MIAMI INTERNATIONAL HOLDINGS INC (MIAX) — insider trading
Financials · NYSE
MIAMI INTERNATIONAL HOLDINGS INC (MIAX) has 236 reported SEC Form 4 insider transactions in our data, including 29 open-market sales among the most recent 100 (latest 2026-10-02).
Recent Form 4 transactions
Showing the 100 most recent of 236 recorded transactions. See all on SEC EDGAR →
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 40,000 | — | $0 | Form 4 |
| 2026-10-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Open-market sale | 40,000 | $33.34 | $1.33M | Form 4 |
| 2026-10-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 40,000 | $12.00 | $480.0K | Form 4 |
| 2026-09-25 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 8,333 | — | $0 | Form 4 |
| 2026-09-25 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 8,333 | $12.00 | $100.0K | Form 4 |
| 2026-09-16 | Brown Shelly | Officer (EVP, Chief Strategy Officer) | Open-market sale | 21,217 | $38.61 | $819.2K | Form 4 |
| 2026-09-11 | Brown Shelly | Officer (EVP, Chief Strategy Officer) | Shares withheld for taxes / exercise cost | 16,283 | $42.54 | $692.7K | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 4,464 | — | $0 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 13,140 | — | $0 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 8,333 | — | $0 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 16,666 | — | $0 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 47,000 | — | $0 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 4,464 | $22.40 | $100.0K | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 13,140 | $15.22 | $200.0K | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 8,333 | $12.00 | $100.0K | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 16,666 | $12.00 | $200.0K | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 47,000 | $42.43 | $1.99M | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 47,000 | $12.00 | $564.0K | Form 4 |
| 2026-09-03 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion (derivative) | 11,000 | — | $0 | Form 4 |
| 2026-09-03 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Open-market sale | 11,000 | $42.21 | $464.3K | Form 4 |
| 2026-09-03 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion | 11,000 | $12.00 | $132.0K | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 4,666 | — | $0 | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 43,334 | — | $0 | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Open-market sale | 48,000 | $40.48 | $1.94M | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 4,666 | $12.00 | $56.0K | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 43,334 | $12.00 | $520.0K | Form 4 |
| 2026-09-02 | Teekell Judson Gray | Director | Open-market sale | 3,000 | $40.89 | $122.7K | Form 4 |
| 2026-09-02 | Teekell Judson Gray | Director | Open-market sale | 5,545 | $41.58 | $230.6K | Form 4 |
| 2026-09-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion (derivative) | 44,445 | — | $0 | Form 4 |
| 2026-09-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Open-market sale | 44,445 | $40.49 | $1.80M | Form 4 |
| 2026-09-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion | 44,445 | $12.00 | $533.3K | Form 4 |
| 2026-08-19 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 149,700 | $41.13 | $6.16M | Form 4 |
| 2026-08-18 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Shares withheld for taxes / exercise cost | 43,420 | $42.41 | $1.84M | Form 4 |
| 2026-08-18 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Shares withheld for taxes / exercise cost | 150,300 | $42.41 | $6.37M | Form 4 |
| 2026-08-17 | Emmons Lance | Officer (EVP and CFO) | Open-market sale | 35,000 | $42.83 | $1.50M | Form 4 |
| 2026-08-17 | Schwarzkopf Cynthia | Director | Option exercise / conversion (derivative) | 5,000 | — | $0 | Form 4 |
| 2026-08-17 | Schwarzkopf Cynthia | Director | Open-market sale | 5,000 | $42.85 | $214.3K | Form 4 |
| 2026-08-17 | Schwarzkopf Cynthia | Director | Option exercise / conversion | 5,000 | $12.00 | $60.0K | Form 4 |
| 2026-08-04 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 48,334 | — | $0 | Form 4 |
| 2026-08-04 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 48,334 | $45.69 | $2.21M | Form 4 |
| 2026-08-04 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 48,334 | $12.00 | $580.0K | Form 4 |
| 2026-08-04 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 48,000 | — | $0 | Form 4 |
| 2026-08-04 | Schafer Douglas M. JR | Officer (EVP and CIO) | Open-market sale | 48,000 | $45.71 | $2.19M | Form 4 |
| 2026-08-04 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 48,000 | $12.00 | $576.0K | Form 4 |
| 2026-08-04 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion (derivative) | 11,000 | — | $0 | Form 4 |
| 2026-08-04 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Open-market sale | 11,000 | $45.78 | $503.6K | Form 4 |
| 2026-08-04 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion | 11,000 | $12.00 | $132.0K | Form 4 |
| 2026-08-04 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion (derivative) | 44,445 | — | $0 | Form 4 |
| 2026-08-04 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Open-market sale | 44,445 | $45.69 | $2.03M | Form 4 |
| 2026-08-04 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion | 44,445 | $12.00 | $533.3K | Form 4 |
| 2026-08-04 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 5,832 | — | $0 | Form 4 |
| 2026-08-04 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 14,168 | — | $0 | Form 4 |
| 2026-08-04 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Open-market sale | 20,000 | $45.90 | $918.0K | Form 4 |
| 2026-08-04 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 5,832 | $15.22 | $88.8K | Form 4 |
| 2026-08-04 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 14,168 | $12.00 | $170.0K | Form 4 |
| 2026-08-04 | Teekell Judson Gray | Director | Open-market sale | 3,000 | $45.79 | $137.4K | Form 4 |
| 2026-08-04 | Eckert Kurt M. | Director | Option exercise / conversion (derivative) | 1,063 | — | $0 | Form 4 |
| 2026-08-04 | Eckert Kurt M. | Director | Open-market sale | 1,063 | $45.80 | $48.7K | Form 4 |
| 2026-08-04 | Eckert Kurt M. | Director | Option exercise / conversion | 1,063 | $12.00 | $12.8K | Form 4 |
| 2026-07-15 | Schwarzkopf Cynthia | Director | Option exercise / conversion (derivative) | 5,000 | — | $0 | Form 4 |
| 2026-07-15 | Schwarzkopf Cynthia | Director | Open-market sale | 5,000 | $42.00 | $210.0K | Form 4 |
| 2026-07-15 | Schwarzkopf Cynthia | Director | Option exercise / conversion | 5,000 | $12.00 | $60.0K | Form 4 |
| 2026-07-13 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 70,000 | — | $0 | Form 4 |
| 2026-07-13 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 70,000 | $42.52 | $2.98M | Form 4 |
| 2026-07-13 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 70,000 | $12.00 | $840.0K | Form 4 |
| 2026-07-13 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion (derivative) | 28,000 | — | $0 | Form 4 |
| 2026-07-13 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Open-market sale | 28,000 | $41.98 | $1.18M | Form 4 |
| 2026-07-13 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion | 28,000 | $12.00 | $336.0K | Form 4 |
| 2026-07-08 | BROWN DAVID A | Director | Shares withheld for taxes / exercise cost | 171 | $43.72 | $7.5K | Form 4 |
| 2026-07-07 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 28,228 | — | $0 | Form 4 |
| 2026-07-07 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 28,228 | $42.27 | $1.19M | Form 4 |
| 2026-07-07 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 28,228 | $12.00 | $338.7K | Form 4 |
| 2026-07-06 | Brown Shelly | Officer (EVP, Chief Strategy Officer) | Option exercise / conversion (derivative) | 16,000 | — | $0 | Form 4 |
| 2026-07-06 | Brown Shelly | Officer (EVP, Chief Strategy Officer) | Open-market sale | 16,000 | $42.13 | $674.1K | Form 4 |
| 2026-07-06 | Brown Shelly | Officer (EVP, Chief Strategy Officer) | Option exercise / conversion | 16,000 | $12.00 | $192.0K | Form 4 |
| 2026-07-06 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion (derivative) | 3,667 | — | $0 | Form 4 |
| 2026-07-06 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion (derivative) | 7,333 | — | $0 | Form 4 |
| 2026-07-06 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Open-market sale | 11,000 | $42.04 | $462.4K | Form 4 |
| 2026-07-06 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion | 3,667 | $12.00 | $44.0K | Form 4 |
| 2026-07-06 | Deitzel Edward | Officer (EVP, CRO, CCO MIAX Exchanges) | Option exercise / conversion | 7,333 | $12.00 | $88.0K | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 2,499 | — | $0 | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 16,667 | — | $0 | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion (derivative) | 834 | — | $0 | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Open-market sale | 20,000 | $42.12 | $842.4K | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 2,499 | $12.00 | $30.0K | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 16,667 | $12.00 | $200.0K | Form 4 |
| 2026-07-06 | Jayabalan Harish | Officer (EVP, CISO and CRO) | Option exercise / conversion | 834 | $12.00 | $10.0K | Form 4 |
| 2026-07-06 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion (derivative) | 41,772 | — | $0 | Form 4 |
| 2026-07-06 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Open-market sale | 41,772 | $42.09 | $1.76M | Form 4 |
| 2026-07-06 | Gallagher Thomas P. | Director, Officer (Chairman & CEO) | Option exercise / conversion | 41,772 | $12.00 | $501.3K | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 42,000 | — | $0 | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion (derivative) | 6,000 | — | $0 | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Open-market sale | 48,000 | $41.22 | $1.98M | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 42,000 | $12.00 | $504.0K | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | Officer (EVP and CIO) | Option exercise / conversion | 6,000 | $12.00 | $72.0K | Form 4 |
| 2026-07-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion (derivative) | 28,000 | — | $0 | Form 4 |
| 2026-07-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Open-market sale | 28,000 | $41.22 | $1.15M | Form 4 |
| 2026-07-02 | Comly Barbara J. | Officer (EVP, GC & Corporate Secretary) | Option exercise / conversion | 28,000 | $12.00 | $336.0K | Form 4 |
| 2026-07-02 | Eckert Kurt M. | Director | Option exercise / conversion (derivative) | 5,250 | — | $0 | Form 4 |
| 2026-07-02 | Eckert Kurt M. | Director | Open-market sale | 5,250 | $39.35 | $206.6K | Form 4 |
Ask the chat about MIAX's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: MIAMI INTERNATIONAL HOLDINGS INC (MIAX).
Last updated 2026-10-02 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.