Welcome to the De Coster et al. v. Amazon.com, Inc. Class Action Website
A lawsuit is pending in the United States District Court for the Western District of Washington (the “Court”) against Amazon.com, Inc. (“Amazon”). The lawsuit alleges that Amazon violated federal antitrust laws by using its market power to impose and enforce an anti-discounting policy on third-party sellers that allowed for inflated commission fees and caused higher consumer prices. Third-party sellers are businesses that sell goods directly to consumers through Amazon’s marketplace, as opposed to goods sold directly by Amazon itself.
Plaintiffs say that Amazon’s enforcement of its anti-discounting policy prevents third-party sellers from offering lower prices for their goods on competing platforms. Plaintiffs say that these policies have anticompetitive effects because they eliminate competition among and across United States online retail marketplaces.
Plaintiffs contend that they, and the class of consumers they represent, have been harmed by Amazon’s actions because they paid more for goods on Amazon’s Marketplace than they would have paid absent Amazon’s allegedly anticompetitive conduct. Specifically, Plaintiffs claim that Amazon violated the Sherman Act, 15 U.S.C. § 1 et seq.
On August 6, 2025, the Court certified a Class for purposes of litigating the merits of the case, and appointed Hagens Berman Sobol Shapiro LLP, Keller Postman LLC, and Quinn Emanuel Urquhart & Sullivan LLP to represent the Class (“Class Counsel”).
Amazon denies any wrongdoing, and the Court has not yet decided whether Amazon did anything wrong.
Your legal rights are affected whether you act or don’t act. These rights and options — and the deadlines to exercise them — are explained in this notice. Please read this notice carefully.
