Rio Pierce
Hagens Berman Sobol Shapiro LLP
Recognized since 2024
Berkeley, California
Mass Tort Litigation / Class Actions - Plaintiffs
Rio focuses his practice on enforcing antitrust laws and ensuring fair and free markets for the benefit of consumers.
CURRENT ROLE
- Partner, Hagens Berman Sobol Shapiro LLP
RECENT SUCCESS
- In re Broiler Chicken Antitrust Litig., No. 16-CV-08637 (N.D. Ill.), part of team at Hagens Berman for indirect purchaser class; recovery to date of $106 million
- In re Pork Antitrust Litig., No. 18-CV-01776 (D. Minn.), part of team at Hagens Berman serving as co-lead counsel for indirect purchaser class; recovery to date of $109.4 million; Litigation ongoing
- Qualcomm Antitrust Litig., No. 5:17-md-02773 (N.D. Cal.), part of team at Hagens Berman acting as counsel for indirect purchaser class that resulted in certified class of hundreds of millions of consumers
- In re Optical Disk Drive Antitrust Litig., No. 10-md-02143 (N.D. Cal.), team at Hagens Berman acting as lead counsel for indirect purchaser class; recovery of $205 million
EXPERIENCE
- Prior to joining Hagens Berman, worked as an associate for two years at Munger, Tolles & Olson, where he gained significant experience in class action and complex commercial litigation. Mr. Pierce also did extensive pro bono work on immigration matters
- Law Clerk, U.S. Court of Appeals for the Ninth Circuit, Judge Jerome Farris, 2013-2014
- Associate, Munger Tolles & Olson, 2014-2016
- E-mail: riop@hbsslaw.com
- Direct Phone Number: 510-725-3000
- Phone Number: 510-725-3000
- Lawyer Page: https://www.hbsslaw.com/attorneys/rio-pierce
- 715 Hearst Avenue, Suite 300
Berkeley, CA 94710
- Harvard University, J.D., graduated 2013
6 The Best Lawyers in America® awards
3 Best Lawyers: Ones to Watch® in America awards

- Mass Tort Litigation / Class Actions - Plaintiffs
Antitrust Enforcement Award Honoree, American Antitrust Institute, 2024
500 Leading Lawyers in America, Plaintiff Financial Lawyers, Lawdragon, 2024-2025
Top 40 Under 40 Civil Plaintiff Trial Lawyers in California, The National Trial Lawyers, 2021
Chayes Fellow, National Prosecuting Authority in Cape Town, South Africa
Teaching Fellow, Copyright EdX
- Technology Law
- Litigation - Antitrust
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