Jason A. Zweig

Mr. Zweig was a key member in the High Fructose Corn Syrup Antitrust Litigation which resulted in a $531 million recovery—one of the largest antitrust and securities class actions in history.
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Current Role

  • Partner, Hagens Berman Sobol Shapiro LLP
  • Works at the firm's Chicago and New York offices
  • Extensively experienced in representing plaintiffs in antitrust, securities, consumer and other complex litigation
  • Experience representing large entities in opt-out litigation, as well as plaintiffs in class-action litigation
  • Currently representing the City of Newark, New Jersey in Federal price-fixing antitrust litigation involving wastewater treatment chemical liquid aluminum sulfate
  • Representing New Jersey municipalities in class-action litigation against artificial turf manufacturer for sales of defective turf
  • Key member in some of the largest antitrust and securities class actions in history including the High Fructose Corn Syrup Antitrust Litigation which resulted in a $531 million recovery
  • Led the firm’s representation of merchants who opted out of the class in In re Payment Card Interchange Fee and Merchant Discount Litigation, MDL No. 1720 (E.D.N.Y.), including American Airlines, Southwest Airlines, Alaska Airlines, JetBlue, British Airways, Hawaiian Airlines, DSW and Bloomin’ Brands
  • Leads the firm’s efforts in the New Jersey Tax Sales Certificates Antitrust Litigation, an antitrust class action in which the firm has been appointed co-interim class counsel (more than $9.6 million recovered)
  • Co-led the firm’s representation of payphone owners who sued a large national telecommunications carrier over unpaid dial-around compensation


  • Partner, Kaplan Fox & Kilsheimer LLP in New York, 2003-2010
  • Associate, Proskauer Rose LLP in New York where he practiced in all areas of civil and criminal litigation
  • Judicial intern to the Honorable Jed S. Rakoff, U.S. District Court Judge for the Southern District of New York

Legal Activities

  • The Chicago Bar Association, Vice-Chair of the Class Action Committee
  • Federal Bar Association
  • The American Bar Association Sections of Litigation, Antitrust Law and International Law
  • Advisory Board of the Cartel and Criminal Practice Committee of the ABA Section of Antitrust Law
  • The New York State Bar Association
  • The Indiana University Student Foundation Board of Associates
  • Former member of the Jewish Board of Family and Children’s Services, Children & Adolescents in Residence Divisional Board
  • Former Co-Chair of the Young Lawyer’s Division of the UJA Federation-New York


  • Rising Star, New York Super Lawyers Magazine, 2011 & 2013

Notable Cases

  • Hill v. J.P. Morgan - Madoff-related Litigation ($218 million recovered)
  • High Fructose Corn Syrup Antitrust Litigation ($531 million recovered)
  • In re Air Cargo Antitrust Litigation (Over $1 billion recovered—case still pending)
  • In re Polyether Polyols Antitrust Litigation (Over $150 million recovered)
  • Hydrogen Peroxide Antitrust Litigation ($97 million recovered)
  • Plastics Additives Antitrust Litigation ($46 million recovered)
  • NBR Antitrust Litigation ($34 million recovered)
  • Linens Antitrust Litigation ($11 million recovered)
  • In re Merrill Lynch & Co., Inc. Securities, Derivative & ERISA Litigation($475 million recovered)
  • Merrill Lynch Research Reports Securities Litigation ($125 million recovered)
  • Salomon Analyst Metromedia Litigation ($35 million recovered)


  • American Bar Association, Class Action Institute, October 2017, Washington, D.C., Considerations regarding whether to opt-out of a class-action.
  • Chair of the Harris Martin Herbal Supplements Conference, May 2015, Minneapolis, Minnesota
  • “Class Actions in the Wake of AT&T v. Concepcion,” Presentation to the New Jersey Association for Justice November 2011
  • “Class Action Settlements and Attorneys’ Fees,” Presentation to the Cleveland Metropolitan Bar Association, October 2008

Personal Insight

Outside of the office, Mr. Zweig engages in a daily practice of Transcendental Meditation to stay sharp and focused. Mr. Zweig also volunteers his time to assist U.S. veterans before the Department of Veterans Affairs.