Deloitte vs McKinsey & Company
Side-by-side comparison of AI visibility scores, market position, and capabilities
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.
About
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.
New York global management consulting (founded 1926, private) at ~$16B 2024 revenue; 40% AI-related projects, QuantumBlack AI (350+ scientists), "State of AI 2025" thought leadership competing with BCG and Deloitte for C-suite AI strategy.
About
McKinsey & Company is a New York City-based global management consulting firm — privately held as a partnership — providing strategy, operations, technology, and organization consulting to CEOs and C-suites of the world's largest corporations, governments, and institutions through approximately 40,000 professionals across 130+ offices in 70+ countries and approximately $16 billion in estimated revenue in 2024. Founded in Chicago in 1926 by James O. McKinsey, a University of Chicago accounting professor, the firm's modern identity was shaped by Marvin Bower (who joined in 1933 and led the firm from 1950-1967, establishing the partnership model, professional ethics standards, and global expansion that define McKinsey today). Global Managing Partner Bob Sternfels (reelected to a second and final three-year term in February 2024) oversees the firm through a challenging period that includes reputation headwinds from its opioid consulting work and global scrutiny of consulting industry practices. McKinsey's service capabilities span traditional strategy consulting through McKinsey Digital (digital transformation, analytics), QuantumBlack (AI and machine learning, acquired 2015), and McKinsey Technology (CTO/CIO advisory, technology strategy) — with over 7,000 employees in digital and technology roles and approximately 40% of 2024 projects estimated to be AI-related. McKinsey's "State of AI in 2025" report found that organizations now mitigate an average of four AI-related risks (versus two in 2022) and that AI high performers (6% of survey respondents) attribute 5%+ EBIT improvement to AI, with AI agents increasingly deployed as virtual coworkers rather than passive research assistants.
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