On September 2, Judge Leonie Brinkema declined to order Google to divest AdX or DFP — the exchange and ad server bundled inside Google Ad Manager — closing the remedies phase of the DOJ’s ad tech monopoly case with behavioral rules instead of a structural breakup. The case’s liability phase, decided in April 2024, had already found Google ran an illegal monopoly in the publisher ad server and ad exchange markets; this ruling is the “now what.”
01What the court actually ordered
- Behavioral remedies, not divestiture. Brinkema is imposing “most” of the DOJ’s proposed behavioral set: real-time open-web display bid data shared with rival ad servers, Unified Pricing Rules deprecated, publishers able to set different price floors per bidder inside GAM, and Google barred from using “first look” and “last look” privileges to adjust its own bids.
- Three broader categories, per the opinion’s structure: limits on self-preferencing, expanded data-sharing with publishers, and nondiscriminatory treatment of rival exchanges and ad servers.
- What she rejected: forced divestiture of AdX/DFP and open-sourcing GAM’s auction logic — reasoning that disrupting tools 92% of publishers, per Digiday, use for free risked more harm to small publishers than the fix, and that a breakup order would face years of stays while Google appealed.
- A scope gap the ruling doesn’t close: Google’s own remedy proposal covered only standard web banner ads, leaving video, CTV, and in-app out; the DOJ wanted all formats plus advertiser-side auction-code visibility. The full written opinion stays sealed for 14 days; parties then have 30 days to file a final judgment.
02What it means inside a GAM network
No forced migration — AdX and DFP stay exactly where they are, so nobody’s inventory stack changes overnight. But “no breakup” isn’t “no change” for day-to-day auction mechanics: removing Google’s “first look”/”last look” bid-adjustment privileges and handing publishers per-bidder floor control are both edits to how today’s auction actually clears, not cosmetic promises. Most GAM operators currently run one blended floor across demand sources; per-bidder floors are a real new lever, but the sealed opinion means effective dates aren’t public yet — this is a signal to start floor-strategy planning, not a rule already live in the auction.
Google keeps AdX and DFP intact — the scenario every GCPP partner has been quietly pricing in since the April 2024 monopoly finding landed in Google's favor.
03What publishers and buyers should do about it
04The bottom line
Google keeps AdX and DFP intact — the scenario every GCPP partner has been quietly pricing in since the April 2024 monopoly finding landed in Google’s favor. But the behavioral remedies Brinkema is ordering touch the exact mechanics — bid-adjustment privileges, floor-setting — that determine how existing GAM/AdX relationships actually pay out, once the sealed order names a date. Google, which signaled at trial it intends to contest every clause of whatever order issues, isn’t treating this as settled either.
AdExchanger, “Google Won’t Have To Break Up Its Ad Tech Business, Judge Brinkema Rules” (2 September 2026), for the ruling’s behavioral-remedy specifics (bid-data sharing, Unified Pricing Rules, per-bidder floors, first-look/last-look) and the April 2024 monopoly finding. Digiday, “Why Google’s ad business escaped a breakup” (3 September 2026), for the 92% free-GAM-usage figure, the self-preferencing/data-sharing/nondiscrimination remedy categories, the format-scope gap between Google’s and the DOJ’s proposals, and the 14-day sealed-opinion window. Adweek, “Google Won’t Be Forced to Break Up Adtech Biz, Even After Monopoly Ruling” (2 September 2026), for Google’s statement, the rejected divestiture/open-sourcing remedies, and the 30-day final-judgment filing window. The publisher/GAM operator analysis is APH desk analysis.