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The Big Four or top 4 international accounting firms or audit firms are the ones which handle majority of audits of private companies and publicly traded companies world wide. The following is the list of top four accounting firms or top 4 audit firms. None of the top Four accounting firms is a single firm. Each is a network of firms, owned and managed independently, which have entered into agreements with other member firms in the network to share a common name, brand and quality standards. The list is as follows,

1). PricewaterhouseCoopers
PricewaterhouseCoopers is one of the world's largest professional services firms and the largest of the Big 4 auditing firms in the world. It was formed in the year 1998 from a merger between Price Waterhouse and Coopers & Lybrand, both formed in London. PricewaterhouseCoopers employed over 163,000 staff in 151 countries.

2). Deloitte Touche Tohmatsu
Deloitte Touche Tohmatsu, famously known as Deloitte is one of the largest professional audit services organizations. Its global headquarters is located in Paramount Plaza, Midtown Manhattan, New York City, New York. Deloitte has approximately 165,000 workers at work in around 140 countries.

3). Ernst & Young
Ernst & Young is also one of the largest professional audit services firms in the world which is a global organization of member firms in more than 140 countries. Its global headquarters are based in London, UK.

4). KPMG
KPMG is one among the top 4 of the largest professional services firms in the world. Its global headquarters is located in Amstelveen, Netherlands. KPMG employs over 135,000 people in a global network of professional services firms spanning over 140 countries.