Sionna Therapeutics, Inc. 4

Peter A. Thompson (OrbiMed) sold 85,918 shares of Sionna Therapeutics, Inc. common stock at $44.86 per share under a 10b5-1 plan.

On 2026-07-07, reporting person Peter A. Thompson, associated with OrbiMed Advisors, effected an open-market sale of 85,918 shares of Sionna Therapeutics, Inc. common stock at an average price of $44.86 per share, for proceeds of approximately $3.86 million. The transaction was executed under a Rule 10b5-1 trading plan and the shares are held of record by OrbiMed Private Investments VIII, LP, with OrbiMed Capital GP VIII LLC and OrbiMed Advisors LLC potentially deemed to share voting and investment power. After the sale, indirect beneficial ownership stood at 2,469,959 shares, with an implied post-transaction value of roughly $110.7 million based on the reported sale price, and all relevant OrbiMed entities and individuals, including Thompson, disclaim beneficial ownership beyond their pecuniary interest.

Filing Facts

CIK

2036042

Ticker

SION

Form

4

Source Type

fda

Accession

0000947871-26-000695

Alert Tier

7