MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)
$42.80-$1.05 (-2.38%) Today
Thomas P. Gallagher - Officer
Cynthia Schwarzkopf - Director
Harish Jayabalan - OfficerMiami International Holdings Inc is engaged in operating regulated financial marketplaces across multiple asset classes using proprietary technology platforms. The company operates exchange markets for options, equities, futures, and international listings through its MIAX Exchanges, MIAX Futures Exchange, and the Bermuda Stock Exchange. The company operates through four reportable segments: Options, which provides trading and market data services for listed equity and ETP options; Equities, which provides trading services for U.S. equities and ETPs; Futures, which provides futures trading and clearing services through MIAX Futures; and International, which provides listing services for capital market instruments through the Bermuda Stock Exchange and The International Stock Exchange.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 33 | 895,256 | $38.20M |
| Grant or award | 58 | 952,763 | |
| Option exercise | 70 | 1,447,684 | |
| Tax withholding / forfeiture | 7 | 237,191 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
135 Form 4 filings on record, the earliest from Aug 13, 2025, newest first. Filing history page 3 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC - 10% Owner | Other | Common Stock | 2,455,744 | $0.00 | - | |
| Judson Gray Teekell - Director | Option exercise | Common Stock | 22,667 | $12.00 | $272K | |
| Judson Gray Teekell - Director | Tax withholding / forfeiture | Common Stock | 4,991 | $54.51 | $272K | |
| Judson Gray Teekell - Director | Option exercise | Stock Option (Right to Buy) | 22,667 | $0.00 | - | |
| Lance Emmons - Officer | Open-market sale | Common Stock | 35,000 | $56.36 | $1.97M | |
| Thomas P. Gallagher - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 24,999 | $0.00 | - | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 24,999 | $12.00 | $300K | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 15,771 | $12.00 | $189K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 15,771 | $47.92 | $756K | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 15,771 | $0.00 | - | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 54,229 | $12.00 | $651K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 54,229 | $47.26 | $2.56M | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 54,229 | $0.00 | - | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 11,000 | $12.00 | $132K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 11,000 | $47.28 | $520K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 11,000 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Common Stock | 16,000 | $12.00 | $192K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 16,000 | $47.28 | $756K | |
| Shelly Brown - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 16,000 | $0.00 | - | |
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 3,000 | $47.30 | $142K | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Common Stock | 48,000 | $12.00 | $576K | |
| Douglas M. Schafer Jr. - Officer | Open-market sale | Common Stock | 48,000 | $47.25 | $2.27M | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 48,000 | $0.00 | - | |
| Kurt M. Eckert - Director | Option exercise | Common Stock | 5,625 | $12.00 | $68K | |
| Kurt M. Eckert - Director | Open-market sale | Common Stock | 5,625 | $47.29 | $266K | |
| Kurt M. Eckert - Director | Option exercise | Stock Option (Right to Buy) | 5,625 | $0.00 | - | |
| Barbara J. Comly - Officer | Option exercise | Common Stock | 28,000 | $12.00 | $336K | |
| Barbara J. Comly - Officer | Open-market sale | Common Stock | 28,000 | $47.26 | $1.32M | |
| Barbara J. Comly - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 28,000 | $0.00 | - | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 70,001 | $12.00 | $840K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 70,001 | $43.36 | $3.04M | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 104,124 | $43.36 | $4.51M | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 49,900 | $43.68 | $2.18M | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 70,001 | $0.00 | - | |
| Barbara J. Comly - Officer | Option exercise | Common Stock | 29,667 | $12.00 | $356K | |
| Barbara J. Comly - Officer | Open-market sale | Common Stock | 29,667 | $43.64 | $1.29M | |
| Barbara J. Comly - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 29,667 | $0.00 | - | |
 John Beckelman - Director | Option exercise | Common Stock | 8,667 | $12.00 | $104K | |
| John Beckelman - Director | Option exercise | Stock Option (Right to Buy) | 8,667 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Common Stock | 16,434 | $12.00 | $197K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 16,434 | $42.08 | $692K | |
| Shelly Brown - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 16,434 | $0.00 | - | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 762 | $12.00 | $9K | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 4,001 | $12.00 | $48K | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 7,572 | $12.00 | $91K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 7,572 | $42.02 | $318K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 762 | $0.00 | - | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 4,001 | $0.00 | - | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 762 | $42.00 | $32K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 4,001 | $42.00 | $168K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 7,572 | $0.00 | - | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 2,357 | $41.33 | $97K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 900 | $42.00 | $38K | |
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 2,700 | $40.00 | $108K | |
| John Smollen - Officer | Tax withholding / forfeiture | Common Stock | 362 | $37.50 | $14K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 8,333 | $12.00 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 6,570 | $15.22 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 6,195 | $16.14 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 3,878 | $25.78 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 5,040 | $19.84 | $100K | |
| Shelly Brown - Officer | Tax withholding / forfeiture | Common Stock | 1,809 | $37.50 | $68K | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 8,333 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 6,570 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 6,195 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 3,878 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 5,040 | $0.00 | - | |
| Barbara J. Comly - Officer | Tax withholding / forfeiture | Common Stock | 1,448 | $37.50 | $54K | |
| Edward Deitzel - Officer | Tax withholding / forfeiture | Common Stock | 707 | $37.50 | $27K | |
| Thomas P. Gallagher - Officer | Tax withholding / forfeiture | Common Stock | 20,875 | $37.50 | $783K | |
| Lance Emmons - Officer | Tax withholding / forfeiture | Common Stock | 8,350 | $37.50 | $313K | |
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 300 | $40.00 | $12K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 25,932 | $39.33 | $1.02M | |
| Kurt M. Eckert - Director | Option exercise | Common Stock | 12,917 | $12.00 | $155K | |
| Kurt M. Eckert - Director | Open-market sale | Common Stock | 37,917 | $39.00 | $1.48M | |
| Kurt M. Eckert - Director | Option exercise | Stock Option (Right to Buy) | 12,917 | $12.00 | $155K | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Common Stock | 48,000 | $12.00 | $576K | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 48,000 | $0.00 | - | |
| Douglas M. Schafer Jr. - Officer | Open-market sale | Common Stock | 48,000 | $39.74 | $1.91M | |
| Barbara J. Comly - Officer | Option exercise | Common Stock | 8,333 | $12.00 | $100K | |
| Barbara J. Comly - Officer | Option exercise | Common Stock | 8,333 | $12.00 | $100K | |
| Barbara J. Comly - Officer | Option exercise | Common Stock | 16,666 | $12.00 | $200K | |
| Barbara J. Comly - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 8,333 | $0.00 | - | |
| Barbara J. Comly - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 8,333 | $0.00 | - | |
| Barbara J. Comly - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 16,666 | $0.00 | - |
This is as far as the anonymous view goes. Create a free account for all 135 MIAX filings on record.
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| GALLAGHER INVESTMENTS LLC | Director, Officer | 149,700 | $6.27M | View on EDGAR | |
| Lance Emmons | Officer | 35,000 | $1.52M | View on EDGAR | |
| EDWARD DEITZEL | Officer | 44,000 | $2.06M | View on EDGAR |
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) had 60 insider filings in the last 90 days, with the most recent on 2026-08-20. The full record for MIAX runs to 135 Form 4 filings, the earliest from 2025-08-13. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of MIAX were filed in the last 90 days. 17 purchases are on record for this company.
33 insider sales of MIAX were filed in the last 90 days, totaling $38.20M.
This page tracks MIAX Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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