Google Escapes Forced Breakup Despite Judge Finding Illegal Monopolies

Google Wins Crucial Antitrust Battle As Judge Refuses To Break Up Ad Empire

Google Has Now Survived Two Major Breakup Attempts

Google has escaped one of the most serious threats ever posed to its advertising empire. On September 2, 2026, US District Judge Leonie Brinkema rejected the Justice Department’s attempt to force Google to sell its AdX advertising exchange, despite previously finding that the company had illegally monopolised crucial parts of the online advertising market.

The ruling does not erase Google’s antitrust defeat. It does something arguably more consequential: it allows the company to keep ownership of the infrastructure at the centre of conduct a federal court already found unlawful, while relying instead on behavioural restrictions intended to prevent the abuses from continuing.

The Government Won The Case — But Lost The Breakup

The Justice Department and a coalition of states sued Google in January 2023 over the technology that powers much of the advertising sold across ordinary websites. Unlike Google Search advertising or YouTube advertising, the case focused on the machinery sitting behind the open web: publisher ad servers, advertising exchanges and the systems connecting websites with advertisers.

In April 2025, Brinkema handed the government a major victory. She found that Google had unlawfully maintained monopoly power in the publisher ad-server market and the open-web display ad-exchange market, and had unlawfully tied its publisher ad server to AdX.

The court concluded that Google’s conduct harmed publishers, damaged the competitive process and ultimately hurt consumers of information on the open web. Yet when the case reached the question that could have fundamentally changed Google’s business — what should actually be done about it — the government could not secure the structural remedy it wanted.

Brinkema declined to force Google to sell AdX.

That distinction matters. Finding a monopoly unlawful establishes liability. Breaking the monopoly apart changes who owns the infrastructure.

The government achieved the first. It failed to secure the second.

What Google Was Actually Found To Have Done

Online display advertising involves an extraordinarily fast chain of transactions. When someone opens a webpage, advertising technology can conduct an auction in fractions of a second to decide which advert appears, which advertiser wins and how much the publisher receives.

Google operates on several sides of that system.

Its publisher ad technology helps websites manage advertising inventory. AdX acts as an exchange connecting buyers and sellers. Google also brings enormous advertising demand into those auctions through other parts of its ecosystem.

That vertical integration became the heart of the government’s case.

Brinkema found that Google used its power across the advertising stack in ways that made competing exchanges less effective and strengthened the dependence of publishers on Google’s own products. The April 2025 decision found that Google had unlawfully tied its publisher ad server and AdX together.

One number helps explain why regulators cared so much about that position.

AdX has maintained a roughly 20% publisher revenue share for transactions running through the exchange. Brinkema’s liability opinion found that the durability of that 20% rate, despite technological maturity and evidence that customers struggled to switch away, supported the conclusion that Google possessed monopoly power.

The court also examined how Google gave AdX access to advertising demand that rival exchanges could not obtain on equivalent terms. That made AdX extremely difficult for publishers to avoid even when competitors offered alternatives.

The problem, therefore, was never simply that Google owned a successful advertising platform.

The court found that Google had used the relationship between different layers of its advertising machinery to preserve monopoly power.

Why AdX Matters To The Open Web

For ordinary internet users, AdX is almost invisible.

For publishers, it sits much closer to the economic foundations of the web.

News organisations, blogs, forums, information sites and countless independent publishers depend on digital advertising to fund free content. Every percentage point taken by intermediaries can affect the amount ultimately reaching the organisation producing that content.

The Justice Department argued when it filed the case that Google controlled critical technologies used by publishers to sell advertising and by advertisers to buy it. Its original complaint portrayed the company as occupying multiple positions in the same transaction — effectively operating important infrastructure on both sides of the market while also controlling the exchange between them.

That concentration is why the remedies phase mattered more than an ordinary corporate fine.

A fine leaves ownership unchanged.

Divestiture would have separated part of the machine.

Why The Judge Refused To Force A Sale

The Justice Department wanted Google to divest AdX and proposed other structural measures intended to unwind the consequences of its monopoly conduct. Government proposals had also included open-sourcing important parts of the publisher ad-server auction logic and potential further divestiture if competition was not restored.

Google fought that approach aggressively.

The company argued that separating integrated advertising products would be technically difficult, disruptive and potentially damaging to publishers and advertisers using them. Google said structural remedies went beyond the court’s liability findings and argued that interoperability changes could address the court’s concerns without breaking up the business.

Brinkema ultimately rejected the forced sale.

The detailed remedies decision was initially issued under seal, meaning the complete mechanics of the behavioural restrictions were not publicly available when the ruling first emerged. Early reporting indicated that the court accepted most of the parties’ proposed behavioural remedies while refusing the government’s demand for AdX divestiture.

That distinction should prevent anyone from describing the result as Google simply walking away untouched.

It did not.

But Google kept the asset the Justice Department most wanted removed from its control.

Google Has Now Survived Two Major Breakup Attempts

The significance becomes clearer when the ad-tech decision is placed beside Google’s other enormous American antitrust battle.

In a separate case involving internet search, federal courts found that Google unlawfully maintained monopolies in general search and general search-text advertising. The Justice Department later pushed for structural relief that included divestiture of Chrome.

That breakup attempt failed too.

Instead, Google was prohibited from entering certain exclusive distribution agreements and required to provide qualifying competitors with specified search data and syndication access. Google kept Chrome.

Now it has kept AdX.

The pattern is becoming difficult to ignore.

American antitrust authorities have proved extraordinarily serious allegations against one of the most powerful technology companies in the world. Courts have accepted major parts of those cases and made formal findings of unlawful monopolisation.

Yet when regulators have attempted to convert those victories into forced divestitures, judges have repeatedly preferred restrictions on behaviour over corporate surgery.

That creates a fundamental question about modern antitrust law: what does victory actually mean if a monopolist can be found to have unlawfully preserved its market power yet still retain the assets through which much of that power operates?

Behavioural Remedies Put Enforcement At The Centre

There is a legitimate argument for judicial caution.

Breaking apart deeply integrated technology systems is not comparable to ordering a company to sell an ordinary subsidiary. Advertising auctions operate at extraordinary scale and speed. Publishers depend on those systems every day, and badly designed structural intervention could produce technical disruption and unintended consequences.

Google made precisely that case.

But behavioural remedies create their own problem.

Instead of removing the incentive to favour one part of an integrated business over another, regulators may have to police whether a company is complying with rules telling it how those businesses can interact.

That changes the battle from ownership to supervision.

The effectiveness of the ruling will therefore depend heavily on what Brinkema’s final public remedies actually require, how they are monitored and whether competitors can realistically use the opportunities those restrictions are designed to create.

Weak interoperability obligations could leave the underlying market structure largely intact.

Strong ones could still alter how publishers and rival exchanges compete without requiring a breakup.

Until the full order is public, declaring either outcome would go beyond the evidence currently available.

The Bigger Question For American Antitrust

The Google litigation now highlights the enormous distance between proving unlawful monopoly conduct and dismantling the structure surrounding it.

That matters well beyond Google.

The United States is simultaneously pursuing major competition cases involving some of the largest technology businesses in history. Amazon and Apple remain the subject of major federal antitrust litigation, while the government’s attempt to force structural change at Meta has also faced judicial resistance.

Each case turns on different facts and legal theories. They should not be treated as interchangeable.

But together they are testing whether twentieth-century antitrust law can impose structural change on twenty-first-century technology platforms whose products, data and infrastructure have become deeply interconnected.

The precedent emerging from Google is uncomfortable for regulators.

Winning liability does not guarantee a breakup.

Proving monopoly maintenance does not automatically mean separating the businesses involved.

And even when a court accepts that competition was substantially harmed, judges may decide that attempting to reconstruct a complicated technology market creates risks greater than imposing rules on the incumbent.

That makes enforcement slower, more technical and potentially more dependent on regulators continuing to supervise companies long after the headline courtroom victory.

What Happens Next

Google has previously said it disagrees with Brinkema’s original liability decision and intends to appeal once the remedies process allows it to do so. The government will also have to assess whether the remedies go far enough to restore competition and whether further appellate litigation is justified.

The immediate question is what the unsealed remedies order actually contains. The difference between strict interoperability requirements, meaningful restrictions on self-preferencing and relatively modest operating changes could determine whether rivals gain genuine room to compete or Google merely adjusts the way its existing empire operates.

For Google, however, the largest immediate danger has passed.

The company was found to have illegally monopolised key advertising-technology markets. The US government asked a federal judge to break apart part of that system. And after years of litigation, thousands of pages of evidence and one of the most important technology antitrust cases in decades, Google still owns AdX.

That may ultimately become the most consequential fact of the entire case.