US judge rejects bid to break up Google's ad business

In a court order, US District Court Judge Leonie Brinkema opted instead for a set of rules governing how Google must operate in the ad market.

The decision is the second time in recent years that a federal judge has declined to dismantle a piece of Google's business, after a judge last year refused to force the sale of its Chrome browser in a separate monopoly case over online search.

Those cases are part of a broader effort by the Department of Justice (DOJ) to curtail the competitive dominance of big tech companies, including Apple, Amazon and Meta.

Results have been mixed, with another judge deciding against government lawyers in a suit concerning Meta's social media empire, but other decisions going the government's way.

"We're very pleased the Court rejected the DOJ's proposal to break apart tools that help small businesses reach new customers and grow," Google's vice president of regulatory affairs Lee-Anne Mulholland said in a statement.

The reasoning behind today's decision was not immediately made public.

Brinkema, in Alexandria, Virginia, filed her opinion under seal for 14 days, leaving the details of how Google must change its ad business unknown for now.

She gave the two sides 30 days to submit a joint proposed final judgment.

Brinkema ruled last year that Google had willfully monopolised both the publisher ad server and ad exchange markets, and had unlawfully tied the two products together.

Google has said it will appeal the underlying liability ruling.

According to the Department of Justice, Google once compared this arrangement to Goldman Sachs owning the New York Stock Exchange.

Prosecutors had sought the sale of Google's ad auction site AdX and the open-sourcing of critical auction technology.

It had also argued that splitting up the service would be technically unfeasible.

At closing arguments last year, Brinkema questioned how long a forced sale would take and noted that no buyer for AdX had been identified.

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