Google has avoided a court-ordered breakup of its advertising technology business, but a US federal judge has imposed a package of behavioural remedies designed to make the online advertising market more open to rivals and give publishers greater control over their data and auction choices.

The remedies, made public on 16 September 2026, follow an earlier finding that Google unlawfully monopolised parts of the publisher ad-server and ad-exchange markets. The US Department of Justice had sought more aggressive structural relief, including divestiture, but the court instead opted for integrations, data-access requirements and six years of monitoring.

Google keeps AdX and DFP, but the rules change

At the centre of the decision are Google’s AdX advertising exchange and DFP publisher ad server, both important pieces of the infrastructure used by publishers to sell online advertising inventory.

The court did not require Google to sell either business. Instead, Google must support integrations that reduce the practical advantages of keeping publishers inside a tightly connected Google-only stack.

According to the Justice Department, Google will have to create and support integrations between AdX and Prebid, and between DFP and Prebid. Prebid is a widely used open-source framework that helps publishers run real-time auctions involving multiple advertising partners.

AdX will also be required to submit real-time bids to competing publisher ad servers rather than limiting that demand to Google’s own DFP system. The intention is to make it easier for publishers to use alternative technology without losing access to important advertising demand.

Publishers gain more access to their own auction data

The ruling also imposes data-sharing obligations. Google must allow publishers to access and export data from DFP and AdX, including information that can make it easier to evaluate performance or move to another provider.

This matters because switching costs in advertising technology are not only about software. Historical auction and performance data can be commercially important, and limited portability can make it harder for publishers to test or adopt competing services.

The court’s remedies are therefore aimed not just at technical interoperability, but also at reducing the practical friction involved in changing providers.

Google Ads cannot receive preferential treatment

Another major part of the ruling concerns Google’s advertiser-side demand.

The Justice Department says the court ordered Google Ads, formerly known as AdWords, to bid in a non-discriminatory way rather than receiving preferential treatment because Google also owns the exchange or publisher tools involved in an auction.

Google Ads will not be allowed to bid directly into DFP, and the court barred preferential bidding into AdX or other Google ad-tech products simply because they are part of the same company.

For independent ad-tech businesses, this provision is significant because one long-running concern has been that ownership across multiple layers of the advertising chain can create opportunities for self-preferencing.

Six years of monitoring and technical oversight

Google will be subject to compliance oversight for six years. A monitor and technical committee will help assess whether the company is following the final judgment and implementing the required integrations and behavioural changes.

The six-year period is shorter than the 15 years requested by the Justice Department, but it still gives regulators a relatively long window to scrutinise whether the remedies are producing meaningful competition.

Reuters reported that Google plans to appeal parts of the underlying liability ruling. That means the legal fight is not necessarily over, even as the remedies move towards implementation.

Why this matters to publishers and advertisers

For publishers, the most important practical issue is whether the new rules make it easier to combine Google demand with competing ad servers and auction technologies without sacrificing revenue or operational efficiency.

For advertisers and agencies, the ruling could gradually increase competitive pressure across the supply chain if more publishers adopt alternative platforms or route inventory through a broader range of exchanges.

For independent ad-tech companies, the integrations and non-discrimination requirements may create more opportunities to compete for business that previously depended heavily on Google’s tightly connected infrastructure.

However, the ruling stops well short of dismantling Google’s ad-tech operation. Google still retains the same major businesses, so the ultimate impact will depend heavily on implementation, technical details and enforcement.

No breakup, but a meaningful change in how Google must compete

The most important takeaway is that the court chose behavioural reform rather than structural separation.

Google keeps ownership of its major publisher-side advertising technology, but it must operate those systems under new interoperability, data-sharing and non-discrimination obligations. The six-year monitoring regime is intended to make those obligations enforceable rather than merely aspirational.

For the digital publishing and advertising industries, the next phase will be less about the headline question of a breakup and more about whether the required integrations actually change auction behaviour, publisher choice and competition in practice.