Grant Thornton acquires GT firms in France, Spain and Belgium

Grant Thornton Advisors LLC is growing internationally, as Grant Thornton’s member firms in France, Spain and Belgium join the platform, fueled by private equity investment.

The move comes after acquisitions of Grant Thornton member firms in the United States, Ireland, the United Arab Emirates, the Netherlands, Switzerland, Liechtenstein, the Cayman Islands, Luxembourg and the Channel Islands.

The Chicago-based Top 10 Firm received a private equity investment last year from New Mountain Capital, which took a majority stake and prompted GT to set up an alternative practice structure, with Grant Thornton Advisors providing non-attest services. In January, it combined with Grant Thornton Ireland to create an integrated international firm. In June, it added Grant Thornton Switzerland/Liechtenstein and Grant Thornton in the Channel Islands. In April, it announced agreements with GT firms in Luxembourg, the United Arab Emirates and the Cayman Islands, as well as GT Netherlands in May. Now Grant Thornton France, Grant Thornton Spain and Grant Thornton Belgium are joining the platform.

Financial terms of the deal were not disclosed. Grant Thornton France has 2,800 professionals and revenues of €287.7 million ($337 million). Grant Thornton Spain has 900 professionals and revenues of €100.3 million ($118 million).  Grant Thornton Belgium has 275 professionals and revenues of more than €40 million ($47 million). Grant Thornton ranked No. 8 on Accounting Today‘s 2025 list of the Top 100 Firms, with $2.365 billion in annual revenue.

“Expanding the platform into France, Spain and Belgium is a defining chapter in our journey and represents a sea change in how our industry serves clients,” said Grant Thornton Advisors CEO Jim Peko in a statement Monday. “We’re furthering our commitment to growth across services, industries and geographies. And we’re solidifying Grant Thornton as the platform of choice for talent and technology, underpinned by exceptional quality and our one-of-a-kind culture. We set out to build something bold and that’s exactly what we’re doing.”

The entire Grant Thornton Advisors platform will continue to be part of the Grant Thornton International network, with member firms in more than 150 markets worldwide. The deals are all expected to close in the weeks ahead.

In recent weeks, Grant Thornton Advisors has also announced deals to expand its advisory offerings, adding Auxis, a provider of outsourcing and business modernization services, and Stax, which specializes in commercial due diligence and value creation.