PricewaterhouseCoopers (trading as PwC) is a multinational professional services firm headquartered in London, United Kingdom. It is the world's largest professional services firm and the largest of the "Big Four" accountancy firms measured by 2012 revenues.
PwC has offices in 776 cities across 159 countries and employs over 180,000 people. It had total revenues of $31.5 billion in FY 2012, of which $14.9 billion was generated by its Assurance practice, $7.9 billion by its Tax practice and $8.7 billion by its Advisory practice.
The firm was formed in 1998 by a merger between Coopers & Lybrand and Price Waterhouse. The trading name was shortened to PwC in September 2010 as part of a major rebranding exercise.
As of 2012 PwC United States is the fifth-largest privately owned organization in the United States. [Source: Wikipedia]