UK Tribunal Orders Large Publishers Into Disclosure in £13.6bn Google Ad Tech Claim
The UK's Competition Appeal Tribunal has ruled that major corporate class members in the £13.6 billion Ad Tech Collective Action against Google can be compelled to participate actively in the litigation, a decision that reshapes expectations about what "passive" membership in a funded class action entails. The funded claim alleges that Google abused its dominance across the advertising-technology supply chain to the detriment of online publishers.
As reported by Tech Times, the Tribunal drew a deliberate line between small, genuinely passive beneficiaries and large institutional publishers with the resources and organizational capacity to produce relevant documents. For the latter group, the ruling holds, class membership is not a shield against disclosure obligations — they may be required to contribute to the evidentiary record despite not being named claimants.
The action is brought by Ad Tech Collective Action LLP, led by former Ofcom director Claudio Pollack, and is backed by a subsidiary of litigation funder Fortress, meaning class members bear no direct financial risk. The claim is represented by Hausfeld, Humphries Kerstetter, and Geradin Partners.
The decision matters for the economics of large funded opt-out claims: greater disclosure burdens on sizeable class members could affect case management, cost, and participation incentives in future collective actions. The Tribunal has listed the trial for September 2028, with a hearing expected to run twelve weeks.







