# Google US ad-tech antitrust litigation

> Live situation record from CLSTR: https://clstr.news/situations/google-us-ad-tech-antitrust-litigation
> Updated: 2026-09-17T01:24:31.000Z. Sources: 7. Developments: 2.

A US federal judge has issued a ruling regarding Google’s digital advertising business following findings that the company unlawfully maintained monopolies in the publisher ad-server and ad-exchange markets.

In a 106-page ruling, US District Judge Leonie Brinkema rejected the Department of Justice’s request to force a structural breakup—specifically declining to mandate the divestiture of the AdX auction platform. Instead, the court imposed behavioral remedies designed to create a more competitive and transparent auction environment. These mandates require Google to make its advertising solutions interoperable with competing technologies, increase data sharing with publishers, and cease prioritizing its own services in auctions.

To ensure compliance, Google must appoint an internal antitrust monitor to oversee these changes for a period of six years. Google has announced its intention to appeal the decision, stating it disagrees with the ruling regarding Google Ad Manager and arguing that forced divestiture could harm the ability of small businesses to reach customers.

## Claims

- Judge Leonie Brinkema ordered Google to implement behavioral remedies rather than divesting its ad tech business. (corroborated by 4 sources)
- Google is required to appoint an internal antitrust compliance monitor. (corroborated by 2 sources)
- Google intends to appeal the ruling. (corroborated by 2 sources)
- Google must make its ad tech solutions interoperable with competitors. (single source)
- The behavioral remedies are set to last for six years. (single source)
- Google must increase data sharing with publishers and stop prioritizing its own services in auctions. (single source)

## Timeline

### 2026-09-17: Google ordered to implement ad tech remedies by U.S. judge

U.S. Judge Leonie Brinkema has ordered Google to implement behavioral remedies, including interoperability and increased data sharing, to address its illegal ad tech monopoly without forcing a divestiture.

5 sources. https://clstr.news/cluster/google-ordered-to-relax-adtech-rules-by-us-judge

### 2026-09-08: Google avoids breakup in landmark ad-tech antitrust ruling

A US federal judge rejected the Department of Justice’s push to break up Google’s ad-tech business, opting for behavioral remedies instead of forcing the sale of its AdX auction platform.

2 sources. https://clstr.news/cluster/google-avoids-breakup-in-landmark-ad-tech-antitrust-ruling

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Cite as: Google US ad-tech antitrust litigation. CLSTR, https://clstr.news/situations/google-us-ad-tech-antitrust-litigation