Deloitte Touche Tohmatsu Limited, commonly referred to as Deloitte, is a multinational professional services network based in London, England. Deloitte is the largest professional services network by revenue and number of employees in the world and is one of the Big Four accounting firms, along with EY, KPMG, and PwC. Deloitte provides audit, consulting, financial advisory, risk advisory, tax, and legal services with approximately 457,000 employees globally, and operates in over 150 countries. In FY 2023, the network earned revenues of US$64.9 billion in aggregate.^[4] The firm has sponsored a number of activities and events including the 2012 Summer Olympics.