Google spared ad-business breakup, but judge orders operational changes
The U.S. Department of Justice will go down in history as the regulator that came closest to dismantling Google's advertising empire after more than five years of legal battles across two separate antitrust fronts. In a decision handed down on Wednesday, September 2, 2026, federal judge Leonie M. Brinkema of the Eastern District of Virginia ruled that Google will keep its lucrative ad-technology division in its entirety, rejecting the divestiture request the U.S. government had been pursuing since 2023. The ruling, however, imposes substantial modifications on the Mountain View giant's business practices to favor competitors, although, as The New York Times reported, the decision did not yet specify the precise compliance mechanisms. Lee-Anne Mulholland, Google's vice president of regulatory affairs, publicly welcomed the verdict, stating the company is "very pleased" the court rejected the proposal to break apart tools that, in its narrative, help small businesses grow.
At the heart of the litigation lies an extraordinarily opaque and complex market architecture in which Google allegedly relied for years on exclusive agreements with device manufacturers and revenue-sharing deals with mobile carriers to ensure its search engine remained the default on the vast majority of phones worldwide. That default-search dominance, prosecutors argued and the April 2025 ruling confirmed, directly fueled the strength of Google's advertising platform. Judge Brinkema's determination thus mirrors a pattern already observed in the parallel search case: in September 2025, Judge Amit Mehta likewise rejected the DOJ's requests to force divestiture of Chrome and Android, limiting his remedies to ordering an end to exclusive default-placement deals and the sharing of certain search data with competitors — measures Google is currently appealing.
The digital advertising ecosystem is famously labyrinthine, built on a maze of intermediaries, real-time auctions, and opaque supply chains — a structure in which Google has consolidated for more than a decade a quasi-monopolistic position linking advertisers, publishers, and consumers. The DOJ's case, formally known as United States v. Google (ad-tech), challenged not only the default agreements but Google's full vertical integration: from its ad exchange (AdX) to its demand-side platform (DV360) and its publisher ad server (Google Ad Manager), an architecture that, per the complaint, allowed Google to manipulate auctions in its own favor. The April 2025 finding concluded that this configuration constituted an illegal monopoly, and this week's decision addressed only the remedy phase, leaving the details of operational changes for the next 14 days while the full written ruling remains under seal to allow redactions.
Strategically, Google secures a critical win by keeping intact the unit that, by various industry estimates, generates tens of billions of dollars annually and forms a central pillar of its revenue model. The ruling nevertheless sets a significant precedent in U.S. antitrust policy, confirming that the vertical integration of big tech firms can be declared illegal even when a structural breakup is not ordered. For the DOJ, accustomed to pursuing structural remedies against digital giants since the Microsoft case, the outcome amounts to a partial legal victory: two courts have now agreed that Google engaged in monopolistic conduct, but neither has imposed the ultimate sanction of breaking up the company. In the coming months, industry attention will shift to the technical details of the ordered remedies, to the appeal Google is already pursuing in the search case, and to whether the European Commission, which has been running parallel actions against Google's ad business, intensifies its own enforcement — a regulatory pressure that remains at historically high levels.