MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
NYSE · Financial Services · Financial - Capital Markets · US
$42.44
−0.63%0
Insider buys (3m)
26
Insider sells (3m)
-$30.5M
Net value (3m)
+7.8%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Aug 20, 2026 | Comly Barbara J. · officer: EVP, GC & Corporate Secretary | F-InKind | 43,420 | $42 |
| Aug 20, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | Sale | 149,700 | $41 |
| Aug 20, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | F-InKind | 150,300 | $42 |
| Aug 19, 2026 | Emmons Lance · officer: EVP and CFO | Sale | 35,000 | $43 |
| Aug 19, 2026 | Schwarzkopf Cynthia · director | Sale | 5,000 | $43 |
| Aug 19, 2026 | Schwarzkopf Cynthia · director | M-Exempt | 5,000 | $12 |
| Aug 6, 2026 | Deitzel Edward · officer: EVP, CRO, CCO MIAX Exchanges | M-Exempt | 11,000 | $12 |
| Aug 6, 2026 | Comly Barbara J. · officer: EVP, GC & Corporate Secretary | Sale | 44,445 | $46 |
| Aug 6, 2026 | Jayabalan Harish · officer: EVP, CISO and CRO | Sale | 20,000 | $46 |
| Aug 6, 2026 | Jayabalan Harish · officer: EVP, CISO and CRO | M-Exempt | 5,832 | $15 |
| Aug 6, 2026 | Jayabalan Harish · officer: EVP, CISO and CRO | M-Exempt | 14,168 | $12 |
| Aug 6, 2026 | Teekell Judson Gray · director | Sale | 3,000 | $46 |
| Aug 6, 2026 | Eckert Kurt M. · director | Sale | 1,063 | $46 |
| Aug 6, 2026 | Comly Barbara J. · officer: EVP, GC & Corporate Secretary | M-Exempt | 44,445 | $12 |
| Aug 6, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | Sale | 48,334 | $46 |
| Aug 6, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | M-Exempt | 48,334 | $12 |
| Aug 6, 2026 | Schafer Douglas M. JR · officer: EVP and CIO | Sale | 48,000 | $46 |
| Aug 6, 2026 | Schafer Douglas M. JR · officer: EVP and CIO | M-Exempt | 48,000 | $12 |
| Aug 6, 2026 | Deitzel Edward · officer: EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $46 |
| Aug 6, 2026 | Eckert Kurt M. · director | M-Exempt | 1,063 | $12 |
| Jul 16, 2026 | Schwarzkopf Cynthia · director | M-Exempt | 5,000 | $12 |
| Jul 16, 2026 | Schwarzkopf Cynthia · director | Sale | 5,000 | $42 |
| Jul 14, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | M-Exempt | 70,000 | $12 |
| Jul 14, 2026 | Comly Barbara J. · officer: EVP, GC & Corporate Secretary | M-Exempt | 28,000 | $12 |
| Jul 14, 2026 | Comly Barbara J. · officer: EVP, GC & Corporate Secretary | Sale | 28,000 | $42 |
| Jul 14, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | Sale | 70,000 | $43 |
| Jul 9, 2026 | BROWN DAVID A · director | F-InKind | 171 | $44 |
| Jul 7, 2026 | Gallagher Thomas P. · director, officer: Chairman & CEO | Sale | 41,772 | $42 |
| Jul 7, 2026 | Schafer Douglas M. JR · officer: EVP and CIO | Sale | 48,000 | $41 |
| Jul 7, 2026 | Schafer Douglas M. JR · officer: EVP and CIO | M-Exempt | 42,000 | $12 |
Institutional positioning
13F filings over the trailing two quarters
New 133Increased 175Reduced 77Sold out 39
| Filer | Action | Shares | Filed |
|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | Increased | 7,842,173 | Aug 11, 2026 |
| BlackRock, Inc. | Increased | 5,071,754 | Aug 7, 2026 |
| T. Rowe Price Investment Management, Inc. | Increased | 5,032,970 | Aug 14, 2026 |
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 4,145,618 | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 3,795,543 | Aug 14, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 3,786,418 | Aug 13, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 3,615,646 | May 15, 2026 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | Increased | 3,451,549 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 3,165,686 | Aug 13, 2026 |
| BLACKROCK, INC. | Increased | 2,232,680 | May 13, 2026 |
| Invesco Ltd. | Increased | 2,020,650 | Aug 14, 2026 |
| J Digital 6 LLC | New Position | 1,807,234 | Aug 13, 2026 |
| BLAIR WILLIAM & CO/IL | Increased | 1,769,432 | Aug 11, 2026 |
| CITADEL ADVISORS LLC | Increased | 1,693,480 | May 15, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | New Position | 1,682,924 | Aug 14, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Aug 20, 2026