US Court Rejects Breakup of Google Ad Tech Monopoly, Orders Behavioral Fixes

A U.S. federal court has declined to break up Google's advertising technology business, opting instead for behavioral mandates to curb the company's market dominance. The ruling follows an April 2025 finding that Google illegally monopolized the digital ad tech market, specifically regarding publisher ad servers and ad exchanges.

On September 2, 2026, Judge Leonie Brinkema issued a remedies order rejecting the Department of Justice's request for structural remedies. The court denied the DOJ's push to force the divestiture of Google's DoubleClick for Publishers (DFP) ad server and its AdX ad exchange. Instead, the court accepted a series of modified behavioral remedies, including the elimination of price-setting rules that the government argued facilitated self-preferencing.

The Battle Over the Ad Stack

The legal conflict centered on Google's control over the "ad tech stack," the complex chain of tools used to buy and sell digital ads. The DOJ argued that by vertically integrating its ad server and ad exchange, Google could manipulate auctions to favor its own tools and extract monopoly rents from publishers. This integration allegedly stifled competition and reduced the total revenue available to independent news publishers.

The financial stakes are significant. Google's ad tech business generated approximately $30 billion in revenue in 2024, representing roughly 8% of Alphabet's total revenue. By controlling both the tools publishers use to sell space and the exchange where those sales happen, Google maintained a pivotal position in the digital economy.

Implications for the Industry

The decision to favor behavioral remedies over a forced breakup is a major victory for Google. By avoiding structural divestiture, the company preserves its core ad tech infrastructure and avoids the operational chaos of a forced sale of DFP and AdX.

For the journalism industry and digital publishers, the ruling is a mixed result. While the behavioral changes are designed to improve auction fairness and reduce self-preferencing, many industry observers view the rejection of a breakup as a missed opportunity to fundamentally reset the market. The court's approach seeks to fix the behavior of the monopoly without dismantling the monopoly's structure.

What Remains

Market participants will now watch closely to see how the behavioral remedies are implemented and whether they actually result in higher revenues for publishers. The effectiveness of these rules in preventing self-preferencing remains to be seen, and the court's oversight will be critical in determining if these changes are sufficient to restore competition to the open web's advertising ecosystem.