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


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.

February 8, 2018

WilmerHale Represents Westmount Asset Management on Sale of Rosemont Stake to Temperance Partners

Westmount Asset Management, one of the oldest and largest independent investment firms in Los Angeles, has closed on the sale of Rosemont Investment Partners' stake in the firm to Temperance Partners.

January 29, 2018

HSR Size of Transaction Threshold to Increase to $84.4 Million

The Federal Trade Commission ("FTC") announced revised thresholds for merger notifications under the Hart-Scott-Rodino ("HSR") Act.

January 26, 2018

WilmerHale Represents Karyopharm in Agreement with Biogen to Acquire KPT-350

Karyopharm Therapeutics Inc. announced its entry into an agreement for Biogen to acquire Karyopharm's investigational oral SINE compound KPT-350 and other assets for the treatment of certain neurological and neurodegenerative conditions.

January 25, 2018

WilmerHale Reps WorkMarket in Acquisition by ADP

On January 22, 2018, ADP® announced the acquisition of WorkMarket, a leading cloud-based workforce management solution provider that allows companies to build and manage an integrated workforce across W-2 employees, 1099 contractors, vendors and other types of workers.

January 23, 2018

Flywire Expands Global Payments Platform with the Addition of OnPlanU and OnPlan Health

On January 18, 2018, WilmerHale client Flywire, a provider of global payment and receivables solutions for education, healthcare and business, announced the acquisition of OnPlan Holdings LLC, the parent company of OnPlanU and OnPlan Health.

January 23, 2018

WilmerHale Represents HS2 Solutions in Acquiring LunaMetrics

Digital transformation agency HS2 Solutions announced that it has completed the acquisition of LunaMetrics, an award-winning analytics consultancy that specializes in using data to help businesses illuminate the bridge between marketing, user behavior and ROI.