Google is facing a £3 billion legal claim alleging it monopolises the display advertising market, according to multiple UK reports. The action is brought by AGC Collective Actions Limited, which is represented by KP Law. The claimant has filed an application for proceedings with the UK Competition Appeal Tribunal (CAT), the specialist forum for competition-law cases. The sources describe the claim as seeking damages tied to alleged anti-competitive conduct in the display ads sector. While the reports detail the parties and the amount sought, they do not provide further case specifics such as the precise conduct alleged beyond the allegation of monopolising the market. The filing of an application is an early procedural step; the sources do not indicate that the CAT has yet accepted the claim for full proceedings, nor do they outline Google’s response. The matter is therefore at the stage of initiating legal action before the tribunal, with arguments and evidence yet to be considered through the formal competition-appeal process.