Deloitte

Deloitte is a multinational professional services network based in London, England. It is the largest professional services network in the world by revenue and number of employees, and is one of the Big Four accounting firms, along with EY, KPMG, and PwC. The Deloitte network is composed of member firms of Deloitte Touche Tohmatsu Limited ( də-LOYT TOOSH TOH-maht-soo), a private company limited by guarantee incorporated in England and Wales. The firm was founded by the accountant William Welch Deloitte in London, England in 1845 and expanded into the United States in 1890. It merged with Haskins & Sells to form Deloitte Haskins & Sells in 1952 and with Touche Ross in the US to form Deloitte & Touche in 1989. In 1993, the international firm was renamed Deloitte Touché Tohmatsu, later abbreviated to Deloitte. In 2002, Arthur Andersen's practice in the UK as well as several of that firm's practices in Europe and North and South America agreed to merge with Deloitte. Subsequent acquisitions have included Monitor Group, a large strategy consulting business, in 2013. Deloitte provides audit, consulting, financial advisory, risk, tax, and legal services with approximately 470,000 employees globally, and operates in over 150 countries. In FY 2024, the network earned revenues of US$67.2 billion in aggregate. The firm has sponsored a number of activities and events, including the 2012 Summer Olympics. The firm suffered a major cyberattack in 2017, causing a breach in client confidentiality and publicizing a significant amount of employee information. Deloitte has also been subject to litigation regarding several of its audits. In 2023, Deloitte was the fourth-largest privately owned organization in the United States, and has been continuously ranked on Fortune magazine's list of the 100 Best Companies to Work For.