Judge Orders Google to Share Ad-Auction Data, Keeps Structure

Judge Leonie Brinkema ordered Google on Sept. 18 to disclose more ad-auction data and accept an independent antitrust monitor, leaving its adtech structure intact and drawing criticism from advocacy groups.

Data sharing and monitor

The court's 106-page decision ordered Google to share additional information about how its ad auctions operate with publishers and to install an independent antitrust monitor to oversee business practices, among other changes. The order was unsealed roughly two weeks after Brinkema indicated she would not impose a forced breakup of Google's ad business.

Publishers said greater transparency could narrow information asymmetries that have favored large platforms, while privacy and competition advocates described the ruling as a missed opportunity to structurally dismantle the market leader. Officials said the judge stopped short of ordering divestitures, framing remedies around disclosure and oversight rather than separation.

If Google files a notice of appeal, federal rules give the company 30 days to do so; that deadline would fall on Oct. 18, 2026. Market participants and publishers will watch any filings and the antitrust monitor's appointment timetable for signs of how quickly the court expects compliance and whether further legal steps will alter adtech economics.