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Google Keeps AdX but Faces Six Years of Court-Ordered Ad-Tech Changes
Judge Leonie Brinkema concluded that six years of behavioral remedies could restore competition in Google’s illegal ad tech monopoly markets without forcing a sale of AdX. The decision turns on interoperability: rival publisher ad servers must be able to access AdX real time bids, which the court said could restore...
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Key takeaways
- Judge Leonie Brinkema concluded that six years of behavioral remedies could restore competition in Google’s illegal ad tech monopoly markets without forcing a sale of AdX.
- The decision turns on interoperability: rival publisher ad servers must be able to access AdX real time bids, which the court said could restore competition without divestiture.
- Google plans to appeal the underlying Google Ad Manager liability ruling, while the Justice Department said it was reviewing the opinion and its legal options.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did U.S. District Judge Leonie Brinkema’s September 2026 decision conclude about Google’s illegal online advertising-technology monopol. Article summary: Judge Leonie Brinkema concluded that behavioral remedies—not a forced breakup—could restore competition in the online ad-tech markets where she had found Google unlawfully maintained a monopoly. Her September decision re. Topic tags: general, news, general web. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts with fake numbers
Google will not be required to sell AdX or break up its advertising-technology operation. Instead, U.S. District Judge Leonie Brinkema ordered behavioral remedies intended to open the affected ad-tech markets to rivals after finding that Google had illegally maintained monopoly power. The remedies run for six years, rather than the 15 years sought by the Justice Department and plaintiff states. 10
The core ruling: change the conduct, not the ownership
Brinkema rejected the Justice Department’s proposed structural remedies, including a divestiture of AdX and open-sourcing the final-auction logic of Google’s publisher ad server. Google therefore retains AdX and its publisher-ad-server business, which are offered together through Google Ad Manager. 1
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The court instead concluded that behavioral changes could effectively restore competition. A central measure requires Google to allow other publisher ad servers to access real-time bids from AdX. Brinkema said that access could restore “much-needed” competition, making a forced sale unnecessary in her view. 10
What Google must change for six years
The remedies are aimed at the rules and relationships that made it difficult for publishers to use competing tools:
- Relax ad-auction rules. Google must change rules governing its online advertising auctions for six years.
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- End the AdX requirement for Google ad-server users. Google may not require a website or publisher using its ad server to also use AdX.
- Reduce publisher lock-in. The interoperability requirement is meant to give publishers a more practical ability to use rival ad servers while still reaching real-time AdX demand.
- Add internal compliance oversight. Google must appoint an internal antitrust-compliance monitor. The monitor’s role is more limited than the government requested.
The practical significance is that the remedy seeks to make Google’s exchange more accessible through competing publisher technology, rather than separating the exchange from Google’s ad-server business.
Why the judge rejected divestiture
The Justice Department argued that Google should be required to sell AdX, contending that structural separation was needed after the court’s monopoly finding. Brinkema disagreed, accepting most of the proposed behavioral remedies instead. 1
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Her reasoning focused on whether access and interoperability could address the competitive harm. If rival publisher ad servers can obtain AdX’s real-time bids and publishers are no longer compelled to pair Google’s ad server with AdX, the court concluded that competition could be restored without the disruption of a divestiture. 10
That is a consequential distinction: Google avoided losing a major ad-tech asset, but it will operate under court-mandated constraints intended to limit recurrence of the conduct at issue.
Google and the Justice Department both kept their options open
Google said it disagrees with the underlying liability ruling involving Google Ad Manager and intends to appeal. It had also argued that divestiture could make it harder for small businesses to reach customers. 1
The Justice Department characterized the outcome as a significant victory but said it was reviewing the opinion to determine its legal options. 1
The procedural timeline began with Brinkema’s September 2 order. The parties were given 14 days to seek redactions for confidential information and 30 days to submit a proposed final judgment implementing the remedies—deadlines that fell on September 16 and October 2, respectively. 13
Why this matters beyond ad tech
The decision follows Brinkema’s April 2025 finding that Google held illegal monopolies in publisher ad-server and ad-exchange markets and unlawfully tied the two products.
It also represents another major antitrust outcome in which a court declined to order a breakup of a large technology company. That matters for Google as it navigates other antitrust disputes and competes aggressively in artificial intelligence against companies including OpenAI and Anthropic. 1
The commercial stakes are substantial. Reuters reported that the decision cited projected global digital-ad spending of $605 billion in the following year, up from $424 billion in 2023; advertising represented about 73% of Alphabet’s revenue in the prior year. 1
For publishers, advertisers, and ad-tech rivals, the key question now is execution: whether mandated access to AdX bids and the removal of the ad-server tie will produce the competition that the court expects. The answer will depend on the final judgment, compliance, and the outcome of any appeal.
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What is the short answer to "Google Keeps AdX but Faces Six Years of Court-Ordered Ad-Tech Changes"?
Judge Leonie Brinkema concluded that six years of behavioral remedies could restore competition in Google’s illegal ad tech monopoly markets without forcing a sale of AdX.
What are the key points to validate first?
Judge Leonie Brinkema concluded that six years of behavioral remedies could restore competition in Google’s illegal ad tech monopoly markets without forcing a sale of AdX. The decision turns on interoperability: rival publisher ad servers must be able to access AdX real time bids, which the court said could restore competition without divestiture.
What should I do next in practice?
Google plans to appeal the underlying Google Ad Manager liability ruling, while the Justice Department said it was reviewing the opinion and its legal options.