Notice of Proposed Sale · 144
Miami International Holdings, Inc.
MIAXNYSEEQUITYCurrent
Notice of Proposed Sale
Structured filing — 144
primary_doc.xml
Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.
Proposed-sale notice
- Issuer
- Miami International Holdings, Inc.
- Issuer CIK
- 0001438472
- SEC file number
- 001-42805
- Phone
- 6098977300
- Person for whose account securities are to be sold
- DOUGLAS M. SCHAFER JR.
- Relationships to issuer
- Officer
- Street
- 7 Roszel Road, Suite 1A
- City
- Princeton
- State / country code
- NJ
- Postal code
- 08540
Securities proposed for sale
| Security | Proposed units | Aggregate market value | Units outstanding | Approximate sale date | Exchange | Broker / market maker |
|---|---|---|---|---|---|---|
| Common | 120,000 | 4,050,000.00 | 99,230,898 | 10/02/2026 | NYSE | Morgan Stanley Smith Barney LLC Executive Financial Services |
Broker / market maker — proposed row 1, entry 1
- Name
- Morgan Stanley Smith Barney LLC Executive Financial Services
- Street
- 1 New York Plaza
- Street (continued)
- 8th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10004
Acquisition of securities to be sold
| Security | Acquired | Nature of acquisition | Acquired from | Amount acquired | Gift transaction | Payment date | Nature of payment |
|---|---|---|---|---|---|---|---|
| Common | 10/02/2026 | Exercise of Stock Options | Issuer | 120,000 | N | 10/02/2026 | Cash |
Sales reported in the preceding three months
| Seller | Security | Sale date | Amount sold | Gross proceeds |
|---|---|---|---|---|
| 10b5-1 Sales for DOUGLAS M. SCHAFER JR. | Common | 09/02/2026 | 48,000 | 1,943,198.94 |
| 10b5-1 Sales for DOUGLAS M. SCHAFER JR. | Common | 08/04/2026 | 48,000 | 2,193,886.40 |
Seller — prior-sale row 1, entry 1
- Name
- 10b5-1 Sales for DOUGLAS M. SCHAFER JR.
- Street
- 7 Roszel Road, Suite 1A
- City
- Princeton
- State / country code
- NJ
- Postal code
- 08540
Seller — prior-sale row 2, entry 1
- Name
- 10b5-1 Sales for DOUGLAS M. SCHAFER JR.
- Street
- 7 Roszel Road, Suite 1A
- City
- Princeton
- State / country code
- NJ
- Postal code
- 08540
Prior-sale reporting
- Nothing to report for the preceding three months
- N
Remarks
The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Notice signature
- Notice date
- 10/02/2026
- Signed
- /s/ Douglas M. Schafer, Jr.
- Plan adoption dates
- 12/16/2025
Company context
We are a technology-driven leader in building and operating regulated financial marketplaces across multiple asset classes and geographies. Our MIAX Exchanges, MIAX Futures and BSX marketplaces are enabled by our in-house built, proprietary technology. We believe the speed and performance of our proprietary technology coupled with our fully integrated, award-winning customer service, sets us apart from our competitors.