---
schema_version: "secwatch.filing_event.v1"
accession: "0001438472-26-000008"
form_type: "8-K"
ticker: "MIAX"
cik: "0001438472"
company_name: "MIAMI INTERNATIONAL HOLDINGS, INC."
filed_at: "2026-01-21T23:59:59+00:00"
generated_at: "2026-05-16T09:16:16.775626+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# MIAX completes sale of 90% of MIAX Derivatives Exchange to Robinhood-Susquehanna JV

## Summary
- Sold 90% of MIAXdx equity to joint venture by Robinhood (HOOD) and Susquehanna International Group.
- MIAX retains 10% stake in MIAXdx, a CFTC-regulated DCM/DCO for fully collateralized futures and options.
- Transaction effective Jan 20, 2026; no purchase price or financial terms disclosed.
- CEO says sale unlocks shareholder value and allows focus on core exchange growth.

## SEC filing metadata
- accession: 0001438472-26-000008
- form_type: 8-K
- ticker: MIAX
- cik: 0001438472
- company_name: MIAMI INTERNATIONAL HOLDINGS, INC.
- filed_at: 2026-01-21T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1438472/000143847226000008/0001438472-26-000008-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1438472/000143847226000008/miax-20260120.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001438472-26-000008
- JSON: https://secwatch.observer/filing/0001438472-26-000008.json
- Plain text: https://secwatch.observer/filing/0001438472-26-000008.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.