Google Keeps AdX, but Europe Still Has Leverage

An Ad-Ops Lead Reads the Ruling

An EU publisher's ad-ops lead read the news on the morning of September 2, 2026: a US federal judge had decided that Google would not have to sell its AdX ad exchange. She worked for a mid-sized news publisher in Frankfurt, one of thousands across Europe whose programmatic revenue runs, in some share, through Google's stack. The headline read like a Google win, and in the narrowest sense it was. But her first question was not who won in Virginia. It was whether anything in her own auction logs would look different next quarter, and if so, when.

That question turned out to be harder to answer than the ruling itself. US District Judge Leonie Brinkema, sitting in the Eastern District of Virginia, rejected the Department of Justice's push to force Google to divest AdX. Instead she accepted most of the parties' proposed behavioral remedies: rules requiring Google's ad tech to interoperate with rival platforms. For a publisher outside the United States, that distinction between a forced sale and a rule requiring better cooperation with rivals is the entire story.

What Brinkema Actually Ordered

Judge Brinkema's September 2, 2026 order follows directly from her own finding, issued in April 2025, that Google held illegal monopolies in two connected markets: the publisher ad-server market and the ad-exchange market. That earlier ruling established the violation. This one decided the remedy, and the two are not the same question. A court can find a monopoly illegal and still choose not to break up the company that holds it.

The Justice Department wanted a structural remedy: a forced sale of AdX, the exchange that matches publisher ad space with advertiser bids in real time. Brinkema declined. She accepted, largely as proposed, behavioral remedies instead - interoperability requirements meant to let rival ad-tech platforms plug into Google's systems on fairer terms. AdX itself is not a small piece of Google's business in absolute dollars, but it is a small piece of Google relative to the rest of the company: about 4.1 percent of Google's 2020 revenue and 1.5 percent of its operating profit, the most recent figures made public in the case (more current numbers were redacted in the filings). That size gap is part of why a divestiture always looked like a survivable outcome for Google, and why a behavioral remedy looks, to some critics, like a mild one.

The ruling also marks the third straight US antitrust case in which a court has stopped short of ordering a Big Tech breakup, favoring conduct rules over structural separation.

The Real Divergence Is Between Washington and Brussels

The most important fact in this story never appears in a US courtroom filing: Google has already offered, separately, to sell AdX to settle a parallel European Commission antitrust investigation into the same ad-tech business. Put those two facts next to each other and the interesting question stops being whether Google won. It becomes why Google would offer Europe more than a US court just required.

We think the answer is leverage, and that it now runs in Europe's favor. A structural remedy - an actual sale - was never off the table for Google. The company put it on the table itself, in Brussels, before this US ruling landed. That means EU regulators are not negotiating from a position of wondering whether Google would ever accept a divestiture; they already know the answer is yes, because Google itself made the offer. The US outcome does not weaken that leverage. If anything, it clarifies what the fallback looks like: behavioral remedies are the softer option Google will take if it can, and a sale is the harder one it will concede if pushed hard enough. Brussels has already seen Google concede it. Washington did not ask.

For European publishers and advertisers, this is not an academic distinction. Whichever regime's remedy actually reaches Europe first, and in what form, will decide how their auctions run. A US interoperability rule does not automatically extend to Google's European ad stack. A European structural remedy, if the Commission pushes for one, would.

Behavioral Remedies Are Hard to Check From the Outside

Interoperability requirements sound precise on paper and are notoriously difficult to verify in practice. A forced sale is binary: either Google owns AdX or it does not, and a regulator, a journalist, or a competitor can confirm which is true by checking who holds the asset. A behavioral remedy is not binary. It asks whether Google's auction logic, its data-sharing terms, and its technical interfaces treat rival ad-tech platforms fairly over time, across millions of auctions a rival platform cannot fully see from outside.

That asymmetry favors the regulated party. Google will know, in granular detail, whether it is complying. The rivals the remedy is meant to protect, and the regulators meant to enforce it, will largely have to take Google's technical account of its own systems on faith, or spend years building the monitoring capacity to check it independently. That is not a reason to assume the remedy will fail. It is a reason European publishers and advertisers should not assume compliance is automatic just because a court ordered it.

What Changes for European Ad Buyers and Publishers Now

Nothing in Google's European ad-tech stack changes today because of this US ruling. The order applies to the American case; the European Commission's investigation into Google's ad-tech business remains open and separate, and Google's earlier offer to sell AdX there still stands as a live option on the table. What the US ruling does change is the reference point European regulators now negotiate against.

We expect the practical test to play out over the next several quarters: whether Brussels treats the US outcome as a ceiling on what it should ask for, or as proof that Google will go further when the pressure is applied directly. Publishers and advertisers running programmatic spend through Google's stack in the EU and UK have no immediate action to take, but they have a clear reason to watch the European case more closely than the American one from here.

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