Michael Cloonan

Companies

• Sionna Therapeutics, Inc.Board member Feb 6, 2025 to now¹
• Sionna Therapeutics, Inc.Chief executive officer Feb 6, 2025 to now¹
• Sionna Therapeutics, Inc.President Feb 6, 2025 to now¹
• bluebird bioBoard member Jun 24, 2024 to now²
• Sage Therapeutics, Inc.Chief Business Officer Apr 25, 2017 to Feb 12, 2021³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• STSionna Therapeutics, Inc. SION765,393 shares⁴$3.1M at $4.11Sep 17, 2026
• BBbluebird bio BLUE0 shares⁵Jun 2, 2025

As of each latest filing. The line shows shares held over time.

Recent filings

• Sep 17, 2026Granted 109,025 shares of Sionna Therapeutics, Inc.⁴
• Sep 17, 2026Granted 109,025 shares of Sionna Therapeutics, Inc.⁴
• Oct 21, 2025Sold 33,532 shares at $37.31 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Exercised options 33,532 shares at $6.11 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Sold 22,895 shares at $36.60 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Exercised options 22,895 shares at $6.11 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Sold 30,049 shares at $35.63 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Exercised options 30,049 shares at $6.11 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Sold 13,324 shares at $34.44 of Sionna Therapeutics, Inc.⁶
• Oct 21, 2025Exercised options 13,324 shares at $6.11 of Sionna Therapeutics, Inc.⁶
• Oct 16, 2025Sold 200 shares at $34.00 of Sionna Therapeutics, Inc.⁷
• Oct 16, 2025Exercised options 200 shares at $6.11 of Sionna Therapeutics, Inc.⁷
• Oct 16, 2025Sold 10,225 shares at $31.46 of Sionna Therapeutics, Inc.⁷
• Oct 16, 2025Exercised options 10,225 shares at $6.11 of Sionna Therapeutics, Inc.⁷
• Oct 15, 2025Sold 14,775 shares at $31.11 of Sionna Therapeutics, Inc.⁷
• Oct 15, 2025Exercised options 14,775 shares at $6.11 of Sionna Therapeutics, Inc.⁷
• Sep 29, 2025Sold 7,793 shares at $29.70 of Sionna Therapeutics, Inc.⁸
• Sep 29, 2025Exercised options 7,793 shares at $6.11 of Sionna Therapeutics, Inc.⁸
• Sep 26, 2025Sold 17,207 shares at $28.85 of Sionna Therapeutics, Inc.⁸
• Sep 26, 2025Exercised options 17,207 shares at $6.11 of Sionna Therapeutics, Inc.⁸
• Aug 27, 2025Sold 7,426 shares at $25.01 of Sionna Therapeutics, Inc.⁹
• Aug 27, 2025Exercised options 7,426 shares at $6.11 of Sionna Therapeutics, Inc.⁹
• Aug 26, 2025Sold 17,574 shares at $24.96 of Sionna Therapeutics, Inc.⁹
• Aug 26, 2025Exercised options 17,574 shares at $6.11 of Sionna Therapeutics, Inc.⁹
• Aug 20, 2025Sold 25,000 shares at $22.75 of Sionna Therapeutics, Inc.¹⁰