Management consulting as a profession was pioneered in the United States, and even more than a century later, the U.S.-based companies remain the global benchmarks for corporate transformation consulting and business process re-engineering.

The market is divided into three main segments: the “MBB” consulting triumvirate (McKinsey & Company, Bain & Company, and Boston Consulting Group), the “Big Four” international accounting firms, and a set of specialty shops emerging from the MBB and Big Four, offering more specific advisory services (government relations, financial risk management, etc.).

Below are the descriptions of the top ten consulting companies according to their year of foundation, owner, specialization, and the range of services they offer.

Quick Comparison

Rank	Company	Founded	Owner / Founders	Headquarters	Core Focus
1	McKinsey & Company	1926	Global partnership; founded by James O. McKinsey	Chicago / New York	Corporate Strategy & Organisational Consulting
2	Boston Consulting Group (BCG)	1963	Global partnership; founded by Bruce Henderson	Boston	Strategy, Digital & Advanced Analytics
3	Bain & Company	1973	Global partnership; founded by Bill Bain	Boston	Strategy & Private Equity Advisory
4	Deloitte	1845 (global roots)	Global network of member firms	New York (US member firm)	Audit, Tax, Consulting & Risk Advisory
5	PwC	1849 (global roots; 1998 merger)	Global network of member firms	New York (US member firm)	Assurance, Tax & Advisory
6	EY	1849 (global roots; 1989 merger)	Global network of member firms	New York (US member firm)	Assurance, Tax & Strategy Consulting
7	KPMG	1870 (global roots; 1987 merger)	Global network of member firms	New York (US member firm)	Audit, Tax & Advisory Services
8	Accenture	1989 (as Andersen Consulting)	Publicly traded (NYSE: ACN)	Dublin / Chicago origin	Technology & Digital Transformation Consulting
9	Booz Allen Hamilton	1914	Publicly traded (NYSE: BAH); founded by Edwin G. Booz	McLean, Virginia	Government, Defence & Technology Consulting
10	Oliver Wyman	1984	Part of Marsh McLennan; founded by Alex Oliver & Bill Wyman	New York City	Financial Services & Risk Advisory

McKinsey & Company – Consulting Industry Trailblazer

 Image Courtesy: McKinsey & Company / Official Website

• Founded: 1926
• Owner / Founders: Global partnership; founder was James O. McKinsey
• Headquarters: Chicago; New York

McKinsey was founded in 1926 by James O. McKinsey, a professor at the University of Chicago, who is believed to have utilized his accounting expertise to rescue failing organizations. It was later developed into a major global enterprise by Marvin Bower. As of 2024, McKinsey’s revenue reached $16 billion, making it the highest-income MBB firm.

It has consistently ranked first in terms of prestige in Vault’s rankings for the past several years, achieving the top position in 2018. McKinsey boasts one of the most influential alumni networks in the corporate world. The company is also concentrating on digital business transformation consulting, analytics, and generative AI.

What McKinsey does: Strategic consulting, organizational transformation, and digital transformation consulting for corporations, governments, and not-for-profit entities.

Services: Corporate strategy and operational improvement, organizational design and transformation, digital, AI, and analytics consulting, and sustainability and public sector.

Boston Consulting Group – Strategic Consulting Innovator

 Image Courtesy: Boston Consulting Group  / Official Website

• Founded: 1963
• Owner / Founders: Global partnership; founder was Bruce Henderson
• Headquarters: Boston, Massachusetts

BCG was founded in 1963 by Bruce Henderson, who left the employ of Arthur D. Little to form his own consulting firm, where he pioneered innovative approaches to management, including the development of his company’s now-famous BCG matrix. The company has since grown to become a household name in consulting.

According to the 2026 Vault rankings, BCG is the third most prestigious firm in North America, with only McKinsey and Bain & Company (in second place) surpassing it, and by the narrowest margin in over a decade. Furthermore, the company has invested heavily in the development of its digital, analytics, and consulting services related to sustainability, including cutting-edge analytics consulting under the banner of BCG X.

What BCG does: Strategic consulting and digital transformation for multinational corporations and private equity firms.

Services: Corporate strategy and growth consulting, digital transformation, pricing and commercial insight, and sustainability and public sector consulting.

Bain & Company – Private Equity Consulting Specialist

 Image Courtesy: Bain & Company / Official Website

• Founded: 1973
• Owner / Founders: Global partnership; founder was Bill Bain
• Headquarters: Boston, Massachusetts

Bill Bain founded Bain & Company in 1973 as a BCG spin-off, aiming to give practical, results-driven advice rather than purely theoretical recommendations — an approach that’s helped it build one of the top private equity consulting practices. In the 2026 Vault prestige rankings, Bain overtook BCG to rank 2 in North America for the first time on record, though McKinsey held 1.

On overall “Best Firm to Work For,” Bain topped the 2026 Consulting 50 North America ranking, moving up from second place in 2025, while BCG slipped to second. Bain is known for its collaborative, “friendly” culture, serving clients from multinationals to PE firms across strategy, transformation, and due diligence work.

What Bain does: Strategy consulting, private equity support, and organizational transformation for multinational corporations and institutional clients.

Services: Corporate strategy and growth consulting, private equity and M&A support, digital transformation, and operational improvement.

Deloitte – Largest Professional Services Network

 Image Courtesy: Deloitte / Official Website

• Founded: 1845 (company with roots dating back to 1845)
• Owner / Founders: Global partnership; founded by William Welch Deloitte
• Headquarters: New York, New York

Deloitte was formed in 1845 by William Welch Deloitte, and it has since evolved into a massive global network of audit and consulting companies. Deloitte is currently the largest of the “Big Four” accountancy firms, and Deloitte US generates approximately $70.5 billion in revenue from both audit and consulting services, making it one of the largest consultancies in the country.

The company has a strong reputation for its ability to provide end-to-end solutions to its clients: in addition to traditional consulting services, Deloitte has a powerful corporate strategy practice, Monitor Deloitte.

What Deloitte does: Audit, tax, consulting, and risk advisory services for businesses and government entities.

Services: Financial audit, tax, technology and digital transformation consulting, and risk advisory services.

PwC – Assurance and Tax Consulting Giant

 Image Courtesy: PwC / Official Website

• Founded: 1849 (company with roots dating back to 1849)
• Owner / Founders: Global partnership; founded by Samuel Lowell Price
• Headquarters: New York, New York

PwC has origins dating back to 1849. The firm’s U.S. operations were formed when Price Waterhouse merged with Coopers & Lybrand in 1998 to create PricewaterhouseCoopers. PwC’s consulting services organization, Strategy&, has a rich history that predates many of its competitors, having been formed from the merger of several renowned firms, including Booz & Company.

PwC was one of the five consultancies that appeared in the 2026 Forbes prestige ranking, tying with McKinsey, Bain, BCG, and Deloitte. PwC has invested significantly in technology to digitize operations formerly dependent on manual processes, such as audits.

What PwC does: Assurance, tax, and consulting services for businesses.

Services: Financial audit, tax, management and technology consulting, and deals and forensic advisory services.

EY – Big Four Powerhouse with Strategic Consulting Wing

 Image Courtesy: EY / Official Website

• Founded: 1989 (companies with roots dating back to 1849)
• Owner / Founders: Global partnership; founded by multiple entities
• Headquarters: New York, New York

EY was formed in 1989 from the merger of Ernst & Young’s U.S. and international operations, though its founding firms date to the 19th century, and it’s known for strong auditing and consulting.

Its EY-Parthenon division rivals MBB in strategic advisory, ranked 5th in prestige in North America per the 2026 Vault rankings (behind Deloitte, McKinsey, Bain, and BCG). EY invests heavily in tech and cybersecurity for digital transformation, and its 2019 acquisition of Pangea3 lets it offer end-to-end legal services. As a global network, it combines local expertise with international reach for U.S. clients.

What EY does: Assurance, tax, consulting, and strategy and transactions advisory services for businesses.

Services: Financial audit, tax, technology and digital transformation consulting, and mergers and acquisitions advisory services.

KPMG – Auditing and Consulting Network

 Image Courtesy: KPMG / Official Website

• Founded: 1987 (companies with roots dating back to 1870)
• Owner / Founders: Global partnership; founded by multiple entities
• Headquarters: New York, New York

KPMG was formed in 1987 from the merger of Peat Marwick International and Klynveld Main Goerdeler, though its roots trace to the 19th century across the US, UK, Netherlands, and Germany. It’s a global network known for auditing and consulting, serving many Fortune 500 clients across banking, tech, and healthcare.

Its Global Strategy Group is one of the world’s largest strategy consulting divisions, working with corporates, PE, and VC firms. As a Big Four auditor, KPMG is investing heavily in AI-powered audit software to modernize its traditionally paper-based processes.

What KPMG does: Audit, tax, and consulting services for businesses, financial institutions, and government entities.

Services: Financial audit, tax advisory services, risk consulting, and transaction advisory services, and restructuring.

Accenture – Technology Consulting Behemoth

 Image Courtesy: Accenture / Official Website

• Founded: 1989 (as Andersen Consulting)
• Owner / Founders: Publicly traded (NYSE: ACN)
• Headquarters: Dublin, Ireland (with roots in Chicago)

Accenture was founded in 1989 as Andersen Consulting by 14 ex-Arthur Andersen partners who split from the firm’s management. It was rebranded as Accenture in 2001, right after the Enron scandal and Arthur Andersen’s demise.

Today, Accenture is a Fortune 1000 company with a market value of around $65 billion. Accenture provides consulting and technology services to Fortune 500 companies, including Microsoft, Google, and IBM, and it is considered one of the Big Four consulting firms.

What Accenture does: Technology consulting and digital transformation advisory services for global enterprises and government entities.

Services: Cloud and technology implementation, digital transformation, managed services, and generative AI and data analytics consulting.

Booz Allen Hamilton – America’s Oldest Consulting Firm

 Image Courtesy: Booz Allen Hamilton / Official Website

• Founded: June 18, 1914 (as Business Research Service)
• Owner / Founders: Publicly traded (NYSE: BAH); founder was Edwin G. Booz
• Headquarters: McLean, Virginia

Booz Allen Hamilton, founded in 1914 by Edwin G. Booz, is the oldest management consulting company in the US. The company shifted its focus to government and defense-related projects, playing a major role in events such as WWII and Apollo 11. Currently, it generates more than $10 billion in revenue, with a significant portion of its contracts coming from the US government, particularly in defense, intelligence, and civilian technology sectors.

The company has an advantage over the competition due to its security credentials and close ties to the government, with its current positioning as a “technology-driven” company, providing services such as artificial intelligence, cybersecurity, and digital engineering to the government.

What Booz Allen Hamilton does: Strategic management and technology consulting for the U.S. federal government, particularly defense and intelligence agencies.

Services: Government technology consulting services, cybersecurity, digital engineering and artificial intelligence, and management consulting.

Oliver Wyman – Financial Services Turned Strategy Consulting Specialist

 Image Courtesy: Oliver Wyman / Official Website

• Founded: 1984
• Owner / Founders: Part of the Marsh McLennan organization; founded by Alexander Oliver & William Wyman
• Headquarters: New York City, New York

Oliver Wyman was founded in 1984 by independent consultants Alexander Oliver and William Wyman, who split from Booz Allen Hamilton to form a new company that would specialize in a limited number of industries.

They quickly realized that the most effective way to provide their clients with high-quality services was to concentrate on large financial institutions. However, this strategy consulting company has since evolved into one of the most respected names in the financial services industry.

In comparison to other consulting firms, Oliver Wyman has a stronger presence in the financial sector, providing audit, risk, and actuarial services to some of the world’s largest banking institutions.

What Oliver Wyman does: Management consulting with a specialty on financial institutions, insurance, and risk advisory services.

Services: Financial services strategy and risk advisory, insurance and actuarial consulting, regulatory consulting, and quantitative and analytics consulting.

FAQs

What does “MBB” stand for?

“MBB” refers to McKinsey & Company, Boston Consulting Group (BCG), and Bain & Company – the three most elite strategy consulting firms in the world, with an average recruitment rate of only around 1%.

Which is the oldest consulting company on this list?

Deloitte has the longest history, as it was founded in 1845. However, Booz Allen Hamilton is the oldest consulting company that still operates as a standalone business in the U.S. (founded in 1914).

What are the “Big Four” consulting companies, and how do they differ from MBB?

The “Big Four” consulting companies are Deloitte, PwC, EY, and KPMG. They provide a wide range of auditing and tax services, as well as strategic management consulting, while MBB firms specialize in corporate strategy.

Which consulting company is the most prestigious in the U.S.?

McKinsey has been named the most prestigious firm in the world by Vault rankings in 2018 and has been ranked first in every Vault region since 2018.

Which consulting firm is the most specialized in government and defense?

Booz Allen Hamilton is the largest defense and intelligence consulting firm in the U.S., providing services to the federal government and generating the majority of its revenue from government contracts.

How is Accenture different from the Big Four or MBB consulting companies?

Accenture is a separate entity, and the firm is best known for its technology consulting services, although it provides a wide range of strategic management services. It tends to serve Fortune 500 companies, including tech giants such as Microsoft, Google, and IBM.

Which consulting firm on this list specializes in financial services?

Among the companies on this list, Oliver Wyman provides financial institutions with actuarial, insurance, and risk advisory services.

By revenue, which are the largest consulting-adjacent companies in the U.S.?

Accenture, Deloitte, PwC, EY, and KPMG are all large multinational corporations with revenues of around $40-$70 billion per year, compared to $10-$15 billion for MBB firms.

Are McKinsey, BCG, and Bain owned by private shareholders or founders?

They are privately owned; there is no central authority that oversees the operations of McKinsey, BCG, or Bain – each company is run by a collective of founders and senior leadership.

Why do MBB consulting companies attract candidates despite having lower average compensation than technology companies?

They offer unparalleled prestige and opportunities to work with Fortune 500 companies and generate tremendous alumni networking value.

Conclusion

The most prestigious consulting firms in the United States were formed at different times and through different methods. Thus, Booz Allen Hamilton was founded first in 1914 and played a leading role throughout the early years of consulting development.

Then, in the 1950s and 1960s, the strategy consulting field was pioneered by McKinsey, BCG, and Bain. The Big Four accounting firms later transformed into multinational consulting giants. Accenture, in turn, was formed from Arthur Andersen’s dissolution and emerged as a global technology consulting company.

Therefore, it is reasonable to suggest that consulting will continue to shape and influence political and business spheres for decades to come. Regardless of whether a reader goes through this list in 2023 or 1950, these ten companies will be at the forefront of the modern economy and decision-making for both organizations and governments.