The biggest single regulatory question for the publisher ecosystem in 2026 remains unresolved: what remedies will the court impose on Google for unlawfully monopolizing the publisher ad server and ad exchange markets? With closing arguments in the remedies trial concluded on November 21, 2025, Judge Brinkema’s ruling is expected sometime this year — and as of mid-May 2026, the industry is still waiting.
For publishers, no other 2026 regulatory event has more potential to change daily life.
01A quick refresher
- April 17, 2025: Judge Leonie Brinkema found Google liable on two of three counts: unlawful monopolization of the publisher ad server market (DFP / Google Ad Manager) and the ad exchange market (AdX). The DOJ’s third count, on advertiser ad networks, was dismissed.
- September 2025: The remedies trial began.
- November 21, 2025: Closing arguments concluded.
- 2026: Awaiting the remedies ruling.
02What the DOJ is asking for
The Department of Justice has pushed for a mix of structural, behavioral, and administrative remedies:
- Divestiture of AdX, Google’s ad exchange.
- Open-sourcing the final auction logic of DFP / Google Ad Manager.
- “If necessary,” divestiture of the rest of DFP / GAM.
DOJ’s argument: nothing short of structural separation will durably stop the monopolistic conduct.
Google has pushed back with behavioral remedies — interoperability commitments, audit obligations, conduct restrictions — and argues that divestiture is excessive and operationally chaotic.
03What’s actually at stake for publishers
Three scenarios, each with very different consequences:
Scenario 1 — AdX divested, DFP open-sourced. This would dramatically reshape the supply path. AdX as a standalone exchange would have to compete on equal terms with Magnite, PubMatic, Index, OpenX, and others. Final auction logic in GAM becoming open-source would close the most opaque loop in the entire ad-server ecosystem, finally letting publishers and SSPs verify what’s happening at decision time.
Scenario 2 — Behavioral remedies only. Less disruptive day-to-day. Google retains ownership of GAM and AdX but operates under interoperability and conduct constraints, monitored by a court-appointed compliance authority. Likely outcome: incremental publisher leverage, not transformational change.
Scenario 3 — Structural divestiture of GAM in full. The most extreme outcome. The transition risk for publishers running on GAM today is significant. Operationally, this would force a multi-year migration plan and create real revenue uncertainty during the handover.
The judge's ruling will reshape the publisher ad-tech stack — to varying degrees depending on which path is chosen.
04What publishers should be doing now
Regardless of which scenario lands, three preparations are sensible right now:
05A note on timing
There is no public timetable for the remedies ruling. The judge may rule any week. The industry should treat May–October 2026 as the realistic window. A publisher that gets caught flat-footed on the day of the ruling has only itself to blame.
06The bottom line
The judge’s ruling will reshape the publisher ad-tech stack — to varying degrees depending on which path is chosen. The publishers who win in the post-ruling world are the ones who make themselves resilient to all three scenarios before the gavel falls. That preparation work is on you, this quarter.