Ernst & Young LLP (commonly referred to as EY) is a multinational professional services firm headquartered in London, England, United Kingdom.
It was the third largest professional services firm in the world by aggregated revenue in 2012 and is one of the "Big Four" audit firms.
The company has offices in 150 countries with more than 233,000 employees operating out of 787 offices across 140 countries worldwide.
EY operates as an independent company that provides assurance, tax and advisory services to organizations around the world.
As of 2008, it had 821 partners and over 26,000 employees working in 43 countries, serving many of the world's largest companies.