Form 4 Filing for Laurie Stelzer

Laurie Stelzer, a director at Sionna Therapeutics, Inc., acquired 17,340 non-qualified stock options on June 17, 2026. These options, with an exercise price of $36.73, are 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. The filing also notes that Ms. Stelzer acquired these options directly. This transaction is reported on Form 4.