Deloitte Touche Tohmatsu Limited (pron.: /d??l??t/), commonly referred to as Deloitte, is one of the Big Four professional services firms along with PricewaterhouseCoopers (PwC), Ernst & Young, and KPMG. Deloitte is the second largest professional services network in the world by revenue and has 193,000 employees in more than 150 countries providing audit, tax, consulting, enterprise risk and financial advisory services. In FY 2012, Deloitte earned a record $31.3 billion USD in revenues. In 2012, it was reported that in the UK Deloitte has the largest number of clients amongst FTSE 250 companies. Its global headquarters is located in New York City, United States.
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Tata Consultancy Services Limited (TCS) (BSE: 532540, NSE: TCS) is an Indian multinational information technology (IT) services, business solutions and consulting company headquartered in Mumbai, Maharashtra. TCS is a subsidiary of the Tata Group and is listed on the Bombay Stock Exchange and the National Stock Exchange of India. It is one of Indias most valuable companies and is the largest India-based IT services company by 2012 revenues.
McKinsey & Company, Inc. is an American global management consulting firm that focuses on solving issues of concern to senior management. McKinsey serves as an adviser to businesses, governments, and institutions around the world.
Cognizant Technology Solutions Corp. is an American multinational provider of custom information technology, consulting and business process outsourcing services. It is headquartered in Teaneck, New Jersey, USA. Cognizant is included in the NASDAQ-100 and the S&P 500 indices. Originally founded as an in-house technology unit of Dun & Bradstreet in 1994, Cognizant started serving external clients in 1996. Cognizants IPO was launched in 1998, after a series of corporate splits and restructures of its parent companies. During the dot com bust, it grew by accepting the application maintenance work that the bigger players were unwilling to perform. Gradually, it ventured into application development, complex systems integration and consulting work. Cognizant saw a period of fast growth during the 2000s, becoming a Fortune 500 company in 2011. In 2011, the Fortune magazine named it as the worlds third most admired IT services company after Accenture and IBM.