Thomas P. Gallagher sold $2M of Miami International Holdings, Inc. (MIAX) stock

Thomas P. Gallagher, Chairman & CEO of Miami International Holdings, Inc. (MIAX), sold 47,000 shares of MIAX stock worth $2M, per an SEC Form 4 filed Sep 4, 2026.

The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.

The trade happened on Sep 3, 2026, 1 day before it was made public.

MIAX has moved -11.4% since the trade date, from $42.71 to $37.84 (Sep 21, 2026 close).