Grant Thornton Channel Islands joins multinational platform

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CHICAGO and JERSEY, October 3, 2025 – Grant Thornton Channel Islands has completed a transaction that makes it part of the Grant Thornton Advisors multinational platform — which was established in January 2025 with the support of an investor group led by New Mountain Capital.

The deal underscores the platform’s seamless connectivity and capabilities across the Americas, Europe and the Middle East, building on the recently announced platform acquisitions of Grant Thornton member firms in Ireland, France, the United Arab Emirates, Spain, the Netherlands, Switzerland/ Liechtenstein, Belgium, the Cayman Islands and Luxembourg.

The platform also includes Auxis, a pioneer in outsourcing and business modernization services, and Stax, which specializes in commercial due diligence and value creation.

The platform, and its 270 professionals in the Channel Islands, now delivers a singular client experience that includes enhanced solutions and capabilities, backed by powerful technologies and a distinctive cross-border culture.

It remains part of the Grant Thornton International Limited network, which comprises member firms in more than 150 markets worldwide.

The transaction was originally announced in June of 2025.

About Grant Thornton

Grant Thornton delivers professional services in the US through two specialized entities: Grant Thornton LLP, a licensed, certified public accounting (CPA) firm that provides audit and assurance services ― and Grant Thornton Advisors LLC (not a licensed CPA firm), which exclusively provides non-attest offerings, including tax and advisory services.

In January 2025, Grant Thornton Advisors LLC formed a multinational, multidisciplinary platform. The platform offers a premier advisory and tax practice, as well as independent audit practices. With almost 60 offices, the platform delivers a singular client experience that includes enhanced solutions and capabilities, backed by powerful technologies and a roster of 14,000 quality-driven professionals enjoying exceptional career-growth opportunities and a distinctive cross-border culture.

Grant Thornton is part of the Grant Thornton International Limited network, which provides access to its member firms in more than 150 global markets.

Grant Thornton LLP, Grant Thornton Advisors LLC and their respective subsidiaries operate as an alternative practice structure (APS). The APS conforms with applicable laws, regulations and professional standards, including those from the American Institute of Certified Public Accountants.

“Grant Thornton” refers to the brand under which the member firms in the Grant Thornton International Ltd (GTIL) network provide services to their clients and/or refers to one or more member firms. Grant Thornton LLP and Grant Thornton Advisors LLC serve as the U.S. member firms of the GTIL network. GTIL and its member firms are not a worldwide partnership and all member firms are separate legal entities. Member firms deliver all services; GTIL does not provide services to clients.

Experts / Authors

Stephen Tennant Stephen is the managing partner of Grant Thornton Ireland and previously led the firm’s financial services advisory practice. He has extensive experience in delivering practical solutions to regulatory challenges faced by global financial institutions. View Profile

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Press Release

Grant Thornton Channel Islands joins multinational platform

03 Oct 2025

The platform also includes Auxis, a pioneer in outsourcing and business modernization services, and Stax, which specializes in commercial due diligence and value creation.

It remains part of the Grant Thornton International Limited network, which comprises member firms in more than 150 markets worldwide.

The transaction was originally announced in June of 2025.

About Grant Thornton

Grant Thornton is part of the Grant Thornton International Limited network, which provides access to its member firms in more than 150 global markets.

Experts / Authors

Stephen Tennant

Stephen is the managing partner of Grant Thornton Ireland and previously led the firm’s financial services advisory practice. He has extensive experience in delivering practical solutions to regulatory challenges faced by global financial institutions.

View Profile