Miami International Holdings completes £70.4m acquisition of The International Stock Exchange, expanding European bond market footprint

Miami International Holdings, Inc. (MIH), the U.S.-based financial exchange operator behind several SEC-registered platforms, has finalized its acquisition of The International Stock Exchange Group Limited (TISE), a Guernsey-based securities listing venue widely recognized for its European bond market presence. The acquisition, executed via MIH’s wholly owned UK subsidiary MIH East Holdings, Limited, became effective on June 6, 2025, under a court-sanctioned scheme of arrangement.

The cash transaction values TISE at approximately £70.4 million (USD 91.5 million), with shareholders receiving £22.50 per ordinary share. This strategic move broadens MIH’s operational reach into the European capital markets landscape and consolidates its position as a global exchange operator.

Why Miami International Holdings acquired The International Stock Exchange

Miami International Holdings, based in Princeton, New Jersey, has steadily expanded its footprint across U.S. and international securities markets. In recent years, the firm has developed a multi-asset exchange infrastructure encompassing options, equities, and futures through its MIAX suite—MIAX, MIAX Pearl, MIAX Emerald, and MIAX Sapphire—as well as international ventures such as the Bermuda Stock Exchange (BSX).

The acquisition of TISE marks a significant milestone in MIH’s strategic play for Europe. TISE, headquartered in Guernsey in the Channel Islands, operates one of Europe’s key listing venues for high yield bonds, structured finance securities, and sustainability-linked debt. As of year-end 2024, the exchange listed more than 4,400 securities with a total market value exceeding £750 billion (USD 975 billion), underlining its critical role in European capital formation.

Thomas P. Gallagher, Chairman and CEO of Miami International Holdings, called the acquisition “a key milestone in advancing our international growth strategy,” citing TISE’s market stature and the collaborative role of the TISE board in finalizing the transaction. Gallagher also thanked Anderson Whamond, a TISE director, for his role in guiding the deal to completion.

TISE’s bond market leadership and strategic value to MIAX

The International Stock Exchange has cultivated a specialized niche in the Qualified Investor Bond Market (QIBM), its flagship platform for listing corporate bonds, securitized instruments, and structured products. This market segment has been particularly attractive to institutional issuers seeking flexible listing rules and efficient time-to-market processes.

TISE also supports UK Real Estate Investment Trusts (REITs), private investment funds, and other structured vehicles, offering issuers regulatory clarity and international investor access. In 2020, the Guernsey-based firm launched TISE Sustainable, a dedicated segment for ESG-focused issuers, tapping into the fast-growing market for green and sustainable finance.

From MIAX’s perspective, TISE offers not just geographic diversification but also operational synergies. According to Gallagher, MIH plans to invest in TISE’s technology infrastructure, enhance business development efforts, and streamline operational processes. This is expected to improve listing workflows, investor accessibility, and long-term exchange value.

The move echoes MIH’s earlier expansion into Bermuda with the acquisition of BSX, which allowed the group to gain footholds in niche, lightly regulated financial jurisdictions popular with alternative asset managers and global fund vehicles.

Institutional and market implications of the MIH–TISE deal

The integration of TISE into Miami International Holdings’ portfolio is anticipated to generate operational leverage and bolster MIAX’s global capital markets value proposition. For institutional market participants, the transaction may signal further harmonization of listing and trading infrastructure across U.S., Bermuda, and European exchanges.

In a prepared statement, Cees Vermaas, Chief Executive Officer of The International Stock Exchange, acknowledged MIH’s backing of TISE’s long-term growth trajectory. “We look forward to collaborating with the MIH team to further strengthen TISE’s credentials as a leading European listing venue,” Vermaas said, emphasizing continuity in strategy and personnel under the new ownership structure.

Market participants may see the acquisition as reinforcing MIAX’s competitive position relative to other global multi-asset exchange operators such as Nasdaq and Cboe Global Markets, both of which have been active in non-U.S. acquisitions and technology partnerships.

While neither MIAX nor TISE is publicly traded, industry sentiment suggests the transaction is aligned with broader exchange sector trends favoring cross-border platform consolidation, increased product diversity, and digital infrastructure upgrades.

Legal advisors and transaction details

To complete the deal, Miami International Holdings was advised by Reed Smith LLP (U.K. counsel) and Mourant Ozannes (Guernsey counsel). TISE retained Ashurst LLP for English legal support and Walkers (Guernsey) LLP for local jurisdictional matters. Financial advisory was provided by Zeus Capital Limited for MIH and Investec Bank plc for TISE.

The transaction was approved by TISE shareholders and sanctioned under Part VIII of the Guernsey Companies Law, enabling seamless transfer of ownership through a scheme of arrangement—a court-approved restructuring process typically used in U.K. and Channel Island M&A activity.

What this means for the European capital markets landscape

With TISE now operating as “TISE – A MIAX Company,” the European securities market could see stronger ties with North American platforms, offering issuers dual-listing paths and investors more integrated access to cross-border capital.

From a regulatory perspective, TISE continues to operate under Guernsey Financial Services Commission oversight, retaining its status as a well-regarded offshore exchange with EU-facing appeal. However, MIAX’s backing may result in increased investments in listing infrastructure, automation, and cross-listing technology, bringing TISE closer to global regulatory and technological standards.

For fund managers, structured finance players, and corporate treasury desks, this deal potentially unlocks a simplified route to international listing visibility and operational interoperability between U.S. and European markets.

While Miami International Holdings has not disclosed a formal post-acquisition roadmap, Gallagher has indicated that TISE will play a “central role in expanding [MIAX’s] international footprint.” Analysts tracking exchange-sector M&A believe further inorganic growth is likely from MIAX, especially in secondary markets or fintech infrastructure.

The company’s existing subsidiaries—including MIAX Futures (a registered CFTC derivatives exchange), MIAXdx (a DCM and SEF), and BSX (a hub for insurance-linked securities and debt instruments)—position the group to offer full lifecycle securities services across major asset classes.

TISE’s continued presence in Dublin, the Isle of Man, Jersey, and London also provides MIAX a multi-jurisdictional operational base across the European economic corridor.