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.
Ernst & Young Global Limited, trade name EY, is a British 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.
Deloitte Touche Tohmatsu Limited, commonly referred to as Deloitte, is a British multinational professional services network. 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.
AllianceBernstein Holding L.P. (AB) is a global asset management firm providing investment management and research services worldwide to institutional, high-net-worth and retail investors.
Mesirow is a privately held financial services company based in Chicago, Illinois. The firm is employee-owned and 100% of voting shares are held by employees. Mesirow provides investment management, capital markets, wealth management and investment banking services.
Edward Farrell "Ed" Feighan is a former American politician. He served as a member of the Ohio House of Representatives, and as a Democratic Party U.S. Representative from 1983 to 1993, serving Ohio's 19th congressional district.
Marsh & McLennan Companies, Inc., doing business as Marsh McLennan, is a global professional services firm, headquartered in New York City with businesses in insurance brokerage, risk management, reinsurance services, talent management, investment advisory, and management consulting. Its four main operating companies are Marsh, Guy Carpenter, Mercer, and Oliver Wyman.
Houlihan Lokey, Inc., is an American multinational independent investment bank and financial services company. Houlihan Lokey was founded in 1972 and is headquartered at Constellation Place in Century City, Los Angeles, California. The firm advises large public and closely held companies as well as institutions and governments. Its main service lines include mergers and acquisitions, capital markets, restructuring and distressed M&A, fairness opinions, and financial and valuation advisory. As of March 2024, Houlihan Lokey employs more than 2,600 employees worldwide.
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.
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.
Colliers International Group Inc. is a Canada-based diversified professional services and investment management company with approximately 18,000 employees in more than 400 offices in 65 countries.
Segal is a benefits and human resources consulting firm headquartered in New York City, with 1,100 employees throughout the U.S. and Canada. It is the parent of Segal Marco Advisors, Segal Select Insurance Services, Inc., andSegal Benz.
Greg LaFollette is a CPA, CGMA, and an AICPA credentialed CITP in Sioux Falls, SD., the president and CEO of LaFollette Consulting LLC. He travels nationally as a consultant and conference speaker on the topic of technology in accountancy, his acknowledged area of expertise.
Plante Moran is one of the largest audit, tax, consulting, and wealth management firms in the United States according to Inside Public Accounting's list of the “Top 100” firms. The firm employs more than 3,800 people and has 23 offices in Michigan, Ohio, Illinois, Colorado, Mexico, India, Japan, and China.
West Monroe is a digital services firm headquartered in Chicago, Illinois. West Monroe provides traditional management consulting, creative and product engineering services to businesses across many industries, including consumer and industrial products, energy and utilities, financial services, healthcare, life sciences, private equity, retail, and software and high tech. West Monroe is consistently recognized as a best place to work and a top consulting firm. West Monroe’s tagline is "Don’t Do Digital. Be Digital."
CBIZ CPAs is a national CPA firm founded and headquartered in Kansas City, Missouri. MHM has over 30 offices in the United States.
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$5.2 billion. Baker Tilly operates geographically through four regions: Asia Pacific; Europe, Middle East and Africa; Latin America; and North America. Each region has a chair, appointed by the International Board, who leads an advisory council elected by members in that region.
Ryan LLC is a tax services and software provider based in Dallas, Texas. Ryan LLC has 18,000 clients in over 60 countries. The company has over 113 locations around the globe, including locations in Canada, the Netherlands, the United Kingdom, India, the Philippines, and Australia.
Robert Half Inc. is an international human resource consulting firm founded in 1948, based in Menlo Park and San Ramon, California. It is among the world's largest accounting and finance staffing firms, with over 345 locations worldwide.
BDO is an international network of public accounting, tax, consulting and business advisory firms that provide professional services under the name BDO. It is the fifth-largest accounting network in the world. Global fee income of the member firms in the network for the year ended 30 September 2023, including the members of their exclusive alliances, totaled US$ 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).
US$1.59 billion (2023) [2] 
US$165 million (2023) [2] 
