MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) ownership: Top institutional holder: T. Rowe Price Investment Management, Inc. ($161.35M). Insider activity: Net Seller (0 buys, 20 sells). 1 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 4145618.00 | $161.35M | 2026-03-31 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | 3451549.00 | $134.33M | 2026-03-31 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3296346.00 | $128.29M | 2026-03-31 |
| BlackRock, Inc. | 2232680.00 | $86.90M | 2026-03-31 |
| VANGUARD GROUP INC | 1928286.00 | $85.58M | 2025-12-31 |
| CITADEL ADVISORS LLC | 1607780.00 | $62.57M | 2026-03-31 |
| Invesco Ltd. | 1585003.00 | $61.69M | 2026-03-31 |
| Alyeska Investment Group, L.P. | 1447454.00 | $56.33M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-11 | |
| Sell | null | 2026-06-09 | |
| Sell | null | 2026-06-09 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.