Deloitte

Deloitte stands as the largest and most influential professional services network in the world, with a rich heritage dating back to 1845 when William Welch Deloitte opened his accounting office in London. At just 25 years old, Deloitte had a vision to build something that would last and bring change to the accounting industry and beyond. His groundbreaking appointment as the first independent auditor of a public company (Great Western Railway in 1849) helped establish the modern auditing profession.

Today's Deloitte is the product of multiple strategic mergers, most notably the 1989 merger of Ernst & Whinney with Arthur Young to create one of the Big Four accounting firms. With approximately 460,000 employees across over 150 countries and territories, Deloitte operates at a scale unmatched in the professional services industry. In fiscal year 2024, the firm generated $67.2 billion in aggregate global revenue, marking a 3.1% increase and cementing its position as the revenue leader among the Big Four.

Deloitte's integrated service model spans audit and assurance, consulting, tax and legal, risk advisory, and financial advisory services. The firm serves nearly 90% of the Fortune 500 and more than 8,500 U.S.-based private companies. Consulting is Deloitte's largest business segment, representing over 40% of total revenue, though all service lines experienced growth in 2024.

Under the leadership of Global CEO Joseph Ucuzoglu, who assumed the role in January 2023, Deloitte has made significant investments in artificial intelligence and digital transformation capabilities. The firm's expanded alliance with Anthropic and the launch of AI-powered tools like Scout demonstrate Deloitte's commitment to staying at the forefront of technological innovation. With its mission to be "The Standard of Excellence" and a culture built on trust, respect, fairness, and openness, Deloitte continues to attract top talent and deliver transformative value to clients worldwide.