Who Owns McKinsey & Company?

James O. McKinsey, a University of Chicago accounting professor, founded the firm in Chicago in 1926 to sell financial and budgeting advice to corporate management. He believed accountants should advise on running businesses, not just audit them, an idea that effectively created the management consulting industry.

Marvin Bower, who joined in 1933 and led the firm for decades after McKinsey's 1937 death, defined its modern character: professional standards modeled on law firms, an up-or-out career pyramid, confidential client relationships, and the mission of advising top management rather than doing implementation. Under Bower the firm spread internationally from the 1950s, opening in London, Paris, and beyond as American corporations globalized.

McKinsey alumni became a management diaspora, populating CEO offices across the Fortune 500 and reinforcing the firm's recruiting and prestige. Through the late twentieth century it remained the most prestigious of the strategy consultancies, joined by Boston Consulting Group (1963) and Bain & Company (1973) in what became known as the MBB tier.

The firm modernized its model in the 2000s and 2010s, expanding beyond boardroom strategy into implementation, digital, analytics, and design through units like McKinsey Digital and acquisitions including design firm LUNAR and advanced-analytics specialists. It also faced its worst reputational period: the Rajat Gupta insider trading scandal of 2011 and the opioid litigation that culminated in settlements totaling about $1.6 billion, including a 2024 deferred prosecution resolution of roughly $650 million with US authorities over its Purdue Pharma work.

In its centenary year of 2026, McKinsey is restructuring around AI delivery while managing a post-pandemic demand slowdown. Revenue has hovered near $16 billion for several years, and the firm cut more than 10 percent of staff between 2023 and 2025 while continuing to hire consultants at scale.