NEW YORK, June 17, 2026 – Proskauer advised Glouston Capital Partners (Glouston), a Boston-based private equity secondaries manager with over $3.4 billion in assets under management (AUM) on its definitive agreement to be acquired by Flexstone Partners (Flexstone), a global private markets investment manager and an affiliate of Natixis Investment Managers.
The combined platform will bring together two highly complementary businesses – Flexstone’s global primary and co-investment platform and Glouston’s North American secondary capabilities — to manage more than $15 billion in assets across Primary, Co-Investment, and Secondary strategies, serving investors across North America, Europe, and Asia.
The Proskauer team advising Glouston was led by partners Grant Darwin and Steve Peck (M&A), Howard Beber and Louis Sorgi (Private Funds), as well as associate Sean Donoghue (M&A). It also includes associates Julien Burger, Samantha Volpe and Allyson Swartzberg, and law clerk Anna Sykes (M&A); partners Nathan Schuur and Agnès Rossi, and associates Edward Guers, Kyle Litfin, Jordan Greene and Mikaella Boniel (Private Funds); partners Scott Jones and Aaron Lee, and associates Tom Multari and Jessie Lin (Tax); partner Seth Safra, and associate Alyssa Swanstrom (Compensation and Benefits); partners Mary Wilks, John Verwey and John Ingrassia (Antitrust); and partner Nathan Lander (Insurance).