A first look is a priority right to bid on a publisher's ad impression before any other buyer gets the chance. It exists because inventory is sold in a fixed order, and the demand source at the front of that order sees each impression before its rivals do. The term has two working senses. In commercial use, it describes a deal in which a publisher offers a chosen buyer early access, usually through a deal ID. In ad server use, it describes a routing setting, most closely tied to Google Ad Manager, that lets bids from selected demand serve ahead of other demand once they clear a floor. The second sense became a legal term when Judge Leonie Brinkema ruled on April 17, 2025 that Google had monopolised the publisher ad server and ad exchange markets, with First Look, Last Look and Unified Pricing Rules among the practices that disadvantaged competitors.

How first look works in the ad server

Every ad request reaches an ad server, the software that decides which advertisement fills a slot. The server ranks demand by priority. In Google Ad Manager, guaranteed line items occupy priorities 1 to 10, while remnant line items and Ad Exchange demand share priority 12 and house ads sit at 16, according to Google's help documentation. Dynamic allocation lets non-guaranteed demand compete with guaranteed campaigns impression by impression, using a temporary CPM (cost per thousand impressions) that stands for the opportunity cost of not serving the guaranteed line item.

First Look alters that ranking for bids that pass a price floor. Under Google's help page, a First Look bid must clear the First Look floor and the value CPM of any remnant line item that dynamic allocation selects, but it need not clear the temporary CPM set for a guaranteed line item. Publishers can expose or block select inventory through targeting, set the floor above which a bid may serve ahead of reservation inventory, and set pricing and blocking options for chosen advertisers or brands. Ad operations staff on the sell side make those settings; exchanges and demand-side platforms (DSPs) on the buy side see more or fewer impressions as a result.

The commercial version rests on the same principle, with a contract attached. Publisher and buyer agree a deal ID and a price in advance. When a matching impression appears, it is offered to that buyer first; if the buyer declines or bids below the asking price, the impression drops into the standard auction, according to the glossary of vendor SmartyAds. In a preferred deal, the price is fixed and the buyer gets first look, but nothing is reserved and the buyer need not purchase. Preferred and guaranteed deals share one Ad Manager module, Programmatic Direct, and both use auction type 3 in OpenRTB (Open Real-Time Bidding), the protocol that carries bid requests between exchanges and buyers. The underlying categories were set out by the IAB Programmatic Publishers Task Force on September 19, 2013: automated guaranteed, unreserved fixed rate, invitation-only auction and open auction.

Origin and evolution

The mechanism is older than its public label. The DoubleClick Ad Exchange (AdX) opened on September 18, 2009 with real-time dynamic allocation. Index Exchange, in a complaint filed on November 10, 2025, dates first look to 2010 and describes it as the first opportunity to acquire any impression before other exchanges could bid. The court's account, in its April 2025 memorandum opinion, is more specific. A publisher using DoubleClick for Publishers (DFP), the ad server later folded into Ad Manager, had to give AdX the chance to buy before any rival exchange could bid, and the logic was built into the auction software so that publishers could not switch it off. AdX bid in real time while competitors' bids were set in advance, so an AdX bid of $1.07 could beat rival offers of $1.10 and $1.08. By early 2014, the court found, AdX was winning 53% of the publisher inventory that DFP made available.

Header bidding was the workaround. Matt Kendall and Paul Yang at AppNexus built Prebid.js in early 2015, and Prebid.org became an independent body on September 11, 2017. Running the auction in the page, before the ad server call, put rival exchanges ahead of AdX in the sequence. Google's answer, in the court's telling, was Last Look, which in Judge Brinkema's words let AdX "open the envelope for the winning bid". Teads' complaint puts Last Look at 2014 to 2019.

Google's own use of the phrase pointed elsewhere. On April 13, 2016, Jonathan Bellack, Google's director of product management, announced that First Look was available to all DFP clients and said more than 200 partners had tested it in beta. Google reported double-digit percentage gains in programmatic revenue for publishers such as Gannett and Scripps. In April 2017, Greenlight Digital reported that exchanges, AdX included, would declare final bids at the same moment, with the highest price winning.

The court places the removal of Last Look in 2019, later than that report, alongside the arrival of Unified Pricing Rules, which barred publishers from setting a higher floor for AdX than for other exchanges while leaving higher floors on rivals permissible. PPC Land dates the rules to March 6, 2019, the day of the unified first-price auction, with a cap of 100 per network; Press Gazette dates them to April 2019. The European Commission fined Google 2.95 billion euros on September 5, 2025 for favouring its own ad tech since 2014. Google then removed Unified Pricing Rules in December 2025, before any remedy was ordered, and Ad Manager's pricing rules page now allows 200 rules per network.

Why it matters to marketers

Sequencing, not price alone, decided which bids were seen. In the court's example, the highest bid lost. The opinion also records that AdX adjusted its take rate impression by impression, at 15% or lower for competitive impressions and 25% or higher for less competitive ones, averaging about 20%. DFP held 91% of the publisher ad server market, per the April 2025 ruling. Private litigation now turns that finding into damages claims. Raptive sued on October 17, 2025 in the Southern District of New York. On October 27, 2025, Judge P. Kevin Castel cleared publishers including Associated Newspapers, Mail Media and Gannett to pursue damages without re-proving liability. Teads sued on August 3, 2026, alleging that 6.88 trillion impressions were lost to rival exchanges between 2017 and 2023. That figure is an allegation in a complaint, not a finding.

Limitations and disputes

The definition is not settled. Google's 2016 announcement presented First Look as a publisher-controlled yield tool with floors and targeting. The court described a feature publishers could not turn off. Index Exchange dates the practice six years before Google's announcement. Public sources do not reconcile whether these describe one mechanism that changed over time or separate ones. Google's help page for First Look carried no deprecation notice when retrieved in October 2026, although the remedies bar reimplementation in open-web display auctions.

Scope is narrow. The restriction, as both sides have drafted it, covers programmatic open web display auctions inside DFP and AdX, according to AdExchanger's reading of their proposed final judgments. Other formats are not addressed in that wording. The commercial form has a limit of its own: a preferred deal sells a place in the queue, not delivery.

Google, through vice president Lee-Anne Mulholland, said it was pleased that the court rejected a breakup of its ad tools. On the remedies, the parties still disagree on timing: the Department of Justice wants AdX opened to Prebid in six months and Google asks for twelve, and the Department wants global application from the start against Google's request for 24 further months. A PubMatic chief executive testified that integration could take up to 15 months.

Not the same as

Last look is the mirror image: a final chance to bid after rivals have committed, with sight of the winning bid. First look is early access; last look is late information.

Preferred deal is the negotiated form for one buyer at a fixed price with no reservation. Programmatic guaranteed commits volume and takes reservation priority above preferred deals, private auctions and the open auction.

Dynamic allocation is the Ad Manager mechanism through which non-guaranteed demand competes with reservations in real time. First Look is a setting inside that sequence.

First-price auction concerns how the winning bidder is charged, not who is asked first.

Outside ad tech, a first-look deal in film and television gives a studio the first right to consider a producer's project before it is offered elsewhere.

Recent developments

On September 2, 2026, Judge Brinkema declined to order the sale of AdX and accepted behavioural remedies instead. They include a ban on first look and last look on open-web display inventory, deprecation of unified pricing rules, and real-time AdX bid data for rival ad servers. The decree runs six years rather than the 15 the government sought, and applies worldwide. In a scorecard, publishing consultant Scott Messer counted that all 19 conduct provisions in Google's September 2025 proposal were adopted, 16 unchanged and three modified, and rated only four as high-value for publishers.

Earlier, Google's Tim Craycroft had testified that Google would commit not to rebuild First Look or Last Look. The deadline for a joint final judgment was October 2, 2026. On October 5, 2026, the parties filed competing language; both agree that first look and last look cannot be reimplemented, and the open points are timing, data access and the monitor's authority.

Timeline

  • September 18, 2009: DoubleClick Ad Exchange opens with real-time dynamic allocation
  • 2010: Index Exchange's complaint dates first look to this year
  • Early 2014: AdX wins 53% of the publisher inventory DFP makes available, according to the court
  • 2014: Start of the Last Look period alleged by Teads, which runs to 2019
  • Early 2015: Prebid.js is built at AppNexus
  • April 13, 2016: Google announces First Look to all DFP clients
  • April 2017: Greenlight Digital reports Google's exchange bidding in dynamic allocation, described as ending Last Look
  • September 11, 2017: Prebid.org becomes an independent organisation
  • 2019: Last Look removed and Unified Pricing Rules introduced (March 6 or April, depending on source)
  • April 17, 2025: US court finds Google monopolised two ad tech markets
  • September 5, 2025: European Commission fines Google 2.95 billion euros
  • November 10, 2025: Index Exchange sues Google
  • December 2025: Google removes Unified Pricing Rules
  • September 2, 2026: Court bars first look and last look on open-web display inventory
  • October 5, 2026: DOJ and Google file competing final judgment language

Summary

Who. Publishers and their ad operations teams set it up; exchanges and DSPs bid into it. Google, through DFP and AdX, is the operator most identified with it, and Judge Brinkema, the European Commission, Index Exchange, Teads and Raptive are the main parties in the disputes.

What. A priority right to bid on an impression before other demand, either as a deal between publisher and buyer or as a routing setting in an ad server. Google's version is now barred on open-web display inventory.

When. In use from at least 2009 to 2010 by the accounts of the court and Index Exchange; announced by Google as a feature on April 13, 2016; condemned on April 17, 2025; prohibited by order on September 2, 2026.

Where. Inside publisher ad servers and exchange auctions, and in deal ID arrangements carried through OpenRTB. The remedies apply worldwide.

Why. Early access to the best impressions has commercial value, for the buyer who gets it and for the publisher who sells it. Courts and regulators concluded that, when the seller of the ad server also owns the exchange, the same ordering shut rivals out.