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Miami International Holdings, Inc.

MIAX
Exchange
NYSE
Industry
Security Brokers, Dealers & Flotation Companies
SEC CIK
0001438472

In the last 90 days, Miami International Holdings, Inc. insiders filed 0 open-market purchases and 27 sales; 206 institutions reported holding it in 13F filings for Q2 2026, worth $2.68B in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Miami International Holdings, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
27 filings
10 insiders, $36.0M in total
Insiders trading
10
Net value
−$36.0M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Miami International Holdings, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Miami International Holdings, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Brown ShellyEVP, Chief Strategy Officer316,490Sep 17, 202614
Gallagher Thomas P.Chairman & CEO786,542Sep 4, 202614
Comly Barbara J.EVP, GC & Corporate Secretary839,564Sep 4, 202611
Deitzel EdwardEVP, CRO, CCO MIAX Exchanges119,601Sep 4, 202610
Schafer Douglas M. JREVP and CIO387,414Sep 4, 202610
Teekell Judson GrayDirector69,251Sep 4, 20269
Schwarzkopf CynthiaDirector88,545Aug 19, 20264
Emmons LanceEVP and CFO86,538Aug 19, 20265
Eckert Kurt M.Director149,612Aug 6, 20266
Jayabalan HarishEVP, CISO and CRO78,065Aug 6, 20264
Brown David ADirector7,066Jul 9, 20262
Vermaas CeesCEO of TISEG4,660Jun 18, 20261
Smollen JohnEVP, New Product Development178,212Jun 18, 20262
Sommers Jill E.Director6,083Jun 17, 20261
Stahlin PaulDirector42,143Jun 17, 20262
Sites EricDirector5,684Jun 17, 20261
Raymond Mark F.Director67,064Jun 17, 20261
Beckelman JohnDirector15,904Jun 17, 20262
Al-Bahar Talal JassimDirector40,891Jun 17, 20261
Massad Mark I.Director10,737Jun 17, 20261
Lozier Kenneth W.Director8,237Jun 17, 20261
Becker LeeDirector2,267Jun 17, 20261
Moore LisaDirector12,737Jun 17, 20261
Horizon Kinetics Asset Management LLC10% Owner2,170,898IndirectMay 21, 20268
Stahl MurrayDirector4,633,842IndirectMar 6, 20267
Nazarali JamilDirector2,500Aug 15, 20250

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Aug 15, 2025 (view filing)Aug 132 daysMassad Mark I.DirectorPPurchase+3.50K$23.00+$80.5KNew position3.50K after
Aug 15, 2025 (view filing)Aug 132 daysMassad Mark I.DirectorPPurchase+4.50K$23.00+$103.5KNew position500 after3 lots
Aug 15, 2025 (view filing)Aug 132 daysLozier Kenneth W.DirectorPPurchase+1.00K$23.00+$23.0KNew position1.00K after
Aug 15, 2025 (view filing)Aug 132 daysGallagher Thomas P.Chairman & CEOPPurchase+12.0K$23.00+$276.0KNew position12.0K after
Aug 15, 2025 (view filing)Aug 132 daysDeitzel EdwardEVP, CRO, CCO MIAX ExchangesPPurchase+100$23.00+$2.30K+0.3%32.2K after
Aug 15, 2025 (view filing)Aug 132 daysSmollen JohnEVP Traded Products & RelationPPurchase+5.00K$23.00+$115.0K+224.6%7.23K after
Aug 15, 2025 (view filing)Aug 132 daysNazarali JamilDirectorPPurchase+2.50K$23.00+$57.5KNew position2.50K after
Aug 15, 2025 (view filing)Aug 132 daysStahlin PaulDirectorPPurchase+1.00K$23.00+$23.0KNew position1.00K after
Aug 15, 2025 (view filing)Aug 132 daysJayabalan HarishEVP, CISO and CROPPurchase+2.50K$23.00+$57.5K+63.4%6.44K after
Aug 15, 2025 (view filing)Aug 132 daysMoore LisaDirectorPPurchase+5.50K$23.00+$126.5KNew position5.50K after
Aug 18, 2025 (view filing)Aug 144 daysEmmons LanceEVP and CFOPPurchase+4$31.44+$125.76New position4 after
Sep 30, 2025 (view filing)2:28 PM ETAug 2833 daysLateStahl Murray and 1 otherDirectorPPurchase+34.5K$36.10+$1.24M+0.8%4.56M after
Sep 30, 2025 (view filing)3:17 PM ETSep 264 daysStahl Murray and 1 otherDirectorPPurchase+4$41.76+$167.040.0%4.56M after
Oct 6, 2025 (view filing)4:20 PM ETOct 33 daysStahl Murray and 1 otherDirectorPPurchase+2$41.97+$83.940.0%4.56M after
Dec 15, 2025 (view filing)3:53 PM ETDec 123 daysStahl Murray and 1 otherDirectorPPurchase+2.44K$41.00+$100.0K+0.1%4.56M after
Mar 6, 2026 (view filing)4:12 PM ETMar 24 daysStahl Murray and 1 otherDirectorSSale−53.6K$40.92−$2.19M−1.1%4.62M afterAmended
Mar 6, 2026 (view filing)5:52 PM ETMar 42 daysStahl Murray and 1 otherDirectorPPurchase+7.20K$43.38+$312.3K+0.2%4.63M afterAmended
Mar 6, 2026 (view filing)5:57 PM ETMar 51 dayStahl Murray and 1 otherDirectorPPurchase+7.20K$43.08+$310.2K+0.2%4.63M after
Mar 18, 2026 (view filing)Mar 171 daySchafer Douglas M. JREVP and CIOSSale−48.0K$39.74−$1.91M−10.8%396.7K after10b5-1
Mar 20, 2026 (view filing)Mar 191 dayEckert Kurt M.DirectorSSale−37.9K$39.00−$1.48M−21.0%142.4K after10b5-1
Mar 24, 2026 (view filing)Mar 231 dayBrown ShellyEVP, Chief Strategy OfficerSSale−25.9K$39.33−$1.02M−8.0%299.2K after10b5-1
Mar 26, 2026 (view filing)Mar 251 dayTeekell Judson GrayDirectorSSale−300$40.00−$12.0K−0.5%62.0K after
Apr 3, 2026 (view filing)Apr 21 dayTeekell Judson GrayDirectorSSale−2.70K$40.00−$108.0K−4.4%59.3K after10b5-1
Apr 9, 2026 (view filing)Apr 6-73 daysBrown ShellyEVP, Chief Strategy OfficerSSale−3.26K$41.52−$135.2K−1.0%325.0K afterAmended2 lots10b5-1
Apr 9, 2026 (view filing)Apr 81 dayBrown ShellyEVP, Chief Strategy OfficerSSale−16.4K$42.08−$691.5K−4.8%325.0K after10b5-1
Apr 9, 2026 (view filing)Apr 7-82 daysDeitzel EdwardEVP, CRO, CCO MIAX ExchangesSSale−12.3K$42.01−$518.2K−9.6%116.2K after3 lots10b5-1
Apr 17, 2026 (view filing)Apr 152 daysComly Barbara J.EVP, GC & Corporate SecretarySSale−29.7K$43.64−$1.29M−3.4%843.8K after10b5-1
Apr 17, 2026 (view filing)Apr 152 daysGallagher Thomas P.Chairman & CEOSSale−174.1K$43.36−$7.55M−9.2%1.72M after2 lots10b5-1
Apr 17, 2026 (view filing)Apr 152 daysGallagher Thomas P.Chairman & CEOSSale−49.9K$43.68−$2.18M−9.3%486.0K after10b5-1
May 5, 2026 (view filing)May 41 dayDeitzel EdwardEVP, CRO, CCO MIAX ExchangesSSale−11.0K$47.28−$520.1K−8.6%116.2K after10b5-1
May 5, 2026 (view filing)May 41 dayGallagher Thomas P.Chairman & CEOSSale−54.2K$47.26−$2.56M−3.1%1.72M after10b5-1
May 5, 2026 (view filing)May 41 dayTeekell Judson GrayDirectorSSale−3.00K$47.30−$141.9K−5.1%56.3K after10b5-1
May 5, 2026 (view filing)May 41 daySchafer Douglas M. JREVP and CIOSSale−48.0K$47.25−$2.27M−10.8%396.7K after10b5-1
May 5, 2026 (view filing)May 41 dayBrown ShellyEVP, Chief Strategy OfficerSSale−16.0K$47.28−$756.5K−4.7%325.0K after10b5-1
May 5, 2026 (view filing)May 41 dayEckert Kurt M.DirectorSSale−5.63K$47.29−$266.0K−3.8%142.4K after10b5-1
May 5, 2026 (view filing)May 41 dayComly Barbara J.EVP, GC & Corporate SecretarySSale−28.0K$47.26−$1.32M−3.2%843.8K after10b5-1
May 7, 2026 (view filing)May 52 daysGallagher Thomas P.Chairman & CEOSSale−15.8K$47.92−$755.7K−0.9%1.72M after10b5-1
May 18, 2026 (view filing)May 153 daysEmmons LanceEVP and CFOSSale−35.0K$56.36−$1.97M−29.3%84.3K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysTeekell Judson GrayDirectorSSale−3.00K$42.78−$128.3K−4.1%71.0K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysSchafer Douglas M. JREVP and CIOSSale−48.0K$42.84−$2.06M−10.8%396.7K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysGallagher Thomas P.Chairman & CEOSSale−70.0K$42.36−$2.97M−3.9%1.72M after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysBrown ShellyEVP, Chief Strategy OfficerSSale−16.0K$42.12−$673.9K−4.7%325.0K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysDeitzel EdwardEVP, CRO, CCO MIAX ExchangesSSale−11.0K$42.16−$463.8K−8.6%116.2K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysEckert Kurt M.DirectorSSale−5.25K$42.76−$224.5K−3.6%142.4K after10b5-1
Jun 4, 2026 (view filing)Jun 22 daysComly Barbara J.EVP, GC & Corporate SecretarySSale−28.0K$42.85−$1.20M−3.2%843.8K after10b5-1
Jun 10, 2026 (view filing)Jun 8-92 daysJayabalan HarishEVP, CISO and CROSSale−20.0K$40.08−$801.6K−21.4%73.4K after2 lots10b5-1
Jun 12, 2026 (view filing)Jun 111 daySchwarzkopf CynthiaDirectorSSale−19.5K$41.73−$813.7K−19.3%81.3K after10b5-1
Jun 17, 2026 (view filing)Jun 152 daysBrown ShellyEVP, Chief Strategy OfficerSSale−4.71K$44.23−$208.5K−1.5%316.7K after10b5-1
Jul 7, 2026 (view filing)4:06 PM ETJul 25 daysSchafer Douglas M. JREVP and CIOSSale−48.0K$41.22−$1.98M−11.0%387.4K after10b5-1
Jul 7, 2026 (view filing)4:06 PM ETJul 25 daysComly Barbara J.EVP, GC & Corporate SecretarySSale−28.0K$41.22−$1.15M−3.1%883.0K after10b5-1