Miami International
Operates options-led exchanges spanning U.S. securities, futures, and international listings.
$42.80
After-hours close−0.20 (−0.47%)
At close$43.00(−2.38%)
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Breakdown13F · Form 4
Institutions 75.35%72.93M sharesInsiders 13.98%13.53M sharesOther 10.67%10.32M shares
Shares outstanding 96.79M · Float 86.27M · 89.1% free float
Institutions13F, as of Jun 30, 2026
219 holders · 72.93M shares · 53 new positions · 145 increased · 48 reduced · 43 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Horizon Kinetics Asset Management LLC | 7.84M | 8.10% | +4.39M | Aug 11, 2026 |
| BlackRock, Inc. | 5.07M | 5.24% | +2.84M | Aug 7, 2026 |
| T. Rowe Price Investment Management, Inc. | 5.03M | 5.20% | +887.4K | Aug 14, 2026 |
| Vanguard Portfolio Management LLC | 3.79M | 3.91% | +2.41M | Aug 13, 2026 |
| Susquehanna International Group, LLP | 3.36M | 3.47% | +58.7K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 3.17M | 3.27% | +1.75M | Aug 13, 2026 |
| Invesco Ltd. | 2.02M | 2.09% | +435.6K | Aug 14, 2026 |
| J Digital 6 LLC | 1.81M | 1.87% | +1.81Mnew | Aug 13, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Horizon Kinetics Asset Management LLCincl. Horizon Kinetics Holding Corp | 7.80% | 7.40M | 13D | May 21, 2026 ↗ |
| T. Rowe Price Investment Management, Inc. | 5.30% | 5.03M | 13G | Aug 14, 2026 ↗ |
| BlackRock, Inc. | 5.10% | 4.95M | 13G | Jul 29, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Murray Stahl | director | 4.63M | 4.79% | Mar 6, 2026 |
| Talal Jassim Al-Bahar | director | 3.66M | 3.78% | Jun 17, 2026 |
| Horizon Kinetics Asset Management LLC | 10 percent owner | 2.17M | 2.24% | May 21, 2026 |
| Thomas P. Gallagher | director, officer: Chairman & CEO | 2.17M | 2.24% | Aug 20, 2026 |
| Barbara J. Comly | officer: EVP, GC & Corporate Secretary | 839.6K | 0.87% | Aug 20, 2026 |
| Douglas M. JR Schafer | officer: EVP and CIO | 387.4K | 0.40% | Aug 6, 2026 |
| Abdulwahab A. Alnakib | director | 360.8K | 0.37% | Jun 18, 2026 |
| Shelly Brown | officer: EVP, Chief Strategy Officer | 354.0K | 0.37% | Jul 7, 2026 |
| John Smollen | officer: EVP, New Product Development | 269.9K | 0.28% | Jun 18, 2026 |
| Judson Gray Teekell | director | 158.8K | 0.16% | Aug 6, 2026 |
1 ten-percent owner holds 2.17M shares by Form 4 — the 13D/G table above shows that stake, the figure above counts officers and directors only
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 19, 2026 | Thomas P. Gallagherdirector, officer: Chairman & CEO | Sale | 149,700 | $41.13 | 1,423,275 |
| Aug 17, 2026 | Cynthia Schwarzkopfdirector | Sale | 5,000 | $42.85 | 88,545 |
| Aug 17, 2026 | Lance Emmonsofficer: EVP and CFO | Sale | 35,000 | $42.83 | 86,538 |
| Aug 4, 2026 | Thomas P. Gallagherdirector, officer: Chairman & CEO | Sale | 48,334 | $45.69 | 1,723,275 |
| Aug 4, 2026 | Douglas M. JR Schaferofficer: EVP and CIO | Sale | 48,000 | $45.71 | 387,414 |
| Aug 4, 2026 | Edward Deitzelofficer: EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $45.78 | 119,601 |
| Aug 4, 2026 | Barbara J. Comlyofficer: EVP, GC & Corporate Secretary | Sale | 44,445 | $45.69 | 882,984 |
| Aug 4, 2026 | Harish Jayabalanofficer: EVP, CISO and CRO | Sale | 20,000 | $45.90 | 78,065 |
| Aug 4, 2026 | Judson Gray Teekelldirector | Sale | 3,000 | $45.79 | 72,251 |
| Aug 4, 2026 | Kurt M. Eckertdirector | Sale | 1,063 | $45.80 | 149,612 |
CongressHouse and Senate disclosures
Not reported.