New Mountain Capital-Backed Grant Thornton Advisors to Combine With Grant Thornton Ireland Advisory and Tax Businesses

New Mountain Capital-backed Grant Thornton Advisors platform acquires Grant Thornton UAE

April 23, 2025

Professional Services

Grant Thornton UAE announced it reached an agreement to unite with Grant Thornton Advisors LLC, adding the UAE firm to the multinational Grant Thornton Advisors platform. The platform is backed by an investor group led by New Mountain Capital and is intended to broaden unified advisory and tax capabilities across regions and service lines.

New Mountain Capital Makes Growth Investment in Grant Thornton LLP

March 15, 2024

Accounting & Tax

New Mountain Capital has made a growth investment in Grant Thornton LLP to accelerate the firm's business strategy, support targeted investments in talent, technology and infrastructure, and enable strategic acquisitions. The transaction (subject to regulatory approvals) will adopt an alternative practice structure separating attest and non-attest services, and is expected to close in the second quarter of 2024.

Grant Thornton Multinational Platform Adds Grant Thornton Switzerland/Liechtenstein and Grant Thornton Channel Islands

June 17, 2025

Professional Services

Grant Thornton Advisors LLC announced that Grant Thornton Switzerland/Liechtenstein and Grant Thornton Limited (Channel Islands) will join the multinational platform it formed with Grant Thornton Ireland, expanding the platform's footprint across key European financial hubs. The platform is backed by an investor group led by New Mountain Capital and will broaden Grant Thornton's audit, tax and advisory capabilities in Switzerland, Liechtenstein, Jersey and Guernsey.

Grant Thornton Advisors Acquires Stax

September 22, 2025

Professional Services

Grant Thornton Advisors LLC has closed its transaction to acquire Stax, a strategy consulting firm focused on commercial due diligence, value creation, and exit-planning services for private equity firms and their portfolio companies. The deal adds Stax’s ~300 team members to Grant Thornton Advisors’ multinational transaction advisory platform, with the combined firm serving almost 70% of the U.S.-based Private Equity International 300.

Guidehouse Acquires Grant Thornton Public Sector Advisory Practice

August 22, 2022

Professional Services

Guidehouse, a Veritas Capital portfolio company, signed an agreement to acquire Grant Thornton LLP’s Public Sector Advisory practice. The deal brings additional public-sector consulting professionals to Guidehouse and is expected to close in the second half of 2022; it was later completed on October 3, 2022.

Mercer Global Advisors Acquires Thompson Advisory Services

December 10, 2025

Financial Services

Mercer Global Advisors has acquired Thompson Advisory Services, a Portland-based registered investment adviser managing approximately $260 million in client assets. The four-person team from Thompson Advisory will join Mercer to expand the firm’s presence in the Pacific Northwest and gain access to Mercer’s institutional capabilities in investment management, tax, trust and estate planning.