Key Takeaways
- The UK Competition Appeal Tribunal rejected Google’s attempt to block a large‑scale class‑action lawsuit brought by advertisers.
- The tribunal certified the proceedings on an opt‑out basis, meaning all eligible advertisers are automatically included unless they actively choose to exclude themselves.
- Google’s objections concerning funding arrangements, cost levels, proposed amendments to the claim form, class definition, and the opt‑in/opt‑out mechanism were deemed insufficient to halt certification.
- The suit represents roughly 880,000 British firms and seeks up to £5 billion (≈ $6.7 billion) in damages for alleged over‑charging and anti‑competitive conduct.
- Allegations centre on Google’s deals that pre‑install its Search app and Chrome on Android devices and payments to Apple to make Google the default search engine on iPhones, which the claim argues stifles rival search engines and ad providers.
- Google dismissed the case as “speculative and opportunistic,” maintaining that advertisers choose its services because they are helpful, not because alternatives are lacking.
Tribunal Allows Class Action to Move Forward
The Competition Appeal Tribunal (CAT) delivered a reasoned judgment on Wednesday, August 5, refusing Google’s request to stall a class‑action lawsuit filed by UK advertisers. The tribunal’s decision permits the case to proceed to substantive hearings, marking a significant procedural victory for the claimants who allege that Google abused its dominance across mobile operating systems, app distribution, search, and search advertising to inflate advertising costs and squeeze out rivals.
Basis for Certification Decision
In its summary, the CAT explained that it considered several procedural hurdles raised by Google before deciding on certification. The tribunal examined the claim representative’s funding arrangements, the proposed level of costs, requested amendments to the claim form, the precise definition of the class, and whether the suit should operate on an opt‑in or opt‑out basis. After weighing these factors, the tribunal concluded that none of the objections constituted a legal barrier to certification.
Google’s Specific Objections Overruled
Google had argued that the claim representative’s funding structure and anticipated costs were too uncertain to allow the case to proceed, sought to block amendments to the claim form that would refine the allegations, challenged the scope of the class definition, and insisted that an opt‑in model was more appropriate. The tribunal rejected each of these points, finding that the funding arrangements were adequate, that cost levels did not disqualify the claim, that amendments could be addressed later, and that the class definition could be refined as the litigation advances.
Opt‑Out Certification Chosen
Crucially, the tribunal determined that the proceedings should be certified on an opt‑out basis. Under this model, all advertisers meeting the class criteria are automatically part of the lawsuit unless they take affirmative steps to exclude themselves. This approach maximizes the potential reach of the claim and places the burden on individuals who wish to opt out, rather than requiring each potential claimant to affirmatively join the suit. The tribunal emphasized that opt‑out certification is appropriate when the class is sufficiently defined and the issues are common to all members.
Scale of the Claim
According to Bloomberg’s reporting, the class action purports to represent approximately 880,000 British businesses. The claimants are seeking damages amounting to as much as £5 billion, which translates to roughly $6.7 billion at current exchange rates. This figure reflects the alleged over‑charge that advertisers suffered due to Google’s purported anti‑competitive behavior, as well as any consequential losses stemming from reduced competition in the search and advertising markets.
Alleged Anti‑Competitive Conduct
The core of the lawsuit rests on accusations that Google leveraged its market power to foreclose rivals. Specifically, the claim alleges that Google entered into agreements with mobile device manufacturers to have its Search app and Chrome browser pre‑installed on Android smartphones. Additionally, it asserts that Google paid Apple substantial sums to secure the position of default search engine on iPhones. These arrangements, according to the advertisers, effectively limited consumer choice and prevented alternative search engines and advertising platforms from gaining meaningful traction.
Effect on Market Competition
By ensuring that its own services are the default or pre‑loaded options on the vast majority of mobile devices, Google allegedly curtailed the ability of competing search engines to reach users. The claim argues that this conduct reinforced Google’s dominance in both the search market and the associated search‑advertising market, allowing the company to set advertising terms without meaningful competitive pressure. Consequently, rival ad networks struggled to achieve scale, which further entrenched Google’s market position.
Financial Impact on Advertisers
The plaintiffs contend that Google’s dominance enabled it to charge advertisers inflated prices for search advertisements. Because advertisers had limited viable alternatives for reaching mobile users, they allegedly paid supra‑competitive rates for ad placements. The lawsuit seeks to recover these excess payments, asserting that the over‑charges constitute a direct financial harm to the class of UK businesses that rely on search advertising to promote their products and services.
Google’s Response and Outlook
Google has not issued an immediate comment on the tribunal’s ruling, but earlier statements characterizing the lawsuit as “yet another speculative and opportunistic case” indicate the company’s intention to defend itself vigorously. A Google spokesperson emphasized that advertisers and users choose Google’s services because they find them helpful, not because there are no alternatives. As the case progresses, both sides will likely present extensive economic and technical evidence to substantiate or refute the allegations of anti‑competitive behavior and resulting damages. The outcome could have far‑reaching implications for how digital platforms interact with device makers and for the regulation of dominant online advertising ecosystems in the United Kingdom and beyond.

