Transactions
34
Insider / MIAMI INTERNATIONAL HOLDINGS, INC.
Schafer Douglas M. JR
EVP and CIO at MIAMI INTERNATIONAL HOLDINGS, INC.
- Ticker
- MIAX
- First filing on record
- February 12, 2026
- Latest trade on record
- October 22, 2026
- SEC filings
- EDGAR ↗
Schafer Douglas M. JR, EVP and CIO at MIAMI INTERNATIONAL HOLDINGS, INC., has disclosed 34 transactions in MIAX since February 12, 2026: 0 purchases (0 open-market buys) and 11 sales, worth about $25.1M at the reported prices. The latest was filed October 26, 2026, 4 days after the trade; 5 filings were late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
11
Avg. disclosure lag
2.6d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Schafer Douglas M. JR made no purchases and 11 sales worth $21M, plus 23 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Schafer Douglas M. JR has traded 1 stock on record; the largest by dollars is MIAX.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
1 of 12 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 20 | 672,000 | $4.0M |
| S | Open-market sale | 8 | 336,000 | $14.0M |
| A | Grant or award | 3 | 47,264 | — |
| F | Shares withheld for tax | 3 | 173,680 | $7.1M |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 34 | 0 | 11 · $21.1M |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| MIAX | Option / conversion M | October 22, 2026 | October 26, 2026 | 4d | 8,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | October 22, 2026 | October 26, 2026 | 4d | 8,000 | $35 | $280K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | October 22, 2026 | October 26, 2026 | 4d | 8,000 | $12 | $96K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | October 2, 2026 | October 6, 2026 | 4d | 40,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | October 2, 2026 | October 6, 2026 | 4d | 40,000 | $33 | $1.3M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | October 2, 2026 | October 6, 2026 | 4d | 40,000 | $12 | $480K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | September 2, 2026 | September 4, 2026 | 2d | 4,666 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Option / conversion M | September 2, 2026 | September 4, 2026 | 2d | 43,334 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | September 2, 2026 | September 4, 2026 | 2d | 48,000 | $40 | $1.9M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | September 2, 2026 | September 4, 2026 | 2d | 4,666 | $12 | $56K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | September 2, 2026 | September 4, 2026 | 2d | 43,334 | $12 | $520K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | August 4, 2026 | August 6, 2026 | 2d | 48,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | August 4, 2026 | August 6, 2026 | 2d | 48,000 | $46 | $2.2M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | August 4, 2026 | August 6, 2026 | 2d | 48,000 | $12 | $576K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | July 2, 2026 | July 7, 2026 | 5d | 42,000 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Option / conversion M | July 2, 2026 | July 7, 2026 | 5d | 6,000 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | July 2, 2026 | July 7, 2026 | 5d | 48,000 | $41 | $2.0M | late10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | July 2, 2026 | July 7, 2026 | 5d | 42,000 | $12 | $504K | late10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | July 2, 2026 | July 7, 2026 | 5d | 6,000 | $12 | $72K | late10b5-1 plan | Form 4 ↗ | |
| MIAX | Other A | June 16, 2026 | June 18, 2026 | 2d | 21,481 | — | — | derivative | Form 4 ↗ | |
| MIAX | Other A | June 16, 2026 | June 18, 2026 | 2d | 2,485 | — | — | derivative | Form 4 ↗ | |
| MIAX | Other A | June 16, 2026 | June 18, 2026 | 2d | 23,298 | — | — | Form 4 ↗ | ||
| MIAX | Sell F | June 11, 2026 | June 12, 2026 | 1d | 32,565 | $41 | $1.3M | Form 4 ↗ | ||
| MIAX | Option / conversion M | June 2, 2026 | June 4, 2026 | 2d | 48,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | June 2, 2026 | June 4, 2026 | 2d | 48,000 | $43 | $2.1M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | June 2, 2026 | June 4, 2026 | 2d | 48,000 | $12 | $576K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | May 4, 2026 | May 5, 2026 | 1d | 48,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | May 4, 2026 | May 5, 2026 | 1d | 48,000 | $47 | $2.3M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | May 4, 2026 | May 5, 2026 | 1d | 48,000 | $12 | $576K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | March 17, 2026 | March 18, 2026 | 1d | 48,000 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| MIAX | Sell S | March 17, 2026 | March 18, 2026 | 1d | 48,000 | $40 | $1.9M | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Option / conversion M | March 17, 2026 | March 18, 2026 | 1d | 48,000 | $12 | $576K | 10b5-1 plan | Form 4 ↗ | |
| MIAX | Sell F | February 18, 2026 | February 20, 2026 | 2d | 32,565 | $41 | $1.3M | Form 4 ↗ | ||
| MIAX | Sell F | February 10, 2026 | February 12, 2026 | 2d | 108,550 | $41 | $4.5M | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| October 26, 2026 | Form 4 | 0002079445-26-000019 | 3 | published | EDGAR ↗ |
| October 6, 2026 | Form 4 | 0001628280-26-065268 | 3 | published | EDGAR ↗ |
| September 4, 2026 | Form 4 | 0002079445-26-000017 | 5 | published | EDGAR ↗ |
| August 6, 2026 | Form 4 | 0002079445-26-000015 | 3 | published | EDGAR ↗ |
| July 7, 2026 | Form 4 | 0001628280-26-047484 | 5 | published | EDGAR ↗ |
| June 18, 2026 | Form 4 | 0002079445-26-000013 | 3 | published | EDGAR ↗ |
| June 12, 2026 | Form 4 | 0002079445-26-000011 | 1 | published | EDGAR ↗ |
| June 4, 2026 | Form 4 | 0002079445-26-000009 | 3 | published | EDGAR ↗ |
| May 5, 2026 | Form 4 | 0002079445-26-000007 | 3 | published | EDGAR ↗ |
| March 18, 2026 | Form 4 | 0001628280-26-019437 | 3 | published | EDGAR ↗ |
| February 20, 2026 | Form 4 | 0002079445-26-000005 | 1 | published | EDGAR ↗ |
| February 12, 2026 | Form 4 | 0002079445-26-000003 | 1 | published | EDGAR ↗ |
Other insiders at MIAMI INTERNATIONAL HOLDINGS, INC.
- Gallagher Thomas P. Chairman & CEO 47 rows
- Brown Shelly EVP, Chief Strategy Officer 40 rows
- Comly Barbara J. EVP, GC & Corporate Secretary 35 rows
- Deitzel Edward EVP, CRO, CCO MIAX Exchanges 32 rows
- Jayabalan Harish EVP, CISO and CRO 23 rows
- Eckert Kurt M. Director 18 rows
- STAHL MURRAY Director 13 rows
- Teekell Judson Gray Director 13 rows
- Emmons Lance EVP and CFO 12 rows
- Schwarzkopf Cynthia Director 12 rows
Everyone on file, with contracts and lobbying under the company's name: MIAMI INTERNATIONAL HOLDINGS, INC..
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Rule 10b5-1 trading plans The plan must be set up when the insider has no important non-public information.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 12 | 34 | February 12, 2026 | October 26, 2026 | Form 4 list on EDGAR |
Site built October 27, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.