15 Largest Consulting Companies In The World

By Abby McCain
Mar. 16, 2021
Fact Checked
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Everyone needs some advice once in a while, and companies and their leaders are no different. That’s why there’s an entire industry built around helping organizations of all kinds reach their goals and become as successful as possible.

The consulting firms that offer these services usually have offices and clients all over the world, and they often offer problem-solving products along with their expertise.

Here is a list of 15 of the largest consulting companies in the world, based on their most recently reported annual revenue:

15 Largest Consulting Companies in the World

  1. Tata Group. Mumbai, India

    Annual Revenue: $128 billion (2021)

    Tata Consultancy Services offers information technology, digital, and business consulting services to its clients. It also provides a variety of products and platforms to accomplish this. Headquartered in Mumbai, India, TCS is one of the largest companies in India and has been ranked on Forbes’ World’s Most Innovative Companies list.

    The company started in 1968 as Tata Computer Systems. Now, it has over 400,000 employees that serve clients in more than 10 industries, including financial services, health care, transportation, hospitality, distribution, utilities, insurance, manufacturing, and retail.

  2. Find Tata Group Jobs Near Me

  3. Deloitte. London, England, U.K.

    Annual Revenue: $50.2 billion (2021)

    Deloitte has a long history, as it started in 1845 in London. Since then, it has grown into a company that employs over 300,000 people across 150 countries. Even though Deloitte is based in London, it’s also been present in the U.S. since 1890 with its headquarters in New York City.

    Deloitte offers audit and assurance, regulatory, risk and financial advisory, and tax services in addition to its consulting services. Its consulting services alone earned it a revenue of $19.8 billion in 2020.

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  5. PricewaterhouseCoopers. London, England, U.K.

    Annual Revenue: $45.1 billion (2021)

    PricewaterhouseCoopers Advisory falls under the PricewaterhouseCoopers brand, one of the largest professional services networks in the world. Based in London, England, PwC has firms in 157 countries and employs 276,000 people.

    PwC Advisory offers strategy, management, risk, and technology consulting services to clients who operate in fields such as business, engineering, and technology.

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  7. Accenture. Dublin, Ireland

    Annual Revenue: $44.5 billion (2021)

    Accenture Consulting offers its clients a wide variety of consulting services in fields such as artificial intelligence, business process outsourcing, business strategy, infrastructure, and marketing.

    Accenture began in 1989 and now has 514,000 employees in its 200 locations across 50 countries. It serves clients in over 120 countries.

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  9. Ernst Young. London, England, U.K.

    Annual Revenue: $40 billion (2021)

    Even though it was founded in 1989, Ernst and Young can trace its roots all the way back to 1849 when Harding and Pullein, one of its ancestral firms, was founded. Over a century and a few mergers later, Ernst and Young came to be as it is today.

    Ernst and Young offer a variety of services in addition to consulting, including financial auditing, tax advisory, financial advisory, legal, and digital strategy.

    The company has over 200,000 clients in 150 countries and about 300,000 employees working in locations across those 150 countries as well. Ernst and Young’s U.S. branch has headquarters in Times Square in Manhattan, New York City, New York and is one of the U.S.’s largest privately-owned companies.

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  11. Cognizant. Teaneck, New Jersey, U.S.A.

    Annual Revenue: $18.507 billion (2021)

    Cognizant Technology Solutions is an information technology consulting company, but it also offers business consulting and outsourcing services.

    Based in Teaneck, New Jersey, Cognizant Technology Solutions started in 1994 as Dun and Bradstreet Software, an organization designed to serve Dun and Bradstreet’s technological needs.

    A few years later, the company started taking on clients outside of Dun and Bradstreet, and today it’s a Fortune 500 company that has over 280,000 employees worldwide, most of whom are in India.

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  13. Infosys Public Services. Fremont, California, U.S.A.

    Annual Revenue: $13.561 billion (2021)

    Infosys Consulting is a subsidiary of Infosys Limited that offers strategy, process engineering, and technology consulting for its over 200 clients in 19 countries.

    Founded in 2004, Infosys Consulting’s headquarters are in Fremont, California, but it also has 13 hubs in the U.S., Asia, Europe, and Australia, and it has over 6,000 employees.

    Infosys Limited is based in Bengaluru, India, and offers business consulting, information technology, and outsourcing services.

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  15. Boston Consulting Group. Boston, Massachusetts, U.S.A.

    Annual Revenue: $11 billion (2021)

    Founded in 1963, Boston Consulting Group is a management consulting firm that has been recognized as one of the largest and most prestigious consulting firms in the world. It’s also been credited with being a pioneer of business strategy.

    BCG has 21,000 employees who work in over 50 countries. It has several specialized business units, including BCG Digital Ventures, BCG OMNIA, BCG Henderson Institute, and Inverto.

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  17. McKinsey Company. New York, New York, U.S.A.

    Annual Revenue: $10 billion (2021)

    McKinsey and Company were founded in 1926 by a professor of accounting at the University of Chicago. The professor, James O. McKinsey, started the company as a way to correct some of the inefficiencies he noticed in suppliers during his time working for the U.S. Army.

    Today, McKinsey and Company offer management consulting services via its consultants who are also professional medical doctors, engineers, designers, data scientists, and business managers.

    The firm has locations in over 65 countries on six different continents.

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  19. CGI Group. Montreal, Canada

    Annual Revenue: $9.61 billion (2020)

    The CGI in CGI Group originally stood for “Conseillers en Gestion et Informatique,” or in English, “Consultants to Government and Industries.”

    Now, the company offers IT consulting services to financial, health care, government, telecommunications, utilities, manufacturing, retail, and distribution companies.

    CGI Group offers consulting, business process, managed application, systems integration, and technology management services to its clients located all over the world. The company has 400 locations and employs 76,000 people.

  20. Booz Allen Hamilton. McLean, Virginia, U.S.A.

    Annual Revenue: $7.464 billion (2020)

    Booz Allen Hamilton is a management and information technology consulting company based in McLean, Virginia. It’s a part of Booz Allen Hamilton Holding Corporation, which has companies that cover five core areas of expertise: consulting, analytics, digital solutions, engineering, and cyber.

    The revenue listed in this article is for the Holding Corp. as a whole.

    Booz Allen Hamilton was a forerunner of the management consulting sector from its founding in 1914 and since then has added the merger of the National and American Football Leagues to its list of accomplishments.

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  22. Bain Company. Boston, Massachusetts, U.S.A.

    Annual Revenue: $5.8 billion (2021)

    Bain Company offers consulting services in areas such as strategy, marketing, operations, information technology, digital transformation, sustainability, and finance.

    Founded in 1973, Bain Company has 59 offices in 37 countries and has committed to giving over $1 billion in pro bono services over ten years. The company has earned recognitions such as a number one ranking on Glassdoor’s Best Places to Work and has worked with 63% of the Global 500.

  23. Find Bain Company Jobs Near Me

  24. Gartner. Stamford, Connecticut, U.S.A.

    Annual Revenue: $4.73 billion (2021)

    Gartner is a research and advisory company that provides both consulting and technical services to help business leaders reach their goals.

    Gartner has almost 17,000 employees who serve clients in 100 countries. The company offers its clients expertise in customer service, finance, human resources, information technology, law and compliance, marketing, product management, research and development, sales, strategy, and supply chain management.

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  26. Mercer. New York, New York, U.S.A.

    Annual Revenue: $1.803 billion (2021)

    Mercer is a subsidiary of Marsh and McLennan, and it offers health and benefits, investment, workforce, career, and mergers and acquisitions consulting services to its clients.

    Mercer has locations in North America, Latin America, Europe, the Middle East, Africa, Asia, Australia, and New Zealand.

    Subsidiaries of Marsh and McLennan include Guy Carpenter, March, and Oliver Wyman.

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  28. Capgemini Invent. Paris, France

    Annual Revenue: $18.477 million (2021)

    Capgemini Invent is a business line of Capgemini Group that focuses on digital innovation, consulting, and transformation. Capgemini Group as a whole provides strategy, technology, data science, and creative design services.

    Capgemini Invent was launched in 2018 and is a combination of Capgemini’s original consulting group and its technology and data science experts who worked in other areas of the company. This merger allows it to offer technical solutions to clients as well as consulting services.

    Capgemini Invent has over 6,000 employees and over 40 offices and creative studios across the globe.

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Abby McCain

Abby is a writer who is passionate about the power of story. Whether it’s communicating complicated topics in a clear way or helping readers connect with another person or place from the comfort of their couch. Abby attended Oral Roberts University in Tulsa, Oklahoma, where she earned a degree in writing with concentrations in journalism and business.

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