Arthur Andersen was an American accounting firm based in Chicago that provided auditing, tax advising, consulting and other professional services to large corporations. By 2001, it had become one of the world's largest multinational corporations and was one of the "Big Five" accounting firms. The firm collapsed by mid-2002, as details of its questionable accounting practices for energy company Enron and telecommunications company WorldCom were revealed amid the two high-profile bankruptcies. The scandals were a factor in the enactment of the Sarbanes–Oxley Act of 2002.
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, information technology services, 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.
PricewaterhouseCoopers International Limited is a multinational professional services brand of firms, operating as partnerships under the PwC brand. It is the second-largest professional services network in the world and is considered one of the Big Four accounting firms, along with Deloitte, EY and KPMG.
Protiviti Inc. (Protiviti) is a global consulting firm headquartered in Menlo Park and San Ramon, California, that provides consulting in internal audit, risk and compliance, technology, business processes, data analytics and finance. It is a subsidiary under Robert Half. Protiviti and its independently and locally owned Member Firms serve clients through a network of more than 85 locations in over 27 countries.
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.
BDO USA, P.A. is the United States member firm of BDO International, a global accounting network. The company is headquartered in Chicago. The firm adopted its current moniker in 1973, each letter corresponding to a surname of an original founder of the corporation: Binder, Dijker, and Otte.
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.
The accountancy profession in Malaysia is regulated by the Malaysian Institute of Accountants (MIA) through the powers conferred by the Accountants Act, 1967. The MIA is an agency under the Ministry of Finance and reports directly to the Accountant General Office. As at 4 February 2016, MIA has 32,618 members of which 68% are involved in commerce and industry, 22% in public practice and 10% in government and academia. Selangor and the Wilayah Persekutuan Kuala Lumpur Federal Territory have the largest concentration of MIA membership with 13,125 and 7,351 members respectively. https://web.archive.org/web/20150725035639/http://www.mia.org.my/new/members_statistics_state.asp
FORVIS ranks among the U.S. top 10 public accounting firms, providing assurance, tax, and consulting services.
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.
Bain & Company is an American management consulting company headquartered in Boston, Massachusetts. The firm provides advice to public, private, and non-profit organizations. One of the Big Three management consultancies, Bain & Company was founded in 1973 by former Group Vice President of Boston Consulting Group Bill Bain and his colleagues, including Patrick F. Graham. In the late 1970s and early 1980s, the firm grew rapidly. Bill Bain later spun off the alternative investment business into Bain Capital in 1984 and appointed Mitt Romney as its first CEO. Bain experienced several setbacks and financial troubles from 1987 to the early 1990s. Romney and Orit Gadiesh are credited with returning the firm to profitability and growth in their sequential roles as the firm's CEO and chairman respectively.
An accounting network or accounting association is a professional services network whose principal purpose is to provide members resources to assist the clients around the world and hence reduce the uncertainty by bringing together a greater number of resources to work on a problem. The networks and associations operate independently of the independent members. The largest accounting networks are known as the Big Four.
Multidisciplinary professional services networks are organizations formed by law, accounting and other professional services firms to offer clients new multidisciplinary approaches solving increasingly complex issues. They are a type of professional services network which operates to provide services to their members. They operate in the same way as accounting firm networks and associations and law firm networks. They do not practice a profession such as law or accounting but provide services to members so they can serve clients needs. Their aim is to provide members involved in doing business internationally with access to experienced, tried and tested, reliable, and responsive professional advisers who know their local jurisdiction intimately as well as the intricacies of cross border business.
Baker Tilly International is a consulting and public accounting firm. It is currently the 9th largest accounting network in the world by revenue with 41,000 people in 700 offices across 145 territories with combined global revenues of $4.7bn. Baker Tilly International operates geographically through four regions: Asia Pacific; Europe, Middle East and Africa; Latin America; and North America. Each region has a chair, appointed by the International Board, who leads an advisory council elected by members in that region.
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).
US$4.9 billion (2022) [1] 
