Wikipedia: Ernst & Young (or EY) is one of the largest professional services firms in the world and one of the Big Four auditors, along with PricewaterhouseCoopers, Deloitte Touche Tohmatsu (Deloitte) and KPMG. According to Forbes magazine, as of 2007 it is also the 7th largest private company in United States. Ernst & Young is a global organization of member firms in more than 140 countries. Its global headquarters are based in London, UK and the U.S. firm is headquartered at 5 Times Square, New York, New York.