MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)
Data as of , from SEC Form 4 filings.
Net insider selling (90d)Watch MIAX
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About MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)
MIAMI INTERNATIONAL HOLDINGS, INC. files with the SEC under CIK 0001438472 and is classified as security brokers, dealers and flotation companies. It is grouped with Financials companies on this site. It filed a registration statement with the SEC on 9 December 2025 and has not yet priced an offering.
MIAX Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 18 | 585,749 | $24.62M |
| Option exercise | 38 | 838,446 | |
| Tax withholding / forfeiture | 3 | 210,003 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
MIAX insider transactions (Form 4)
96144 Form 4 filings on record, the earliest from Aug 13, 2025, newest first. Filing history page 3 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Paul Stahlin - Director | Option exercise | Stock Option (Right to Buy) | 7,000 | $0.00 | - | |
| Paul Stahlin - Director | Option exercise | Stock Option (Right to Buy) | 4,000 | $0.00 | - | |
| Paul Stahlin - Director | Option exercise | Common Stock | 7,000 | $12.00 | $84K | |
| Paul Stahlin - Director | Option exercise | Common Stock | 4,000 | $12.00 | $48K | |
| Paul Stahlin - Director | Tax withholding / forfeiture | Common Stock | 1,177 | $40.79 | $48K | |
 Harish Jayabalan - Officer | Option exercise | Common Stock | 10,217 | $12.00 | $123K | |
| Harish Jayabalan - Officer | Open-market sale | Common Stock | 10,217 | $40.12 footnote F2 | $410K | |
| Harish Jayabalan - Officer | Option exercise | Common Stock | 9,783 | $12.00 | $117K | |
| Harish Jayabalan - Officer | Open-market sale | Common Stock | 9,783 | $40.04 footnote F3 | $392K | |
| Harish Jayabalan - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 10,217 | $0.00 | - | |
| Harish Jayabalan - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 9,783 | $0.00 | - | |
| ||||||
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 3,000 | $42.78 footnote F2 | $128K | |
| ||||||
| Kurt M. Eckert - Director | Option exercise | Common Stock | 5,250 | $12.00 | $63K | |
| Kurt M. Eckert - Director | Open-market sale | Common Stock | 5,250 | $42.76 footnote F2 | $224K | |
| Kurt M. Eckert - Director | Option exercise | Stock Option (Right to Buy) | 5,250 | $0.00 | - | |
| ||||||
| Barbara J. Comly - Officer | Option exercise | Common Stock | 28,000 | $12.00 | $336K | |
| Barbara J. Comly - Officer | Open-market sale | Common Stock | 28,000 | $42.85 footnote F2 | $1.20M | |
| Barbara J. Comly - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 28,000 | $0.00 | - | |
| ||||||
| Edward Deitzel - Officer | Option exercise | Common Stock | 11,000 | $12.00 | $132K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 11,000 | $42.16 footnote F2 | $464K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 11,000 | $0.00 | - | |
| ||||||
| Douglas M. Schafer Jr. - Officer | Option exercise | Common Stock | 48,000 | $12.00 | $576K | |
| Douglas M. Schafer Jr. - Officer | Open-market sale | Common Stock | 48,000 | $42.84 footnote F2 | $2.06M | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 48,000 | $0.00 | - | |
| ||||||
| Shelly Brown - Officer | Option exercise | Common Stock | 16,000 | $12.00 | $192K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 16,000 | $42.12 footnote F2 | $674K | |
| Shelly Brown - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 16,000 | $0.00 | - | |
| ||||||
 Thomas P. Gallagher - Officer | Option exercise | Common Stock | 70,000 | $12.00 | $840K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 70,000 | $42.36 footnote F3 | $2.97M | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 70,000 | $0.00 | - | |
| ||||||
| HORIZON KINETICS ASSET MANAGEMENT LLC - 10% Owner | Other | Common Stock | 2,455,744 | $0.00 | - | |
| Judson Gray Teekell - Director | Option exercise | Common Stock | 22,667 | $12.00 | $272K | |
| Judson Gray Teekell - Director | Tax withholding / forfeiture | Common Stock | 4,991 footnote F1 | $54.51 | $272K | |
| Judson Gray Teekell - Director | Option exercise | Stock Option (Right to Buy) | 22,667 | $0.00 | - | |
| ||||||
| Lance Emmons - Officer | Open-market sale | Common Stock | 35,000 | $56.36 footnote F2 | $1.97M | |
| ||||||
| Thomas P. Gallagher - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 24,999 | $0.00 | - | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 24,999 | $12.00 | $300K | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 15,771 | $12.00 | $189K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 15,771 | $47.92 footnote F3 | $756K | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 15,771 | $0.00 | - | |
| ||||||
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 54,229 | $12.00 | $651K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 54,229 | $47.26 | $2.56M | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 54,229 | $0.00 | - | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 11,000 | $12.00 | $132K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 11,000 | $47.28 footnote F2 | $520K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 11,000 | $0.00 | - | |
| ||||||
| Shelly Brown - Officer | Option exercise | Common Stock | 16,000 | $12.00 | $192K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 16,000 | $47.28 footnote F2 | $756K | |
| Shelly Brown - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 16,000 | $0.00 | - | |
| ||||||
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 3,000 | $47.30 footnote F2 | $142K | |
| ||||||
| Douglas M. Schafer Jr. - Officer | Option exercise | Common Stock | 48,000 | $12.00 | $576K | |
| Douglas M. Schafer Jr. - Officer | Open-market sale | Common Stock | 48,000 | $47.25 footnote F2 | $2.27M | |
| Douglas M. Schafer Jr. - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 48,000 | $0.00 | - | |
| ||||||
| Kurt M. Eckert - Director | Option exercise | Common Stock | 5,625 | $12.00 | $68K | |
| Kurt M. Eckert - Director | Open-market sale | Common Stock | 5,625 | $47.29 footnote F2 | $266K | |
| Kurt M. Eckert - Director | Option exercise | Stock Option (Right to Buy) | 5,625 | $0.00 | - | |
| ||||||
| Barbara J. Comly - Officer | Option exercise | Common Stock | 28,000 | $12.00 | $336K | |
| Barbara J. Comly - Officer | Open-market sale | Common Stock | 28,000 | $47.26 | $1.32M | |
| Barbara J. Comly - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 28,000 | $0.00 | - | |
| Thomas P. Gallagher - Officer | Option exercise | Common Stock | 70,001 | $12.00 | $840K | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 70,001 | $43.36 footnote F3 | $3.04M | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 104,124 | $43.36 footnote F3 | $4.51M | |
| Thomas P. Gallagher - Officer | Open-market sale | Common Stock | 49,900 | $43.68 footnote F3 | $2.18M | |
| Thomas P. Gallagher - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 70,001 | $0.00 | - | |
| ||||||
| Barbara J. Comly - Officer | Option exercise | Common Stock | 29,667 | $12.00 | $356K | |
| Barbara J. Comly - Officer | Open-market sale | Common Stock | 29,667 | $43.64 footnote F2 | $1.29M | |
| Barbara J. Comly - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 29,667 | $0.00 | - | |
| ||||||
 John Beckelman - Director | Option exercise | Common Stock | 8,667 | $12.00 | $104K | |
| John Beckelman - Director | Option exercise | Stock Option (Right to Buy) | 8,667 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Common Stock | 16,434 | $12.00 | $197K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 16,434 | $42.08 footnote F2 | $692K | |
| Shelly Brown - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 16,434 | $0.00 | - | |
| ||||||
| Edward Deitzel - Officer | Option exercise | Common Stock | 762 | $12.00 | $9K | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 4,001 | $12.00 | $48K | |
| Edward Deitzel - Officer | Option exercise | Common Stock | 7,572 | $12.00 | $91K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 7,572 | $42.02 footnote F2 | $318K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 762 | $0.00 | - | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 4,001 | $0.00 | - | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 762 | $42.00 | $32K | |
| Edward Deitzel - Officer | Open-market sale | Common Stock | 4,001 | $42.00 | $168K | |
| Edward Deitzel - Officer | Option exercise | Nonqualified Stock Option (Right to Buy) | 7,572 | $0.00 | - | |
| ||||||
| Shelly Brown - Officer | Open-market sale | Common Stock | 2,357 | $41.33 footnote F2 | $97K | |
| Shelly Brown - Officer | Open-market sale | Common Stock | 900 | $42.00 | $38K | |
| ||||||
| Judson Gray Teekell - Director | Open-market sale | Common Stock | 2,700 | $40.00 | $108K | |
| John Smollen - Officer | Tax withholding / forfeiture | Common Stock | 362 footnote F1 | $37.50 | $14K | |
| ||||||
| Shelly Brown - Officer | Option exercise | Common Stock | 8,333 | $12.00 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 6,570 | $15.22 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 6,195 | $16.14 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 3,878 | $25.78 | $100K | |
| Shelly Brown - Officer | Option exercise | Common Stock | 5,040 | $19.84 | $100K | |
| Shelly Brown - Officer | Tax withholding / forfeiture | Common Stock | 1,809 footnote F1 | $37.50 | $68K | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 8,333 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 6,570 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 6,195 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 3,878 | $0.00 | - | |
| Shelly Brown - Officer | Option exercise | Incentive Stock Option (Right to Buy) | 5,040 | $0.00 | - | |
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See every MIAX filing on record
These pages show the latest 90 of 144 Form 4 filings on record. The 7-day demo shows all 144, and sign-up brings you back to this table.
Item 2.02, 9.01
Item 8.01
Item 3.02
Item 5.07
Recent MIAX Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| DOUGLAS M. SCHAFER JR. | Officer | 120,000 | $4.05M | View on EDGAR | |
| SHELLY BROWN | Officer | 21,217 |
Stock trades in MIAX disclosed by members of the U.S. House in the last 12 months, newest first. Values are the ranges as filed.
| Member | Type | Traded | Disclosed | Value range | Owner | Days to disclose | Filing |
|---|---|---|---|---|---|---|---|
 Gilbert Ray Cisneros, Jr.Democrat, CA-31 | Purchase |
MIAX insider trading FAQ
What is the latest insider trade for MIAX?
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) had 20 insider filings in the last 90 days, with the most recent on 2026-10-06. The full record for MIAX runs to 144 Form 4 filings, the earliest from 2025-08-13. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MIAX stock?
No insider purchases of MIAX were filed in the last 90 days. 17 purchases are on record for this company.
How many insiders are selling MIAX stock?
18 insider sales of MIAX were filed in the last 90 days, totaling $24.62M.
Where can I see MIAX SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MIAX Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Financials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Douglas M. Schafer Jr. view on EDGAR
- - Harish Jayabalan view on EDGAR
- - Shelly Brown view on EDGAR
- - Shelly Brown view on EDGAR
- - Thomas P. Gallagher view on EDGAR
- - Barbara J. Comly view on EDGAR
- - Edward Deitzel view on EDGAR
- - Douglas M. Schafer Jr. view on EDGAR
- - Judson Gray Teekell view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Financials
- Where MIAX's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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