A class action is underway against Amazon, as nearly 300 million consumers seek justice for what they claim are artificially inflated prices caused by Amazon’s anti-discount policy imposed on marketplace merchants.

Class Certification and Consumer Reach

Consumers, led by attorneys Steve Berman of Hagens Berman Sobol Shapiro LLP and a coalition including Quinn Emanuel Urquhart & Sullivan LLP and Keller Postman LLC, asked a Washington federal judge to certify a class comprising 288 million customers who made tens of billions of purchases from over 2.5 million third-party sellers from May 2017 onward.

This sprawling class action—De Coster, et al. v. Amazon.com Inc., Case No. 2:21-cv-00693, U.S. District Court for the Western District of Washington—is now recognized as one of the largest ever certified in U.S. https://www.hbsslaw.com/press/amazoncom-antitrust-de-coster/judge-certifies-largest-class-in-us-history-in-consumer-antitrust-lawsuit-against-amazon. Judge John Chun unsealed his class-certifying order on September 2, 2025 and commented, The court finds that plaintiffs have met their burden regarding commonality,…