Google must connect its AdX exchange and its DFP publisher ad server to Prebid and bid into rival publisher ad servers on the same terms it offers DFP. Those obligations come from the 106-page opinion that US District Judge Leonie Brinkema of the Eastern District of Virginia unsealed two weeks after her September 2 ruling in the Justice Department's ad tech case thenextweb.com. Google must also give publishers real-time data on winning and losing bids and publish documentation of how DFP picks auction winners. The rules apply worldwide and last six years, the term Google proposed, rather than the 15 years sought by the Justice Department and the states that joined the suit thenextweb.com. Brinkema rejected a forced sale of AdX, where publishers pay a 20% fee, and a demand to open-source DFP's auction code thenextweb.com. She wrote that measures to break up the business were "neither realistic nor needed" nytimes.com.
Google's financial exposure to the ruling is small. Reuters reported that AdX is a small part of Google's business. It also reported that Ad Manager accounted for 4.1% of Google's revenue and 1.5% of operating profit in 2020, according to Wedbush research, and that more recent figures were redacted from court documents usatoday.com. Alphabet's Google Network revenue fell from $7,256 million to $6,971 million year over year in the first quarter of 2026. In the second quarter it fell from $7,354 million to $7,303 million, while consolidated revenue grew 22% and 24% in those quarters sec.govsec.gov. GOOGL rose 0.6% on the day of the ruling cnbc.com.
The order rewires Google's auctions but leaves it owning both sides
The first remedy is untying: DFP users no longer have to use AdX thenextweb.com. Tech Times, a technology news site, reported that the order ends three auction mechanisms. AdX loses "first access" to every impression. AdX may no longer see rival bids before submitting its own. Google must drop unified pricing rules, so publishers can again set a different price floor for different buyers techtimes.com. The Current, an ad-industry trade publication, reported that the remedies fall into four groups: interoperability, data sharing, non-discriminatory bidding and buy-side restrictions. Under the last group, AdWords cannot bid directly into DFP or favour Google-owned ad tech because Google owns it thecurrent.com.
Ownership stays with Google. Tech Times noted that Brinkema's April 2025 liability ruling found Google held roughly 91% of the worldwide publisher ad server market by impressions. The outlet argued that owning both DFP and AdX "is what made those practices effective" techtimes.com. Our read is that the remedies target the mechanisms through which common ownership was exercised, and they leave in place the incentive the liability ruling identified.
Six years of oversight, worldwide, with a monitor described three ways
Brinkema rejected Google's argument that the rules should apply only in the US. She wrote that "for Google, a worldwide application of the final judgment would entail product changes that are consistent across all regions" thenextweb.com. Courthouse News reported that the court can extend the oversight period if the judgment has not achieved its goal thenextweb.com.
Accounts of the enforcement machinery conflict. Reuters reported that Google should appoint an internal antitrust compliance monitor. AdExchanger described a court-appointed technical monitor with full access to Google's staff, systems and source code. Courthouse News said both sides had proposed a monitor and a technical committee thenextweb.com. The timetable also varies by account. AdExchanger reported that the requirements take effect within 60 days thenextweb.com. The Current reported that Brinkema said every behavioural remedy would be fully in effect within 15 months thecurrent.com.
Brinkema chose conduct remedies despite referring to a "lack of trust that Google will comply with an order from this court," Courthouse News reported thenextweb.com.
Industry observers called it a Google win, and the Justice Department did not
Ari Paparo, an ad-tech industry analyst, wrote that "Google won across the board" and that "the actual remedies are things Google was probably willing to do anyway." Jason Kint, chief executive of Digital Content Next, a publisher trade group, said Google "must actually follow through — and the Court will have to enforce it" thecurrent.com. The New York Times wrote that the order effectively ensured Google's business "will continue largely unscathed" nytimes.com. Barry Lynn of the Open Markets Institute, an anti-monopoly think tank, called the decision "more proof the U.S. judiciary is abdicating its congressionally mandated duty to apply antitrust laws," according to Courthouse News thenextweb.com.
The government described the outcome differently. The Justice Department said it was "pleased that the court ordered substantial relief" and was "evaluating appropriate next steps," Reuters reported usatoday.com. Associate Attorney General Stanley Woodward Jr. called the ruling "a significant victory" techspot.com. The European Commission had argued that only a breakup would fix Google's ad tech business thenextweb.com.
Brinkema's reasoning leaned on the pace of change in the market. She wrote that AI has not yet reshaped ad technology as much as it has search. She also wrote that a lengthy effort to dismantle Google's business could be overtaken by "imminent industry disruptions caused by AI" techspot.com. She likened remedying the sector to "trying to shoe a galloping horse" thecurrent.com. Reuters counted the ruling as the third time in a row that US enforcers have sought a Big Tech breakup and lost usatoday.com.
Our read is that the final judgment's answer on the monitor will decide how much these remedies constrain Google. Specifically, whether an outside monitor gets source-code access, as AdExchanger reported, or Google appoints its own, as Reuters reported.