Google will not be forced to sell off its advertising exchange, but it will have to change how that business operates. US District Judge Leonie Brinkema handed down her remedies decision in early September 2026, following an April 2025 finding that Google had operated an illegal monopoly in advertising technology. The Google ad tech antitrust ruling rejected the government’s push for a breakup while still ordering what AdExchanger described as “most of the parties’ proposed behavioral remedies.”
The Google ad tech antitrust ruling: what the judge rejected
The Department of Justice, joined by 17 states in a case first brought in January 2023, had pushed for Google to divest AdX, its ad exchange, and potentially DFP, its publisher ad server, both of which sit inside the Google Ad Manager suite. According to a summary from ValueAddVC, Brinkema also rejected a proposal to open-source DFP’s final auction logic and a contingent spinoff plan the DOJ had called the “DFP Remainder.” A structural breakup of that scale would have been one of the most significant antitrust remedies against a major tech company in decades, and its absence means Google keeps full ownership of the pieces that make up its ad tech stack. Notably, this is the second time in roughly a year that Google has avoided a structural remedy after a monopoly finding, following a similar outcome in its search antitrust case.
What Google will reportedly have to change
Instead of a breakup, the ruling leans on behavioral fixes, several of which mirror proposals Google itself had floated. Those include making real-time bid amounts for open web display ads sold through AdX visible to rival ad servers, which would let competitors see pricing information they currently can’t access. Google has also proposed phasing out its Unified Pricing Rules, a policy that currently requires publishers to set a single price floor across different bidders; ending it would let publishers set different floors for individual bidders in Google Ad Manager. A third change involves giving up so-called “first look” and “last look” privileges, bidding advantages that have let Google’s own exchange adjust open web display bids in ways rivals couldn’t match.
Separately, critics of Google’s ad tech dominance have pushed for AdX to be integrated into Prebid.org, an independent, publisher-governed header bidding system. Google has signalled support for that idea, though it remains unclear whether the court’s order actually requires it, since the full ruling had not been made public as of the September reporting.
Why the distinction between structural and behavioral remedies matters
A structural remedy, like a forced divestiture, permanently changes who owns what. A behavioral remedy instead changes how a company is allowed to operate while it keeps its existing structure, which means enforcement and monitoring become the real test of whether anything actually changes for competitors. Google remains bound to comply with whatever final behavioral remedies the court lays out, but the practical impact on rival ad servers and publishers will depend heavily on how strictly those rules are enforced once they take effect.
What comes next for Google’s ad business
At the time AdExchanger reported on the preview filing, the full scope of the ruling had not yet been made public. Both sides must submit a jointly proposed final judgment setting out the exact required practices within 30 days of the ruling, according to ValueAddVC’s reporting, and Google has reportedly signaled it will challenge even the behavioral remedies it was handed, raising the prospect of years of further appeals before anything changes for publishers and rival ad tech firms.
Frequently asked questions
Did Google have to break up its ad business?
No. US District Judge Leonie Brinkema rejected the Department of Justice’s proposal that Google divest its AdX ad exchange and possibly its DFP ad server. Instead, she ordered Google to change how it runs the business through behavioral remedies.
What is the Google ad tech antitrust ruling actually about?
It follows an April 2025 federal court finding that Google operated an illegal monopoly in ad tech. Judge Brinkema’s September 2026 ruling decided what remedies should follow that finding, choosing operational reforms over a forced breakup.
What changes is Google expected to make to AdX?
Google has proposed making real-time bid amounts for open web display ads sold through AdX available to rival ad servers, phasing out its Unified Pricing Rules so publishers can set different price floors for different bidders, and dropping its “first look” and “last look” bidding advantages.
Has the full ruling been made public?
As of the reporting in September 2026, only a preview of the decision had been released. The full scope of the required remedies, and whether Google will appeal, had not been confirmed.
Why does this ruling matter for publishers and advertisers?
Behavioral remedies aimed at AdX and Google Ad Manager could change how fairly rival ad servers can compete for the same inventory, which affects how much publishers earn from ad space and how efficiently advertisers can buy it.
Is this the same case as Google’s search antitrust ruling?
No. This case concerns Google’s advertising technology business specifically, decided by Judge Brinkema in Virginia federal court, and is separate from other antitrust cases Google has faced over its search and app store businesses.
For related coverage of how regulators are treating major tech platforms, see our reports on the EU AI Act’s new enforcement powers and Apple’s trade secrets win against OpenAI.
