Form 4 Filing for Sionna Therapeutics, Inc. - Officer/Director Transaction

This filing details a Form 4 submitted by Joanne L. Viney, a director at Sionna Therapeutics, Inc. (SION). On June 17, 2026, Ms. Viney was granted 17,340 non-qualified stock options with a right to buy at a price of $0.00. These options are exercisable for the company's Common Stock. The options vest in full on the earlier of June 17, 2027, or the next annual meeting, contingent upon continued service. The options expire on June 16, 2036. Ms. Viney holds these options directly, and following this transaction, she owns 17,340 shares. The filing was signed by Jennifer Fitzpatrick as attorney-in-fact for Ms. Viney on June 18, 2026.