US Court Bars Google Ad Exchange From 'Last Look' Bidding Advantage
· 2h ago · Originally reported by PPC Land
A US court order has prohibited Google's ad exchange from using 'last look,' a practice that allowed the platform to view competitors' highest bids before placing its own in ad auctions. The ruling removes what critics called an unfair advantage in programmatic advertising bidding.
Why it matters
Last look gave Google an edge no other bidder had, potentially suppressing competition and inflating costs for advertisers who use real-time auctions to buy digital ad space.
Explain it like I’m new here
It's like being able to peek at everyone else's sealed bid at an auction before deciding how much you want to offer — a US judge just said Google can't do that anymore.
Terms in this story
Last look
Last look is an auction advantage in which one bidder sees the best competing bid before bidding, so it can win by bidding just slightly more.
Ad exchange
An ad exchange is a digital marketplace where buyers and sellers of ad impressions meet and trade through automated auctions, usually in real time.
Programmatic advertising
Programmatic advertising is buying and selling ad space through automated software, usually one impression at a time, instead of through manual negotiations, phone calls and paper contracts.
Go deeper
Related stories
Explainer: How Google's Performance Max campaigns work and where ad fraud risks may lurk
A new explainer breaks down Performance Max, Google's fully automated campaign type that spreads budgets across Search, Display, YouTube and other placements. It then asks whether the format's limited transparency and reporting controls…
Google Ads to Auto-Apply Merchant Coupons to Search, Performance Max Campaigns
Starting October 12, Google Ads will automatically apply website coupon offers to eligible Search and Performance Max campaigns that use location assets. Sourced offers are rechecked within 24 hours, though the review process for what goes…
Google Ad Manager's Unified Pricing Rules: A Look Back at the Retired Floor-Price System
Google Ad Manager's unified pricing rules (UPR), a single floor-price mechanism for non-guaranteed demand, launched in 2019 and was retired in December 2025. The system allowed publishers to set one minimum price across all open auction…
DOJ and Google Clash Over Timeline to Open Ad Exchange to Rivals
The DOJ wants Google to open its ad exchange to competitors within six months, while Google proposes a 12-month timeline. Under Google's wording, non-US publishers could face waits of up to 24 months, extendable by local law. Key details…
DOJ and Google clash over deadline to open AdX to Prebid in ad tech case
Google and the Department of Justice have each filed competing proposed final judgments in the ad tech antitrust case. The DOJ wants Google's AdX exchange to support Prebid within six months, while Google is asking for twelve. The two…
DOJ and Google Clash Over Ad Tech Antitrust Remedy Timeline and Oversight
The U.S. Department of Justice and Google are at odds over the timeline and oversight structure for addressing Google's dominance in the ad tech stack, following the court's ruling that Google holds an illegal monopoly in the sector.