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 2016, we advised clients on more than 75 M&A transactions with an aggregate value of approximately $50 billion, providing guidance in areas including corporate, securities, antitrust and tax. Since 2006, 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: 20172016, 20152014, 20132012, 2011, 2010, 2009

Publications & News


December 15, 2017

The M&A Advisor Honors WilmerHale With Deal of the Year Award for Representing Analog Devices

The M&A Advisor has honored WilmerHale with its annual Deal of the Year award for representing Analog Devices in the sale of Cyber Security Solutions business of Sypris Electronics LLC to Analog Devices, Inc.

December 6, 2017

WilmerHale Represents Regal Entertainment Group in Signing of Definitive Agreement to Be Acquired by Cineworld Group PLC

Regal Entertainment Group announced that it has entered into a definitive merger agreement with Cineworld Group PLC for Cineworld, the UK's largest cinema operator.

December 5, 2017

Astellas Acquires Mitobridge Under Existing Collaboration

Astellas Pharma Inc. and Mitobridge, Inc. announced that Astellas has exercised its exclusive option right to acquire Mitobridge under the amended terms of the October 2013 partnership agreement.

December 5, 2017

TMX Group Announces Agreement with Intercontinental Exchange to Acquire Trayport and Sell NGX

On October 27, 2017, TMX Group Limited announced it has entered into an agreement to acquire London-based Trayport Holdings Limited, and its US-based affiliate, Trayport Inc.

November 30, 2017

WilmerHale Represents AM General in Commercial Plant Acquisition by SF Motors

WilmerHale client AM General has sold its commercial assembly plant in Mishawaka, Indiana to SF Motors, an electric vehicle clean mobility company.

November 29, 2017

WilmerHale Represents Akamai in Acquisition of Nominum

Akamai Technologies, Inc. announced the company completed its acquisition of Nominum, a provider of DNS-based security solutions supporting many of the world's leading carriers.

November 7, 2017

LMG Life Sciences 2017 Honors WilmerHale With Top Rankings

LMG Life Sciences has recognized WilmerHale among the nation's leading life sciences law firms in its 2017 rankings, citing the firm's Life Sciences Practice as “renowned for its range and multidisciplinary teams that counsel clients in technology, pharmaceutical and medical device companies as well as investment banks and venture capitalists.”

October 6, 2017

WilmerHale Represents Navient in $155M Acquisition of Earnest

Navient, a leading provider of asset management and business processing solutions, announced it has entered into an agreement to acquire Earnest, a leading financial technology and education finance company.

October 2, 2017

Wait, I Thought We Were Done? DOJ Challenges $4B Merger Months After HSR Filing and Expiration of the HSR Waiting Period

Earlier this week, the Antitrust Division of the Department of Justice filed a lawsuit seeking to unwind Parker-Hannifin's $4.3 billion consummated acquisition of Clarcor.

September 28, 2017

WilmerHale Represents CIRCOR in $855M Acquisition of Colfax’s Fluid Handling Business from Colfax Corp.

CIRCOR International, Inc.—a leading provider of flow control solutions and other highly engineered products for markets including oil & gas, aerospace, power, process and general industrial—announced that it has signed a definitive agreement to acquire Colfax Fluid Handling (CFH) from Colfax Corporation for approximately $855 million including cash, newly issued CIRCOR shares, and the assumption of pension plan liabilities linked to the CFH business.