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MIAX submitted a Form 144 disclosing an intended sale of 17,334 shares of Common Stock through exercise of stock options on 04/07/2026. The filing lists an aggregate value of $721,614.42 and an exchange of NYSE.
Separately, the filing shows recent 10b5-1 dispositions by Shelly Brown of 2,357 shares for $97,419.76 on 04/06/2026 and 25,932 shares for $1,019,979.58 on 03/23/2026. Shares outstanding are listed as 91,651,482 as of 04/07/2026.
Morgan Stanley Smith Barney LLC submitted a Form 144 reporting a sale of 25,932 shares of Common Stock by Shelly Brown pursuant to a 10b5-1 plan on 03/23/2026, generating $1,019,979.58 in proceeds. The filing lists 91,651,482 shares outstanding as of 04/06/2026.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported an open-market sale of 2,700 shares of Common Stock at $40.00 per share. After this transaction, he directly owns 59,338 shares. The trade was executed under a pre-established Rule 10b5-1 Plan adopted on December 17, 2025, indicating the sale was pre-planned rather than opportunistic.
MIAMI INTERNATIONAL HOLDINGS, INC. executive John Smollen reported a routine tax-related share disposition. On this Form 4, he surrendered 362 shares of common stock at $37.50 per share to the company to cover tax withholding tied to restricted stock awards. A footnote clarifies this was not an open-market sale by the reporting person. After this transaction, Smollen directly holds 170,757 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS EVP and Chief Strategy Officer Shelly Brown exercised stock options to acquire additional common shares. On March 30, 2026, she exercised multiple fully vested Incentive Stock Options, converting rights to buy 30,016 shares of Common Stock at strike prices ranging from $12.00 to $25.78 per share.
A total of 1,809 Common Stock shares were surrendered at $37.50 per share to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards, which the filing states does not represent a sale. Following these transactions, Brown directly owned 327,404 shares of Common Stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly reported a routine share disposition related to equity compensation. On this Form 4, 1,448 shares of common stock were surrendered to the company at $37.50 per share to cover tax withholding on vested restricted stock awards, which the footnote states does not represent a sale. After this tax-withholding transaction, she directly holds 843,844 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP, CRO and CCO of MIAX Exchanges, reported a routine tax-related share disposition. On March 30, 2026, 707 shares of common stock at $37.50 per share were surrendered to the company solely to cover tax withholding on vested restricted stock awards.
The footnote explains this transaction does not represent an open-market sale by Deitzel. After this tax-withholding event, he directly holds 116,221 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher reported an indirect tax-withholding disposition of 20,875 shares of Common Stock on March 30, 2026. The shares, held by Gallagher Investments, LLC, were surrendered to the company at $37.50 per share to cover tax obligations from restricted stock awards and did not involve an open-market sale. Following this transaction, indirect holdings reported through Gallagher Investments, LLC totaled 1,827,399 shares of Common Stock, over which Mr. Gallagher maintains beneficial ownership with voting and dispositive control.
MIAMI INTERNATIONAL HOLDINGS, INC. executive vice president and CFO Lance Emmons surrendered 8,350 shares of common stock at $37.50 per share on March 30, 2026 to cover tax obligations on restricted stock awards. This tax-withholding disposition was not an open-market sale, and Emmons now directly holds 119,262 shares.