Grant Thornton Advisors agrees to expand multinational platform in Europe with addition of Polish firm
CHICAGO and WARSAW, November 5, 2025 – The Grant Thornton Advisors platform has announced its intention to expand by adding Grant Thornton Poland — a move that will deepen the platform’s footprint in Europe and signals its continued investment in cross-border professional services.
The transaction, backed by an investor group led by New Mountain Capital, will bring Grant Thornton Poland’s more than 1,200 professionals and US$70 million in annual revenue into a platform of 14 firms worldwide, eight of which are based in Europe — namely Grant Thornton firms in Ireland, France, Spain, Netherlands, Belgium, Luxembourg, the Channel Islands and Switzerland/Liechtenstein.
Over the past decade, Grant Thornton Poland has tripled its headcount and increased its revenues fivefold, growing both organically and through mergers and acquisitions. The firm is a trusted provider of audit, tax, legal, payroll and accounting services, and is also known for its strong advisory services for mergers and acquisitions as well as digital consulting.
“Poland is one of Europe’s most resilient and rapidly evolving economies, with a range of thriving industries and an appetite for sophisticated services,” said Jim Peko, CEO of Grant Thornton Advisors LLC. “Making Grant Thornton Poland part of the platform, which blends local expertise with multinational scale, will allow us to bring new levels of integrated service and quality to Central and Eastern Europe.”
“Grant Thornton Poland is an ideal addition to our already impressive European footprint,” said Steve Tennant, CEO for Europe, the Middle East and Africa at the Grant Thornton Advisors multinational platform. “By adding the Polish firm, we’ll expand our ability to deliver seamless, borderless solutions, all while strengthening our position in the region and reinforcing our commitment to helping clients navigate complexity with speed, scale and quality.”
Tennant also applauded Grant Thornton Poland’s technology and software capabilities, augmenting the platform’s broader push toward digital enablement, including a US$1 billion investment in cutting-edge AI tools and technology.
According to Tomasz Wróblewski, CEO of Grant Thornton Poland: “The multinational platform we are joining creates unprecedented opportunities — both for us and for our clients. Through this collaboration, we gain access to advanced technological solutions, many powered by AI. And this is precisely what our employees and clients expect from us. Moreover, a consistent and fully integrated platform offers clients even better cross-border service and provides our employees with opportunities for development in a multinational environment.”
The expansion in Europe complements the platform’s growing presence in the Americas, the Middle East and Asia-Pacific, where recent transactions include firms in the Cayman Islands, the United Arab Emirates and New Zealand. The platform has also added specialized US firms such as Auxis, a pioneer in outsourcing and business modernization, and Stax, a leader in commercial due diligence and value creation.
The expanded platform will continue to be part of the Grant Thornton International Limited network, which comprises member firms in more than 150 markets worldwide.
The transaction remains subject to finalization of definitive documentation and regulatory approval.