Rightmove’s £1.6B Antitrust Headache: The Rising Tide of UK Class Actions
A £1.6 billion opt-out claim against Rightmove highlights the escalating litigation risks and exposure that digital platforms face regarding their pricing strategies in the United Kingdom.
On April 16, 2026, the UK Competition Appeal Tribunal published further details of a significant new collective proceedings claim against Rightmove plc and Rightmove Group Limited. Brought on an "opt-out" basis, the £1.6 billion (approx. $2.2 billion) claim highlights the escalating litigation risks for digital platforms and potentially dominant service providers in the United Kingdom.
Under UK (and EU) competition law, holding a dominant position is not inherently unlawful. However, a dominant firm is prohibited from abusing that position to the detriment of consumers or competitors. Such abuse typically falls into two categories: exploitative conduct, such as charging unfair or excessive prices, and exclusionary conduct, which prevents rivals from effectively competing.
This claim asserts that Rightmove has engaged in both, alleging that the company abused its dominance in the "property portal services market" of Great Britain by employing exclusionary tactics that diminished the use and appeal of rival platforms. The claimant argues that such reduced competition allowed Rightmove to charge unfair and excessive fees to its subscribers.
The action seeks aggregate damages on behalf of an estimated 7,200 members who paid for Rightmove's services over a six-year period—primarily small businesses such as estate agents, letting agents, and new homes developers.
Crucially, the action is proposed as an "opt-out" claim, meaning that all eligible customers are automatically included in the lawsuit unless they explicitly choose to leave. This is in contrast to an "opt-in" model, which would require them to actively join. The claimant argues that an opt-out approach is necessary because three main factors would deter claimants from actively opting in: the complexity of competition litigation, the relatively modest individual recoveries, and the commercial fear of retaliatory action from a "must-have" business partner. Capturing the entire class also makes funding the litigation more economically attractive despite the relatively modest individual recoveries.
For businesses operating digital platforms, this case serves as a critical reminder of the scrutiny applied to pricing strategies and platform terms. The continued expansion of the United Kingdom's "opt-out" regime means that aggressive market conduct can now rapidly translate into significant class action exposure, driven by sophisticated representatives and litigation funders.
