Deloitte Touche Tohmatsu Limited, or Deloitte, is a multinational professional services network with offices in more than 150 countries and territories worldwide. Deloitte, headquartered in London, England, is one of the Big Four accounting firms and the world's biggest professional services network in terms of revenue and number of employees.

William Welch Deloitte founded the companies in London in 1845, and it extended to the United States in 1890. With over 334,800 experts worldwide, Deloitte provides audit, consulting, financial advice, risk advisory, tax, and legal services. According to Forbes, Deloitte is the third-largest privately held corporation in the United States as of 2020.

Deloitte member firms offer services such as:

• Audit
• Consulting
• Financial advisory
• Risk advisory
• Tax and legal
• GovLab
  

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Revenue: $47.6 billion

Website: https://www2.deloitte.com/us/en.html

Facebook: https://www.facebook.com/deloitte/

PwC is an international professional services network of organizations that operate as partnerships under the PwC brand. PwC is the world's second-largest professional services network and one of the Big Four accounting companies, together with Deloitte, EY, and KPMG.

PwC companies employ 284,000 individuals in 157 countries and 742 locations. The current version of the firm was formed in 1998 by the merging of two accounting firms: Coopers & Lybrand and Price Waterhouse. Both enterprises had histories that dated back to the nineteenth century. As part of a rebranding exercise, the trading name was abbreviated to PwC.

PricewaterhouseCoopers International Limited, headquartered in London, England, serves as the worldwide network's coordinating entity. It oversees the worldwide brand and develops policies and programs to promote a unified and coordinated approach to risk, quality, and strategy.

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Revenue: $43.0 billion
Website: https://www.pwc.com/
Facebook: https://www.facebook.com/PwC

EY, or Ernst & Young Global Limited, is a worldwide professional services network headquartered in London, England. EY is one of the world's leading professional services networks. It is one of the Big Four accounting companies, along with Deloitte, KPMG, and PricewaterhouseCoopers.

EY primarily serves its clients with assurance (including financial audit), tax, consultancy, and advising services. In recent years, EY, like many of the bigger accounting firms, has expanded into sectors other than accounting, such as strategy, operations, human resources, technology, and financial services consulting.

EY operates as a network of member companies established as separate legal entities in a partnership, with 312,250 workers in over 700 offices in more than 150 countries. The present partnership of the business was founded in 1989 by the merging of two accounting companies, Ernst & Whiney and Arthur Young & Co. It was known as Ernst & Young until a rebranding drive in 2013 officially changed the name to EY. However, this initialism had previously been used informally before its regulatory acceptance.

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Revenue: $37.2 billion
Website: https://www.ey.com/
Facebook: https://www.facebook.com/EY/

KPMG International Limited (or simply KPMG) is a worldwide professional services network based in the United Kingdom and the Netherlands that is one of the Big Four accountancy firms.

KPMG is a network of companies in 145 countries with over 236,000 employees and three lines of service: financial audit, tax, and advisory. It is headquartered in Amstelveen, Netherlands, but is incorporated in the United Kingdom. It further divides its tax and advising services into numerous service categories. Various segments of the firm's global network of affiliates have been embroiled in regulatory proceedings as well as litigation during the last decade.

Each national KPMG company is a separate legal entity that is a member of KPMG International Limited, a UK Limited Company based in London, United Kingdom. This structure, in which the Limited business exclusively offers support services to member firms, is similar to that of other professional services networks.

KPMG is organized into three service lines:

• Audit
• Advisory
• Tax

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Revenue: $29.75 billion
Website: https://home.kpmg/xx/en/home.html
Facebook: https://www.facebook.com/KPMG

BDO is a multinational network of public accounting, tax, consulting, and business advice businesses that operate under the BDO brand. BDO includes member companies in 167 countries, employs around 91,000 partners and staff in over 1,658 locations worldwide, and is the world's fifth-biggest accounting network as of 2020.

Each BDO member firm operates as a separate legal entity in its nation. BDO Global Coordination B.V., with an office in Zaventem, Belgium, coordinates the network, which was founded in 1963 as Binder Seidman International. BDO is an acronym for Binder Dijker Otte & Co., which was founded in 1973. In 2009, all BDO member firms changed their names to BDO.

BDO was believed to be quickly developing in China in early 2012. It employs 7,500-8,000 people in mainland China and Hong Kong, making it the second-largest employer after the United States, where it employs 11,500 people. According to its worldwide chairman, the Chinese workforce will likely surpass that of the United States within three to four years.

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Revenue: $10.3 billion
Website: https://www.bdo.global/en-gb/home

RSM International is an international network of accounting companies that is the world's sixth-biggest accountancy professional services network in terms of revenue. RSM member companies are independent accounting and advising businesses, each of which works independently but is unified as part of the network.

The network is not a distinct legal entity of any kind in any country, and it does not provide services. RSM US, formerly known as McGladrey, and RSM UK, formerly Baker Tilly LLP, are the largest member firms. As of 2015, the network's member companies were all renamed as RSM.

Like any accounting firm in the world, RSM offers service lines:

• Audit & Financial Reporting
• Tax Advisory
• Consulting

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Revenue: $6.3 billion
Website: https://www.rsm.global/
Facebook: https://www.facebook.com/GlobalRSM/

Grant Thornton is the world's seventh-largest professional services network by revenue and sixth-largest by employee count, consisting of independent accounting and consulting member firms that provide assurance, tax, and advisory services to privately held businesses, public interest entities, and public sector entities.

Grant Thornton International Ltd. is a private company limited by guarantee that operates as a not-for-profit, non-practicing international umbrella membership body. Grant Thornton International Ltd. is a limited liability company based in London, England, with no share capital.

According to Grant Thornton International Ltd., member companies in the worldwide organization operate in over 130 countries, employing over 56,000 people and generating a total global revenue of $5.76 billion. Grant Thornton International Ltd. conducts an annual worldwide research project called the International Business Report, which polls the opinions and aspirations of approximately 11,500 privately owned enterprises from 40 countries.

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Revenue: $5.72 billion
Website: https://www.grantthornton.global/en/

Nexia International is a prominent global network of independent accounting firms that provides customers with national and international audit, accounting, tax, and consulting services that are coherent, personalized, and tailored to their specific needs.

With $4.5 billion in revenue, Nexia has risen to the eighth largest accounting company in the world. Nexia International has over 265 member enterprises operating in over 128 countries and employing over 34,500 people worldwide. The company generates 50% of its sales in North America, 43% in Europe, the Middle East, and Africa, 6% in the Asia Pacific, and 1% in South America.

Nexia International's revenue comes from:

• Audit: 45%
• Tax: 26%
• Advisor: 29%

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Revenue: $4.5 billion
Website: https://nexia.com/

Crowe Global, also known as Crowe, and formerly Crowe Horwath International, is an international professional services network. It is the world's ninth-largest worldwide accounting network in terms of revenue. The network is made up of over 220 companies with over 42,000 people spread over 130 countries.

Crowe offers auditing, taxation, consultancy, corporate risk management, and financial advising services. In the fiscal year 2018, the network's overall revenue reached a new high of US$4.3 billion.

Horwath & Horwath was formed in New York by Hungarian immigrants Ernest and Edmund Horwath in 1915. The worldwide network rebranded and changed its name to Crowe in June 2018. Over 220 member businesses from throughout the world are now identified by a single name.

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Revenue: $4.3billion
Website: https://www.crowe.com/global
Facebook: https://www.facebook.com/CroweGlobal

Baker Tilly International is an accounting and business consulting network with 126 member companies in 147 countries. Member businesses that operate in more than one country are counted as one member by the corporation.

Baker Tilly is now the world's tenth-largest accounting network in terms of revenue. Their revenue in the most recent fiscal year was $3.4 billion. Baker Tilly also employs 30,490 people worldwide.

Baker Tilly Russaudit was started in 1992, and by the end of 2015, it has grown to 200 employees. At the time, a former Grant Thornton Russian member opted to merge with Baker Tilly International, providing the company with 18 partners and over 500 staff in Russia under the name Baker Tilly.

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Revenue: $4.04 billion
Website: https://www.bakertilly.global/en/home/
Facebook: https://www.facebook.com/BakerTillyInternational/