Judge Ordered Google to Share Ad Auction Data
The court rejected a forced breakup of Google's ad technology unit in a new ruling.
Updated on Sept. 18, 2026 in Advertising
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US District Judge Leonie Brinkema has ordered Google to appoint an independent antitrust monitor and share auction data with publishers. The court declined to force a divestiture of the company's ad technology business.
Why it matters
The ruling aims to increase competition within the digital advertising market and prevent anticompetitive conduct. Judge Brinkema determined these remedies are sufficient to address illegal practices without dismantling the company.
Google currently charges a 20% fee for real-time online ad sales within its AdX marketplace. The judge detailed these requirements in a 106-page decision.
The players
Leonie Brinkema
She is a US District Judge who presided over the antitrust case against Google's advertising technology business.
This is a multinational technology corporation that manages a dominant online advertising marketplace.
Justice Department
This is the executive department of the United States federal government tasked with enforcing law and justice.
Amit Mehta
He is a US District Judge who previously ruled against a forced breakup of Google's search business.
The details
The court order mandates that Google open its auction data for six years to foster fair competition. The judge also cited the company's past behavior, specifically the deletion of employee chat logs, while ruling against a forced asset sale.
Timeline
April 2025: The court ruled that Google operated an illegal monopoly.
September 2025: Judge Amit Mehta issued a ruling against breaking up Google.
September 18, 2026: Judge Brinkema unsealed the decision regarding adtech practices.
Market Landscape
This decision builds upon the earlier finding of a monopoly by imposing specific operational remedies. It marks a shift from seeking divestiture toward regulating the conduct of existing dominant market players.
The requirement for Google to share auction data may eventually lead to more transparent pricing models for publishers and advertisers. There is no immediate change to the 20% fee structure currently applied to ad sales.
The takeaway
The court's decision suggests that regulators may prioritize operational oversight over the dissolution of large tech firms. Businesses and publishers should monitor how the newly appointed antitrust monitor alters day-to-day interactions with Google's ad platforms.
Further reading
For more on the regulatory environment facing digital firms, visit the Advertising section.
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