Press Release
Grant Thornton Advisors expands multinational platform by welcoming Grant Thornton New Zealand
03 Nov 2025
CHICAGO and AUCKLAND, November 3, 2025 – Grant Thornton Advisors LLC (Grant Thornton Advisors) today announced that its multinational platform is growing to include Grant Thornton New Zealand — a move that extends the platform’s reach across 20 time zones into the Asia Pacific region.
The New Zealand firm is a recognized leader in its region, with US$40+ million in annual revenue and a team of more than 300 dedicated professionals. It is known for its strength in key markets and its reputation for delivering leading audit, tax and advisory services.
Grant Thornton Advisors launched its platform earlier this year with the support of an investor group led by New Mountain Capital — and is already bringing more than a dozen high-performing firms across the Americas, Europe and the Middle East into an integrated advisory and tax practice, complemented by independent audit practices.
The platform currently includes Grant Thornton firms in the US, Ireland, France, the United Arab Emirates, the Netherlands, the Channel Islands and the Cayman Islands. Additionally, it previously announced transactions with Grant Thornton firms in Spain, Switzerland, Liechtenstein, Belgium and Luxembourg, which it anticipates closing in the coming weeks. Further, it has added top firms serving strategic markets and industries, including Auxis, a pioneer in outsourcing and business modernization — and Stax, a specialist in commercial due diligence and value creation.
Jim Peko, CEO of Grant Thornton Advisors LLC, said:
“Modern businesses demand seamless service and consistent quality — whether they’re operating in New York, Auckland or locations in between. By welcoming Grant Thornton New Zealand to our platform, we’re expanding our multinational reach into a vital region with a firm that shares our ambition and values. Together, we’re building a truly borderless one-of-a-kind platform that delivers exceptional outcomes across industries and geographies.”
According to Russell Moore, CEO of Grant Thornton New Zealand:
“This is an extremely exciting time for Grant Thornton New Zealand — for our business, our people and for the clients we work alongside. As our market continues to evolve, businesses are looking for smarter solutions, deeper expertise and global connectivity. By joining Grant Thornton Advisors, we can deliver all three — bringing world-class technology, insight and capital to help our clients grow with confidence, both in New Zealand and beyond.”
The transaction is expected to close later this year.
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.
Simpson Thacher & Bartlett LLP and MinterEllison provided transaction services to Grant Thornton Advisors. Major advisors to Grant Thornton New Zealand included Tompkins Wake.
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 more than 18,000 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 New Zealand
Grant Thornton New Zealand is a leading professional services firm providing audit, tax, and advisory services to dynamic organisations across key sectors of the New Zealand economy. With 37 partners and more than 300 professionals and in Auckland, Wellington and Christchurch, we combine local insight with global reach through the Grant Thornton International network, spanning more than 150 markets.
We’re known for our collaborative, client-centred approach and invest the time needed to understand each client’s ambitions, challenges and opportunities. Our teams combine deep technical expertise with fresh, commercial insight to deliver practical solutions that create real impact. Agile and responsive, we work alongside clients to achieve the outcomes that matter most - whether that’s improving performance, growing value, or building investor and stakeholder confidence.
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
