The Big Four are the four largest professional services networks in the world: Deloitte, 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 British multinational professional services partnership based in London, England. 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.
Deloitte Touche Tohmatsu Limited, commonly referred to as Deloitte, is a British multinational professional services network based in London, England. Deloitte is the largest professional services network by revenue and number of employees in the world and is considered one of the Big Four accounting firms, along with EY, KPMG, and PwC.
The Institute of Chartered Accountants in England and Wales (ICAEW) is a professional membership organisation that promotes, develops and supports chartered accountants and students around the world. As of December 2023, it has over 208,000 members and students in 146 countries. ICAEW was established by royal charter in 1880.
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 seventh 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.
Founded in 1904, the Association of Chartered Certified Accountants (ACCA) is the global professional accounting body offering the Chartered Certified Accountant qualification (ACCA). It is the fourth-largest professional accounting body in the world, with 252,500 members and 526,000 future members. ACCA's headquarters are in London with principal administrative office in Glasgow. ACCA works through a network of over 110 offices and centres in 51 countries - with 346 Approved Learning Partners (ALP) and more than 7,600 Approved Employers worldwide, who provide employee development.
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. RSM US has been ranked as the 7th most prestigious accounting firm in the US as voted on by accounting professionals. It employs more than 16,800 professionals across 81 cities nationwide and in Canada. RSM US also maintains offices in India and El Salvador.
Smith & Williamson was a United Kingdom financial and professional services firm. It was acquired by wealth manager, Tilney, in 2019 and the enlarged firm was rebranded as Evelyn Partners in 2022.
RSM Tenon was a professional services firm based in the United Kingdom, which was listed on the FTSE SmallCap Index and part of RSM Global. The company was formed from the merger of the Tenon Group with RSM Bentley Jennison in December 2009.
Forvis 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. Mazars merged with Forvis to officially become Forvis Mazars as of June 1, 2024.
Vantis plc was an accountancy firm based in London, England, providing accounting, tax and business advice to owner-managed businesses, listed companies, not for profit organisations, high-net-worth individuals and other professionals. It was placed in administration on 29 June 2010 and promptly broken up, with the various offices and businesses being sold as going concerns.
The Accounting and Corporate Regulatory Authority (ACRA) is a statutory board under the Ministry of Finance of the Government of Singapore. ACRA is the regulator of business registration, financial reporting, public accountants and corporate service providers. ACRA is also responsible for developing the accountancy sector and setting the accounting standards for companies, charities co-operative societies, and societies in Singapore.
Moore Kingston Smith founded in 1923 is an accountancy firm located in the United Kingdom. The firm has six offices in London and the south-east and is the London member of the Moore Global Network. In 2022, the Moore UK network ranked 11th on Accountancy Age magazine's "UK Top 50 Accountancy Firms" list.
Leonard Curtis is one of the largest independent firms in the UK specialising in corporate recovery, insolvency and business restructuring.
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.
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.
Moore Global is a global accountancy, advisory and consulting network of independent firms with its headquarters in London. Moore Global is ranked by the International Accounting Bulletin (IAB) as the 11th largest accountancy network in the world. The Moore Global Network consists of over 34,413 people across 112 countries.
Baker Tilly International is a consulting and public accounting firm. It is currently the 10th largest accounting network in the world by revenue with 43,000 people in 700 offices across 141 territories with combined global revenues of US$5.2 billion. Baker Tilly operates geographically through four regions: Asia Pacific; Europe, Middle East and Africa; Latin America; and North America. Each region has a chair, appointed by the International Board, who leads an advisory council elected by members in that region.
Saffery is a firm of chartered accountants in the United Kingdom. It has nine offices across the UK as well as offshore. The firm acts for clients across a variety of sectors and provides accountancy, audit and assurance, personal and corporate tax, and corporate finance services.
BDO is an international network of public accounting, tax, consulting and business advisory firms that provide professional services under the name BDO. It is the fifth-largest accounting network in the world. Global fee income of the member firms in the network for the year ended 30 September 2023, including the members of their exclusive alliances, totaled US$ 14 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).
Uk£52.1 million (2018)