Judge Rejects DOJ Bid to Force Google to Sell AdX, Ordering Behavioral Remedies Instead

A federal judge has rejected the Justice Department's demand that Google sell its AdX advertising exchange, the second major antitrust breakup request against the company to fail in a single year, and instead ordered a set of behavioral remedies intended to make the digital advertising market more competitive. United States District Judge Leonie Brinkema ruled on September 2, 2026, that Google will not be forced to divest AdX, the real-time auction system that sits at the center of the online ad economy, but will be required to change how it operates parts of its ad stack. AP News reported on September 4 that the decision marks the third consecutive failure by the US government to force a breakup of a major technology company, after earlier losses in its attempts to break up Meta and to force Google to sell its Chrome browser.

The ruling does not end the case, but it redirects it. Rather than the structural remedy the Justice Department had sought, the judge ordered what antitrust lawyers call conduct or behavioral remedies, specific changes to Google's advertising practices rather than a change to its ownership structure. Search Engine Land reported on September 4 that the remedies include requirements for transparency in real-time bidding, an end to Google's unified pricing rules, and prohibitions on practices such as first-look and last-look advantages that gave Google's own exchange preferential access to inventory. The order was filed under seal for 14 days, and the two sides have 30 days to submit a joint proposed final judgment, meaning the practical details of the remedies will take shape over the coming weeks.

Key Facts

The decision's core is the rejection of divestiture. AP News reported on September 4 that Judge Brinkema found that forcing Google to sell AdX was not the appropriate remedy, even after a jury and the court had previously found Google liable for monopolization in the ad-tech market. The ruling is a significant defeat for the Justice Department, which had argued that only the sale of AdX could restore competition in the market for the software that matches advertisers with the websites and apps where their ads appear. Google had maintained throughout the litigation that selling AdX would be disproportionate and disruptive, and the court's acceptance of that argument in the remedy phase spares the company the most consequential outcome it faced.

The behavioral remedies that were ordered target the specific practices the court found anticompetitive. Search Engine Land reported on September 4 that the judge's order requires changes to how Google runs its ad auctions, including making real-time bidding more transparent to advertisers and publishers, eliminating the unified pricing rules that required advertisers to bid the same price across Google's tools, and barring the company from using its position in the ad stack to give its own exchange first or last look at available inventory. These remedies aim to reduce the information and timing advantages that the court found allowed Google to steer transactions to AdX at the expense of rival exchanges such as those operated by Microsoft and Amazon.

The procedural path from here is concrete. The order was filed under seal, and Search Engine Land noted on September 4 that the details will remain confidential for 14 days while the parties and the court work out the final language, with the two sides required to submit a joint proposed final judgment within 30 days. The appeals process will almost certainly follow regardless of the outcome, since both Google, which may argue the behavioral remedies still go too far, and the Justice Department, which may argue they do not go far enough, have reasons to challenge parts of the ruling. The significance of the case extends beyond Google, because AP News reported on September 4 that this is the third straight loss for the government's breakup agenda, following the Meta case and the separate attempt to force a sale of Chrome, establishing a judicial pattern that structural divestiture of tech platforms faces steep hurdles in US courts.

Analysis

What this really means is that American antitrust law has reached a settled position on the biggest question of the tech backlash, that monopolization can be proven but forced breakups will rarely be ordered, and that the remedy of choice will be regulation of conduct rather than restructuring of ownership. The pattern across the Meta, Chrome and AdX cases is now too consistent to be coincidence, juries and courts have been willing to find that the largest platforms broke the law, but judges have been unwilling to impose the nuclear remedy of divestiture, citing the difficulty of carving out assets, the risk of harming consumers and the availability of less drastic alternatives. That pattern tells the Justice Department that its litigation strategy should shift toward seeking behavioral remedies from the start, because it will rarely win a breakup even when it wins the liability phase.

The bigger picture here is that behavioral remedies, while less dramatic than divestiture, can still meaningfully change how the digital advertising market operates. The practices the judge ordered changed, unified pricing rules, first-look and last-look advantages, opaque real-time bidding, are the mechanisms the court found Google used to entrench AdX, and removing them could give rival exchanges a fairer shot at inventory and give publishers more control over how their ad space is sold. Google's own data, cited during the liability phase, showed that its exchange profited from the very practices the court has now banned, so the remedies strike at the source of the monopoly profits even without changing who owns the exchange. The key question is enforcement, because behavioral remedies require ongoing monitoring and can be gamed with subtle design changes, a challenge the Justice Department and the court will face for years.

There is a defensive logic in Google's position that deserves attention. The company argued, and the court apparently accepted, that the customers of its ad stack, including the vast majority of publishers who use its ad server free of charge, benefit from the integration the government wanted to break apart. Google has long maintained that its ad tools work together to deliver better results than any combination of separate tools could, and the fact that 92 percent of publishers use its ad server without paying, a figure cited during the case, suggests that the company's tools solve real problems for the publishers who rely on them. The danger in the behavioral remedy approach is that it could make Google's tools less useful to publishers in the name of helping Google's competitors, and the court will have to watch whether the remedies help the market without breaking the products the market depends on.

Why It Matters

For Google, the ruling removes the existential threat of being forced to sell AdX, which was the single largest financial exposure in any of the company's antitrust cases, and replaces it with a compliance burden that, while real, is far more manageable, since Ad Manager was estimated to account for only about 4.1 percent of Google's revenue and 1.5 percent of its operating profit in 2020, according to figures cited during the litigation. For advertisers and publishers, the behavioral remedies could produce a more transparent auction market with fewer hidden advantages, though the practical benefits will depend on how aggressively the remedies are enforced. For the Justice Department, the ruling is the third consecutive confirmation that its breakup agenda has stalled, which will force a strategic reassessment of how the government pursues tech monopolies. And for the broader technology industry, the pattern of liability without divestiture sends a clear signal, that the era of unchallenged platform power is ending, but the era of court-ordered corporate surgery is not beginning, and the real action in antitrust will be in the details of behavioral oversight rather than in headline-grabbing breakups.

Next Up

In the coming weeks, watch for the unsealing of the full order after the 14-day seal period and the joint proposed final judgment that the parties must file within 30 days, since those documents will reveal the precise mechanics of the behavioral remedies and whether the two sides found common ground or remain far apart. Watch also for the appeals, because both Google and the Justice Department have plausible grounds to challenge the ruling, and the case could wind through the appellate courts for years regardless of the remedy phase outcome. The most important signal for the industry will be how the behavioral remedies affect the actual mechanics of online advertising, whether rival exchanges gain share, whether publishers see different economics, and whether Google's products change in ways that advertisers and publishers notice, because the real test of this ruling is not the legal language but whether the digital ad market becomes measurably more competitive.