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WAVEMAN · COMPANY
MIAX · Miami International Holdings, Inc.
> Ask across nine datasets ⌘K
LIVE
TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475
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MIAX

MIAMI INTERNATIONAL HOLDINGS, INC.
FINANCIAL SERVICES · SECURITY BROKERS, DEALERS & FLOTATION COMPANIES · CIK 0001438472
CONGRESS · 1FORM 144 · 13☆ WATCH
INSIDER NET · 180D
-$72.4M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
1
FUNDS ADDED · QTR
0
13F, latest reported quarter
REVENUE GROWTH
+19.6%
XBRL, annual
NET MARGIN
-5.1%
CONVERSIONS · 180D
68
codes C/M, not in net · $16.7M priced
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$72.4M over 180 days
-$37.0M over 90 days
below 96% of Financial Services
CONGRESS
1 member bought in the last year
the lowest in Financial Services
FUNDS
fewer than five institutions report holding it
REVENUE
+19.6% year over year
more than 62% of Financial Services
MARGIN
-5.1% net margin
below 59% of Financial Services
BUYBACKS
$17.0M repurchased, FY to 2026-06-30
below 62% of Financial Services
SHORT
6.3% of shares outstanding short · 5.4 days to cover · settled 2026-07-31
more than 82% of Financial Services
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$72.4M across 10 people in 180 days.
1 member of Congress reported buying it this year.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN +16.7%
+16.7%12M
-4%+16%+36%+56%2025-092025-102025-122026-032026-052026-072026-09 2026-08-19 · Gallagher Thomas P. sold $6.2M2026-03-02 · HORIZON KINETICS ASSET MANAGEMENT LLC sold $5.0M2026-04-15 · Gallagher Thomas P. sold $4.5M2026-04-15 · Gallagher Thomas P. sold $3.0M2026-07-13 · Gallagher Thomas P. sold $3.0M2026-06-02 · Gallagher Thomas P. sold $3.0M2026-05-04 · Gallagher Thomas P. sold $2.6M2026-05-04 · Schafer Douglas M. JR sold $2.3M2026-08-04 · Gallagher Thomas P. sold $2.2M2026-08-04 · Schafer Douglas M. JR sold $2.2M2026-03-02 · STAHL MURRAY sold $2.2M2026-04-15 · Gallagher Thomas P. sold $2.2M2026-06-02 · Schafer Douglas M. JR sold $2.1M2026-08-04 · Comly Barbara J. sold $2.0M2026-09-03 · Gallagher Thomas P. sold $2.0M2026-07-02 · Schafer Douglas M. JR sold $2.0M2026-05-15 · Emmons Lance sold $2.0M2026-09-02 · Schafer Douglas M. JR sold $1.9M2026-03-17 · Schafer Douglas M. JR sold $1.9M2026-09-02 · Comly Barbara J. sold $1.8M2026-07-06 · Gallagher Thomas P. sold $1.8M2026-08-17 · Emmons Lance sold $1.5M2026-03-19 · Eckert Kurt M. sold $1.5M2026-05-04 · Comly Barbara J. sold $1.3M2026-04-15 · Comly Barbara J. sold $1.3M2026-06-02 · Comly Barbara J. sold $1.2M2026-07-07 · Gallagher Thomas P. sold $1.2M2026-07-13 · Comly Barbara J. sold $1.2M2026-07-02 · Comly Barbara J. sold $1.2M2026-03-23 · Brown Shelly sold $1.0M2026-08-04 · Jayabalan Harish sold $918.0K2026-07-06 · Jayabalan Harish sold $842.4K2026-06-11 · Schwarzkopf Cynthia sold $813.7K2026-05-04 · Brown Shelly sold $756.5K2026-05-05 · Gallagher Thomas P. sold $755.7K2026-04-08 · Brown Shelly sold $691.5K2026-07-06 · Brown Shelly sold $674.1K2026-06-02 · Brown Shelly sold $673.9K2026-05-04 · Deitzel Edward sold $520.1K2026-08-04 · Deitzel Edward sold $503.6K2026-09-03 · Deitzel Edward sold $464.3K2026-06-02 · Deitzel Edward sold $463.8K2026-09-03 · GALLAGHER INVESTMENTS LLC filed to sell $5.7M2026-08-19 · GALLAGHER INVESTMENTS LLC filed to sell $6.3M2026-08-17 · Lance Emmons filed to sell $1.5M2026-08-04 · BARBARA J. COMLY filed to sell $8.5M2026-08-04 · EDWARD DEITZEL filed to sell $2.1M2026-08-04 · GALLAGHER INVESTMENTS LLC filed to sell $2.3M2026-08-04 · HARISH JAYABALAN filed to sell $3.0M2026-08-04 · J. GRAY TEEKELL filed to sell $281.0K2026-07-15 · CYNTHIA SCHWARZKOPF filed to sell $619.5K2026-07-06 · SHELLY BROWN filed to sell $653.4K2026-07-06 · HARISH JAYABALAN filed to sell $816.8K2026-07-02 · KURT M. ECKERT filed to sell $246.5K2026-07-02 · DOUGLAS M. SCHAFER JR. filed to sell $5.6M
INSIDER SELLFORM 144
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $72.4M sold by insiders over 180 days, 1 Congress member(s) bought in 12 months, $37.5M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
MSTRCOINMORNUPSTIBKRCACCARESHOODRKTSCHWDAVEGS
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, MIAMI INTERNATIONAL HOLDINGS, INC. insiders sold a net $72.4M of stock across 87 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-06.

INSIDER
FILED
SHARES
VALUE
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
SELL
2026-09-03
11,000.0
$464.3K
Gallagher Thomas P.
Chairman & CEO
SELL
2026-09-03
47,000.0
$2.0M
Teekell Judson Gray
Director
SELL
2026-09-02
5,545.0
$230.6K
Teekell Judson Gray
Director
SELL
2026-09-02
3,000.0
$122.7K
Schafer Douglas M. JR
EVP and CIO
SELL
2026-09-02
48,000.0
$1.9M
87 TRANSACTIONS ON RECORD

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Institutional holders
13F · holdings as of the latest quarter funds have reported

no 13F holders found for this ticker

SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
GALLAGHER INVESTMENTS LLC
FILED 2026-09-03
$5.7M
GALLAGHER INVESTMENTS LLC
FILED 2026-08-19
$6.3M
Lance Emmons
FILED 2026-08-17
$1.5M
BARBARA J. COMLY
FILED 2026-08-04
$8.5M
EDWARD DEITZEL
FILED 2026-08-04
$2.1M
Executive pay vs shareholder return · Thomas P. Gallagher
DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself
FY
CEO TOTAL
ACTUALLY PAID
OTHER NEOs AVG
TSR
PEER TSR
2025
$21.2M
$35.1M
$4.9M
+44%
-3%
TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
2025-122024-122023-12
REVENUE$1.4B$1.1B$1.0B
GROSS PROFIT$430.5M$275.6M$232.5M
OPERATING INCOME$92.0M$-2.8M$-2.9M
NET INCOME$-70.0M$102.1M$-20.9M
EPS (DILUTED)-1.001.39-0.37
OPERATING CASH FLOW$167.8M$111.4M$-49.2M
CASH$433.6M$150.3M$59.3M
LONG-TERM DEBT$0$32.3M—
BUYBACKS$21.8M$12.4M$3.3M
SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-06 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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© 2026 WAVEMAN · SOURCE: SEC EDGAR & OFFICIAL GOVERNMENT DATA · NOT INVESTMENT ADVICE · CHART BY TRADINGVIEW · UPDATED 2026-09-06 ALL SYSTEMS LIVE FOR MACHINES →