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 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.
PricewaterhouseCoopers International Limited is a British 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.
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.
Landor is a brand consulting firm founded in 1941 by Walter Landor, who pioneered some research, design, and consulting methods that the branding industry still uses.
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 employees in the world and is considered one of the Big Four accounting firms, along with EY, KPMG, and PwC.
Cognizant Technology Solutions Corporation is an American multinational information technology services and consulting company. It is headquartered in Teaneck, New Jersey, U.S. Cognizant is part of the NASDAQ-100 and trades under CTSH. It was founded in Chennai, India as an in-house technology unit of Dun & Bradstreet in 1994, and started serving external clients in 1996. After a series of corporate reorganizations, there was an initial public offering in 1998. Ravi Kumar S has been the CEO of the company since January 2023, replacing Brian Humphries.
Publicis Groupe is a French multinational advertising and public relations company. One of the oldest and largest marketing and communications companies in the world, it is headquartered in Paris.
Genpact Ltd. is an American multinational information technology services, consulting, and outsourcing company headquartered in New York City, New York. Founded in Gurgaon, India, and legally domiciled in Bermuda, Genpact currently employs more than 125,000 people and provides services to clients in over 30 countries worldwide. Genpact is listed on the NYSE and generated revenues of US$4.48 billion in 2023.
Oliver Wyman, LLC is an American management consulting firm. Founded in New York City in 1984 by former Booz Allen Hamilton partners Alex Oliver and Bill Wyman, the firm has more than 60 offices in Europe, North America, the Middle East, and Asia-Pacific employing over 5,000 professionals. The firm is part of the Oliver Wyman Group, a business unit of Marsh McLennan.
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.
EPAM Systems, Inc. is an American company that specializes in software engineering services, digital platform engineering, and digital product design, operating out of Newtown, Pennsylvania. EPAM is a founding member of the MACH Alliance.
Mercer is an American consulting firm founded in 1945. It is one of the four operating subsidiaries of global professional services firm Marsh McLennan. Mercer is headquartered in New York City with offices in 43 countries and operations in 130 countries. The company primarily provides human resources and financial services consulting services to its clients.
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.
Aon Hewitt was a provider of human capital and management consulting services headquartered in Lincolnshire, Illinois in the United States. From 500 offices in 120 countries, it provided consulting, outsourcing, and reinsurance brokerage services. The "Aon Hewitt" brand and legal entities have now been absorbed into the "Aon" business, leaving obsolete the names "Hewitt" and "Aon Hewitt."
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."
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.
EY-Parthenon is Ernst & Young's global strategy consulting arm. The firm was established as The Parthenon Group LLC in 1991 by former Bain & Company directors William "Bill" Achtmeyer and John C. Rutherford. In 2014 The Parthenon Group merged with professional services firm EY forming the new entity EY-Parthenon. The move was viewed as part of the continued efforts by the Big Four to move up the value chain from their traditional audit services into more lucrative areas of business, as well as to provide new points of entry to clients.
USD 1.98 billion (2022)