Creative Representation | Expert Litigation

Contact Information

Main: 415.956.1900

Direct: 415.291.4505

Fax: 415.956.1152


LinkedIn: Jason A. Zweig



Columbia Law School, J.D., 1998

Indiana University, B.S. (Public Affairs), 1995

Bar Admissions

State Bar of Illinois, 2015

State Bar of New York, 1999

U.S. Court of Appeals for the Second Circuit, 2006

U.S. Court of Appeals for the Third Circuit, 2001

U.S. Court of Appeals for the Ninth Circuit, 2020

U.S. District Court, Southern District of New York, 2000

U.S. District Court, Eastern District of New York, 2000

U.S. District Court, Eastern District of Michigan, 2011

U.S. District Court, Eastern District of Wisconsin, 2010


Lawdragon, 500 Leading Plaintiff Financial Lawyers (2021-present)

Illinois Super Lawyers (2021-present)

National Trial Lawyers Top 100 (2021-2022)

Presentations / Publications

Class Action Settlements and Attorneys Fees

Presentation to the Cleveland Metropolitan Bar Association

Class Actions in the Wake of AT&T v. Concepcion

Presentation to the New Jersey Association for Justice on November 11, 2011

Whether and When to Opt-Out

2015 ABA National Class Action Institute, Washington, D.C.

"COVID Cases, Who’s Phishing and Who’s Legit”

American Bar Association, Class Action Institute, October 2020 (Virtual)


Jason Zweig is a Principal of the firm. He is an experienced litigator with 25 years of experience representing both plaintiffs and defendants in a variety of complex litigation. Jason’s experience includes representing plaintiffs and defendants in antitrust, securities, consumer fraud, insurance, and business litigation. In particular, Jason has extensive experience representing entities that opt-out from class actions and seek to bring their own claim. Jason has represented clients in both state and federal courts, as well as arbitral forums.

Prior to joining Bartko, Jason was a partner at Keller Postman LLC (f/k/a Keller Lenkner LLC), where he focused primarily on class action and mass tort matters, as well as the representation of opt-outs. Prior to Keller Postman, Jason was the managing partner of the Chicago office of Hagens Berman Sobol Shapiro LLP, where he specialized in representing plaintiffs in antitrust and securities class-action litigation, as well as large corporations as opt-outs from class-action litigation. Jason was also a partner at Kaplan Fox & Kilsheimer LLP in New York, where he represented plaintiffs in antitrust, securities, and consumer fraud litigation. Prior to Kaplan Fox, Jason was an associate at Proskauer Rose LLP in New York where he represented defendants in antitrust and securities litigation, and plaintiffs in insurance coverage matters. During law school, Jason served as a judicial intern to the Honorable Jed. S. Rakoff, United States District Judge for the Southern District of New York.

Jason is extremely involved in both his professional and personal community. He is a current member of the Indiana University Student Foundation Board of Associates. Jason is also a member of the Board of Trustees of Am Shalom in Glencoe, Illinois. He has also been involved in numerous bar associations, and held leadership roles in those bar associations, including Chairing the Class Action Committee of the Chicago Bar Association. Jason also believes in serving those who have served us – our nation’s veterans – including volunteering some of his time to assist veterans in pro bono matters.

Representative Matters

Alaska Air Group, Inc. et al. v. Anthem, Inc. et al., 2:21-cv-01209 (N.D. Ala.) and JetBlue Airways Corp. et al. v. Anthem et al., 2:22-00558 (N.D. Ala.)

Jason is currently representing Alaska Airlines, American Electric Power, Big Lots, BNSF Railway, FedEx, JetBlue, and McLane Company, as opt-outs from the class settlement in In re Blue Cross Blue Shield Antitrust Litig., 13-cv-20000 (N.D. Ala.). The plaintiffs allege that the Blue Cross Blue Shield Association, and its independent member insurance companies, have engaged in an illegal market and customer allocation in violation of Section One of the Sherman Act.

In re Google Digital Advertising Antitrust Litig., 21-md-3010 (S.D.N.Y.)

Jason represented the Attorneys General of Texas, Idaho, Indiana, Mississippi, North Dakota, South Carolina, and South Dakota, in an enforcement action alleging that Google monopolized the markets involved in web display advertising in violation of Section Two of the Sherman Act and various deceptive trade practice statutes. The case is ongoing.

In re Payment Card Interchange Fee and Merchant Discount Litigation, MDL No. 1720.

Jason represented Alaska Airlines, American Airlines, British Airways, DSW, FedEx, Hawaiian Airlines, JetBlue, SafeAuto Insurance, Southwest Airlines, and The Minnesota Twins as opt-outs from the class-action settlement. The plaintiffs alleged that Visa and MasterCard’s rules imposed on merchants violated Sections One and Two of the Sherman Act. The case resolved for a confidential amount.

In re New Jersey Tax Sales Certificates Antitrust Litig., 3:12-CV-01893 (D.N.J.)(Shipp, J.)

Jason was court-appointed, co-lead counsel representing a class of New Jersey foreclosed homeowners who were the victims of a bid-rigging conspiracy among purchasers of tax sale certificates in New Jersey in violation of Section One of the Sherman Act and various New Jersey state laws. The case resolved successfully for over $10 million.

Paul Shapiro et al. v. JP Morgan Chase & Co. et al., 11-CV-8331 (S.D.N.Y.)

Jason represented a class of investors who lost money with Bernard Madoff when Madoff’s Ponzi scheme was revealed. The class alleged that J.P. Morgan aided and abetted Madoff’s fraud in violation of various state laws. The case resolved successfully for $218 million.

The 2001 Bentley Family Trust and Jennifer Bentley v. United of Omaha Life Insurance Ins. Co., 15-CV-7870 (C.D. Cal.)(Gee, J.)

Jason was court appointed co-lead counsel representing a class of life insurance policyholders who had their life insurance policies terminated in violation of California law. The plaintiffs prevailed on summary judgment, and the case resolved successfully with each class member receiving nearly 100% of their policy limits.

In re High Fructose Corn Syrup Litig., 95-1477 (C.D. Ill.)(Mihm, J.)

Jason was involved in representing a class of purchasers of high fructose corn syrup, including being part of the trial team. The class alleged that the manufacturers of high fructose corn syrup conspired to raise prices in violation of Section One of the Sherman Act. The case resolved successfully for $531 million.

In re Urethane Antitrust Litig., 04-MD-1616 (D. Kan.)(Lungstrum, J.)

Jason was involved in representing a class of purchasers of various chemicals used in the manufacturing of foam. Plaintiffs alleged that defendants conspired to fix the prices of those products in violation of Section One of the Sherman Act. Ultimately, the case resolved successfully for over $1 billion, after one defendant decided to go to trial and lost. The jury returned a verdict of nearly $1 billion with trebling.

In re Air Cargo Shipping Antitrust Litigation, 06-MD-1775 (E.D.N.Y.)

Jason was involved in representing a class of purchasers of air cargo services from various airlines. The class alleged that these airlines colluded to fix fuel surcharges in violation of Section One of the Sherman Act. The case resolved successfully for over $1 billion.

Fraser v. Major League Soccer

Jason was involved in defending Major League Soccer in an antitrust action brought by MLS players alleging that MLS violated Section One of the Sherman Act. MLS prevailed after the First Circuit Court of Appeals concluded that MLS was a single entity incapable of conspiring.

Jason also has experience in international matters, including being involved in an international securities litigation case in Australia.

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