A United States federal judge ruled on September 2, 2026, in a landmark case that Google will not be compelled to sell its main advertising exchange AdX, a decision that impacts the technology and media industries. The decision ends the remedies phase of a case of high stakes antitrust litigation filed by the U.S. Department of Justice (DOJ) and a group of state attorneys general. 

Although Judge Leonie M. Brinkema rejected the government’s request for a structural breakup, she imposed behavioural remedies intended to address the antitrust violations and promote competition in the digital advertising market. The ruling is a historic milestone to digital publishers, advertisers and the overall ad-technology industry, defining how technology giants can be regulated without necessarily being destroyed. 

Google Avoids a Forced Breakup of Its Ad Business

The move, made by the judge, Brinkema, in the U.S. District Court of Eastern District of Virginia (Alexandria Division), rejects the idea by the government to compel Google to divest its AdX exchange. Google will therefore retain ownership of AdX and continue operating its advertising technology business. 

The court granted most of the proposed behavioural remedies, instead of ordering a corporate spin-off. These remedies impose binding rules of operation on Google on the way in which Google handles its technology of advertising and the way in which Google performs auctions.  Since the complete judicial opinion includes some sensitive commercial information, the detailed order is temporarily closed as the parties go through some required redactions. A redacted public version of the decision is expected to become public later in the month.  

What the US Government Wanted

In 2023, the DOJ and its state co-plaintiffs filed the suit, claiming Google had created an unlawful monopoly in the open-web advertising channel. In the remedies phase, the government lawyers contended that the only effective remedy to the harm was structural divestiture, which meant that Google should be compelled to sell AdX. 

The government had three main arguments that it based its case on:

• Conflict of Interest: The fact that the sell-side tools (used by publishers) were controlled by the same entity (as the buy-side tools (used by advertisers)) and the central marketplace (AdX) posed an implicit conflict of interest.

• Entrenched Advantage: Government lawyers claimed that Google had a history of behavior that provided it with an advantage that was impregnable and that promises and conduct rules alone would not fix.

• Structural vs. Behavioural Remedies: DOJ argued that structural remedies (compelling the sale of assets) promote clean market lines, whereas behavioural remedies (regulations controlling behaviour) necessitate continuing judicial oversight and may be hard to enforce. 

What Is Google’s AdX and Why Is It Important?

To see the extent of the choice, it would be useful to consider the manner in which online display advertising works. Upon opening a news site or online publication, an automatic real-time bid takes place, in a few milliseconds, to determine which ad to display on the page.

These real-time transactions take place in Google AdX (Ad Exchange) which is the digital market place. It serves as the main marketplace between sell-side inventory by publishers and the buy-side demand by advertisers. AdX is an advertising exchange where publishers can sell digital advertising inventory through real-time auctions. 

The Earlier Monopoly Finding Against Google

The case was initially filed in January 2023 by the U.S. Department of Justice along with the attorneys general in some states. The government alleged that Google was a monopoly in a variety of digital advertising technology markets and was involved in practices that undermined competition.

On April 17, 2025, Judge Brinkema handed down her liability decision after 15 days of trial starting in September 2024.

The court ruled that Google had unlawfully monopolized the markets for publisher ad servers and ad exchanges. It also found that Google’s tying of its publisher ad server, DFP, to AdX violated antitrust law.

The court found a number of practices to contribute to the illegal stance of Google which included practices that concerned the way Google ad server and exchange related to competing exchanges.

The very initial case filed by the DOJ had claimed a far more extensive scale of anticompetitive conduct, such as acquisitions, limitation on competitor technologies as well as manipulation of auction systems. The last liability determinations ought to be differentiated, however, with those allegations that the court never determined independently.

The 2025 verdict thus confirmed that Google is liable in the antitrust in certain markets. The September 2026 proceeding dealt with the remedy to be granted. 

Behavioral Remedies Instead of a Forced Sale

The judge ultimately rejected the proposed structural remedies and instead accepted most of the proposed behavioural remedies, as modified by the court. Google had argued that separating its integrated ad-tech systems would be technically complicated and disruptive for customers. The court’s detailed reasoning remains temporarily under seal.

• Technical Complexity: In hearings, Google claimed that the disintegration of its integrated technology stack would cause critical technical upheaval to millions of businesses and publishers who depend on its offerings.

• Legality of Historical Acquisitions: Google argued that its acquisitions of DoubleClick and AdMeld were lawful at the time. The court ultimately rejected the government’s proposed structural remedies, while its detailed reasoning remains temporarily under seal.  

Proposed Behavioural Measures

The court’s detailed remedy package remains temporarily sealed, so the precise line-item requirements have not yet been fully disclosed. Public reporting has confirmed that the court accepted most of the proposed behavioural remedies, including measures involving real-time access to bidding information for competitors. 

What the Ruling Means for Publishers

The decision has a mixed outcome to news media outlets, independent blogs, and those who create digital content.

Short-Term Implications

• Stability in Operation: Publishers avoid the immediate disruption that could have accompanied a forced AdX divestiture.

• Improved Real-Time Access: Publishers will have an opportunity to increase competition on their ad inventory since rival ad exchanges will have real-time access to the information about bids, which could give rival exchanges greater opportunities to compete for publisher inventory. 

Long-Term Considerations

• Still Platform Dependence: Google will retain its advertising technology business, meaning publishers will continue to rely on Google’s infrastructure where they choose to use its services. 

• Industry Concerns: The media advocacy groups had their doubts whether behavioural rules are all that will be needed. Danielle Coffey, the President and CEO of the News/Media Alliance, said that although the court took positive behavioral steps, without the necessity to sell its advertising exchange, more will be required to reverse a decade of concentration in the market. 

What It Means for Advertisers and Ad-Tech Competition

The ruling also carries direct implications for advertisers and independent ad-tech companies:

Stakeholder	Key Takeaway	Potential Impact
Advertisers	Intact Ecosystem	Avoids market fragmentation while benefiting from potential fee transparency improvements.
Independent Ad Exchanges	Interoperability Gains	Gain real-time access to bid data, allowing them to compete more directly with AdX.
Demand-Side Platforms (DSPs)	Fairer Bidding Rules	Reduced self-preferencing by Google could lead to lower transactional friction across auctions.

Google’s Response and the DOJ’s Position 

Google’s Position

Google was happy with the court ruling of the refusal to break up. The company officials once again reiterated that an imposed sale of AdX would have caused technical strife and disturbed the equipment applied by millions of websites and companies every day. Google expressed that it would ensure that the required behaviour change is done without compromising the stability of its advertisement platforms. 

DOJ and Regulatory Response

The Justice Department said it was pleased that the court ordered substantial relief and indicated that it was evaluating appropriate next steps. In response, the department will keep battling on the issue of fair competition, Associate Attorney General Stanley Woodward declared in public that the department must make trade-offs in litigation between the short-term benefits in regulation of short-term behaviour and long-term litigation over structural breakups. 

Why the Decision Matters for Big Tech Regulation

This conclusion reflects a more extended trend in antitrust litigation of technology in the U.S. In several leading cases about powerful technology platforms, courts have been ready to convict platforms of committing illegal monopolization but reluctant to impose structural divestiture or company disintegration. 

The decision highlights the difficulty of imposing structural remedies in complex technology markets and puts greater emphasis on whether behavioural requirements can be effectively enforced. 

Conclusion

Judge Brinkema’s ruling ensures that Google will maintain its advertising technology business intact, avoiding the structural breakup sought by the U.S. government. However, the court’s imposition of behavioural remedies introduces new operational requirements intended to foster real-time competition and transparency for publishers and advertisers alike. As the redacted order becomes public in the coming weeks, the industry will gain further clarity on the precise rules governing the future of digital advertising.