Company: SION
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-101830
Chunk: 18

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 18
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 Inc. (NASDAQ: BIIB) (“Biogen”) in various business and commercial roles in his fourteen years at Biogen. His most recent role at Biogen was as senior vice president, U.S. Commercial, where he was the general manager of the multi-billion dollar MS, hemophilia and SMA franchises. Mr. Cloonan has also served on the board of directors of bluebird bio, Inc. (NASDAQ: BLUE) since June 2024. Mr. Cloonan earned a B.A. in economics and accounting from the College of the Holy Cross and an M.B.A. from the Darden Graduate School of Business Administration at the University of Virginia. We believe Mr. Cloonan’s extensive leadership**

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#### experience in the biotechnology industry and experience as a public company board member provides him with the appropriate set of skills to serve as a member of our board of directors.Laurie Stelzer, M.B.A.has served as a member of our board of directors since November 2024. Ms. Stelzer has served as the Chief Financial Officer of Kailera Therapeutics, Inc. (“Kailera”) since January 2025. Prior to Kailera, Ms. Stelzer served as the Chief Financial Officer of Orna Therapeutics (“Orna”) from May 2024 to January 2025. Prior to Orna, Ms. Stelzer served as the Chief Financial Officer of ReNAgade Therapeutics, Inc. (“ReNAgade”) from September 2023 until the completion of its acquisition by Orna in May 2024. Prior to joining ReNAgade, Ms. Stelzer served as the Chief Financial Officer of Mirati Therapeutics, Inc. (Nasdaq: MRTX) (“Mirati Therapeutics”) from May 2022 to September 2023. Prior to joining Mirati Therapeutics, Ms. Stelzer served as the Executive Vice President and Chief Financial Officer of Arena Pharmaceuticals, Inc. (“Arena Pharmaceuticals”) (acquired by Pfizer) from March 2020 until the completion of Pfizer’s acquisition in March 2022. Prior to joining Arena Pharmaceuticals, Ms. Stelzer served as the Chief Financial Officer at Halozyme Therapeutics, Inc. (“Halozyme Therapeutics”) (Nasdaq: HALO) from June 2015 to March 2020, and before Halozyme Therapeutics, she held senior management roles at