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Deloitte Touche Tohmatsu Limited /dəˈlɔɪt ˈtʃ tˈmɑːts/, commonly referred to as Deloitte, is a multinational professional services network.Deloitte Touche Tohmatsu Limited /dəˈlɔɪt ˈtʃ tˈmɑːts/, commonly referred to as Deloitte, is a multinational professional services network.[7] Deloitte is one of the Big Four accounting organizations and the largest professional services network in the world by revenue and number of professionals, with headquarters in London, United Kingdom.[8]

The firm was founded by William Welch Deloitte in London in 1845 and expanded into the United States in 1890.[9] It merged with Haskins & Sells to form Deloitte Haskins & Sells in 1972 and with Touche Ross in the US to form Deloitte & Touche in 1989. In 1993, the international firm was renamed Deloitte Touche Tohmatsu, later abbreviated to Deloitte.[9] 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.[10] Subsequent acquisitions have included Monitor Group, a large strategy consulting business, in January 2013.[11] The international firm is a UK private company, limited by guarantee, supported by a network of independent legal entities.[12]

Deloitte provides audit, consulting, financial advisory, risk advisory, tax and legal services with approximately 312,000 professionals globally.[13] In FY 2020, the network earned a record US$47.6 billion in aggregate revenues.[5] As of 2019, Deloitte is the 4th-largest privately owned company in the United States.[14] The firm has sponsored a number of activities and events including the 2012 Summer Olympics.[15]

Controversies involving the firm, in addition to litigation surrounding a few of its audits, have included its involvement in a "potentially misleading" report on illicit tobacco trading in Australia,[16] the fact that it suffered a major cyber-attack which breached client confidentiality as well as exposing extensive employee information in September 2017,[17] its role as internal auditor of the insolvent contractor Carillion[18] and its role as external auditor of Autonomy which was accused of "accounting improprieties" that contributed to an £8.8 billion write-down of value following its acquisition by Hewlett-Packard in 2011.[19]