Miami International (MIAX)
Operates options-led exchanges spanning U.S. securities, futures, and international listings.
$36.76
After hours−0.01 (−0.01%)
At close$36.77(−2.84%)
Something off on this page? Send us feedback.
13F · 13D/G · Form 4
| Institutions | ≈ 75.46% | 71.62M shares | |
|---|---|---|---|
| 221 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 12.77% | 12.11M shares | |
| 26 holders · as of Sep 17, 2026 | |||
| Other | ≈ 11.77% | 11.17M shares | |
| remainder | |||
94.91M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
13F, as of Jun 30, 2026
221 holders · 71.62M shares · 54 new positions · 146 increased · 50 reduced · 42 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Horizon Kinetics Asset Management LLC | 7.84M | 8.26% | +4.39M | Aug 11, 2026 |
| BlackRock, Inc. | 5.07M | 5.34% | +2.84M | Aug 7, 2026 |
| T. Rowe Price Investment Management, Inc. | 5.03M | 5.30% | +887.4K | Aug 14, 2026 |
| Vanguard Portfolio Management LLC | 3.79M | 3.99% | +2.41M | Aug 13, 2026 |
| Susquehanna International Group, LLP | 3.36M | 3.54% | +58.7K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 3.17M | 3.34% | +1.75M | Aug 13, 2026 |
| Invesco Ltd. | 2.02M | 2.13% | +435.6K | Aug 14, 2026 |
| J Digital 6 LLC | 1.81M | 1.90% | +1.81Mnew | Aug 13, 2026 |
13D/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 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 16, 2026 | Shelly Brownofficer: EVP, Chief Strategy Officer | Sale | 21,217 | $38.61 | 316,490 |
| Sep 3, 2026 | Thomas P. Gallagherdirector, officer: Chairman & CEO | Sale | 47,000 | $42.43 | 1,423,275 |
| Sep 2, 2026 | Barbara J. Comlyofficer: EVP, GC & Corporate Secretary | Sale | 44,445 | $40.49 | 839,564 |
| Sep 2, 2026 | Douglas M. JR Schaferofficer: EVP and CIO | Sale | 48,000 | $40.48 | 387,414 |
| Sep 3, 2026 | Edward Deitzelofficer: EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $42.21 | 119,601 |
| Sep 2, 2026 | Judson Gray Teekelldirector | Sale · 2 lots | 8,545 | $41.34 | 150,251 |
| 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 |
House and Senate disclosures
Not reported.