---
schema_version: "secwatch.filing_event.v1"
accession: "0001438472-26-000017"
form_type: "8-K"
ticker: "MIAX"
cik: "0001438472"
company_name: "MIAMI INTERNATIONAL HOLDINGS, INC."
filed_at: "2026-02-25T23:59:59+00:00"
generated_at: "2026-05-16T00:13:28.733781+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# MIAX Q4 net revenue $124.5M (+52% YoY), adjusted EBITDA $62.2M (+112%); sets FY2026 guidance

## Summary
- Q4 GAAP diluted EPS $0.27; adjusted diluted EPS $0.52.
- FY2025 net revenue $430.5M (+56% YoY); GAAP diluted EPS ($1.00), adjusted diluted EPS $1.82.
- Options exchanges record average daily volume 11.1M contracts (+46.5% YoY); market share 18.2%.
- Completed sale of 90% of MIAXdx to Robinhood/Susquehanna JV in Jan 2026; retained 10%.
- FY2026 adjusted opex guidance $265M-275M; capex $40M-45M; D&A $33M-38M.

## SEC filing metadata
- accession: 0001438472-26-000017
- form_type: 8-K
- ticker: MIAX
- cik: 0001438472
- company_name: MIAMI INTERNATIONAL HOLDINGS, INC.
- filed_at: 2026-02-25T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1438472/000143847226000017/0001438472-26-000017-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1438472/000143847226000017/miax-20260225.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001438472-26-000017
- JSON: https://secwatch.observer/filing/0001438472-26-000017.json
- Plain text: https://secwatch.observer/filing/0001438472-26-000017.txt

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