Mergers and Acquisitions TRANSACTIONAL

WilmerHale lawyers have decades of experience advising public and private companies in all aspects of mergers and acquisitions in both the United States and Europe.

Market leaders in life sciences, technology, financial services, communications and many other industries turn to WilmerHale for legal advice and business advantage. In 2014, we advised clients throughout the United States and Europe on more than 75 M&A transactions with an aggregate value in excess of $50 billion, providing guidance in areas including corporate, securities, antitrust and tax. Since 2004, we have participated in more than 1,000 mergers and acquisitions with a total value in excess of $400 billion, ranging from sales of VC-backed companies to multibillion-dollar global mergers. Our experience ranges from public-public M&A transactions and the related disclosure and fiduciary duty issues to the unique issues presented by acquisitions of financial sponsor-backed private companies. We also advise clients on hostile transactions and activist investors, and represent investment banks serving as financial advisors in M&A transactions. 


Sort By
Bothwick, Jay E.

Jay E. Bothwick

Co-Chair, Mergers and Acquisitions Practice Group

+1 617 526 6526 (t)

Leibowitz, Hal J.

Hal J. Leibowitz

Co-Chair, Mergers and Acquisitions Practice Group

+1 617 526 6461 (t)

Bain, Mick

Mick Bain


+1 617 526 6158 (t)

Boot, Jeannette K.

Jeannette K. Boot


+1 212 295 6507 (t)

Borden, Mark G.

Mark G. Borden


+1 617 526 6675 (t)

Bothwick, Jay E.

Jay E. Bothwick


+1 617 526 6526 (t)

Braun, Martin

Dr. Martin Braun


+49 69 27 10 78 207 (t)

Brown, Lillian

Lillian Brown


+1 202 663 6743 (t)

Buckland, Peter

Peter Buckland


+1 650 858 6036 (t)

Coates, Sam

Samuel S. Coates


+1 650 858 6000 (t)


Representative experience includes:

  • Akamai Technologies' acquisition of Prolexic Technologies for $403 million
  • Analog Devices' acquisition of Hittite Microwave for $2.5 billion
  • Booz Allen Hamilton's acquisition of the Defense Systems Engineering & Support division of ARINC for $154 million
  • DirectEdge's acquisition by BATS Global Markets (undisclosed purchase price)
  • Durata Therapeutics' acquisition by Actavis for $760 million
  • NaturalMotion's acquisition by Zynga for $527 million
  • Palomar Medical Technologies' acquisition by Cynosure for $294 million
  • Staples' acquisition of Office Depot for $6.3 billion (pending)
  • The Medicines Company's acquisition of Rempex Pharmaceuticals for $474 million (including milestone payments)
  • Thermo Fisher Scientific's sale of its cell culture, gene modulation and magnetic beads businesses to GE Healthcare for $1.06 billion
  • TransUnion's acquisition of TLO for $154 million

Additional M&A experience: 20152014, 20132012, 2011, 2010, 2009

Publications & News


November 18, 2015

JUVE Ranks WilmerHale Lawyers and Practice Areas in Germany

JUVE, a prominent legal publication in Germany, highly recommends WilmerHale in several practice areas.

November 13, 2015

Second Circuit Clarifies Common Legal Interest and Work Product Doctrines for Material Shared Among Transacting Parties

The U.S. Court of Appeals for the Second Circuit recently ruled that the “common interest” doctrine protects legal and tax liability analysis prepared for a client and subsequently shared with a consortium of banks providing financing for the client.

November 2, 2015

WilmerHale Receives Top Rankings, Named “Law Firm of the Year” in Mutual Funds Law in 2016 U.S. News - Best Lawyers® “Best Law Firms” List

U.S. News - Best Lawyers® has named WilmerHale "Law Firm of the Year" in Mutual Funds Law and recognizes the firm as a first-tier law firm in 21 national and 58 metro-area rankings. In addition, the firm boasts more than 30 second- and third-tier rankings.

October 22, 2015

Navient Acquires Xtend Healthcare

Navient announced that it is leveraging its asset recovery and business process outsourcing capabilities into the fast-growing health care payments sector with the acquisition of Xtend Healthcare.

October 20, 2015

WEX Inc. Announces Definitive Agreement to Acquire Electronic Funds Source LLC

WEX Inc. announced it entered into a definitive agreement to acquire Electronic Funds Source LLC (EFS) for a total consideration of approximately $1.1 billion in cash and 4.0 million shares of common stock to be issued to investment funds affiliated with Warburg Pincus, EFS’ current owner.

September 18, 2015

Wilmer Cutler Pickering Hale and Dorr LLP Named a Top-Tier Firm by The Legal 500 UK

In the 2015 edition of The Legal 500 UK, WilmerHale is named a top-tier firm for dispute resolution - international arbitration and crime, fraud and licensing - fraud: white-collar crime, and is recommended in six other practice areas.

September 14, 2015

LMG Life Sciences Release 2015 Rankings, Again Names WilmerHale a "Life Cycle Firm"

In its latest edition, LMG Life Sciences recognizes eight WilmerHale practice areas and 16 attorneys, and for the fourth consecutive year names WilmerHale a "Life Cycle Firm."

July 1, 2015

WilmerHale Named a Leading National Firm in the United States by The Legal 500

The Legal 500 United States has released its annual rankings, selecting WilmerHale as one of the preeminent law firms in the country.

June 29, 2015

WilmerHale Reps Thermo Fisher Scientific in Agreement to Acquire Alfa Aesar

On June 25, Thermo Fisher Scientific Inc., the world leader in serving science, announced that it has signed a definitive agreement to acquire Alfa Aesar, a leading global manufacturer of research chemicals.

June 11, 2015

Merger Control Trends and the Wider M&A Landscape

An article featuring the WilmerHale 2015 M&A Report in the June 2015 issue of Financier Worldwide.