Mergers and acquisitions (M&A) allow companies to consolidate their organizations or assets. This process can involve anything from the purchase of specific assets to the consolidation of two companies.

The process can be complex, which is why merger consulting firms exist to advise on acquisitions or divestitures. CFOs and controllers work alongside these firms throughout the process to ensure a smooth transition.

The following companies represent the top M&A consulting firms in the United States (based on client and peer reviews) as well as the depth of their services.

1. Bain & Company

Bain & Company brings 40 years of consulting experience to the table, having worked with the majority of the Global 500 as well as smaller local organizations, nonprofits, and private equity funds. 

The company works with your top executives to assist in the decision-making process and find ways to implement those decisions. Historically, Bain & Company’s public clients have outperformed the stock market 4 to 1.

2. EY

As a global leader in assurance, tax, transaction, and advisory services, EY can help you deliver leaders and cultivate a better work environment. 

To be clear, EY refers to the global organization or to one of the member firms of Ernst & Young Global Limited, a UK company. Ernst & Young does not provide client services, but EY has developed a leading reputation for quality services around the globe.


Found in over 150 countries, KPMG International Limited operates through a network of member firms that provide audit, tax, and advisory services. Past clients have included business corporations, governments, public agencies, and nonprofits. 

KPMG places a high priority on sustaining the quality of your professional workplace while enhancing your credibility and social responsibility.

4. Mercer

Mercer is globally recognized as a leader in talent, health, retirement, and investment consulting. 

Operating in over 130 countries, Mercer seeks to partner with your leadership team to craft advice and solutions that fit your culture and business needs. It also takes employee feedback into consideration and brings to the table expert guidance and industry best practices.

5. NMS Consulting

NMS Consulting adopts a multi-disciplinary approach to its consulting services. It is organized around four business units: management consulting, corporate advisory, strategic communications, and tax advisory. 

NMS assists with acquisition, divestiture, strategic alliances, joint ventures, and more. By working alongside your leadership team, NMS can craft a strategy that aligns with your business goals for both short-term and long-term strategies.

6. Kearney

Kearney offers a flexible approach to the M&A process, helping you transform your business on your terms. But what sets Kearney apart is its core commitment to helping you manage your personnel. 

Kearney can help you evaluate your employees, review skills, and ensure that every member of your team is realizing their true potential. The end goal is to craft a solution that meets the needs of your business, the other parties involved in the merger/acquisition, and your existing employees and resources.

7. McKinsey & Company

McKinsey & Company helps organizations in the public, private, and social sectors. 

With a broad geographic reach, McKinsey is committed to helping clients reach their potential by tackling their greatest challenges head-on. This process relies on providing internal support, identifying core issues, and developing practical recommendations that match your team’s capabilities.

8. Boston Consulting Group (BCG)

Boston Consulting Group (BCG) is a leading global management consulting firm in its sixth decade of operation. 

The group owes its success to its emphasis on partnering with clients to challenge traditional thinking. As a result, companies unlock deep insight and find the courage and resources to act during a merger or another transformation process. Companies can use these insights to chart a course for the future with sustainable results.

9. CIL Management Consultants

CIL Management maintains offices in the U.S. and Europe and has nearly forty years of experience in international management consulting and business growth. Its tailored process involves extensive research, competitive analysis, and evaluation of your company’s performance. 

CIL maintains a goal of partnering with your existing leadership to craft solutions that provide a secure future, as well as devising strategies to ensure a smooth M&A process.

10. L.E.K. Consulting

L.E.K. offers a diverse range of business consultancy services, including assistance with mergers and acquisitions. The company was founded in 1983, and since then has expanded worldwide, providing advice and direction to businesses in diverse sectors as well as emerging businesses and private equity investors.

Getting the Most for Your Business

When you partner with a consulting firm, you want to ensure that they align with your strategic processes and help you reach your unique goals. This is true of any consulting service but can be especially important during a merger or acquisition. 

Fortunately, these globally recognized firms offer strategic solutions for a diverse array of businesses, ensuring a smooth transition no matter the industry.