Magnus Karlberg is a Corporate & Securities partner in Mayer Brown’s San Francisco office. Magnus Karlberg advises private and public companies as well as investors on a variety of corporate and securities law matters, including mergers, acquisitions, corporate governance, venture financings, joint ventures and other strategic transactions. Magnus counsels clients in a wide range of industries, including the life science, consumer goods, insurance, banking and energy sectors, and often with a focus on emerging technologies. 


Certain Representative Matters

Life Science

  • Nestlé S.A. in its $11.85 billion acquisition of Pfizer’s infant nutrition business.
  • Nestlé S.A. in its on-sale of Australian, South African and Latin American infant nutrition businesses to the Aspen Group.
  • Nestlé S.A. in the restructuring of its joint venture (Dairy Partners Americas) with Fonterra Cooperative Group of New Zealand for the manufacture of milk powders and the manufacture, distribution and sale of flavored milks and other dairy products throughout North, Central and South America and the Caribbean.
  • Nestlé Health Science in its license and collaboration transaction with Seres Therapeutics, Inc. for the development of biologics based on the human microbiome in certain indications. The transaction provides for an upfront payment to Seres of $120 million and contingent payments tied to development and sales milestones.
  • Nestlé Health Science in its acquisition of Persona.
  • Sellers in the sale of County Line Pharmaceuticals LLC to Alvogen Group, Inc.


  • Harvard Law School, LLM
  • University of Gothenburg, JD, summa cum laude
  • Universidad de Granada (Spain)


  • California
  • New York


  • Norwegian
  • Spanish
  • Swedish