Flexstone Partners to Acquire Glouston Capital Partners to Form $15 Billion Private Equity Platform

Flexstone Partners has announced its agreement to acquire Glouston Capital Partners for an undisclosed amount, a transaction that will create a combined firm managing over $15 billion in assets. The deal, which was revealed on June 17, 2026, positions Flexstone as a significant player in the private markets landscape, enhancing its capabilities in both primary and secondary investment strategies.

Flexstone Partners, an affiliate of Natixis Investment Managers, currently manages approximately $12 billion in assets, while Glouston Capital Partners, based in Boston, oversees over $3.4 billion. The merger will leverage Flexstone's established global primary and co-investment platform alongside Glouston's expertise in North American secondary markets. This strategic alignment is expected to create a more comprehensive offering for institutional investors across North America, Europe, and Asia.

The acquisition is characterized by its complementary nature, with minimal overlap between the two firms' operations. Glouston's seasoned team and strong relationships within the North American middle market are anticipated to bolster Flexstone's secondary investment capabilities. The continuity of both firms' investment teams will be maintained post-transaction, ensuring that existing clients benefit from a stable management structure while gaining access to an expanded range of investment strategies.

This merger reflects broader trends within the private equity sector, where there is increasing demand for scalable and high-quality private markets solutions. Philippe Setbon, CEO of Natixis Investment Managers, highlighted the growing investor appetite for private assets, indicating that the combined entity is well-positioned to meet these evolving needs. The integration of Glouston's differentiated middle-market strategy with Flexstone's established global platform is expected to enhance the overall value proposition for clients.

As the private equity landscape continues to evolve, this transaction underscores the importance of strategic partnerships in achieving growth and competitive advantage. The combined firm will operate from five offices globally, employing 37 investment professionals, and will maintain its focus on tailored investment solutions. The successful integration of Glouston into Flexstone's operations may set a precedent for future consolidations within the sector, as firms seek to enhance their market presence and operational efficiencies in a rapidly changing investment environment.