In 2017, 78 of the stories we collected at Advertising Perspectives were about header bidding. By 2021 there was one.
That isn’t the curve of a technology that failed. It’s the curve of one that won so completely it became plumbing. Header bidding is now just how the open web sells its inventory, and nobody writes headlines about plumbing.
It’s also, as far as we can tell from the past decade of trade press, the last time publishers as a group used technology to take power back from the companies in the middle. Everything since has moved the other way. Understanding why is the best guide we have to where publishers’ leverage comes from next.
The count
Stories in our archive that mention header bidding, by year:
| Year | Stories |
|---|---|
| 2016 | 7 |
| 2017 | 78 |
| 2018 | 21 |
| 2019 | 16 |
| 2020 | 13 |
| 2021 | 1 |
| 2022 | 8 |
| 2023 | 4 |
| 2024 | 9 |
| 2025 | 1 |
One spike, then a long tail. The small bump in 2024 isn’t a revival. It’s the courtroom, where header bidding came back as evidence.
2016–2017: Publishers take back the auction
For years, publishers sold their remnant inventory through a waterfall. The ad server offered each impression to one exchange at a time, usually Google’s first, and moved down the list only if the price wasn’t met. It was orderly, and it guaranteed that the company at the top of the waterfall saw everything first.
Header bidding broke that. A bit of code in the page asked many exchanges to bid at once, before the ad server made its call, so the highest bid could actually win. By August 2016 even Facebook was trialing header bidding as part of a sell-side push, and AdExchanger framed what was at stake as the fight for control of the publisher ecosystem.
It wasn’t free. Digiday warned publishers to beware of page latency, since every extra bidder added time before an ad could load. One AdExchanger contributor argued it was time to stop talking about the yield benefits and look at the full cost. None of that slowed adoption. By December 27, AdExchanger was calling 2016 the year header bidding went mainstream.
2017 was the peak. Within two weeks of the new year, header bidding was going server-side to fix the latency problem. Publishers like SheKnows built their own wrappers to see exactly who was bidding what. By November, Amazon was pitching publishers its own wrapper. When the biggest companies in the market start offering to run your new auction for you, you’ve won something.
2017–2019: The other side adjusts
Every shift in leverage gets a response, and this one got three.
The buyers answered with supply-path optimization. If the same impression was now being offered through a dozen exchanges at once, buyers saw the same ad slot many times over and paid a fee on every path. In May 2017 Digiday asked what supply-path optimization even was. By September, AdExchanger called it the buy side’s answer to header bidding: cut the number of exchanges you buy through and send more money down fewer pipes.
The auctions themselves changed. Header bidding exposed how second-price auctions could be gamed, and the market moved to first-price. Criteo gave publishers a first-price option in its direct bidder in May 2017. By October, programmatic was preparing for the first-price auction era, and in December Rubicon joined the first-price club. Early in 2019, Digiday’s research found that header bidding and first-price auctions were boosting publisher revenues. That’s the high-water mark of the story.
Google built its own version. Its server-side alternative, Exchange Bidding, became Open Bidding in 2019. It brought outside exchanges into Google’s auction, but on Google’s servers and under Google’s rules.
2020–2024: From the auction to the courtroom
After 2019, header bidding stopped making news as a technology. Prebid, the open-source standard that won, kept growing quietly, especially when times were hard. In the spring of 2020, as revenue fell, AdExchanger reported that more publishers were giving Prebid a look.
The next time header bidding showed up in force, it was in legal filings. In December 2020, a group of states led by Texas filed an antitrust complaint against Google alleging anticompetitive ad tech policies and collusion with Facebook. Facebook had been one of header bidding’s most prominent supporters in 2016. The deal at the center of the complaint, known as Jedi Blue, had regulators in the EU and UK seeing red by 2022.
Meanwhile, the buyers kept consolidating the supply chain from their side. In 2022 The Trade Desk launched OpenPath to connect directly to publishers, and a year in it described the result as “a clean, unadulterated supply chain.” Clean for the buyer, certainly. For the exchanges that header bidding had invited into the auction, it was a sign that the largest buyers could simply go around them.
In August 2024, the Justice Department won its search case against Google, and AdExchanger noted that ad tech was next. The ad tech trial opened in September, with testimony on the fraught rollout of Google’s unified pricing rules, a 2019 change that stopped publishers from setting different price floors for different buyers. That was one of the main tools publishers had used to make header bidding work in their favor.
2025: The ruling, and the open question
In April 2025, Google was ruled a monopoly in the publisher ad server and ad exchange markets. Digiday’s headline captured how publishers felt: they remained unsure of what comes next. In May the Justice Department proposed that Google sell AdX and DoubleClick for Publishers, and at the remedies hearing in September, Judge Brinkema asked for less ad tech “window dressing” in the debate. PubMatic filed its own suit the same month.
Whatever the final remedy, notice what it is. Years after publishers took back their auctions with a piece of JavaScript, the fight over who controls the sell side is being settled by a federal judge. Publishers aren’t driving it. They’re waiting on it.
Where the leverage went
Look at the decade as a whole and a pattern shows up. Header bidding gave publishers leverage by making the auction more competitive. Every move since has been about who gets to stand closest to the buyer.
The buyers answered with supply-path optimization and direct paths like OpenPath, which, as Digiday reported in September 2025, rising competition has started to make The Trade Desk bend a little on. Google answered with Open Bidding and pricing rules that are now part of a court record. The independent exchanges answered by moving into curation, packaging audiences and data on the sell side. OpenX said data-driven curation is changing programmatic buying, and in October 2025 Index Exchange launched a data marketplace for sell-side curation.
The common thread is that the auction stopped being where the advantage lives. An AdExchanger contributor put it in one line in October 2025: data, not auctions, will decide the fate of the open web.
We agree, and we’d go a step further. The next revolution publishers can win won’t come from a better auction. It will come from knowing their own audiences better than anyone in the middle does.
The next lever is the audience
Publishers are sitting on something no exchange or DSP can manufacture: logged-in readers, subscription and newsletter relationships, and years of engagement history, collected with consent. The smart ones already know it. In 2024 AdExchanger described the New York Post turning first-party data into direct deals.
The obstacle is rarely the data. It’s the operation around it. Most publishers can tell you their total audience. Far fewer can tell a sales lead, in the middle of a pitch, which segments fit a particular advertiser, how big they are this week and what they’re worth. That answer lives in a data team’s queue, and by the time it comes back, the buyer has bought somewhere else.
Many publishers have already done the hard engineering: subscriber, engagement and commerce data unified in a CDP or a data warehouse. What’s missing is the commercial layer on top.
Header bidding gave publishers a fair auction. The next advantage belongs to the publishers who can price their own audiences faster than anyone in the middle.
Every headline in this piece links to the original story. Browse the full archive of header bidding coverage, or the related coverage of supply-path optimization, Prebid and curation.
Kevin Reynolds is the founder of Advertising Perspectives, MadTech Consulting and data4orce.ai. He is a marketing technology architect and C-level advisor, with a focus on Salesforce and data-driven advertising.