Observed Signal · Sep 2, 2026 · Regulation · Source: Manager Magazin · Impact: 4/5 · Sentiment: Positive
US Court Rejects Order for Google to Divest AdX
A US judge has rejected antitrust regulators' request to force Google to divest its AdX ad exchange. The case stems from a 2023 lawsuit by the US Department of Justice and several states alleging Google holds an illegal monopoly in online advertising. In April 2025, Judge Leonie Brinkema found Google illegally tied publishers to its ad server and compelled them to use AdX. Under the new ruling, the court no longer requires a breakup; Google had argued divestiture would be technically difficult and create prolonged uncertainty for advertisers, instead proposing easier switching to competing exchanges. The decision is the latest setback for US authorities seeking to curb Big Tech market power, following Google's earlier success in avoiding forced sales of Chrome and Android.
Major antitrust ruling preserving Google's ad tech stack and AdX exchange; prevents a structural breakup that would have reshaped the digital advertising market.
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Key Takeaways & Evidence Grounding
- A US judge rejected antitrust regulators' request to force Google to divest its AdX ad exchange.
- The lawsuit was filed by the US Department of Justice and numerous US states in 2023.
- In April 2025, Judge Leonie Brinkema ruled Google held illegal monopolies in publisher ad serving and ad exchanges.
- Google argued a forced sale of AdX would be technically difficult and cause uncertainty for advertisers.
- The ruling follows Google's earlier victory in avoiding forced divestiture of Chrome and Android.
Connected Companies & Entities
3 Entities mapped“Google achieved a major success in the US antitrust case over its online advertising business; the court rejected the forced sale of AdX....”
“The article refers to Google as an Alphabet subsidiary that previously avoided the forced sale of Chrome and Android....”
“The article notes a US court also rejected the FTC's demand to force Meta to divest Instagram and WhatsApp....”
Ontology Mapping & Concepts
Related Market Signals & Shifts
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Judge Rules Google Won’t Have to Break Up Ad Tech Business
Judge Leonie Brinkema ruled that Google illegally monopolized publisher ad-server and ad-exchange markets, but rejected the DOJ's proposed structural remedies, including divestiture of AdX and DFP. Instead, she imposed behavioral remedies largely based on Google's own proposals, requiring AdX to bid into Prebid via API integrations, mandating non-discriminatory bidding by Google Ads, eliminating UPR in the US, and banning first/last look. Google must share real-time bid data with publishers and stop AdWords from bidding directly into DFP or favoring Google's tools. The remedies apply globally but exclude video, in-app, and retail media, and do not require open-sourcing auction logic. A technical monitor will oversee compliance for six years with quarterly reporting. The ruling favors large exchanges and publishers with technical resources, while the DOJ lost on including DV360 and video/in-app inventory. Google retains AdX and DFP but intends to appeal. This parallels Judge Mehta's 2024 search decision, marking a second illegal monopoly finding without a breakup. Separate EU fines, state AG cases, and civil lawsuits continue.
Judge Weighs Google's Ad Tech Future After Closing Arguments
Closing arguments in the DOJ v. Google ad tech antitrust trial have concluded, and Judge Leonie Brinkema will decide the fate of Google's sell-side ad tech business, AdX. The DOJ pressed for a structural remedy—divestiture of AdX—arguing that behavioral requirements would leave Google room to undermine the ruling, while Google contended that trust is at the core of the matter and that a full divestiture is unnecessary. Google's attorney, Karen Dunn, contrasted the DOJ's approach with the outcomes of the Google Search antitrust trial, suggesting a lighter, behavioral remedy could suffice. The judge voiced concerns about how quickly any remedies could take effect given rapid innovation in ad tech. A potential AdX buyer, such as Microsoft, was mentioned, though no ready acquirer was identified and a divestiture could trigger additional antitrust reviews. A decision is expected next year, with appeals likely.
Google's Antitrust Battles: Guilty but Unbroken in 2025
AdExchanger assesses Google's 2025 antitrust trajectory: the company faced guilty findings in both a search monopoly and a publisher ad tech monopoly, and Europe imposed fines, but no divestitures materialized. In the DOJ’s search case, Judge Amit Mehta ordered Google to share search data with qualified competitors, yet imposed no divestiture or major changes to Google Search. In the publisher ad tech suit, the DOJ seeks divestiture of AdX and possibly DFP within Google Ad Manager, but remedies phase observers remain skeptical a court will mandate a break-up. European regulators are in a holding pattern pending Judge Brinkema’s decision. The piece notes a possible 2026 divestiture of AdX that could decouple the Ad Exchange from the ad server, reshaping market dynamics. Separately, Europe has eliminated Unified Pricing Rules; the US is eyeing a partial end to UPR for open-web display ads, with potential gains for publishers and developers.
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