Stephenson Harwood acts for the Association of Consumer Support Organisations in a competition class action against Amazon

Law firm Stephenson Harwood LLP is acting for the Association of Consumer Support Organisations (ACSO) in its proposed collective proceedings against Amazon.

ACSO recently filed its claim against Amazon on behalf of more than 45 million UK consumers who purchased products on Amazon between August 2019 and August 2025.

ACSO alleges that Amazon prevents third-party sellers from offering lower prices for their products elsewhere on the internet. Amazon's price parity policies protect Amazon from healthy price competition from other e-commerce platforms, leading to higher prices for UK consumers.

“Amazon appears to have circumvented previous regulatory interventions targeting its pricing policies and is now implementing policies which we contend are anti-competitive, to the detriment of UK consumers,” said Genevieve Quierin, Partner and Head of the Group Actions and Competition team at Stephenson Harwood. “We are committed to securing compensation for the millions of consumers who have been affected by Amazon's alleged anti-competitive conduct.”

Stephenson Harwood's work on this landmark class action against Amazon further demonstrates the firm’s depth of expertise in competition law and complex group actions.

The team is led by Partners Genevieve Quierin and Tim Knight, who are supported by Consultant Alex Athanasopoulos, and Associate Katelyn Iacono, and Trainees Jay Kim and Mikaela Hristova of Stephenson Harwood's Group Actions and Competition team.

Alongside Stephenson Harwood, ACSO has instructed Ben Lask KC, Luke Kelly and Jenn Lawrence of Monckton Chambers as well as The Brattle Group in support of the proceedings.

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