MIAMI INTERNATIONAL HOLDINGS, INC. 8-K

What Happened

• Miami International Holdings, Inc. announced the closing of a previously announced agreement to sell 90% of the issued and outstanding equity of MIAX Derivatives Exchange (MIAXdx) to a joint venture established by Robinhood Markets, Inc. in partnership with Susquehanna International Group. The transaction was effective January 20, 2026, and announced via a press release dated January 21, 2026. MIAX retained a 10% ownership interest in MIAXdx. MIAXdx had been a wholly owned subsidiary of the company prior to the sale.

Key Details

• Transaction effective date: January 20, 2026.
• Percentage sold: 90% of issued and outstanding equity of MIAXdx.
• Buyer: Joint venture formed by Robinhood Markets, Inc. and Susquehanna International Group.
• MIAX ownership after closing: 10% (retained).
• The Form 8-K/press release did not disclose the purchase price or other financial terms.

Why It Matters

• This filing documents a material change in ownership of MIAX’s derivatives-exchange business: MIAX no longer fully owns MIAXdx and now holds a minority (10%) stake.
• The company did not disclose financial terms or the immediate accounting/financial impact in the 8-K, so investors should watch for subsequent filings (e.g., future 10-Q/10-K or additional 8-Ks) for details on proceeds, revenue recognition, and how MIAX will report its investment in MIAXdx going forward.