Arthur Andersen LLP 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, 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.
Management consulting is the practice of providing consulting services to organizations to improve their performance or in any way to assist in achieving organizational objectives. Organizations may draw upon the services of management consultants for a number of reasons, including gaining external advice and accessing consultants' specialized expertise regarding concerns that call for additional oversight.
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.
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.
BDO USA, P.C. is the US member firm of BDO International, the 5th largest global accounting network with over $12.8 billion in revenue. It is the 6th largest accounting and professional services firm in the United States by revenue. In 2023, BDO USA, P.C. became the first large national accounting firm to convert from a traditional limited liability partnership, to an entirely employee owned corporation. Due to this conversion, all employees are eligible to gain an equity stake in the company. The company is currently headquartered in downtown Chicago. BDO stands for Binder, Dijker, and Otte, the original founders of the firm.
Pillsbury Winthrop Shaw Pittman LLP, also known as Pillsbury, is a full-service law firm with a particular focus on the energy, financial services, real estate and technology industries. Based in the world's major financial, technology and energy centers, Pillsbury counsels clients on global business, regulatory and litigation matters.
Thelen LLP, formerly known as Thelen Reid Brown Raysman & Steiner was a bicoastal American law firm formed by two mergers between California and New York–based law firms. The firm peaked at roughly 600 attorneys in 2006, and had 500 early in 2008, with attorneys with offices in eight cities in the United States, England and China. By the time of its decision to dissolve in late October 2008, it had shrunk to 400 attorneys through layoffs and attrition. Thelen was known for its preeminent construction practice which dates back to the 1930s and the local association between the law firm and contractors and developers of large hydroelectric dam projects. The construction practice offered regulatory, transactional and dispute resolution support. It was also known for its energy expertise, particularly in the electricity regulatory area, as well as for legal advice concerning technology and outsourcing.
Reed Smith LLP is a global law firm with more than 1,500 lawyers in 30 offices throughout the United States, Europe, the Middle East and Asia.
Crowell & Moring is an international law firm headquartered in Washington, DC, with offices in New York City, Los Angeles, San Francisco, Orange County, Chicago, Denver, London, Brussels, Doha, and Shanghai. With approximately 600 lawyers, the firm advises multinational corporations on regulatory, litigation, corporate, and investigations matters. As of 2022, Crowell & Moring is ranked among the top 100 law firms in the United States in The American Lawyer's "AmLaw 100" list, based on gross revenue.
Venable LLP is an American law firm headquartered in Washington, D.C. It is the largest law firm in the state of Maryland. Founded in 1900 by Richard Venable in Baltimore, Venable operates 13 offices across the United States and employs about 850 professionals specializing in regulatory, litigation, corporate, and investigations matters.
Guidehouse, Inc. is an American consulting firm for businesses and government entities. It is the successor to PricewaterhouseCoopers LLP’s public sector business and it was acquired in 2018 by Veritas. The head office is in Tysons, Virginia.
Beard Miller Company LLP (bmc), a legacy firm of ParenteBeard LLC, was an accounting and auditing firm serving clients mainly in the mid-Atlantic region of the United States. The firm was created through a series of mergers, the largest occurring in January 2001 between Beard & Company and Miller & Company. Prior to merging with Parente Randolph in October 2009, bmc had 16 offices located in Pennsylvania, Maryland, New Jersey, and New York, and more than 600 employees. bmc was a member of the larger BDO Seidman Alliance, which enables Accounting and Consulting organizations other than the "Big 4 auditors" to share resources which may be otherwise unattainable. The CEO of bmc was Lamar Stoltzfus, who is now chairman of ParenteBeard.
Forvis Mazars, LLP ranks among the U.S. top 10 public accounting firms, providing assurance, tax, and consulting services. In June 2024, Forvis Mazars Global network was formed between FORVIS and Mazars.
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 127 offices span across 10 out of 13 of the provinces and territories of Canada, as it does not have locations in Yukon, Northwest Territories, and Nunavut. With 8,000+ employees, MNP is the third largest professional service firms in Canada by headcount.
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.
FTI Consulting is a business consultancy firm founded in 1982 and headquartered in Washington, D.C., United States. The company specializes in corporate finance and restructuring, economic consulting, forensic and litigation consulting, strategic communications and technology. FTI Consulting employs more than 7,700 staff in 31 countries and is one of the largest financial consulting firms worldwide.
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.
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