Grant Thornton Spain completes deal, joins Grant Thornton Advisors multinational platform

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CHICAGO and MADRID, November 14, 2025. Grant Thornton Spain has completed a transaction that makes it part of the Grant Thornton Advisors multinational platform, further enhancing the platform’s position as a leading provider of cross-border services underpinned by investments in technology, people, and quality.

This follows recently announced transactions with other European Grant Thornton member firms, including those in Ireland, France, Belgium, Luxembourg, the Netherlands, Switzerland/Liechtenstein, the Channel Islands and Poland — along with Grant Thornton firms in the United Arab Emirates, the Cayman Islands, New Zealand and Brazil.

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

Grant Thornton Spain is a significant, high-momentum member of the Grant Thornton network — with thousands of clients serviced by nearly 900 professionals across 10 locations. It has grown quickly thanks to its reputation for creative, forward-thinking solutions and deep sector expertise in areas such as financial services, mobility and energy.

The Grant Thornton multinational platform was established in January 2025 with the support of an investor group led by New Mountain Capital. It now extends from the Americas across Europe and the Middle East to the Asia Pacific region.

This transaction will support the platform’s accelerated growth across Europe. Clients will benefit from access to an even more extensive array of industry expertise and innovative solutions.

The expanded platform remains part of the Grant Thornton International Limited network, which includes member firms in more than 150 markets worldwide.

The transaction was originally announced in June 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 offices across the Americas, Europe and the Middle East, the platform delivers a singular client experience that includes enhanced solutions and capabilities, backed by powerful technologies and a roster of almost 20,000 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.

About Grant Thornton Spain

With 40 years of experience in the Spanish market, Grant Thornton Spain is one of the leading professional services firms in the country, specializing in Audit and Assurance, Tax, Advisory, Legal, and Outsourcing. It has a team of 900 professionals spread across 11 offices nationwide: Madrid, Barcelona, Bilbao, Castellón, Las Palmas, Murcia, Pamplona, Valencia, Vigo, and Zaragoza. The firm is also part of Grant Thornton International, with 76,000 professionals operating in more than 150 markets worldwide.

About New Mountain Capital

New Mountain Capital is a New York-based investment firm that emphasizes business building and growth, rather than debt, as it pursues long-term capital appreciation. The firm currently manages private equity, credit and net lease investment strategies with approximately $55 billion in assets under management. New Mountain Capital seeks out what it believes to be the highest quality growth leaders in carefully selected industry sectors and then works intensively with management to build the value of these companies. For more information on New Mountain Capital, please visit newmountaincapital.com.

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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