A federal judge refused to break up Google’s ad tech business. The decision leaves publishers and ad tech rivals facing the same dominant player, despite findings of illegal monopoly.
Google will keep control of its digital advertising exchange after a federal judge rejected the Justice Department’s attempt to force a sale. For publishers and ad tech competitors, little changes: Google remains the central player, even after the court found it had illegally suppressed competition in the ad tech market.
Judge Leonie Brinkema delivered the decision on September 2, 2026, in Alexandria, Virginia. This is the third time in a row that US antitrust officials have failed to break up a major tech company. Instead of ordering Google to sell AdX, Brinkema accepted a set of behavioral changes, including Google’s promise to give rivals real-time access to bidding data. The full ruling will be released in two weeks, after confidential business information is redacted, according to a Reuters legal update.
According to Reuters, publishers pay Google a 20% commission for selling ad inventory through AdX auctions, which are executed instantly when a page loads.
The DOJ argued that Google’s past actions showed it could not be trusted to run AdX fairly. In 2025, the same court found Google had unlawfully monopolized two markets in open-web display ad tech and illegally tied its publisher ad server to its ad exchange to keep its lead, according to a CCIA statement. Still, the court stopped short of forcing a breakup and instead chose less drastic remedies.
AdX, where publishers pay a 20% fee to auction ad space, makes up a small part of Google’s revenue-just 4.1% in 2020, according to Wedbush research cited by Reuters. Even so, the DOJ and several states focused on AdX as a key part of Google’s dominance, arguing that only a forced sale would restore competition. Google said a divestiture would be technically difficult and disruptive for customers, and that its earlier willingness to sell AdX in Europe did not apply to the US case.
After the ruling, Google executives said they were pleased, noting that the court had rejected a plan that would have dismantled tools used by small businesses to reach customers. The DOJ called the outcome a partial win, pointing to the “substantial relief” ordered by the court, and said it was considering its next steps. Google’s stock rose 0.6% after the news, as investors welcomed the decision not to break up the business.
Bloomberg and other agencies reported that, instead of splitting up the business, the court required Google to ensure interoperability of its ad tech tools with competitors' solutions. The specific behavioral obligations remain under seal until the redacted text is published.
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For publishers, the decision means continued dependence on Google’s ad tech stack, with only minor changes to business practices. The ruling also raises questions about the effectiveness of the US government’s broader antitrust efforts against tech platforms. Previous attempts to force Meta to sell Instagram and WhatsApp, or to make Google divest Chrome, have also failed. Judges have pointed to changing market conditions, including the rise of generative AI competitors like OpenAI’s ChatGPT, as reasons to avoid drastic measures.
Advocacy groups such as The Tech Oversight Project now say that only new laws can restore competition in digital advertising. The group’s executive director, Sacha Haworth, said recent court decisions show the judiciary alone cannot check Big Tech’s power. This matches findings from an earlier analysis of how regulation and technology are reshaping digital commerce and advertising.
With cases against Amazon and Apple still pending, the DOJ’s loss in the Google AdX case suggests that structural antitrust remedies are becoming harder to win. The court’s preference for behavioral changes over asset sales may encourage dominant platforms to settle rather than risk being forced to break up. For publishers and ad tech challengers, the message is clear: legal wins against Big Tech’s market power are rare, and real change may depend on Congress. The DOJ’s next steps-and whether lawmakers act-will decide if this era of tech dominance continues or faces real limits.
Alphabet, Google’s parent company, reported annual revenue of over $300 billion in 2025, with advertising making up more than 75% of total income. Google’s ad tech stack, including AdX and Ad Manager, handles billions of ad impressions daily and supports thousands of publishers worldwide. Despite regulatory scrutiny, Google’s share of the global digital ad market remains above 25%, making it the largest player in the sector.
