MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) Insider Trading

Over the last 3 months, MIAX insiders made 0 open-market buys and 30 sales, a net sale of -$33.3M (SEC Form 4). Over the last 6 months, 154 institutions increased and 46 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
30
Net (3m)
-$33.3M
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Context3-month price -5.8%Institutions accumulating (13F)
DateInsiderTypeSharesPrice
Jun 4, 2026Teekell Judson GraydirectorSell3,000$42.78
Jun 4, 2026Gallagher Thomas P.director, officer: Chairman & CEOOption70,000$12.00
Jun 4, 2026Brown Shellyofficer: EVP, Chief Strategy OfficerSell16,000$42.12
Jun 4, 2026Gallagher Thomas P.director, officer: Chairman & CEOSell70,000$42.36
Jun 4, 2026Brown Shellyofficer: EVP, Chief Strategy OfficerOption16,000$12.00
Jun 4, 2026Schafer Douglas M. JRofficer: EVP and CIOSell48,000$42.84
Jun 4, 2026Schafer Douglas M. JRofficer: EVP and CIOOption48,000$12.00
Jun 4, 2026Deitzel Edwardofficer: EVP, CRO, CCO MIAX ExchangesSell11,000$42.16
Jun 4, 2026Deitzel Edwardofficer: EVP, CRO, CCO MIAX ExchangesOption11,000$12.00
Jun 4, 2026Comly Barbara J.officer: EVP, GC & Corporate SecretarySell28,000$42.85
Jun 4, 2026Comly Barbara J.officer: EVP, GC & Corporate SecretaryOption28,000$12.00
Jun 4, 2026Eckert Kurt M.directorSell5,250$42.76
Jun 4, 2026Eckert Kurt M.directorOption5,250$12.00
May 19, 2026Teekell Judson GraydirectorTax4,991$54.51
May 19, 2026Teekell Judson GraydirectorOption22,667$12.00
May 18, 2026Emmons Lanceofficer: EVP and CFOSell35,000$56.36
May 13, 2026Gallagher Thomas P.director, officer: Chairman & CEOOption24,999$12.00
May 7, 2026Gallagher Thomas P.director, officer: Chairman & CEOSell15,771$47.92
May 7, 2026Gallagher Thomas P.director, officer: Chairman & CEOOption15,771$12.00
May 5, 2026Eckert Kurt M.directorSell5,625$47.29
May 5, 2026Eckert Kurt M.directorOption5,625$12.00
May 5, 2026Schafer Douglas M. JRofficer: EVP and CIOSell48,000$47.25
May 5, 2026Schafer Douglas M. JRofficer: EVP and CIOOption48,000$12.00
May 5, 2026Teekell Judson GraydirectorSell3,000$47.30
May 5, 2026Brown Shellyofficer: EVP, Chief Strategy OfficerSell16,000$47.28
May 5, 2026Brown Shellyofficer: EVP, Chief Strategy OfficerOption16,000$12.00
May 5, 2026Deitzel Edwardofficer: EVP, CRO, CCO MIAX ExchangesSell11,000$47.28
May 5, 2026Deitzel Edwardofficer: EVP, CRO, CCO MIAX ExchangesOption11,000$12.00
May 5, 2026Gallagher Thomas P.director, officer: Chairman & CEOOption54,229$12.00
May 5, 2026Gallagher Thomas P.director, officer: Chairman & CEOSell54,229$47.26

Source: MIAX SEC Form 4 filings, latest Jun 4, 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
154
New positions
144
Reduced
46
Sold out
55
Largest moves
InstitutionActionSharesFiled
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.Increased4.1MMay 15, 2026
HORIZON KINETICS ASSET MANAGEMENT LLCIncreased3.5MMay 15, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLPIncreased3.3MMay 15, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLPIncreased3.3MFeb 17, 2026
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.Increased3.0MFeb 19, 2026
BLACKROCK, INC.Increased2.2MMay 13, 2026
VANGUARD GROUP INCIncreased1.9MJan 29, 2026
HORIZON KINETICS ASSET MANAGEMENT LLCIncreased1.8MFeb 11, 2026
BLACKROCK, INC.Increased1.8MFeb 12, 2026
CITADEL ADVISORS LLCIncreased1.6MMay 15, 2026
INVESCO LTD.Increased1.6MMay 12, 2026
AMERICAN CENTURY COMPANIES INCIncreased1.4MFeb 13, 2026
ALYESKA INVESTMENT GROUP, L.P.Increased1.4MMay 15, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position1.4MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position1.4MMay 8, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.

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