Miami International Holdings, Inc. (MIAX)
Who owns Miami International Holdings, Inc. (MIAX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 91.9% of the shares are freely tradable; institutional investors hold 57.4%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| T. Rowe Price Investment Management,Inc. | 4.37 | 4,145,618 | +17.2 | 03/31/2026 |
| Horizon Asset Management Inc/ny | 3.64 | 3,451,549 | +89.7 | 03/31/2026 |
| Susquehanna International Group, LLP | 3.47 | 3,296,346 | +0.3 | 03/31/2026 |
| BlackRock Inc | 2.35 | 2,232,680 | +27.3 | 03/31/2026 |
| Vanguard Group Inc | 2.03 | 1,928,286 | +39.5 | 12/31/2025 |
| Citadel Advisors Llc | 1.69 | 1,607,780 | +159.5 | 03/31/2026 |
| Amvescap Plc. | 1.67 | 1,585,003 | +23.9 | 03/31/2026 |
| Alyeska Investment Group, L.P. | 1.53 | 1,447,454 | +12.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 1.49 | 1,414,979 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| T. Rowe Price US Small-Cap Core Equity | 1.48 | 1,408,404 | +33.1 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 15. Jul 2026 | Schwarzkopf Cynthia | Director | Sell | 5,000 | 42.00 | 210,000 |
| 15. Jul 2026 | Schwarzkopf Cynthia | Director | Other | 5,000 | 12.00 | 60,000 |
| 13. Jul 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 28,000 | 41.98 | 1,175,440 |
| 13. Jul 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Other | 28,000 | 12.00 | 336,000 |
| 13. Jul 2026 | Gallagher Thomas P. | Chairman & CEO | Sell | 70,000 | 42.52 | 2,976,400 |
| 13. Jul 2026 | Gallagher Thomas P. | Chairman & CEO | Other | 70,000 | 12.00 | 840,000 |
| 8. Jul 2026 | Brown David A | Director | Other | 171 | 43.72 | 7,476 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.