Google keeps AdX, and the new bid transparency goes to publishers, not advertisers

A federal judge let Google keep AdX, rejecting the Justice Department's demand that it sell the exchange and ordering behavioral changes instead. One thing in that remedy matters for anyone buying media: nearly every disclosure it forces runs toward publishers, and almost none of it toward the advertiser.

U.S. District Judge Leonie Brinkema handed down the remedies decision on Wednesday, September 2, in the Eastern District of Virginia. It leaves her April 2025 liability finding untouched — Google illegally monopolized the publisher ad server and ad exchange markets, and the tying of the two was unlawful — while discarding the structural fix the government argued for at trial. Alphabet regulatory affairs VP Lee-Anne Mulholland said the company was "very pleased the Court rejected the DOJ's proposal to break apart tools that help small businesses reach new customers and grow," per Search Engine Land, which is owned by Semrush.

The full opinion is not public. Digiday reports it is sealed for 14 days while both sides screen it for confidential material, so nobody outside the case yet knows Google's exact obligations. What is on the record is that she adopted most of the behavioral remedies both sides proposed.

What the order actually changes

The package falls into three buckets, per Digiday's account of the trial filings: limits on self-preferencing, data-sharing with publishers, and nondiscriminatory treatment of rival exchanges and ad servers. The court had already found Google used two practices, "first look" and "last look," that let it reach inventory ahead of rivals and see competing bids before placing its own, and that it capped publishers' ability to set different price floors by demand source.

Those go away. MarTech reports publishers get more pricing control and rival publisher ad servers are expected to receive Google's AdX bid information in real time. That is a genuine change to auction plumbing.

It is also a change entirely on the sell side. Google's own offer extended real-time bid visibility to rival ad tech firms and let publishers slot an independent auction tool between its ad server and its exchange — but only for standard banner inventory, leaving out video, streaming TV and in-app. The DOJ asked for that visibility to reach advertisers too, plus a flat ban on self-favoring bid routing, publication of the underlying code, and an auction tool across every format. Where Brinkema landed between those positions is still under seal.

The transparency runs one way

MarTech's read is that for advertisers the effects will mostly sit "several layers below the campaign interface." If you market software and buy display or retargeting on the open web, the remedy gives you no new number. You still cannot see the take rate on a bid or the supply path an impression travelled, and you still get your performance reporting from the company running the auction.

Nothing in this order hands a buyer a figure they did not already have on Tuesday.

The carve-outs matter for the same reason. Video, connected TV and in-app were the excluded formats — and, as Digiday notes, markets where Google was never found to hold illegal power. A remedy scoped to standard display is scoped to the slice of the open web that was already commoditized.

Those figures — the first from Wedbush research on court filings via Search Engine Land, the second Google's own argument against divestiture — frame why the court balked. Brinkema questioned who would credibly buy the exchange, and whether anyone could describe the ad tech market three to five years out well enough to design a structural fix. Behavioral remedies, on her reasoning, start working within roughly a year even while an appeal runs; a divestiture order would be stayed for years.

What a software marketer should do about it

Almost nothing this quarter, which is itself the useful conclusion. No line in your Google Ads or DV360 account changes because of this ruling, and any vendor pitching a "post-remedy strategy" is selling you a sealed document they have not read.

What is worth tracking is adoption, not the order. MarTech makes the point plainly: if publishers move to competing ad servers and exchanges, buyers eventually get a more competitive supply market; if they stay put, the auction rules changed and the market structure did not. That is the only version of this story that will show up in your CPMs.

Enforcement is also not resolution. Digiday notes the remedies may start biting within a year to 18 months, but that is the beginning of years of argument over what compliance means — and a behavioral remedy leaves the monopolist administering its own correction.

• Do not rebudget on this news; the remedy touches auction mechanics, not campaign settings
• Watch publisher adoption of rival ad servers as the signal competition actually arrived
• Prove open-web display with incrementality tests, not platform-reported conversions
• Treat video, CTV and in-app as unaffected; the disclosure fight was scoped to standard display

One read should shape how much attention the next antitrust headline gets: this is the second time in about a year that a court found Google held an illegal monopoly and then declined to break it up. The channel you buy on is unlikely to be restructured by litigation on any timescale that matters to a plan. Build measurement that does not depend on the platform's honesty instead of waiting for a court to enforce it.