Class Action
Amazon Consumer Antitrust / Algorithmic Pricing
Re-checked against the docket 2026-08-23
De Coster, et al. v. Amazon.com, Inc.
Where it stands
Judge John H. Chun certified a class on August 6, 2025 (order initially sealed; public redacted version September 2025): U.S. consumers who bought five or more new physical goods from third-party sellers on Amazon's marketplace on or after May 26, 2017. Plaintiffs' expert estimates roughly 300 million consumers and about 34 billion transactions. Amazon's Rule 23(f) petition was denied by the Ninth Circuit on September 24, 2025. The notice plan was approved March 30, 2026, notice began June 1, 2026, and the exclusion deadline was August 31, 2026.
Key ruling
August 6, 2025: class certified. November 19, 2024: motion to dismiss denied.
The record
- Court
- U.S. District Court for the Western District of Washington
- Case number
- 2:21-cv-00693-JHC
- Filed
- 2021-05-26
- Defendants
- Amazon.com, Inc.
- Plaintiffs
- Certified class: 'All persons in the United States who, on or after May 26, 2017, purchased five or more new, physical goods from third-party sellers on Amazon's marketplace' (approximately 288 million consumers)
- Technology at issue
- Amazon marketplace pricing systems, Buy Box algorithm, and price-parity/anti-discounting policies
- Relief sought
- Treble damages and injunctive relief under Sherman Act §§ 1 and 2 and Washington consumer-protection law
- Counsel of record
- Hagens Berman Sobol Shapiro LLP
Claims pleaded
Sources (4)
- Amazon.com Antitrust Class Action (De Coster)Hagens Berman Sobol Shapiro LLP · 2026-06-01
- De Coster et al. v. Amazon — Frequently Asked QuestionsCourt-approved class notice administrator · 2026-06-01
- Amazon algorithm juiced prices, cost US consumers $1 billion, new FTC lawsuit documents allegeCNN Business · 2023-11-02
- De Coster v. Amazon.com, Inc. — docketCourtListener · 2026-06-01
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