Big Four (accounting)

Big Four (accounting)
Name	Big Four (accounting)
Type	Informal designation
Industry	Professional services
Founded	1989 (modern configuration)
Headquarters	Global networks
Key people	See individual firm articles
Area served	Worldwide

Contents

Big Four (accounting) The Big Four are the four largest international professional services and accounting networks: Deloitte, PricewaterhouseCoopers, Ernst & Young, and KPMG. Originating from earlier firms like Arthur Andersen, Coopers & Lybrand, and Peat Marwick Mitchell, the group dominates audit, tax, advisory, and consulting engagements for multinational corporations such as General Electric, Alphabet Inc., Toyota Motor Corporation, Royal Dutch Shell, and Volkswagen. The firms maintain extensive presences in financial centers like New York City, London, Tokyo, Hong Kong, and Frankfurt am Main and engage with regulators including Securities and Exchange Commission, Financial Conduct Authority, and European Commission.

History and evolution

The origins trace to nineteenth-century firms such as Arthur Young, William Barclay Peat, Cooper Brothers, and Ernst & Ernst, which expanded through mergers exemplified by Peat Marwick Mitchell, Price Waterhouse, and Coopers & Lybrand. The 1987 and 1990s wave of mergers produced global networks including Deloitte Touche Tohmatsu, PricewaterhouseCoopers, and Ernst & Young Global Limited after combinations influenced by events like the Savings and Loan crisis and globalization trends tied to institutions such as International Monetary Fund, World Bank, and Organisation for Economic Co-operation and Development. The collapse of Arthur Andersen following the Enron scandal and litigation connected to WorldCom reshaped market concentration and regulatory responses from bodies like Public Company Accounting Oversight Board, Committee of European Auditing Oversight Bodies, and national regulators in Australia, Canada, and India.

The networks provide statutory audit and assurance services for clients such as Siemens, BMW, Samsung, BP plc, and Chevron Corporation; tax advisory alongside national authorities like Internal Revenue Service, Her Majesty's Revenue and Customs, and National Tax Service (South Korea); transaction advisory for mergers and acquisitions involving Blackstone Group, The Carlyle Group, Goldman Sachs, and Morgan Stanley; and consulting services used by Microsoft, IBM, Cisco Systems, and Oracle Corporation. Specialized practices include forensic accounting linked to cases like Lehman Brothers collapse, cybersecurity consulting addressing threats from groups such as Anonymous (group), and sustainability reporting aligning with frameworks by Task Force on Climate-related Financial Disclosures and United Nations Global Compact.

Collectively the firms audit the majority of Fortune 500 and FTSE 100 companies, and compete with regional firms including BDO International, Grant Thornton International, RSM International, and national networks like Mazars and Crowe Global. Market share metrics are monitored by bodies including PCAOB and European Securities and Markets Authority and are influenced by consolidation events involving firms such as Baker Tilly International and Nexia International. Competitive dynamics respond to antitrust scrutiny from agencies like United States Department of Justice, European Commission Directorate-General for Competition, and Competition and Markets Authority.

The firms have been subject to high-profile controversies including audit failures tied to Enron, WorldCom, Lehman Brothers, and Carillion that provoked inquiries by parliamentary committees in United Kingdom, congressional investigations in United States, and probes by regulators in Australia and Canada. Criticisms cover perceived conflicts of interest arising from provision of consulting services to audit clients, regulatory responses such as mandatory audit firm rotation debated by European Commission and recommendations from King Committee on Corporate Governance in South Africa, and legal actions in jurisdictions including Netherlands and Japan. Ethics and independence debates reference professional bodies like International Federation of Accountants, American Institute of Certified Public Accountants, and case law including rulings by the Supreme Court of the United States.

The concentration of audit capacity affects capital markets in centers such as New York Stock Exchange, London Stock Exchange, and Tokyo Stock Exchange and raises systemic considerations for financial stability overseen by institutions including International Monetary Fund and Bank for International Settlements. The firms’ advisory work shapes dealmaking in sectors dominated by firms like Alphabet Inc. and Berkshire Hathaway and influences corporate governance practices adopted by boards at General Motors, Meta Platforms, Inc., and Procter & Gamble. Policy proposals for market structure reform have been advanced by regulators including Financial Stability Board and academics at institutions such as Harvard University, University of Oxford, and London School of Economics.

Category:Accounting firms