Amazon , the global e-commerce powerhouse, is once again under scrutiny, this time in the UK.
On 14 August 2025 , the Association of Consumer Support Organisations (ACSO) filed a collective lawsuit with the UK’s Competition Appeal Tribunal, representing millions of shoppers and alleging violations of competition law that may have resulted in widespread overcharging.
consumers. The allegations span a six-year period from August 2019 to August 2025, during which ACSO argues customers were forced to pay inflated prices when purchasing from third-party sellers on Amazon’s marketplace.
Allegations of Anti-Competitive Conduct At the heart of the lawsuit is the claim that Amazon’s price-parity policies restrict third-party sellers from offering lower prices for their products on alternative online platforms. In practice, ACSO argues, this prevents fair competition across the e-commerce marketplace.
By limiting sellers, Amazon allegedly shields itself from competitors who might otherwise undercut its prices, resulting in a less competitive environment that ultimately disadvantages consumers.
If upheld, the claim could entitle affected shoppers to significant reimbursement for excess costs they paid during this six-year window. ACSO founder and executive director Matthew Maxwell-Scott highlighted the gravity of the case: “Millions of people in the UK make purchases on Amazon every day…
