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 2017, we advised clients on more than 75 M&A transactions with an aggregate value of approximately $60 billion, providing guidance in areas including corporate, securities, antitrust and tax. Since 2007, 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. 

U.S. News - Best Lawyers highlights our “top-notch service,” with clients stating that the firm is “a one stop shop” with “experts in all areas.” Clients also state that “WilmerHale offers practical solutions to complex cutting edge legal problems” and has “a willingness to be an advocate for clients.”


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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)

Bonnes, Andrew

Andrew Bonnes


+1 617 526 6136 (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)


Representative experience includes:

  • Akamai Technologies' acquisitions of Codemate for $107.5 million, Prolexic Technologies for $403 million and Soha Systems for $60 million;
  • Analog Devices' acquisition of Linear Technology for $14.8 billion and Hittite Microwave for $2.5 billion;
  • AS&E's acquisition by OSI Systems for $269 million;
  • ASICS Corporation's acquisition of FitnessKeeper (undisclosed);
  • Barclays' sale of US wealth and investment management business to Stifel Financial Corporation (undisclosed);
  • Booz Allen Hamilton's acquisition of the software services business of SPARC (undisclosed);
  • Cumberland Farms' sale of Gulf Oil business to ArcLight Capital Partners (undisclosed);
  • Cynosure's acquisition by Hologic for $1.6 billion;
  • Danaher Corporation's acquisition of Phenomenex (undisclosed);
  • Demandware's acquisition by for $2.8 billion;
  • Durata Therapeutics' acquisition by Actavis for $760 million;
  • Endurance International Group's acquisition of Ace Data Centers for $73.3 million;
  • First Marblehead Corporation's acquisition by FP Resources USA for $65.5 million;
  • Gilt Groupe Holdings' acquisition by Hudson's Bay Company for $250 million;
  • Hilton Worldwide Holdings' sale of a 25% equity interest by Blackstone to HNA Tourism Group for $6.5 billion;
  • Kronos' acquisition of Empower Software (undisclosed);
  • MetaMind's acquisition by for $32.4 million;
  • Micro Focus' acquisition of Serena Software for $540 million;
  • Millennium Pharmaceuticals' $125 investment in Maverick Therapeutics and related collaboration and option to acquire for an undisclosed amount;
  • MKS Instruments' acquisition of Newport Corporation for $980 million;
  • Munchkin's acquisition of Milkmakers (undisclosed);
  • Orbitera's acquisition by Google (undisclosed);
  • Oxitec's acquisition by Intrexon Corporation for $160 million;
  • PAREXEL International Corporation's acquisition of ExecuPharm for $135 million;
  • PerkinElmer's sale of medical imaging business to Varian Medical Systems for $276 million;
  • Progress Software's acquisition of Telerik for $262.5 million;
  • Red Hat's acquisition of 3scale for $29.1 million;
  • REDI Holdings' acquisition by Thomson Reuters (undisclosed);
  • Regal Entertainment Group's acquisition by Cineworld Group PLC for $5.9 billion;
  • Staples in its acquisition by Sycamore Partners for $6.9 billion;
  • Thermo Fisher Scientific's acquisition of Alfa Aesar research chemicals business of Johnson Matthey for approximately $405 million and the sale of its cell culture, gene modulation and magnetic beads businesses to GE Healthcare for $1.06 billion;
  • The Medicines Company's sale of global portfolio of hemostasis products to Mallinckrodt for $410 million; and
  • WEX's acquisition of Electronic Funds Source for $1.4 billion.

Additional M&A experience: 201820172016, 20152014, 20132012, 2011, 2010, 2009

Publications & News


May 10, 2018

WilmerHale Counsels Braintree Laboratories in Acquisition by Sebela Pharmaceuticals

On May 1, 2018, Sebela Pharmaceuticals completed the acquisition of Braintree Laboratories Inc., a privately held specialty pharmaceutical company based in Braintree, Massachusetts. Braintree develops, manufactures and markets specialty pharmaceuticals in gastroenterology.

May 3, 2018

WilmerHale Lawyers and Practices Recognized in 2018 Edition of Chambers USA

Chambers and Partners announced its rankings for the 2018 edition of Chambers USA: America's Leading Lawyers for Business, with WilmerHale listed among the nation's best in 50 practice area categories. Chambers also ranked 95 WilmerHale lawyers as leaders in their respective fields.

May 2, 2018

WilmerHale Named to IFLR Americas Shortlist for M&A and Private Equity

The International Financial Law Review has named WilmerHale to its shortlist of nominees for its 2018 Deals of the Year Award.

April 27, 2018

SEC Targets Inadequate Cyberbreach Disclosure in Yahoo Settlement

On April 24, 2018, the Securities and Exchange Commission announced a settled enforcement proceeding against Altaba Inc. (formerly known as Yahoo! Inc.) arising out of data breaches suffered by Yahoo in 2014, 2015 and 2016. 

April 11, 2018

WilmerHale Counsels Analogic in $1.1B Acquisition by an Affiliate of Altaris Capital Partners

On April 10, 2018, Analogic Corporation, a provider of leading-edge healthcare and security solutions, and Altaris Capital Partners, LLC, a leading private investment firm with expertise in Analogic's end markets, announced that they have entered into a merger agreement under which Analogic will be acquired by Altaris for approximately $1.1 billion on a fully diluted basis.

March 26, 2018

Pre-Merger Information Sharing: The FTC Weighs In

A month ago, we covered recent European competition law developments on pre-merger information sharing and “gun jumping” among merging parties. In a timely reminder that the same questions also are relevant in the United States, the Federal Trade Commission recently issued a blog post on antitrust pitfalls during pre-merger discussions and due diligence.

March 21, 2018

Selected 2018 M&A Transactions

In 2017, we advised clients on more than 75 M&A transactions with an aggregate value of approximately $60 billion, providing guidance in areas including corporate, securities, antitrust and tax. Since 2007, 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.

March 16, 2018

WilmerHale Recognized for Outstanding International Lawyers and Practices in Chambers Global 2018

In the 2018 edition of Chambers Global, 33 WilmerHale lawyers were named among “The World's Leading Lawyers for Business."

February 14, 2018

Senior EU Court Adviser Provides Welcome Guidance on Gun-Jumping

EU and US laws prohibit merging companies from implementing reportable transactions until their deal is cleared or the statutory waiting period has expired.

February 8, 2018

WilmerHale Advises on the Formation of Valence Media, a New Diversified Media Company

WilmerHale served as legal counsel in connection with the creation of Valence Media, a new diversified media company formed through the combination of three successful media companies: Billboard-Hollywood Reporter Media Group, dick clark productions and MRC.