Michael Cloonan owns 1.69% of Sionna Therapeutics
765,393 shares as of the September 17, 2026 filing, worth $3M at the latest close.
SION · $176M market capGet an email when Michael Cloonan’s stake moves.
Free.
The stake
1.69%
worth $3M at the latest close
Stake rank
#2,344
by dollar value of the stake
Last sale
None
no sales since 2016
Last buy
None
no purchases since 2016
Michael Cloonan owns 1.69% of Sionna Therapeutics, Inc.: 765,393 of 45,212,399 shares, worth about $3M at the 2026-10-16 close. The stake has moved from 1.24% in 2025 to 1.69% on 2026-09-17.
How the stake is held
as of the Sep 17, 2026 filing
SHARES
OF THE STAKE
COMMON STOCK · stated Sep 17, 2026 · Form 4 ↗
HELD DIRECTLY
765,393
100.0%
THE STAKE
765,393
1.69%