Court declines to force Google^[1] to sell its AdX advertising exchange

The court's decision

Judge Leonie Brinkema declined to force Google to sell AdX, although she had previously found unlawful monopolisation of the publisher ad server and advertising exchange markets. Instead of a structural breakup, the court chose behavioural remedies intended to change the platform's conduct without transferring the exchange to a new owner. [1 · Reuters]

Google's proposals under discussion included giving competitors access to bids in real time. The full ruling is due to appear after confidential details are removed. Until it is published, the timelines, technical requirements, enforcement arrangements and actual opportunities for independent adtech companies cannot be fully assessed. [1 · Reuters]

Why the market structure remains

For independent adtech companies, behavioural remedies could improve access to bids and reduce some of Google's informational advantages. But AdX retains the same owner, so the ruling does not create a new independent decision-making centre or reshape the market as radically as a forced sale. [1 · Reuters]

The effectiveness of behavioural remedies depends on precise wording and the ability to verify technical compliance. If access is formally provided but comes with delays, limited data or less convenient interfaces, the competitive effect could be small. The full ruling and subsequent oversight of its implementation will therefore be critical. [1 · Reuters]

The risk of dependence on a single platform

The case shows that even an established antitrust violation does not guarantee a platform's structural breakup. Publishers and advertising companies still need to maintain their own audiences, audience data and alternative distribution channels. A regulatory decision can improve access terms, but does not eliminate dependence on dominant infrastructure. [1 · Reuters]