The Big Four are the four largest professional services networks in the world: Deloitte, Ernst & Young (EY), KPMG, and PwC. They are the four largest global accounting networks as measured by revenue. The four are often grouped because they are comparable in size relative to the rest of the market, both in terms of revenue and workforce; they are considered equal in their ability to provide a wide scope of professional services to their clients; and, among those looking to start a career in professional services, particularly accounting, they are considered equally attractive networks to work in, because of the frequency with which these firms engage with Fortune 500 companies.
Ernst & Young Global Limited, trade name EY, is a multinational professional services partnership. EY is one of the largest professional services networks in the world. Along with Deloitte, KPMG and PwC, it is considered one of the Big Four accounting firms. It primarily provides assurance, tax, consulting and advisory services to its clients.
KPMG International Limited is a multinational professional services network, and one of the Big Four accounting organizations, along with Ernst & Young (EY), Deloitte, and PwC. The name "KPMG" stands for "Klynveld Peat Marwick Goerdeler". The initialism was chosen when KMG merged with Peat Marwick in 1987.
Deloitte Touche Tohmatsu Limited, commonly referred to as Deloitte, is a multinational professional services network. Deloitte is the largest professional services network by revenue and number of professionals in the world and is considered one of the Big Four accounting firms along with EY, KPMG and PwC.
Grant Thornton LLP is the American member firm of Grant Thornton International, the seventh largest accounting network in the world by combined fee income. Grant Thornton LLP is the sixth largest U.S. accounting and advisory organization. The firm operates 59 offices across the US with approximately 8,500 employees, 550 partners, and produces annual revenue in excess of US$1.9 billion.
RSM US LLP is an audit, tax, and consulting firm focused on the middle market in the United States and Canada and is a member of the global accounting network RSM International. It is the fifth largest accounting firm in the United States and employs more than 17,000 professionals across 93 cities nationwide and in Canada. RSM US also maintains offices in India and El Salvador. Since 2012, RSM US has been headquartered in downtown Chicago.
Moss Adams LLP is one of the 15 largest public accounting firms in the United States and provides accounting, tax and consulting services to public and private middle-market enterprises in many different industries.
Mazars is an internationally integrated partnership, specialising in audit, accounting and consulting group employing more than 47,000 professionals in more than 95 countries through member firms. With head offices in Paris, France, Mazars has a network of correspondent partners and joint ventures in a further 21 countries and is a founding member of the Praxity alliance, a network of independent firms.
Grant Thornton is the world's seventh-largest by revenue and sixth-largest by number of employees professional services network of independent accounting and consulting member firms which provide assurance, tax and advisory services to privately held businesses, public interest entities, and public sector entities. Grant Thornton International Ltd. is a not-for-profit, non-practising, international umbrella membership entity organised as a private company limited by guarantee. Grant Thornton International Ltd. is incorporated in London, England, and has no share capital.
FORVIS ranks among the U.S. top 10 public accounting firms, providing assurance, tax, and consulting services.
CliftonLarsonAllen LLP is a professional services firm and the eighth-largest accountancy firm in the United States. It was established in 2012 with the merger of two U.S. firms: Clifton Gunderson LLP and LarsonAllen LLP. It is a member of CLA Global accounting network.
HLB International is a global network of independent advisory and accounting firms, comprising member firms in 157 countries. HLB International member firms offer audit, accounting, tax and business advisory services.
Eide Bailly LLP is a Trans-Mississippi American mid-tier public accounting and ancillary professional services firm headquartered in Fargo, North Dakota, although incorporated in Minnesota. It primarily provides tax services, assurance, consulting and advisory services to its clients and is a member firm of HLB International, an accounting network.
MNP is one of the largest full-service chartered professional accountancy and business advisory firms in Canada. MNP's head office is in Calgary, Alberta, and has offices from Vancouver Island to St. John's. MNP's 128 offices span across 9 out of 13 of the provinces and territories of Canada, as it does not have locations in Prince Edward Island, Yukon, Northwest Territories, and Nunavut. With 8,000+ employees, MNP is the third largest professional service firms in Canada by headcount.
Mitchell & Titus, LLP is an independent member firm of BDO Alliance USA and the largest accounting firm in the United States owned by a minority social group. Headquartered in New York City, the company provides professional services in assurance, tax, and advisory to Fortune 1000 companies, entrepreneurial enterprises, not-for-profit organizations, financial services firms, government entities, and high-net-worth individuals. Mitchell & Titus maintains six offices across six states in New York, New Jersey, Pennsylvania, Maryland, District of Columbia, and Illinois.
Plante Moran is the 16th largest audit, accounting, tax, consulting, investment banking, and wealth management firm in the United States according to Inside Public Accounting's 2019 list of the “Top 100” firms. Plante Moran, headquartered in Southfield, Michigan, employs more than 3,000 people and has 27 offices through Michigan, Ohio, Illinois, Colorado, and in Mexico, India, Japan and China.
Bennett Thrasher LLP is a certified public accounting and consulting firm headquartered in Atlanta, Georgia that provides tax, audit, advisory and business process outsourcing services to businesses and high net worth individuals. The firm has 51 partners and more than 350 professionals, and is affiliated with BT Wealth Management, LLC and BT Family Office. Bennett Thrasher is also a member of Leading Edge Alliance and DFK International, which are worldwide associations of independent accounting and consulting firms.
Aprio, LLP is an accounting and business advisory firm headquartered in Atlanta, Georgia. Aprio is the fastest-growing firm in the United States, ranking 26th on the Top 100 Firms list published by Accounting Today, as well as the largest firm headquartered in the Southeastern United States and a top tax firm. Georgia judge Amy Totenberg, who is overseeing a case against alleged promoters of syndicated conservation easements indicated she sees a 'consistent pattern' across transactions that form the basis of the class-action lawsuit against Aprio.
BDO is an international network of public accounting, tax, consulting and business advisory firms that provide professional services under the name BDO. It is the fifth-largest accounting network in the world. Global fee income of the member firms in the network for the year ended 30 September 2021, including the members of their exclusive alliances, totaled US$12.8 billion. Each BDO member firm is an independent legal entity in its own country. The network, founded in 1963 as Binder Seidman International Group by firms from Canada, Germany, the Netherlands, the UK and the US, is coordinated by BDO Global Coordination B.V., with an office in Zaventem, Belgium. In 1973, the organisation adopted the name BDO, made up from the initials of the three founding firms: Binder (UK), Dijker (Netherlands) and Otte (Germany).
