PwC (officially PricewaterhouseCoopers) is a global professional services firm headquartered in London, United Kingdom. It is the world's second-largest professional services firm (after Deloitte) and one of the "Big Four" accountancy firms.
It has offices in 757 cities across 151 countries and employs over 163,000 people. It had total revenues of $26 billion in 2009, of which $13 billion was generated by its Assurance practice, $7 billion by its Tax practice and $6 billion by its Advisory practice.
The firm was formed in 1998 by a merger between Price Waterhouse and Coopers & Lybrand. The trading name was shortened to PwC in September 2010 as part of a major rebranding exercise.
As of 2009 it was the eighth largest privately-owned organisation in the United States.