MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) Insider Trading
Over the last 3 months, MIAX insiders made 0 open-market buys and 31 sales, a net sale of -$32.6M (SEC Form 4). Over the last 6 months, 145 institutions increased and 49 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
31
Net (3m)
-$32.6M
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Context3-month price -4.5%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 18, 2026 | Vermaas Ceesofficer: CEO of TISEG | Grant | 4,660 | — |
| Jun 18, 2026 | Gallagher Thomas P.director, officer: Chairman & CEO | Grant | 237,175 | $40.24 |
| Jun 18, 2026 | Gallagher Thomas P.director, officer: Chairman & CEO | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Gallagher Thomas P.director, officer: Chairman & CEO | Grant | 232,977 | — |
| Jun 18, 2026 | Comly Barbara J.officer: EVP, GC & Corporate Secretary | Grant | 37,778 | $40.24 |
| Jun 18, 2026 | Comly Barbara J.officer: EVP, GC & Corporate Secretary | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Comly Barbara J.officer: EVP, GC & Corporate Secretary | Grant | 39,140 | — |
| Jun 18, 2026 | Brown Shellyofficer: EVP, Chief Strategy Officer | Grant | 35,861 | $40.24 |
| Jun 18, 2026 | Brown Shellyofficer: EVP, Chief Strategy Officer | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Brown Shellyofficer: EVP, Chief Strategy Officer | Grant | 37,276 | — |
| Jun 18, 2026 | Emmons Lanceofficer: EVP and CFO | Grant | 35,861 | $40.24 |
| Jun 18, 2026 | Emmons Lanceofficer: EVP and CFO | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Emmons Lanceofficer: EVP and CFO | Grant | 37,276 | — |
| Jun 18, 2026 | Schafer Douglas M. JRofficer: EVP and CIO | Grant | 21,481 | $40.24 |
| Jun 18, 2026 | Schafer Douglas M. JRofficer: EVP and CIO | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Schafer Douglas M. JRofficer: EVP and CIO | Grant | 23,298 | — |
| Jun 18, 2026 | Smollen Johnofficer: EVP, New Product Development | Grant | 7,455 | — |
| Jun 18, 2026 | Smollen Johnofficer: EVP, New Product Development | Grant | 5,184 | $40.24 |
| Jun 18, 2026 | Smollen Johnofficer: EVP, New Product Development | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Deitzel Edwardofficer: EVP, CRO, CCO MIAX Exchanges | Grant | 7,101 | $40.24 |
| Jun 18, 2026 | Deitzel Edwardofficer: EVP, CRO, CCO MIAX Exchanges | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Deitzel Edwardofficer: EVP, CRO, CCO MIAX Exchanges | Grant | 9,319 | — |
| Jun 18, 2026 | Jayabalan Harishofficer: EVP, CISO and CRO | Grant | 34,808 | $40.24 |
| Jun 18, 2026 | Jayabalan Harishofficer: EVP, CISO and CRO | Grant | 2,485 | $40.24 |
| Jun 18, 2026 | Jayabalan Harishofficer: EVP, CISO and CRO | Grant | 4,660 | — |
| Jun 18, 2026 | Vermaas Ceesofficer: CEO of TISEG | Grant | 4,793 | $40.24 |
| Jun 17, 2026 | Sommers Jill E.director | Grant | 1,113 | — |
| Jun 17, 2026 | Lozier Kenneth W.director | Grant | 2,571 | $40.24 |
| Jun 17, 2026 | Lozier Kenneth W.director | Grant | 4,970 | — |
| Jun 17, 2026 | Lozier Kenneth W.director | Grant | 2,267 | — |
Source: MIAX SEC Form 4 filings, latest Jun 18, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MIAX positions over the last 6 months (SEC Form 13F).
Increased
145
New positions
150
Reduced
49
Sold out
57
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 4.1M | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 3.6M | May 15, 2026 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | Increased | 3.5M | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 3.3M | Feb 17, 2026 |
| T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | Increased | 3.0M | Feb 19, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.8M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 2.2M | May 13, 2026 |
| VANGUARD GROUP INC | Increased | 1.9M | Jan 29, 2026 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | Increased | 1.8M | Feb 11, 2026 |
| BLACKROCK, INC. | Increased | 1.8M | Feb 12, 2026 |
| CITADEL ADVISORS LLC | Increased | 1.7M | May 15, 2026 |
| INVESCO LTD. | Increased | 1.6M | May 12, 2026 |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.4M | Feb 13, 2026 |
| ALYESKA INVESTMENT GROUP, L.P. | Increased | 1.4M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 1.4M | May 8, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.