Michael Cloonan's Stock Transactions in Sionna Therapeutics Inc.

Michael Cloonan, a director and officer of Sionna Therapeutics Inc., has filed a Form 144 indicating the sale of 99,800 common shares acquired through the exercise of stock options. The shares were sold on October 21, 2025, with an aggregate market value of $3,213,560. Additionally, Cloonan has engaged in multiple transactions over the past three months, selling a total of 90,200 shares for gross proceeds exceeding $2.7 million. These transactions were executed under a 10b5-1 trading plan, which allows insiders to sell shares at predetermined times to avoid accusations of insider trading. The filing highlights significant insider activity, which may be of interest to investors monitoring insider behavior and its potential impact on the company's stock.