Google Keeps Its Ad Stack: What the Brinkema Remedies Change Inside the Auction

If you sell ad inventory on a website or buy open-web display through a DSP, Google's exchange has been the part of the auction you could not see inside. A federal ruling on September 2, 2026 leaves that exchange with Google but is set to change some of its rules, exactly where publishers set prices and buyers win or lose impressions.

What the court decided, and what is still sealed

Judge Leonie M. Brinkema of the US District Court for the Eastern District of Virginia rejected all three structural remedies the Department of Justice sought in United States v. Google (case 1:23-cv-108): selling the AdX exchange, open-sourcing the final auction logic of DFP, Google's publisher ad server, and a contingent sale of the rest of DFP, according to PPC Land. She accepted most of the parties' proposed behavioral remedies, as modified by the court. In April 2025 she had found that Google willfully monopolized the publisher ad server and ad exchange markets, Al Jazeera reports.

PPC Land, citing reporting on the day of the ruling, describes her objections to a sale as practical: no obvious buyer, a market moving faster than a three-to-five-year divestiture, appeals that would delay relief for years, and possible harm to small publishers who use DFP without charge. With the opinion sealed, that is a summary, not the court's published reasoning.

The full reasoning sits in a sealed Memorandum Opinion. Redaction requests are due September 16 and a joint proposed Final Judgment by October 2, according to PPC Land, with the judge resolving any disputed provisions, Digiday reports.

What changes in the auction

AdExchanger describes four commitments Google itself proposed: real-time AdX bid amounts for open-web display made available to rival ad servers, Unified Pricing Rules deprecated, per-bidder price floors in Google Ad Manager, and no use of first look or last look to adjust its open-web display bids. PPC Land, presenting the list as ordered, adds equal latency and data signals across pathways, and no revenue-share differences based on a publisher's ad server.

Index Exchange, which sued Google in November 2025, described first look as giving AdX the first opportunity to acquire any impression before other exchanges could bid, and last look as the ability to see the winning bid and bid after everybody else, PPC Land reports. While last look operated, a strong bid on another exchange could lose at the final step to one its buyer never saw. Google says it stopped using both years ago, AdExchanger notes, so this item bars their return rather than changing today's auction.

Unified Pricing Rules arrived in 2019 with Google's first-price unified auction, and PPC Land notes publishers lost the ability to price different demand sources differently. Per-bidder floors would restore that: a higher floor for a bidder that reliably values the audience, a lower one for a new demand partner under test.

The bid-data remedy targets a switching problem. Jay Friedman, who testified as a DOJ witness at the 2024 trial, doubts the ruling solves it:

If rival ad servers see AdX bids in real time, a publisher could in principle change ad server without dropping Google's demand from the price comparison. That only works if the latency and data parity items survive into the Final Judgment; a bid that arrives late or with thinner signals still loses.

What stays the same

Google keeps both AdX and DFP. Al Jazeera reports publishers pay Google a 20 percent fee to sell through AdX; no reported remedy sets that fee.

Several reported items are limited to open-web display, so check whether the Final Judgment keeps that language; it decides which line items the rules reach. Prebid is also open: AdExchanger notes critics proposed forcing AdX into Prebid.org and Google signaled support, but it is not among the reported remedies.

Nor is the dispute over. Google says it will appeal the underlying liability ruling. Lee-Anne Mulholland of Google 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.” The DOJ said on X that it was “one step closer to restoring competition” and is evaluating next steps. PubMatic said in a statement it expects the remedies to “establish a level playing field for all market participants.”

What to do before October 2

At closing arguments in November 2025, Google's lawyer Karen Dunn argued behavioral relief could be implemented within twelve to eighteen months, according to PPC Land. No start date is public yet, and your auctions are unlikely to change this month. Use the gap to build baselines.

• Publishers: export current Unified Pricing Rules and floor settings, and record AdX win rate and average clearing price by ad unit, so you can tell later whether yield moved or merely shifted between demand sources.
• Publishers: design per-bidder floor tests with a holdout group of ad units, ready to run once the setting exists.
• Agencies and advertisers running programmatic buying on open-web display: log win rate and clearing price by exchange. If per-bidder floors and shared AdX bids change how publishers route demand, it will show there first.
• Everyone: read the redacted opinion and the proposed Final Judgment for scope, start dates, compliance monitoring, and whether latency and data parity are enforceable.
• Hold structural decisions, such as switching ad servers, until the Final Judgment is filed and Google's appeal path is clearer.

Digiday suggests the clearest measure of impact will be market behavior: publishers using more rival infrastructure, independent platforms gaining activity and, over time, changes in Google's share. Your own auction logs will show that before any market report does, and they belong in the same conversation as rebalancing your paid media mix across platforms.