# Deloitte **Source:** https://geo.sig.ai/brands/deloitte **Vertical:** Professional Services **Subcategory:** General **Tier:** Leader **Website:** deloitte.com **Last Updated:** 2026-04-14 ## Summary London global professional services (largest Big 4) at $70.5B FY2025 revenue (+4.8%); Anthropic strategic alliance with Scout AI tool and 460,000 employees serving 90% Fortune 500 competing with PwC and Accenture for consulting and audit mandates. ## Company Overview Deloitte Touche Tohmatsu Limited (DTTL) is a London, England-headquartered global professional services network — operating as the world's largest professional services firm by revenue, reporting $70.5 billion in aggregate global revenue for fiscal year 2025 (ended May 31, 2025, +4.8% in local currency) with approximately 460,000 employees across 150+ countries — providing audit and assurance, consulting, tax and legal, risk advisory, and financial advisory services to nearly 90% of the Fortune 500 and 8,500+ US private companies. Consulting represents 40%+ of total revenue as Deloitte's largest service line. Global CEO Joseph Ucuzoglu has led the firm since January 2023. Key AI initiatives include the strategic alliance with Anthropic (using Claude for client engagements and internal operations), the Scout AI research tool for client strategy engagements, and $2+ billion in AI capability investment. Founded with roots to 1845 when William Welch Deloitte opened his London accounting office; modern Deloitte formed through the 1989 merger of Deloitte Haskins & Sells with Touche Ross. Deloitte's professional services network model addresses the integrated advisory needs of global enterprises that require audit credibility, tax optimization, and transformation consulting from a partner with both global scale and local country expertise: multinational corporations require audit firms that can coordinate work across 50+ country subsidiaries with a single integrated opinion — demanding the global coordination infrastructure and methodology standardization that only the Big Four have built. For consulting, Deloitte's scale (the largest consulting practice by revenue) enables simultaneous deployment of 500-2,000 consultants on multi-year technology transformation programs (ERP implementations, cloud migrations, AI deployment) that specialized boutiques cannot staff. The Anthropic alliance differentiates Deloitte's AI consulting practice — offering clients the same Claude models that Deloitte uses internally for engagement delivery, with the firm's implementation expertise layered on top of Anthropic's model capabilities. In 2025, Deloitte competes in the global audit, consulting, tax, and advisory professional services market with McKinsey & Company (management consulting, $16B+ estimated), PwC ($56.9B FY2025 revenue), and Accenture (NYSE: ACN, technology services, $65B+ revenue) for Fortune 500 audit mandates, digital transformation consulting engagements, and AI strategy advisory mandates. The $70.5 billion FY2025 revenue maintains Deloitte's position as the largest Big Four firm by revenue — ahead of PwC ($56.9B), EY ($49.4B), and KPMG ($36.4B). The Anthropic partnership (one of a small number of enterprise-scale Claude deployments) creates AI advisory differentiation and the scout AI tool demonstrates internal deployment of GenAI for research and analysis. The 2025 strategy focuses on growing the AI transformation advisory practice (helping clients develop AI governance frameworks and enterprise AI deployment roadmaps), expanding the Deloitte AI Institute research output, and defending large public company audit mandates against PCAOB rotation requirements and audit quality scrutiny. ## Frequently Asked Questions ### What is Deloitte? Deloitte is the world's largest professional services network by revenue and employees, providing audit, consulting, tax, and advisory services to nearly 90% of the Fortune 500. Founded in 1845 in London, Deloitte operates in over 150 countries with approximately 460,000 employees and $67.2 billion in revenue (FY2024). ### Who are Deloitte's customers and target market? Deloitte serves nearly 90% of the Fortune 500 companies and more than 8,500 U.S.-based private companies. The firm's clients span all industries and sectors, including corporations, governments, nonprofits, and organizations of all sizes seeking audit, consulting, tax, and advisory services. ### When was Deloitte founded? Deloitte was founded on April 23, 1845, by William Welch Deloitte in London, England. The firm celebrated its 175th anniversary in 2020, making it one of the oldest and most established professional services organizations in the world. ### Where is Deloitte based? Deloitte was founded in London, England, and maintains a global presence with operations in over 150 countries and territories. The firm operates through a network of member firms, with Deloitte Touche Tohmatsu Limited serving as the coordinating entity. ### What is Deloitte's revenue and size? Deloitte reported $67.2 billion in aggregate global revenue for fiscal year 2024 (ending May 31), a 3.1% increase from the prior year. With approximately 460,000 employees worldwide, Deloitte is the largest of the Big Four accounting firms by both revenue and headcount. ### What makes Deloitte different from competitors? Deloitte differentiates through its unmatched global scale as the largest Big Four firm, comprehensive service portfolio spanning audit, consulting, tax and advisory, industry-leading AI capabilities through partnerships with Anthropic and AWS, and a culture of belonging and collaboration. The firm has been on Fortune's 100 Best Companies to Work For list for 25 consecutive years. ### Who are Deloitte's main competitors? Deloitte's main competitors are the other Big Four professional services firms: PwC, EY, and KPMG. In strategy consulting, Deloitte also competes with McKinsey & Company, Boston Consulting Group, and Bain & Company. Among the Big Four, Deloitte is the largest by revenue and employees. ### How can I contact Deloitte? You can contact Deloitte through their global website at www.deloitte.com or reach out to local member firms in over 150 countries. For career opportunities, visit the Deloitte careers portal specific to your region. ### Is Deloitte hiring? Yes, Deloitte actively recruits talent globally and grew its workforce by 3.5% year-over-year to over 450,000 employees in FY2024. The firm offers comprehensive benefits, professional development, hybrid work options, and has been recognized on Fortune's 100 Best Companies to Work For list for 25 consecutive years. ### What's the latest news about Deloitte? In fiscal year 2025, Deloitte reported record revenue of $70.5 billion (4.8% growth). The firm expanded its Anthropic partnership to provide Claude AI across its global network, launched Scout AI-driven learning assistant, and was recognized as a Leader in the 2025 Gartner Magic Quadrant for Finance & Accounting BPO. ### What is Deloitte's market position? Deloitte is the #1 ranked Big Four firm by revenue ($67.2B in FY2024) and employees (460,000+). The firm serves nearly 90% of the Fortune 500 and maintains the largest market share among professional services firms globally. Consulting is the highest-earning service line at over 40% of revenue. ### What are Deloitte's future plans? Deloitte is investing heavily in AI and digital transformation, including its expanded Anthropic partnership and AI-powered tools. The firm continues to enhance its global integration, expand client-centric services, and develop its people through comprehensive learning programs. Under CEO Joe Ucuzoglu's leadership, Deloitte aims to maintain its position as the Standard of Excellence. ## Tags b2b, enterprise, fortune500, global, services, saas --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*