Insider Transactions Reported by 23 Insiders of MIAMI INTERNATIONAL HOLDINGS, INC.

Symbol
MIAX on NYSE
Location
Princeton, NJ

Insiders trading volume in the past year

MIAMI INTERNATIONAL HOLDINGS, INC. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
Murray Stahl Director $199,625,913 -$225,283 -0.11% 05 Mar 2026
Barbara J. Comly EVP, GC & Corporate Secretary $35,147,241 09 Mar 2026
Thomas P. Gallagher Chairman & CEO, Director $22,147,217 10 Feb 2026
Douglas M. Schafer Jr. EVP and CIO $16,220,286 18 Feb 2026
Shelly Brown EVP, Chief Strategy Officer $13,294,524 18 Feb 2026
Edward Deitzel EVP, CRO, CCO MIAX Exchanges $4,781,185 18 Feb 2026
Harish Jayabalan EVP, CISO and CRO $2,738,006 09 Sep 2025
Lance Emmons EVP and CFO $2,531,822 16 Dec 2025
John Smollen EVP Traded Products & Relation $1,993,428 11 Sep 2025
Cees Vermaas CEO of TISEG 13 Aug 2025
Lee Becker Director 13 Aug 2025
Kurt M. Eckert Director 15 Aug 2025
Mark F. Raymond Director 15 Aug 2025
Jamil Nazarali Director 13 Aug 2025
Judson Gray Teekell Director 15 Aug 2025
Jassim al Bahar Director 15 Aug 2025
Lisa Moore Director 13 Aug 2025
David A. Brown Director 15 Aug 2025
Cynthia Schwarzkopf Director 15 Aug 2025
John Beckelman Director 15 Aug 2025
Kenneth W. Lozier Director 13 Aug 2025
Mark I. Massad Director 13 Aug 2025
Paul Stahlin Director 15 Aug 2025

Recent Insider Transactions by Companies or Individuals for MIAMI INTERNATIONAL HOLDINGS, INC.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
Barbara J. Comly MIAX Common Stock Options Exercise 4.11% 33,332 845,292 09 Mar 2026 Direct
Barbara J. Comly MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -33,332 0 09 Mar 2026 Direct
Murray Stahl MIAX Common Stock Purchase 0.16% $310,176 $43.08 7,200 4,633,842 05 Mar 2026 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Common Stock Purchase 0.16% $312,336 $43.38 7,200 4,626,642 04 Mar 2026 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Common Stock Sale -1.15% $2,192,412 $40.92 -53,578 4,619,442 02 Mar 2026 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Common Stock Exercise of in-the-money or at-the-money derivative security 2.47% 112,656 4,673,020 02 Mar 2026 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -100% -112,656 0 02 Mar 2026 Horizon Kinetics Asset Management LLC
Douglas M. Schafer Jr. MIAX Common Stock Tax liability -7.59% -32,565 396,681 18 Feb 2026 Direct
Edward Deitzel MIAX Common Stock Tax liability -4.91% -6,035 116,928 18 Feb 2026 Direct
Shelly Brown MIAX Common Stock Tax liability -5.77% -19,902 325,129 18 Feb 2026 Direct
Douglas M. Schafer Jr. MIAX Common Stock Tax liability -20.2% -108,550 429,246 10 Feb 2026 Direct
Thomas P. Gallagher MIAX Common Stock Tax liability -8.55% -50,100 535,863 10 Feb 2026 Direct
Thomas P. Gallagher MIAX Common Stock Gift -0.34% -2,000 585,963 23 Dec 2025 Direct
Shelly Brown MIAX Common Stock Options Exercise 10.7% 33,332 345,031 16 Dec 2025 Direct
Shelly Brown MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -33,332 0 16 Dec 2025 Direct
Lance Emmons MIAX Common Stock Options Exercise 35.5% 33,456 127,612 16 Dec 2025 Direct
Lance Emmons MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -33,456 0 16 Dec 2025 Direct
Murray Stahl MIAX Common Stock Purchase 0.05% $99,999 $41.00 2,439 4,560,364 12 Dec 2025 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Common Stock Purchase $83.94 $41.97 2 4,557,925 03 Oct 2025 Horizon Kinetics Asset Management LLC
Murray Stahl MIAX Common Stock Purchase $167 $41.76 4 4,557,923 26 Sep 2025 Horizon Kinetics Asset Management LLC
John Smollen MIAX Common Stock Tax liability -27% -52,054 141,120 11 Sep 2025 Direct
John Smollen MIAX Common Stock Options Exercise 347.4% 150,000 193,174 11 Sep 2025 Direct
John Smollen MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -24,999 0 11 Sep 2025 Direct
John Smollen MIAX Nonqualified Stock Option (Right to Buy) Options Exercise -100% -125,001 0 11 Sep 2025 Direct
Edward Deitzel MIAX Common Stock Options Exercise 15.7% 16,666 122,963 11 Sep 2025 Direct
Edward Deitzel MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -16,666 0 10 Sep 2025 Direct
Shelly Brown MIAX Common Stock Tax liability -4.96% -16,283 311,699 10 Sep 2025 Direct
Edward Deitzel MIAX Common Stock Tax liability -26.4% -38,090 106,297 09 Sep 2025 Direct
Edward Deitzel MIAX Common Stock Options Exercise 76.3% 62,500 144,387 09 Sep 2025 Direct
Edward Deitzel MIAX Nonqualified Stock Option (Right to Buy) Options Exercise -100% -62,500 0 09 Sep 2025 Direct
Harish Jayabalan MIAX Common Stock Tax liability -2.63% -1,980 73,405 09 Sep 2025 Direct
Harish Jayabalan MIAX Common Stock Options Exercise 49.6% 25,000 75,385 09 Sep 2025 Direct
Harish Jayabalan MIAX Nonqualified Stock Option (Right to Buy) Options Exercise -100% -3,001 0 09 Sep 2025 Direct
Harish Jayabalan MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -21,999 0 09 Sep 2025 Direct
Murray Stahl MIAX Common Stock Purchase 0.76% $1,244,367 $36.10 34,470 4,557,919 28 Aug 2025 Horizon Kinetics Asset Management LLC
Shelly Brown MIAX Common Stock Tax liability -3.26% -11,047 327,982 26 Aug 2025 Direct
Thomas P. Gallagher MIAX Common Stock Tax liability -9.42% -192,220 1,848,274 26 Aug 2025 By Gallagher Investments, LLC
Paul Stahlin MIAX Common Stock Conversion of derivative security 2408.3% 24,083 25,083 15 Aug 2025 Direct
Paul Stahlin MIAX Stock Option (Right to Buy) Options Exercise 101,389 22,500 15 Aug 2025 Direct
Paul Stahlin MIAX Stock Option (Right to Buy) Options Exercise -100% -101,389 0 15 Aug 2025 Direct
Paul Stahlin MIAX Nonvoting Common Stock Conversion of derivative security -100% -14,083 0 15 Aug 2025 Direct
Paul Stahlin MIAX Series B Preferred Stock Conversion of derivative security -100% -10,000 0 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Common Stock Conversion of derivative security 258.5% 387,796 537,796 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Nonqualified Stock Option (Right to Buy) Options Exercise 763,624 200,000 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Nonqualified Stock Option (Right to Buy) Options Exercise -100% -763,624 0 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Incentive Stock Option (Right to Buy) Options Exercise 36,376 19,710 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Incentive Stock Option (Right to Buy) Options Exercise -100% -36,376 0 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Nonvoting Common Stock Conversion of derivative security -100% -387,296 0 15 Aug 2025 Direct
Douglas M. Schafer Jr. MIAX Series B Preferred Stock Conversion of derivative security -100% -500 0 15 Aug 2025 Direct
John Smollen MIAX Common Stock Conversion of derivative security 91,666 91,666 15 Aug 2025 Held by Quivetneck Capital LLC of which Mr. Smollen is a managing member
* An asterisk sign (*) next to the price indicates that the price is likely invalid.