Marex (NASDAQ: MRX) completes Winterflood acquisition—what this means for UK equity markets

Marex Group plc (NASDAQ: MRX) completes key acquisition to expand UK equity market-making footprint, while selling off non-core custody services arm to Epiris LLP

Marex Group plc, the diversified global financial services platform listed on the Nasdaq under the ticker MRX, has completed its acquisition of Winterflood Securities, a well-known equity market maker in the United Kingdom. Alongside the closure of the deal, Marex has also announced a separate agreement to divest Winterflood’s custody arm, Winterflood Business Services, to private equity firm Epiris LLP, streamlining its equity execution operations.

The strategic move significantly strengthens Marex’s presence in the UK’s capital markets. It also underscores a clear focus on higher-margin businesses by shedding back-office custody operations that fall outside Marex’s long-term product roadmap.

The acquisition of Winterflood was finalized following regulatory approvals and is valued at approximately £103.9 million in cash. This includes a £15 million premium over book value, reflecting the market’s perception of Winterflood’s value as one of the UK’s top three equity trading counterparties by volume on the London Stock Exchange.

How does the Winterflood acquisition enhance Marex’s UK capital markets strategy?

The completion of the Winterflood transaction enables Marex to consolidate and upgrade its UK equity execution platform, adding over 400 institutional clients and integrating Winterflood’s proprietary trading technology and market access systems. Analysts believe this integration positions Marex to capture a larger share of institutional execution flows while improving distribution to asset managers, wealth managers, and investment platforms.

Winterflood’s standing in the UK equity markets is significant. With a 15 percent share of total equity trading volumes on the London Stock Exchange and decades of relationships with institutional brokers, Winterflood brings scale, credibility, and access that Marex had been strategically aiming to build organically. The deal accelerates Marex’s equity expansion goals and allows it to pursue further product diversification across its multi-asset platform.

Ian Lowitt, Chief Executive Officer of Marex Group, said that the acquisition aligns with the firm’s disciplined approach to capital deployment and will allow Marex to materially improve the retained Winterflood business’s profitability within the next two to three years. Marex expects the adjusted pre-tax profit margin of the Winterflood unit to expand to 20 percent over time, with current annual revenues from the retained equity business estimated at around $75 million.

Why is Marex divesting the custody and settlement business to Epiris?

Marex’s agreement to sell Winterflood Business Services (WBS) to Epiris Fund III represents a deliberate move to focus on front-office capital markets activities rather than back-office processing. WBS provides outsourced dealing, custody, and settlement services to a diverse set of clients, including wealth managers, institutional investment platforms, and retail brokers.

While WBS is a profitable and operationally sound business, Marex executives emphasized that it falls outside the core financial services that the group aims to offer its institutional clients. The divestment is also expected to more than offset the £15 million premium paid for Winterflood, resulting in a net financial gain for Marex upon deal completion.

The divestiture is expected to close in the second quarter of 2026, subject to regulatory and commercial closing conditions. Upon completion, all employees supporting WBS will transition to Epiris. This ensures operational continuity for WBS clients while freeing Marex from managing custody infrastructure that does not directly contribute to its strategic capital markets growth engine.

Epiris LLP, a UK-based private equity firm, has a track record of acquiring and scaling financial infrastructure businesses. Observers believe the WBS unit could benefit from targeted investment in digital operations and client onboarding as Epiris seeks to grow its footprint in financial services outsourcing.

What is the institutional sentiment around Marex’s capital deployment strategy?

Analysts covering Marex Group plc noted that the combination of Winterflood’s execution platform with Marex’s multi-asset reach could make the group a stronger counterparty in European equities, particularly for clients seeking integrated execution and access to structured products. The strategic rationale was viewed favorably, especially given the divestiture of the custody business, which removes operational complexity while boosting financial returns.

Bradley Dyer, Chief Executive Officer of Winterflood Securities, said that joining Marex gives the firm a platform to grow its core business under a parent with a strong balance sheet and a high-growth mindset. Dyer highlighted that clients would continue to be served by the same teams, while gaining access to a wider array of financial products through Marex’s global platform.

Financial analysts believe Marex’s move to retain Winterflood’s execution and corporate broking arms, while exiting the back-office custody segment, reflects an increasingly common trend among capital markets firms looking to simplify operations, drive margin expansion, and redeploy capital to front-office initiatives.

How are Close Brothers Group shareholders affected by the Winterflood sale?

Close Brothers Group plc, the previous owner of Winterflood, announced that the deal officially closed on December 1, 2025, following regulatory clearance. The group had initially disclosed the sale on July 25, 2025, as part of its portfolio reshaping strategy. Close Brothers will continue to classify Winterflood’s financial results under discontinued operations until the acquisition date.

Mike Morgan, Chief Executive Officer of Close Brothers Group, noted that Marex was a suitable long-term steward for the Winterflood franchise and expressed confidence in the value being unlocked for shareholders through the transaction. The divestment is expected to improve Close Brothers’ capital position and allow for reinvestment in its core banking and asset management verticals.

The Winterflood disposal is one of the most high-profile moves by Close Brothers in recent years as it pivots toward more capital-efficient business lines. Industry observers are watching closely to see if similar divestitures or reconfigurations follow in 2026.

What are the financial expectations and forward-looking indicators for Marex?

Marex indicated that its performance in November 2025 remained strong, continuing the momentum built through earlier quarters. Although the group has not issued revised full-year guidance following the Winterflood transaction, investor expectations are shifting toward a bullish outlook for 2026.

The group’s ability to absorb Winterflood’s operating infrastructure without disruption, combined with the anticipated sale of WBS, is expected to reflect positively on Marex’s margin profile in the second half of 2026. Analysts expect Marex to provide more concrete financial updates in its next earnings release, particularly around integration synergies, cross-selling potential, and adjusted return metrics for the equity unit.

The Winterflood acquisition also provides Marex with additional regulatory licenses and infrastructure needed to expand its European equities trading and distribution capabilities, which may open new growth corridors in the coming fiscal year.

What are the key takeaways from Marex’s acquisition of Winterflood and sale of its custody unit?

• Marex Group plc (NASDAQ: MRX) has completed its £103.9 million acquisition of Winterflood Securities from Close Brothers Group plc, including a £15 million premium.

• The transaction significantly enhances Marex’s UK cash equities presence, adding over 400 institutional clients and a top-three trading position on the London Stock Exchange.

• Marex will retain Winterflood’s equity market-making and corporate broking activities, which are projected to generate around $75 million in annual revenue.

• Profit margins for the retained Winterflood business are expected to improve to approximately 20 percent over time, driven by integration synergies and scale.

• Simultaneously, Marex has signed a conditional agreement to divest Winterflood Business Services to Epiris Fund III, with deal closure expected in the second quarter of 2026.

• The sale of the custody arm is designed to streamline Marex’s business and will result in a net financial gain, fully offsetting the premium paid for the acquisition.

• Employees associated with Winterflood Business Services will transfer to Epiris, ensuring continuity for custody clients during the transition.

• Analysts view the transaction as net accretive, with Marex sharpening its focus on front-office capital markets and equity execution growth.

• Close Brothers Group plc exits the Winterflood franchise and intends to reallocate capital toward its core banking and asset management businesses.

• Investor sentiment remains positive, with equity analysts maintaining a “buy” stance on Marex shares and anticipating further gains in 2026 as integration milestones are met.