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The U.S. Department of Justice is calling for Google to break up its digital advertising empire after a federal judge ruled the tech giant illegally maintained monopoly power in the ad exchange market.
Driving the news. In a court filing on Sunday, the DOJ said Google should divest its AdX exchange, where ad inventory is bought and sold. It should also sell its DFP platform, which publishers use to manage and serve ads. The sales would be overseen by a court-appointed trustee, who would find buyers and monitor compliance.
Why we care. The DOJ’s proposal to force Google to sell off AdX and DFP strikes the core of Google’s multibillion-dollar ad tech stack. A sale of AdX and DFP could disrupt how digital ads are bought and sold, potentially impacting the costs and efficiency of ad campaigns.
A forced divestiture might fragment the ecosystem, making it harder to target audiences and measure performance across platforms. It could also force advertisers to adapt to new systems or lose access to integrated capabilities they rely on today.
Catch up quick. Judge Leonie Brinkema ruled on April 16 that Google violated the Sherman Antitrust Act by using its dominance in ad tech to harm competition and control pricing in the open web ad market.
Google’s response. Google pushed back hard, arguing that:
- Divestiture is “not technically feasible” because AdX and DFP are deeply integrated into Google’s infrastructure.
- Instead, it offered conduct remedies to increase transparency and interoperability: Letting rival ad servers access real-time bids from AdX.
- Dropping Unified Pricing Rules to give publishers more control.
- Continuing to avoid “first look” and “last look” auction tactics.
- Google says these remedies fully address the court’s liability findings — a point it claims the DOJ conceded in court.
“The DOJ’s additional proposals to force a divestiture of our ad tech tools go well beyond the Court’s findings, have no basis in law, and would harm publishers and advertisers,” said Lee-Anne Mulholland, Google’s VP of Regulatory Affairs.
Between the lines. The case centers on Google Ad Manager, a product Google argues is a small piece of its business but critical for publishers. Google says forcing a sale could raise costs and disrupt tools that small businesses and independent publishers rely on.
What’s next. Both sides will continue to negotiate remedies as the case heads toward appeal. The court could approve a divestiture plan or Google’s proposed behavioral fixes.
Dig deeper:
Zoom out. The case is one of several antitrust battles Google faces in the U.S. and globally. A win for the DOJ here could set a precedent for structural remedies in Big Tech regulation.
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