Grant Thornton International
A global network of independent member firms providing audit, tax and advisory services, with a particular focus on privately held and mid-market organizations.
Last updated November 2, 2026
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Overview
Grant Thornton International is the international coordinating organization for a global network of independent accounting and professional-services firms. The network serves privately owned businesses, listed companies, public-interest entities, governments and public-sector organizations through three principal service areas: assurance, tax and advisory. Its work commonly includes external audit, financial reporting, transaction support, restructuring, risk management, consulting, forensic investigations, technology, tax compliance and tax planning. The modern network was formed in 1980 when the United States firm Alexander Grant & Co. and the United Kingdom firm Thornton Baker joined with 49 other firms. The two principal firms had broadly comparable positions in their respective markets and shared an emphasis on serving growing and medium-sized businesses. In 1986, Alexander Grant & Co. and Thornton Baker adopted the Grant Thornton name, helping create a more consistent international identity. Grant Thornton International Ltd. is incorporated in England and Wales as a private company limited by guarantee. It is a not-for-profit, non-practising umbrella entity rather than a conventional multinational accounting partnership. It does not itself generally provide client services, issue audit opinions or own the local firms. Instead, separately governed member firms use the Grant Thornton brand and collaborate on cross-border engagements under the network's policies and quality framework. Local firms remain responsible for their own management, employees, clients, legal obligations and regulatory relationships. The network's historical roots extend beyond the 1980 formation. The British lineage includes Thornton and Thornton, established in Oxford in 1904, and Baker & Co., whose history reached back to 1868. These firms combined as Thornton Baker in 1959, and Thornton Baker later merged with Kidston, Jackson, McBain in 1975. The United States lineage began in Chicago in 1924, when Alexander Richardson Grant founded Alexander Grant & Co. after working as an accountant at Ernst & Ernst, now part of EY. An earlier international collaboration involving firms from Australia, Canada and the United States operated under the Alexander Grant Tansley Witt name from 1969. Grant Thornton positions itself as a major alternative to the Big Four, particularly for mid-market clients seeking international capability without the scale or structure of the largest four accounting networks. Its International Business Centres support cross-border work in major commercial locations, while the annual International Business Report surveys privately held mid-market businesses and provides research on business confidence, investment and economic expectations. The network has expanded through local mergers and affiliations. Examples include the 1987 merger with Carter Chaloner & Kearns; the 2007 combination of Grant Thornton UK with RSM Robson Rhodes; and later combinations or additions involving member firms in Russia, China, Australia, South Africa and Japan. These transactions strengthened local market coverage but did not turn the network into a single global operating company. Grant Thornton remains active internationally. Reference material describes a network of approximately 73,000 personnel in 147 markets and combined global member-firm revenue of approximately US$7.5 billion, although these figures are time-sensitive and should be read as reported network metrics rather than revenue of Grant Thornton International Ltd. itself. The organization has also faced regulatory, litigation and governance scrutiny, especially in the United Kingdom and Australia, reflecting the risks inherent in auditing, insolvency administration and public-sector consulting.
History
Grant Thornton's name combines two principal accounting lineages: a British lineage and a United States lineage. In Britain, Thornton and Thornton was established in Oxford in 1904. Baker & Co., another predecessor, traced its history to 1868. The two firms combined in 1959 as Thornton Baker, which later merged with Kidston, Jackson, McBain in 1975. That latter firm's history included the work of Scottish accountant Robert McCowan, who began practising in the nineteenth century and participated in the formation of an early Glasgow accounting institute. The American lineage began in Chicago in 1924, when Alexander Richardson Grant founded Alexander Grant & Co. Grant had previously worked as a senior accountant at Ernst & Ernst. He built the firm around services for medium-sized companies, a market orientation that continued after his death in 1938. In 1969, the firm joined with firms from Australia and Canada in an international organization called Alexander Grant Tansley Witt. In 1980, Alexander Grant & Co. and Thornton Baker joined 49 other firms to establish the Grant Thornton international organization. The participating firms were not converted into one global partnership; rather, they formed a coordinated network of independent national practices. In 1986, the two principal firms adopted the Grant Thornton name, giving the network a common commercial identity. The network expanded through affiliations and local combinations. It merged with Carter Chaloner & Kearns in 1987. Grant Thornton UK combined with RSM Robson Rhodes in 2007. Member-firm development in the following decade included combinations involving Rosexpertiza in Russia, Ascenda CPA in China, former BDO offices in Australia, PKF in Johannesburg, and SizweNtsalubaGobodo in South Africa. In Japan, additions involving Yusei Audit and Yamada & Partners expanded the local practice in 2018. Grant Thornton International Ltd. is incorporated in England and Wales as a private company limited by guarantee. It acts as a non-practising international umbrella organization and does not have share capital. Each national member firm is legally separate and is responsible for its own operations, personnel, clients and regulatory compliance. The network facilitates common methodologies, quality expectations, international referrals and cross-border delivery. During the twenty-first century, Grant Thornton has continued to develop its profile through research, international business services and diversity initiatives. Its International Business Report, conducted since 1992, surveys privately held mid-market businesses across multiple economies. The network has also been recognized in external employer surveys for perceived diversity and inclusion performance. At the same time, audit enforcement actions, civil claims and controversies involving member firms have generated scrutiny of audit quality, independence, professional scepticism and the management of conflicts between creditors, customers and other stakeholders.
- 2024
Malcolm Gomersall appointed chief executive
[1]Malcolm Gomersall replaced David Dunckley as chief executive.
- 2021
Patisserie Valerie audit sanction
[1]The FRC sanctioned Grant Thornton over failures in its audits of Patisserie Valerie.
- 2018
UK audit misconduct sanction
[1]The UK member firm was fined by the FRC over audit-related misconduct involving Nichols and the University of Salford.
- 2007
Grant Thornton UK merges with RSM Robson Rhodes
[1]The UK member firm expanded through a combination with RSM Robson Rhodes.
- 1986
Principal firms adopt the Grant Thornton name
[1]Alexander Grant & Co. and Thornton Baker changed their names to Grant Thornton.
- 1980
International Grant Thornton organization established
[1]Alexander Grant & Co., Thornton Baker and 49 other firms created the international network.
- 1959
Thornton Baker is formed
[1]Thornton and Thornton combined with Baker & Co. to form Thornton Baker.
- 1924
Alexander Grant founds Alexander Grant & Co.
[1]Alexander Richardson Grant established the Chicago accounting firm that became the principal American predecessor of Grant Thornton.
- 1904
Thornton and Thornton established in Oxford
[1]A predecessor of the British Grant Thornton practice was formed in Oxford.
Products and positioning
A globally coordinated alternative to the Big Four, emphasizing independent local firms, international reach and service to mid-market and privately held organizations. A globally coordinated but independently owned professional-services network positioned around assurance, tax, advisory, and transaction support for private businesses, public-interest entities, and public-sector organizations.
Assurance
Audit and assurance
Member firms audit financial statements and provide related assurance, accounting, controls, risk and reporting services. Engagements cover privately held businesses, public companies, public-interest entities and public-sector organizations, subject to local licensing and regulation.
Tax services
Tax
Tax practices provide compliance, advisory and transaction-related services. Typical work includes corporate and international tax, indirect taxes, employment taxes, transfer pricing, restructuring and support for business owners and privately held groups. The network provides tax services covering tax compliance and advisory needs. Local member firms support clients in navigating their applicable tax rules and business circumstances, with the exact scope varying by country and legal entity.
Consulting and advisory
Advisory
Advisory practices assist with strategy, operations, technology, risk, deals, valuations, investigations and performance improvement. Offerings vary by country because the network is composed of independent member firms. Grant Thornton’s advisory services address business and organizational issues beyond traditional accounting work. Depending on the market, member firms may support strategic, operational, financial, and other management decisions.
Business recovery
Restructuring and insolvency
Member firms advise distressed companies, lenders, creditors and other stakeholders on restructuring, recovery, insolvency administration and liquidation. These engagements can place practitioners in complex situations involving competing interests and vulnerable customers.
Research · 1992
International Business Report
The International Business Report is a recurring research program focused on privately held mid-market businesses. It tracks business confidence, expectations and concerns across participating economies and is used as a thought-leadership and market-insight platform.
Audit and assurance
Assurance
Grant Thornton member firms provide assurance services intended to support confidence in financial and other business information. The offering is part of the network’s core professional-services portfolio and is delivered according to the requirements and permissions applicable in each jurisdiction.
Transactions and corporate finance
Transaction services
Transaction services support organizations involved in corporate and financial transactions. The network identifies this area alongside assurance, tax, and advisory as part of its professional-services offering, although the precise services available depend on the relevant member firm.
Controversies
2022
Western Australia public-sector corruption findings
Western Australia's Corruption and Crime Commission reported that benefits were provided to public officials and that procurement rules were breached in connection with consulting contracts directed to Grant Thornton Australia.
2021
Patisserie Valerie audit failures
The FRC found failures in Grant Thornton's audits of Patisserie Valerie. The company entered liquidation after a major accounting shortfall, and the auditor later received a monetary sanction and the responsible audit partner received a temporary audit ban.
2021
Interserve audit investigation and sanction
Grant Thornton and an audit partner were fined following findings that the audits of Interserve did not demonstrate sufficient professional scepticism.
2021
Grant Thornton fined over Patisserie Valerie audits
The Financial Reporting Council fined Grant Thornton over its audits of Patisserie Valerie from 2015 to 2017, saying the audits missed red flags and failed to challenge the cafe chain's management. The regulator reduced the fine from £4 million to £2.34 million due to mitigating factors.
2020
FRC fines Grant Thornton over Conviviality audit
The Financial Reporting Council fined Grant Thornton £3 million, discounted to £1.95 million for admissions, over failures and loss of independence in its audits of Conviviality, the collapsed owner of Bargain Booze. The FRC said Grant Thornton admitted breaching ethical standards and audit-independence requirements.
2019
VEREIT shareholder litigation settlement
Grant Thornton settled claims brought by VEREIT stockholders concerning alleged violations of Section 11 of the United States Securities Act of 1933.
2019
Grant Thornton fined over audit
The Financial Reporting Council fined Grant Thornton £650,000 over its audit of an unnamed listed company in 2016. The article reports that Grant Thornton admitted the offences and that the fine was reduced to £422,500.
2018
Nichols and University of Salford audit misconduct
The Financial Reporting Council fined Grant Thornton UK over audit misconduct, including concerns involving a former partner's appointment to audit committees while the firm continued auditing the organizations.
Marketing campaigns
- 2019Diversity and inclusion employer positioning
Global
Grant Thornton placed in the top 50 of an employer diversity-and-inclusion index based on ratings from business and technology students.
Outcome. External recognition of the network's perceived commitment to diversity and inclusion.
- 1992Grant Thornton International Business Report
Global
The network began its recurring research program surveying privately held mid-market businesses across multiple economies.
Outcome. Established a continuing research and thought-leadership platform.
Brand decisions
2024
Appoint Malcolm Gomersall as chief executiveOtherBackground
David Dunckley stepped down as chief executive earlier in January.
Action taken
Grant Thornton announced Malcolm Gomersall as his successor.
Aftermath
The appointment began a new leadership period for the organization.
2024
Proposed majority investment in Grant Thornton UK by CinvenM&ABackground
Grant Thornton UK considered strategic alternatives, including a possible combination with its US sister firm, before selecting a private-equity transaction.
Action taken
Grant Thornton UK agreed to sell a majority stake to Cinven, subject to partner ratification and regulatory approvals.
Aftermath
The proposal represented a significant change in ownership structure for a major UK accounting firm, while Grant Thornton International remained a separate network entity.
Reported enterprise valuation. Approximately £1.3 billion (2024 announced transaction)
1986
Standardize the Grant Thornton brandStrategyBackground
The network needed a common identity after the formation of the international organization.
Action taken
Alexander Grant & Co. and Thornton Baker adopted the Grant Thornton name.
Aftermath
The shared name strengthened recognition across member firms while preserving their separate legal status.
1980
Create a global independent-firm networkStrategyBackground
Two established accounting firms and 49 other practices sought international reach while retaining national ownership and management.
Action taken
The firms formed the Grant Thornton international organization as a coordinated network rather than a single worldwide operating partnership.
Aftermath
The network model became the structural basis for Grant Thornton's international expansion.
Recent events
Reported
Grant Thornton fined over Patisserie Valerie audits[7]
The Financial Reporting Council fined Grant Thornton over its audits of Patisserie Valerie from 2015 to 2017, saying they missed red flags and failed to challenge the cafe chain’s management. The regulator reduced the fine from £4 million to £2.34 million due to mitigating factors.
Reported
Grant Thornton fined for audit independence failures[6]
The U.K. Financial Reporting Council fined Grant Thornton £1.95 million for firmwide ethical and independence failures concerning its audit of Conviviality Retail before the retailer collapsed in 2018. The fine was reduced from £3 million for admissions and early disposal.
- Unconfirmed
Reported
FRC fines Grant Thornton over Conviviality audit[5]
The Financial Reporting Council fined Grant Thornton £3 million, discounted to £1.95 million for admissions, over failures and loss of independence in its audits of Conviviality, the collapsed owner of Bargain Booze. The FRC said Grant Thornton admitted breaching ethical standards and audit-independence requirements.
Reported
BKD agrees to acquire part of Grant Thornton’s municipal audit practice[9]
BKD CPAs & Advisors announced an agreement to acquire part of Grant Thornton’s municipal government audit practice, mostly in Texas and Oklahoma, as well as a small number of other clients.
Reported
Grant Thornton fined over audit[8]
The Financial Reporting Council fined Grant Thornton £650,000 over its audit of an unnamed listed company in 2016. The article reports that Grant Thornton admitted the offences and that the fine was reduced to £422,500.
Sources11 sources
- 1Grant Thorntonen.wikipedia.org
- 2Grant Thornton Globalgrantthornton.global
- 3Grant Thornton International | Audit, Tax & advisory servicesgrantthornton.global
- 4https://www.grantthornton.globalgrantthornton.global
- 5FRC fines Grant Thornton over Conviviality audityorkshirepost.co.uk
- 6FRC fines Grant Thornton over Conviviality auditcomplianceweek.com
- 7Grant Thornton fined over Patisserie Valerie auditstheepochtimes.com
- 8Grant Thornton fined over auditstandard.co.uk
- 9BKD同意收购Grant Thornton部分市政审计业务prweb.com
- 10BKD acquires Texas-based municipal government audit practicefortworthbusiness.com
- 11Grant Thornton fined R47m for missing 'red flags' in UK audit work | News24news24.com
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