficial ownership except to the extent of their pecuniary interest. This filing highlights the ongoing adjustments in the investment positions of RA Capital and its affiliates in Sionna Therapeutics.