Google Keeps AdX As The Court Chooses Conduct Over Breakup
Google will keep AdX. A US federal court has rejected the Department of Justice's demand that the company divest its advertising exchange, opting instead for behavioural remedies.
- Court: US District Judge Leonie Brinkema, Alexandria, Virginia
- Rejected: the DOJ's push to force a sale of AdX, the exchange through which publishers offer inventory in real-time auctions
- Ordered instead: behavioural remedies aimed at the competition concerns identified in the case
- Background: Brinkema's April 2025 finding that Google unlawfully maintained monopolies in publisher ad servers and ad exchanges
- Still to come: a detailed version of the ruling, once confidential information is removed
What Google Was Found To Have Done
The liability finding still stands, and it is worth separating from the remedy. In April 2025 the court concluded that Google had unlawfully maintained monopolies in key parts of the digital advertising technology stack, and that tying its publisher ad server to AdX had limited competition and disadvantaged rival adtech providers and publishers.
The remedies phase then became a single argument: whether restrictions on conduct would be enough, or whether the assets had to be separated. The court has answered the first way.
Why That Answer Matters To Publishers
Structural separation is a one-time event that changes who owns what. Behavioural remedies are ongoing obligations that require monitoring, interpretation and enforcement, and their effectiveness depends entirely on how tightly they are drawn and how closely they are policed.
For publishers and rival adtech firms, the practical question is whether the ordered conduct changes actually alter the economics of routing inventory through Google's stack, or simply document them. That will not be answerable until the detailed ruling is published. More from ad tech.
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