On September 2, 2026, U.S. District Judge Leonie Brinkema rejected the Justice Department’s request to force Google to sell its AdX advertising exchange, choosing conduct-based remedies instead. Google keeps the exchange, but the court required changes to auction access and publisher relationships after finding that the company had unlawfully harmed competition in important online advertising markets. [1] [4]
The detailed remedy decision, unsealed on September 16, shows the current status: Google must open specified connections to rival tools, share publisher data, avoid discriminatory bidding and operate under a monitor and technical committee for six years. The court did not order a divestiture, and Google said it would appeal part of the liability decision; the Justice Department said it was reviewing its options. [2] [3]
Key points
- AdX stays inside Google. The court rejected the government’s structural remedy of selling the exchange. [1] [2]
- Access must widen. Google must support integrations between AdX, its publisher ad server and Prebid, and send real-time bids to other publisher ad servers. [3]
- Publishers gain data rights. They must be able to access and export their own data from Google’s DFP and AdX products. [3]
- Google’s buying tools face limits. AdWords cannot bid preferentially into Google ad-tech products because Google owns them, and it cannot bid directly into DFP. [3]
- Oversight is time-limited. A monitor and technical committee will supervise compliance for six years, rather than the 15 years sought by the government and states. [2] [3]
What happened
The immediate dispute was over the remedy for Google’s conduct, not whether the case had reached a liability finding. In April 2025, Brinkema found that Google had willfully acquired and maintained monopoly power in the open-web display publisher ad-server and ad-exchange markets. She also found that Google unlawfully tied its publisher ad server, historically known as DFP, to AdX. [4]
The Justice Department argued that selling AdX was the cleaner way to prevent Google from repeating the conduct. Reuters reported that the government said Google could not be trusted to run the exchange after the liability ruling. Google countered that a forced sale would be technically difficult, disruptive for customers and harmful to small businesses that use its tools. [1]
Brinkema’s September 2 announcement rejected the divestiture request while accepting behavioral remedies. At that stage, the public record was a short preview, and the judge allowed 14 days for confidential redactions. Reuters reported that Google had proposed, among other changes, giving competitors real-time access to bid information. [1]
The 106-page decision unsealed on September 16 supplied the missing detail. The judge said the measures should “effectively pry open to competition” the injured markets and prevent a return to anticompetitive conduct. The final judgment is to be jointly proposed by the parties within 30 days of the unsealed decision. [2]
Verified background: how the market works
When a user loads a webpage, automated systems can auction an available ad impression in fractions of a second. A publisher ad server manages the publisher’s inventory and can decide which demand gets considered. An ad exchange connects that inventory with buyers and handles auction activity. AdX is Google’s exchange; DFP is the publisher ad-server product addressed in the liability case. Google combines those tools in Google Ad Manager. [1] [4] [5]
The 2025 opinion distinguished the markets rather than treating all digital advertising as one business. The court rejected the plaintiffs’ attempt to establish a relevant market for open-web display advertiser ad networks, but found liability in the publisher ad-server and ad-exchange markets and in the DFP–AdX tie. That distinction matters because the remedy is aimed at specific access, data and bidding practices, not at all of Google’s advertising activity. [4]
The court’s remedy also reflects the technical role of independent infrastructure. The Justice Department said Google must integrate AdX and DFP with Prebid, an open-source real-time-bidding standard, and allow AdX to submit bids to other publisher ad servers. The stated objective is to let publishers use rival tools without losing access to demand that is distinctive to Google. [3]
Why it matters for publishers and buyers
For publishers, the most direct change is optionality. Data export can reduce the practical cost of changing providers, while rival-ad-server access to AdX bids could make it easier to compare demand without adopting Google’s full stack. The order also says a website using Google’s ad server cannot be required to use AdX, according to Reuters’ account of the unsealed decision. [2] [3]
For advertisers, the non-discrimination rules target the possibility that Google’s buying tool could favor Google-owned infrastructure. The remedy does not promise lower fees, higher publisher revenue or better campaign performance. Those are market outcomes that cannot be established from the order alone. AdExchanger reported that industry participants differed over whether behavioral rules would produce a level playing field or leave publishers without a sufficient answer to the structural problem. [5]
The result also illustrates the limits of a conduct remedy. Google retains the assets and commercial relationships at the center of the case. Competition will therefore depend on whether rivals can use the mandated interfaces, whether publishers actually switch or multi-home, and whether the monitor can detect and address evasive conduct. These are implementation questions, not findings that the order has already changed the market.
What remains uncertain
The exact operational terms will be set in the final judgment and in technical processes that follow. The public decision establishes categories of relief, but it does not by itself show how quickly every integration will be delivered, how bid data will be formatted, or how disputes over compliance will be resolved. The court gave the parties 30 days to propose the final judgment, leaving those details to the next stage. [2]
The order also does not determine the economic effect on publishers, advertisers or consumers. A six-year term is a legal duration, not a forecast of revenue, fees or auction quality. Nor does the remedy settle the appeal path. Google said it would appeal part of the decision, while the Justice Department said it was reviewing its legal options. [2] [3]
What happens next
Google and the Justice Department must work toward a proposed final judgment that translates the decision into enforceable obligations. The monitor and technical committee will then become central to testing access, data portability and bidding conduct during the six-year term. [2] [3]
The next meaningful evidence will be practical: whether Prebid and rival ad servers receive the promised integrations, whether publishers can export usable data, and whether Google’s AdWords bidding is treated consistently across Google-owned and rival infrastructure. Until those measures operate in the market, the defensible conclusion is narrower than a prediction of disruption: the court preserved Google’s AdX ownership while imposing a monitored framework intended to make the exchange compete on more open terms.
[1] [2] [3] [4] [5]
