Insider · CIK 2079445
Douglas M. Schafer JR
EVP and CIO at Miami International Holdings MIAX
Full history from EDGAR: holdings now, every transaction and Form 144 planned sales
Open-market buys0
Open-market sales10
Bought$0
Sold$15.6M
Every trade, with what the company filed around it
Open-market buys and sales as each Form 4 states them, newest first.
How these figures work
Notes on each row are as each Form 4 states them, next to SEC Tracker's own records of the company's filings and other insiders' buys. Holding after is what the filing reports they held after the trade, with the change in their holding.
| Date | Company | Trade | Value | Holding after | Notes |
|---|---|---|---|---|---|
| Nov 4, 2026 | Miami International Holdings MIAX | Option exercise 8,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Nov 4, 2026. | $96K | 395,414 | The same day as a Form 144 notice of a planned insider sale filed Nov 4, 2026. |
| Nov 4, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 8,000 sh at $35.00 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Nov 4, 2026. | $280K | 387,414 −2% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Nov 4, 2026. |
| Nov 3, 2026 | Miami International Holdings MIAX | Option exercise 40,000 sh at $12.00 1 day after the company's 10-Q filed Nov 2, 2026. | $480K | 427,414 | 1 day after the company's 10-Q filed Nov 2, 2026. |
| Nov 3, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 40,000 sh at $34.07 The filing says this sale was under a Rule 10b5-1 plan set up in advance. 1 day after the company's 10-Q filed Nov 2, 2026. | $1.4M | 387,414 −9% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. 1 day after the company's 10-Q filed Nov 2, 2026. |
| Oct 22, 2026 | Miami International Holdings MIAX | Option exercise 8,000 sh at $12.00 20 days after a Form 144 notice of a planned insider sale filed Oct 2, 2026. | $96K | 395,414 | 20 days after a Form 144 notice of a planned insider sale filed Oct 2, 2026. |
| Oct 22, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 8,000 sh at $35.06 The filing says this sale was under a Rule 10b5-1 plan set up in advance. 20 days after a Form 144 notice of a planned insider sale filed Oct 2, 2026. | $280K | 387,414 −2% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. 20 days after a Form 144 notice of a planned insider sale filed Oct 2, 2026. |
| Oct 2, 2026 | Miami International Holdings MIAX | Option exercise 40,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Oct 2, 2026. | $480K | 427,414 | The same day as a Form 144 notice of a planned insider sale filed Oct 2, 2026. |
| Oct 2, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 40,000 sh at $33.34 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Oct 2, 2026. | $1.3M | 387,414 −9% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Oct 2, 2026. |
| Sep 2, 2026 | Miami International Holdings MIAX | Option exercise 43,334 sh at $12.00 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. | $520K | 430,748 | 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. |
| Sep 2, 2026 | Miami International Holdings MIAX | Option exercise 4,666 sh at $12.00 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. | $56K | 435,414 | 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. |
| Sep 2, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $40.48 The filing says this sale was under a Rule 10b5-1 plan set up in advance. 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. | $1.9M | 387,414 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. 14 days after a Form 144 notice of a planned insider sale filed Aug 19, 2026. |
| Aug 4, 2026 | Miami International Holdings MIAX | Option exercise 48,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Aug 4, 2026. | $576K | 435,414 | The same day as a Form 144 notice of a planned insider sale filed Aug 4, 2026. |
| Aug 4, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $45.71 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Aug 4, 2026. | $2.2M | 387,414 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Aug 4, 2026. |
| Jul 2, 2026 | Miami International Holdings MIAX | Option exercise 6,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. | $72K | 393,414 | The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. |
| Jul 2, 2026 | Miami International Holdings MIAX | Option exercise 42,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. | $504K | 435,414 | The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. |
| Jul 2, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $41.22 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. | $2M | 387,414 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Jul 2, 2026. |
| Jun 16, 2026 | Miami International Holdings MIAX | Award 23,298 sh 1 day after a Form 144 notice of a planned insider sale filed Jun 15, 2026. | 387,414 | 1 day after a Form 144 notice of a planned insider sale filed Jun 15, 2026. | |
| Jun 11, 2026 | Miami International Holdings MIAX | Tax withholding 32,565 sh at $40.79 The same day as a Form 144 notice of a planned insider sale filed Jun 11, 2026. | $1.3M | 364,116 | The same day as a Form 144 notice of a planned insider sale filed Jun 11, 2026. |
| Jun 2, 2026 | Miami International Holdings MIAX | Option exercise 48,000 sh at $12.00 12 days after the company's SCHEDULE 13D/A filed May 21, 2026. | $576K | 444,681 | 12 days after the company's SCHEDULE 13D/A filed May 21, 2026. |
| Jun 2, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $42.84 The filing says this sale was under a Rule 10b5-1 plan set up in advance. 12 days after the company's SCHEDULE 13D/A filed May 21, 2026. | $2.1M | 396,681 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. 12 days after the company's SCHEDULE 13D/A filed May 21, 2026. |
| May 4, 2026 | Miami International Holdings MIAX | Option exercise 48,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed May 4, 2026. | $576K | 444,681 | The same day as a Form 144 notice of a planned insider sale filed May 4, 2026. |
| May 4, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $47.25 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed May 4, 2026. | $2.3M | 396,681 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed May 4, 2026. |
| Mar 17, 2026 | Miami International Holdings MIAX | Option exercise 48,000 sh at $12.00 The same day as a Form 144 notice of a planned insider sale filed Mar 17, 2026. | $576K | 444,681 | The same day as a Form 144 notice of a planned insider sale filed Mar 17, 2026. |
| Mar 17, 2026 | Miami International Holdings MIAX | Sold (10b5-1) 48,000 sh at $39.74 The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Mar 17, 2026. | $1.9M | 396,681 −11% | The filing says this sale was under a Rule 10b5-1 plan set up in advance. The same day as a Form 144 notice of a planned insider sale filed Mar 17, 2026. |
| Feb 18, 2026 | Miami International Holdings MIAX | Tax withholding 32,565 sh at $40.89 6 days after the company's 8-K filed Feb 12, 2026. | $1.3M | 396,681 | 6 days after the company's 8-K filed Feb 12, 2026. |
| Feb 10, 2026 | Miami International Holdings MIAX | Tax withholding 108,550 sh at $41.33 20 days after the company's 8-K filed Jan 21, 2026. | $4.5M | 429,246 | 20 days after the company's 8-K filed Jan 21, 2026. |
| Aug 15, 2025 | Miami International Holdings MIAX | Conversion 500 sh | 537,796 | ||
| Aug 15, 2025 | Miami International Holdings MIAX | Conversion 387,296 sh | 537,796 |
Open-market trades are Form 4 transaction codes P (purchase) and S (sale). Planned sales are those the filing marks as made under a Rule 10b5-1 plan. A P-code buy at the offering price within a day of the company's FWP, 424B prospectus or offering 8-K is marked Bought in the offering and left out of open-market buy counts and cluster buys. Prices and values are as stated in each Form 4. Stock prices aren't shown on this page. Not investment advice.
Data on this page was fetched . The filing on SEC.gov is the record.