Stuart N. Senator

Stuart N. Senator

Stuart N. Senator is a litigation partner in the Los Angeles office of Munger, Tolles & Olson LLP.

His practice focuses primarily on complex business litigation in trial and appellate courts, and investigations led by the Federal Trade Commission and Department of Justice. Mr. Senator’s clients include a diverse group of national and international companies, and his major areas of practice include antitrust, unfair competition, legal malpractice/malicious prosecution and law firm ethics and conflicts of interest.

Mr. Senator provides antitrust counseling and compliance advice on numerous subjects, including distribution practices, pricing, trade association activity and mergers. In 2023, Mr. Senator was named a Top Health Care Lawyer by the Daily Journal for the second consecutive year and has also previously been recognized by Lawdragon as one of the 500 Leading Litigators in America. He has also been an invited presenter at various professional conferences regarding antitrust issues. In addition to his work for clients, Mr. Senator is General Counsel to the firm, advising on issues relating to legal ethics and law firm management.

Community Service/Pro Bono

Mr. Senator is active in community affairs and pro bono matters. He has been a trustee of the Santa Monica Mountains Conservancy Foundation, a director of Menorah Housing Foundation and a trustee of the California State Parks Foundation.

Mr. Senator received the Social Justice Award from the American Civil Liberties Union for his work in leading litigation to protect farm workers from unsafe work conditions and received Public Counsel’s Pro Bono Award for Impact Litigation for his continued work on this issue. Mr. Senator has also received the Western Law Center For Disability Rights' Pro Bono Award for leading litigation to further the rights of individuals with disabilities.


Key Representations

  • Solvay Pharmaceuticals in the U.S. Supreme Court in FTC v. Actavis, in which the Court determined the appropriate level of antitrust scrutiny for so-called “reverse payment” settlements of pharmaceutical patent litigation and rejected the FTC’s proposed presumption of illegality for those settlements.
  • Universal Music in obtaining government approval for its acquisition of EMI, as well as in federal antitrust litigation regarding Minimum Advertised Pricing policies.
  • Salomon Brothers in the Department of Justice’s investigation and class action litigation regarding Nasdaq trading practices.
  • Universal Home Video in federal antitrust litigations regarding video distribution.
  • Shell Oil Company in defense of antitrust challenges to gasoline pricing and joint ventures, including obtaining a unanimous decision of the U.S. Supreme Court in Shell's favor.
  • AbbVie Inc., formerly Abbott Laboratories, in:
    • Multiple class actions and litigation by a competitor, alleging predatory pricing of HIV drugs.
      • Obtained a defense verdict at a jury trial on the competitor’s antitrust claims for $1.7 billion in damages, which was recognized by the Daily Journal as one of the top verdicts of 2011.
      • Obtained ruling from U.S. Court of Appeals for the Ninth Circuit in the indirect purchaser class action that Abbott pricing was not actionable under the antitrust laws.
    • Government investigations and multi-district civil class action litigations alleging that settlements of patent litigation violated federal and state antitrust laws.
      • Obtained precedential decision from Eleventh Circuit rejecting per se rule and articulating standard for analysis of patent settlements under antitrust laws.
      • Obtained appellate decision vacating district court’s certification of class of direct purchasers.
      • Obtained defense verdict in a jury trial on all claims of a non-settling defendant, affirmed by Ninth Circuit in a decision cited by Law360 as one of 2009’s major decisions in antitrust law.
      • Obtained dismissal of Federal Trade Commission’s first post-Actavis challenge to an alleged “reverse payment” settlement.
  • Takeda Pharmaceuticals in defense of class action and private litigation alleging violation of the antitrust laws from a pharmaceutical intellectual property settlement agreement.
  • 1-800 Contacts in defense of federal antitrust litigation alleging sham litigation and unreasonable restraints of trade relating to pursuit and settlement of trademark infringement claims.
  • LG Display in defense of class action and individual antitrust cases stemming from allegations of price-fixing among manufacturers of LCD panels.
  • United Farm Workers and individual farm workers in litigation that resulted in Cal/OSHA’s increased oversight of agriculture employers’ provision of shade, water and rest breaks for farm workers who pick crops in sweltering heat. 
  • International, national and local law firms in defending legal malpractice claims, including class action claims, and advising on avoiding claims.
  • International, national and local law firms in defending against disqualification motions.