A federal judge has denied the U.S. Department of Justice’s request to force Google to sell its AdX advertising exchange, preserving a prior ruling that found the company illegally monopolized key ad-tech markets while declining structural remedies.
Judge denies divestiture but upholds monopoly finding
U.S. District Judge Leonie M. Brinkema ruled against the DOJ’s bid to compel Google to divest AdX, the ad exchange platform that facilitates real-time auctions between publishers and advertisers. The decision leaves intact a prior liability finding that Google’s control over both publisher ad servers and ad exchanges constituted an illegal monopoly. However, the judge declined to impose structural changes, such as breaking up Google’s ad-tech business.
Behavioral remedies remain under seal
While the divestiture request was rejected, the court accepted a set of behavioral remedies—specific restrictions on Google’s conduct in ad-tech markets. The full details of these remedies are currently under seal, pending further review. The DOJ has not indicated whether it plans to appeal the decision.
Market and legal reactions
Shares of Alphabet (Google’s parent company) rose following the ruling, as investors interpreted the outcome as reducing the risk of a forced breakup. Analysts at firms including Barron’s noted that the decision removed a key overhang on Google’s stock valuation. The company issued a statement calling the ruling a victory, with Google Vice President of Regulatory Affairs Lee-Anne Mulholland stating: “We’re very pleased the court rejected the DOJ’s proposal to break apart tools that help small businesses reach new customers and grow.”
Background: The ad-tech monopoly case
The ruling stems from a lawsuit filed by the DOJ alleging that Google’s dominance in publisher ad servers and ad exchanges stifled competition. The case focused on Google’s control over the “sell side” (where publishers offer ad inventory), the “buy side” (where advertisers bid), and the ad exchange (where transactions occur in real time). The court found that Google’s integrated control over these components allowed it to extract excessive fees from publishers and advertisers while limiting competitors’ access to the market.
Contrast with prior Google antitrust cases
This decision follows a 2024 ruling in a separate DOJ case that found Google illegally monopolized search markets. In that case, the judge also declined to impose structural remedies, instead ordering behavioral changes. Legal experts note a pattern in recent U.S. antitrust enforcement against Big Tech, where courts have upheld monopoly findings but declined to order breakups or major structural changes.
Broader implications for antitrust enforcement
The outcome raises questions about the effectiveness of U.S. antitrust enforcement against dominant tech platforms. Critics argue that without structural remedies, behavioral fixes may prove insufficient to restore competition. Others contend that the ruling appropriately balances enforcement with the need to avoid disrupting established business models. The case also highlights the ongoing debate over whether courts or legislatures should lead efforts to rein in Big Tech.
Next steps
The DOJ has not announced whether it will appeal the decision. The sealed behavioral remedies are expected to be unsealed in the coming weeks, providing further clarity on Google’s obligations. The case remains active, with an appeal path still open for both parties.