Thomas P. Gallagher
CIK: 0002080477
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
MIAMI INTERNATIONAL HOLDINGS, INC.
Discretionary Trading P&L
Holdings
Transaction History (54 total)
- Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect47K shares at avg. $42.43$2.0M - Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Direct13.1K shares at avg. $15.22$200K - Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect47K shares at avg. $12.00$564K - Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Direct8.3K shares at avg. $12.00$100K - Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Direct16.7K shares at avg. $12.00$200K - Sep 3, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Direct4.5K shares at avg. $22.40$100K - Aug 19, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect149.7K shares at avg. $41.13$6.2M - Aug 18, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Tax Payment(F)Indirect150.3K shares at avg. $42.41$6.4M - Aug 4, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect48.3K shares at avg. $45.69$2.2M - Aug 4, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect48.3K shares at avg. $12.00$580K - Jul 13, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect70K shares at avg. $12.00$840K - Jul 13, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect70K shares at avg. $42.52$3.0M - Jul 7, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect28.2K shares at avg. $42.27$1.2M - Jul 7, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect28.2K shares at avg. $12.00$339K - Jul 6, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect41.8K shares at avg. $42.09$1.8M - Jul 6, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect41.8K shares at avg. $12.00$501K - Jun 16, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Award(A)Direct233K shares- - Jun 2, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect70K shares at avg. $12.00$840K - Jun 2, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect70K shares at avg. $42.36$3.0M - May 11, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Direct25K shares at avg. $12.00$300K - May 5, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect15.8K shares at avg. $47.92$756K - May 5, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect15.8K shares at avg. $12.00$189K - May 4, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Indirect54.2K shares at avg. $47.26$2.6M - May 4, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Exercise(M)Indirect54.2K shares at avg. $12.00$651K - Apr 15, 2026MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Sale(S)Direct49.9K shares at avg. $43.68$2.2M
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 47,000 | $42.43 | $1,994,210 | Indirect |
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 13,140 | $15.22 | $199,991 | Direct |
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 47,000 | $12.00 | $564,000 | Indirect |
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 8,333 | $12.00 | $99,996 | Direct |
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 16,666 | $12.00 | $199,992 | Direct |
| Sep 3, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 4,464 | $22.40 | $99,994 | Direct |
| Aug 19, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 149,700 | $41.13 | $6,157,161 | Indirect |
| Aug 18, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Tax Payment(F) | 150,300 | $42.41 | $6,374,223 | Indirect |
| Aug 4, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 48,334 | $45.69 | $2,208,380 | Indirect |
| Aug 4, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 48,334 | $12.00 | $580,008 | Indirect |
| Jul 13, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 70,000 | $12.00 | $840,000 | Indirect |
| Jul 13, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 70,000 | $42.52 | $2,976,400 | Indirect |
| Jul 7, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 28,228 | $42.27 | $1,193,198 | Indirect |
| Jul 7, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 28,228 | $12.00 | $338,736 | Indirect |
| Jul 6, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 41,772 | $42.09 | $1,758,183 | Indirect |
| Jul 6, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 41,772 | $12.00 | $501,264 | Indirect |
| Jun 16, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Award(A) | 232,977 | - | $0 | Direct |
| Jun 2, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 70,000 | $12.00 | $840,000 | Indirect |
| Jun 2, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 70,000 | $42.36 | $2,965,200 | Indirect |
| May 11, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 24,999 | $12.00 | $299,988 | Direct |
| May 5, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 15,771 | $47.92 | $755,746 | Indirect |
| May 5, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 15,771 | $12.00 | $189,252 | Indirect |
| May 4, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 54,229 | $47.26 | $2,562,863 | Indirect |
| May 4, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Exercise(M) | 54,229 | $12.00 | $650,748 | Indirect |
| Apr 15, 2026 | MIAX MIAMI INTERNATIONAL HOLDINGS, INC. | Sale(S) | 49,900 | $43.68 | $2,179,632 | Direct |
1-25 of 54 transactions
About Gallagher Thomas P.
Gallagher Thomas P. (SEC CIK 0002080477) files insider reports with the SEC as Chairman & CEO of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
Signal8 holds 18 ownership filings by Gallagher Thomas P. (1 Form 3, 17 Form 4), filed between Aug 13, 2025 and Sep 4, 2026. Those filings report 54 transactions, from Aug 13, 2025 to Sep 3, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Gallagher Thomas P.'s filings is in PRINCETON, NJ.
Recent filings by Gallagher Thomas P.
- Sep 3, 2026: Open-market sale of MIAX shares (Form 4, code S).
- Sep 3, 2026: Option exercises of MIAX shares (5 lines, Form 4, code M).
- Aug 19, 2026: Open-market sale of MIAX shares (Form 4, code S).
- Aug 18, 2026: Tax withholding of MIAX shares (Form 4, code F).
- Aug 4, 2026: Open-market sale of MIAX shares (Form 4, code S).
Other insiders filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)
- Comly Barbara J., EVP, GC & Corporate Secretary
- Schafer Douglas M. JR, EVP and CIO
- Jayabalan Harish, EVP, CISO and CRO
- Brown Shelly, EVP, Chief Strategy Officer
- Deitzel Edward, EVP, CRO, CCO MIAX Exchanges
- Teekell Judson Gray, Director