MIAX Shares Surge 37.7% After TISE Acquisition and $100M Warburg Pincus Investment

Introduction

Miami International Holdings, Inc. (ticker: MIAX) is a U.S.-based parent holding company for a family of regulated financial marketplaces. Trading on the New York Stock Exchange under the symbol MIAX, the company closed at $31.6629 on August 13, 2025, reflecting a 37.66% increase on the day with a volume of 439,545 shares. Through proprietary, fully electronic platforms, Miami International Holdings provides access to U.S. options, equities, futures, and international capital markets.

Corporate Structure

Founded in 2008, Miami International Holdings comprises:

• Miami International Securities Exchange (MIAX®), MIAX Pearl®, MIAX Emerald®, MIAX Sapphire™
• MIAX Futures™ Exchange and MIAX Derivatives Exchange (MIAXdx™)
• Minneapolis Grain Exchange (MGEX™) and Dorman Trading, LLC
• The Bermuda Stock Exchange (BSX™) and The International Stock Exchange (TISE)

According to LinkedIn data, Miami International Holdings employs between 51 and 200 staff across its Princeton, New Jersey headquarters and offices in Chicago, Miami, Minneapolis, Bermuda, Guernsey, Dublin, the Isle of Man, Jersey, and London. The company’s technology arm, Miami International Technologies, LLC, develops low-latency trading systems, while MIAX Global, LLC focuses on mergers, acquisitions, and joint ventures outside North America.

Trading floor by Ellicia

Recent Developments and News

• On August 12, 2024, MIAX Sapphire™ launched its electronic national securities exchange. A physical trading floor in Miami is scheduled to open in 2025.
• On August 22, 2024, Warburg Pincus announced a $100 million growth investment in Miami International Holdings, with the option to expand its stake. This funding will support expansion in futures, proprietary products, and acquisitions.
• On June 6, 2025, Miami International Holdings completed its acquisition of The International Stock Exchange Group Limited (TISE) for £22.50 per share (approximately $29.25 at a 1.30 GBP/USD rate), valuing TISE at £70.4 million ($91.5 million).

Financial and Strategic Analysis

The 37.66% share price gain on August 13, 2025 indicates increased investor interest, associated with the Warburg Pincus investment and the TISE acquisition. The $100 million capital infusion supports several strategic initiatives:

• Building a physical trading floor for MIAX Sapphire in Miami, which is expected to enhance market participation and diversify revenue streams.
• Funding technology upgrades, including next-generation matching engines and clearing capabilities for agricultural and financial futures on MGEX and MIAXdx.
• Pursuing international expansions and mergers and acquisitions opportunities leveraging BSX’s and TISE’s regulatory frameworks.

While trading volume on August 13 reached 439,545 shares, the company’s overall liquidity and market capitalization have expanded alongside its presence in multi-asset exchanges.

Market Position and Industry Context

Miami International Holdings operates in a competitive environment alongside established U.S. options and futures exchanges, including the Chicago Board Options Exchange and Intercontinental Exchange. Its proprietary, in-house technology platforms emphasize throughput, latency, and reliability, positioning MIAX to attract high-frequency and institutional participants. Internationally, BSX provides a regulatory framework for digital assets in Bermuda, while TISE serves as one of Europe’s principal professional bond markets, with over 4,400 securities and a total market value exceeding £750 billion as of December 31, 2024.

tl;dr

On August 13, 2025, MIAX shares increased by 37.66% to $31.6629 on heavy volume following the June 6 completion of its £70.4 million acquisition of TISE and the $100 million investment from Warburg Pincus on August 22, 2024. The capital will fund a Miami trading floor for MIAX Sapphire opening in 2025, technology upgrades across futures platforms, and further international growth. The company aims to broaden its asset-class offerings and geographic reach.