Developing
Nothing changes operationally yet: the obligations take effect only after a final judgment is entered.
In 60 seconds
- On September 2, 2026 Judge Leonie Brinkema rejected the DOJ's three structural remedies, including divestiture of AdX and open-sourcing DFP's final auction logic.
- She accepted most of the parties' proposed behavioral remedies as modified; the memorandum opinion remains sealed.
- Parties were to file redaction requests by September 16 and one joint proposed Final Judgment by October 2.
- AdX stays with Google, and nothing changes operationally for advertisers until the Final Judgment.
Impact Layer
- What changed
- The court chose behavioral controls over breaking up Google's ad tech business.
- Why it matters
- Publishers and advertisers will keep dealing with an integrated Google stack under rules, not a split one.
- Who is affected
- Publishers, advertisers, agencies and competing ad tech companies.
- Martech stack area
- Advertising
- Stack impact
- Plan for continued use of Google Ad Manager; watch the Final Judgment for interoperability and data-sharing terms.
- Business impact
- High The memorandum opinion explaining the reasoning is sealed, so the stated results are the only public detail.
- Related technologies
- Related vendors
- What to watch
- The final judgment, the length of any monitoring, and appeals.
On September 2, 2026, US District Judge Leonie Brinkema ruled on remedies in the Justice Department’s ad tech case against Google, according to Relevant Audience.
The order
- She rejected all three structural remedies the DOJ sought: divestiture of AdX, open-sourcing of DFP’s final auction logic, and a contingent DFP divestiture.
- She accepted “most of the parties’ proposed behavioural remedies as modified.”
- The Memorandum Opinion explaining her reasoning remains confidential, so the public document gives results, not rationale. The DOJ had sought 10 years of enforcement; Google proposed three.
Dates
September 16, 2026 was the deadline for parties to request redactions to the sealed reasoning. October 2, 2026 was the deadline for one jointly proposed Final Judgment. Behavioral obligations take effect only when the Final Judgment is final.
Effects now
Google Ad Manager remains integrated and AdX stays with Google. Nothing changes operationally for advertisers this month. Competition lawyer Thomas Hoeppner called the ruling “a denial rather than a resolution,” and suggested it might affect parallel European Commission proceedings.
Our read
A breakup would have changed how publishers and buyers route inventory. Behavioral rules keep today’s structure and make the details of the Final Judgment, such as data sharing and interoperability, the thing to watch. Until the sealed reasoning is public, planning should assume continuity.
Sources
- Relevant Audience: Judge rejects AdX divestiture in DOJ ad tech case (opens in a new tab)
Source of the order, timeline, sealed reasoning and reactions.
- Al Jazeera: US judge rejects bid to break up Google's ad business (opens in a new tab)
Context on the decision. Not read directly.