Marguerite M. Sullivan

Maggy Sullivan is a partner in the Litigation & Trial Department of Latham & Watkins and a member of the firm’s Antitrust & Competition Practice. She specializes in both private and government antitrust matters, and has defended corporate clients in cartel investigations, complex civil actions, multi-district actions and class actions.

Ms. Sullivan focuses on criminal cartel investigations and amnesty applications before the Department of Justice’s Antitrust Division, class actions and business to business litigation in state and federal courts, and antitrust compliance counseling. She has been involved in some of the largest and most complex antitrust matters to date.

Ms. Sullivan’s antitrust work has covered a wide range of industries, including: 

  • Consumer products 
  • Automotive 
  • Healthcare 
  • Medical dictation 
  • Paper 
  • Cable and satellite 
  • Horse racing 
  • Construction materials 
  • Specialty chemicals 
  • Textiles

Ms. Sullivan has served as the Vice Chair of the Global Recruiting Committee and as a member of Latham's Equal Employment Opportunity Board. She is also an effective member of the Women Enriching Business (WEB) Committee.

Ms. Sullivan is co-author of "Class/Collective Actions in Europe: overview of applicable EU law principles", a chapter within the book "Class Actions - A Global Guide from Practical Law", 2015. She also co-authored "Resale Pricing Issues", a chapter in the 2013 Edition of the ABA Antitrust Section’s, Antitrust Law and Economics of Production Distribution, the article "Three Years After Credit Suisse v. Billing: Courts Still Find The Implied Immunity Doctrine Plainly Repugnant" (Antitrust Practitioner, Vol. 7, 2010) and "Breaking New Ground: Direct Settlement of EC Cartel Cases" (Global Competition Review 2008). Ms. Sullivan appeared as a speaker at the 2012 C5 Global Investigations Europe conference in Berlin, Germany. Her presentation was titled "Tackling the Varying Uses of Privilege during Multijurisdictional Investigations: Developing a Strategy that will Allow you to Protect Corporate Documents."

In 2012, Euromoney Legal Media Group recognized Ms. Sullivan as a Rising Star in Litigation at its inaugural America’s Women in Business Law awards.