Quick Takeaways
- HORIZON KINETICS ASSET MANAGEMENT LLC filed SCHEDULE 13D/A for MIAMI INTERNATIONAL HOLDINGS, INC. Common Stock (MIAX).
- Disclosed ownership: 12%.
- Date of event: 24 Nov 2025.
HORIZON KINETICS ASSET MANAGEMENT LLC - 24 Nov 2025 SCHEDULE 13D/A Report for MIAMI INTERNATIONAL HOLDINGS, INC. Common Stock (MIAX)
- Filing Manager
- HORIZON KINETICS ASSET MANAGEMENT LLC
- Reporting Manager
- HORIZON KINETICS ASSET MANAGEMENT LLC
- Symbol
- MIAX
- Shares outstanding
- 81,196,538 shares
- Disclosed Ownership
- 9,499,995 shares
- Ownership
- 12%
- Form type
- SCHEDULE 13D/A
- Filing time
- 26 Nov 2025, 13:35:29 UTC
- Date of event
- 24 Nov 2025
- Previous filing
- 21 Aug 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"HORIZON KINETICS ASSET MANAGEMENT LLC disclosed 12% ownership in MIAMI INTERNATIONAL HOLDINGS, INC. Common Stock (MIAX) on 24 Nov 2025."
What Changed
- Previous schedule filing date: 21 Aug 2025.
- Current filing was accepted on 26 Nov 2025, 13:35.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | 12% | 9,499,995 | 9,499,995 | 0 | /s/Jay Kesslen | Jay Kesslen, General Counsel | 0001056823 |