Katharine R. Haigh


Katharine R. Haigh

Katharine R. Haigh is an Associate in Wachtell, Lipton, Rosen & Katz’s Antitrust Group.  She specializes in complex U.S. and foreign merger control matters.  Katharine has worked with clients on extensive merger investigations in a wide range of industries, including technology, financial services, energy, consumer products, and industrials.  She regularly represents clients before the U.S. Federal Trade Commission and Department of Justice and has she managed substantive merger reviews approved by the European Commission, the UK Competition and Markets Authority, the Chinese State Administration for Market, the Japan Fair Trade Commission, and many others.

Recent representative transactions include:

  • Cantel Medical in its $4.6 billion acquisition by STERIS
  • Colgate-Palmolive Company in its €1.5 billion acquisition of Laboratoires Filorga Cosmétiques and its acquisition of Hello Products
  • Energy Transfer in its proposed $33 billion acquisition of The Williams Cos.
  • Entegris in its proposed $9 billion combination with Versum Materials
  • Global Payments in its $21.5 billion merger with TSYS
  • Marathon Petroleum in its $21 billion sale of its Speedway business to 7-Eleven
  • Michael Kors Holdings in its $2.1 billion acquisition of Versace
  • Penn National Gaming in its $2.8 billion acquisition of Pinnacle Entertainment and in its proposed $2 billion acquisition of Score Media & Gaming
  • Salesforce in its $15.7 billion acquisition of Tableau and its $29 billion acquisition of Slack
  • Spectra Energy in its $37 billion acquisition by Enbridge
  • Square in its proposed $29 billion acquisition of Afterpay
  • TransDigm in its $4 billion acquisition of Esterline
  • Uber Technologies in its $2.65 billion acquisition of Postmates and in the $4 billion sale of its Autonomous Technologies Group to Aurora Innovation
  • Varian Medical Systems in its $16.4 billion acquisition by Siemens Heathineers
  • Vulcan Materials in its $1.29 billion acquisition of U.S. Concrete

Prior to joining the firm, Katharine practiced antitrust and competition law in London and Brussels, where she advised on antitrust and competition aspects of mergers, acquisitions, government antitrust investigations, and antitrust counselling matters under European Union and UK competition laws.

Katharine received a B.A. with starred first class honors from Cambridge University, from which she graduated with the highest grades in her class.  She completed an LL.B. at The College of Law of England and Wales and a LL.M. from Columbia Law School, where she was a Harlan Fiske Stone Scholar.  She also holds graduate degrees from Cambridge University, the University of California-Los Angeles, and King’s College London.

Katharine is admitted to practice in New York and England and Wales.  Her pro bono representations include work with Her Justice and Sanctuary for Families.

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