William H. Aaronson
  1. Partner

Mr. Aaronson is co-head of Davis Polk’s global Mergers & Acquisitions Group. He advises clients on public and private mergers and acquisitions transactions, joint ventures and other corporate partnering arrangements, corporate governance matters, shareholder activism and other general corporate matters. 

Work Highlights

  • Advanced Accelerator Applications on its acquisition by Novartis
  • Attunity on its acquisition by Qlik Technologies
  • Chemtura in its sale to Lanxess
  • Comcast in its:
    • Superior proposal to acquire Sky plc
    • Acquisitions of AT&T Broadband, NBCUniversal, Craftsy, Daily Candy, Fandango and Plaxo
    • Investments in Comcast SportsNet Bay Area, Comcast SportsNet Houston and Comcast SportsNet Mid-Atlantic
  • Comodo Group on the acquisition of a majority stake in Comodo Certificate Authority by Francisco Partners
  • Emera in its acquisition of TECO Energy
  • FMC Corporation in the separation of its lithium division into a publicly traded company called Livent Corporation
  • Glenn Dubin in his investment in Castleton Commodities International
  • Hargray Communications in its sale to The Pritzker Organization
  • L Brands on the pending separation of Victoria’s Secret as a privately held company majority-owned by Sycamore Partners
  • MasterCard International in its: 
    • Acquisition of Applied Predictive Technologies
    • Acquisition of the TNS Gateway Services business
  • Millicom in its: 
    • Acquisition of Telefónica's assets in Panama, Costa Rica and Nicaragua 
    • Acquisition of Cable Onda, the largest cable and fixed telecommunications services provider in Panama
  • Mitsubishi Tanabe Pharma on its acquisition of NeuroDerm
  • NBCUniversal in its:
    • Acquisition of DreamWorks Animation
    • Combination of Fandango with Flixster and Rotten Tomatoes
    • Acquisition of The Blackstone Group’s 50% interest in the Universal Orlando theme park
    • Sale of its minority interest in A&E
  • NICE Systems in its acquisition of inContact
  • Solvay in its:
    • Acquisition of Cytec Industries
    • Acquisition of Chemlogics
    • Divestiture of its Eco Services business
  • Suez in its acquisition of GE Water & Process Technologies and sale of a minority stake in Suez Water Resources
  • TE Connectivity in its:
    • Acquisition of the Creganna Medical Group from the Permira Funds
    • Acquisition of Measurement Specialties
    • Acquisition of SEACON Group
    • Acquisition of Deutsch Group SAS from Wendel Group
    • Acquisition of ADC Telecommunications
    • Divestitures of its touch solutions, wireless, integrated products and automotive sensors businesses
  • Technip in its:
    • Merger with FMC Technologies
    • Acquisition of Global Industries
    • Acquisition of Stone & Webster Process Technologies from The Shaw Group


In February 2016, BTI Consulting Group named Mr. Aaronson a BTI Client All-Star in its 2016 annual report, which was based on a recent survey of general counsel. 

In October 2007, The New York Times listed Mr. Aaronson, along with several other Davis Polk partners, as one of the leading dealmakers on Wall Street under 40 years of age (“Facebook of Wall Street’s Future,” NYT, Oct. 3, 2007).

Professional History

  • Partner, 2003-present
  • Head of Client Development, 2016-2017
  • Associate, 1995-2003
  • Northern California office, 2004-2006

Bar Admissions

  • State of New York
  • State of California


  • B.A., Johns Hopkins University, 1992
    • Phi Beta Kappa
  • J.D., Harvard Law School, 1995
    • magna cum laude