Sean R. Matt

Leads the firm's innovation in organizing and prosecuting individual class cases across many states involving the same defendants and similar factual and legal issues, an approach that continues to be a key factor in the firm's success
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Current Role

  • Partner, Hagens Berman Sobol Shapiro, since its founding in 1993
  • Practice focuses on multi-state and nationwide class actions and complex commercial litigation encompassing securities and finance, consumer, antitrust, insurance and products
    Diverse experience in most of the firm’s practice areas, involving appearances in state and federal courts across the country at both the trial and appellate levels
  • Key member of the firm’s securities litigation team, most recently co-leading the prosecution and settlement of the In re Charles Schwab Securities Litigation, the In re Oppenheimer Champion Income Fund Securities Class Actions and the Oppenheimer Core Bond Fund Class Action Litigation
  • Key member of the firm’s pharmaceutical litigation team that confronts unfair and deceptive pricing and marketing practices in the drug and dietary supplement industries including Average Wholesale Price Litigation, the First Databank/McKesson Pricing Fraud Litigation and the Enzyte Litigation
  • Key member of the firm’s automobile defect litigation team


  • In 2014, Public Justice nominated Mr. Matt and the In re Toyota Motor Corp. Sudden, Unintended Acceleration team for their work in securing a $1.6 billion settlement of car owners.

Notable Cases

  • In re Charles Schwab Securities Litigation ($235 million settlement)
  • In re Oppenheimer Champion Income Fund Securities Fraud Class Actions ($52.5 million proposed settlement)
  • Oppenheimer Core Bond Fund Class Action Litigation ($47.5 million settlement)
  • Morrison Knudsen and Costco Wholesale Corp. Securities Litigation
  • In re Pharmaceutical Industry Average Wholesale Price Litigation($338 million settlement)
  • In re Toyota Motor Corp. Unintended Acceleration Marketing, Sales Practices, and Products Liability Litigation
  • In re Checking Account Overdraft cases pending against many of the country’s largest banks
  • Washington State Ferry Litigation, which resulted in one of the most favorable settlements in class litigation in the history of the state of Washington
  • Microsoft Consumer Antitrust cases
  • State Attorneys General Tobacco Litigation, assisted with client liaison responsibilities, working closely with assistant attorneys general in Oregon, Ohio, Arizona, Alaska and New York, as well as assisting in all litigation matters


  • "Providing a Model Responsive to the Needs of Small Businesses at Formation: A Focus on Ex Ante Flexibility and Predictability," 71 Oregon Law Review 631, 1992