Federal Judge Rules Against Forcing Google to Divest Advertising Business in Antitrust Case

The U.S. Department of Justice argued that forcing Alphabet Inc. to sell its AdX advertising exchange was the only way to dismantle an illegal monopoly over the $1 trillion global digital ad market. On September 2, U.S. District Judge Leonie Brinkema rejected that claim, ruling that Google will not be forced to divest its ad-tech infrastructure and can instead rely on behavioral remedies to restore market competition.[1][2]

The decision allows the company to avoid a structural breakup that would have severed a platform charging publishers a 20% fee on transactions. The ruling concludes the remedies phase of an antitrust lawsuit filed in 2023 by the Justice Department and a coalition of states.[1]

The first trial, held in September 2024, led to Brinkema's April 2025 determination that Google held illegal monopolies in two ad-tech markets: the publisher ad servers that host inventory and the ad exchanges that sit between buyers and sellers. The court found that Google unlawfully locked publishers into using AdX, substantially harming the competitive process.[1]

The Justice Department subsequently pushed for a forced sale of AdX and a mandate to open-source the final-auction logic in Google's DoubleClick for Publishers ad server. Instead of a divestiture, Brinkema's brief public order accepted most of the behavioral remedies proposed by the parties, subject to court modifications.[1][2]

The specific operational changes remain detailed in a sealed memorandum, but the mandate requires Google to make its ad-tech tools work more readily with competitor products. Google argued during the trial that separating the exchange from its infrastructure would be technically complicated, potentially take years, and risk disruption for customers.[1][3]

Alphabet executives claimed the outcome as a victory for their operational model. "We're very pleased the Court rejected the DOJ's proposal to break apart tools that help small businesses reach new customers and grow," stated Google Vice President of Regulatory Affairs Lee-Anne Mulholland. The Justice Department also characterized the order as a step forward, with a spokesperson stating it provides substantial relief and brings the market closer to restored competition.[1][4]

The decision marks the third consecutive instance in which a court rejected an attempt by federal regulators to force a major technology company to sell assets. Google previously avoided another major divestiture when a federal judge declined to order the sale of its Chrome browser after finding that the company illegally maintained a monopoly in online search.[3]

While Google has fended off the immediate threat of a U.S. breakup, its core advertising stack remains under intense legal scrutiny globally. The company also faces pressure abroad, where the European Union previously fined Google nearly €3 billion for abusing its dominant position in the ad-tech sector. The final judgment due in October 2026 will dictate the exact technical adjustments Google must make to its auction logic, setting the new operational baseline for the digital advertising economy.[1][2]