Ernst & Young (re-branded as EY) is a multinational professional services firm headquartered in London, 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" accounting firms Read more › Ernst & Young (re-branded as EY) is a multinational professional services firm headquartered in London, 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" accounting firms Read more ›