Publisher ad supply fell by up to 40% in Q2 2026, according to new Ozone benchmarking data covering about 20 billion impressions, shared exclusively with Digiday on July 15. Ad request volumes dropped 32% to 37% year over year in the US and 39% to 41% in the UK, as zero-click search cut the flow of traffic to open-web sites.
What the Ozone publisher ad supply report found
The data comes from software Ozone runs for a group of premium publisher members, including the Guardian, News UK, and Dow Jones’ Wall Street Journal. It tracks how many ad opportunities those sites see and what they sell for, between April and June 2026.
The supply drop is the economic footprint of falling referral traffic. As search and social platforms send fewer clicks out to publisher sites, there are fewer pageviews, and fewer ad calls to sell against. “Platforms, particularly Google, are intervening in the user journey and providing content in situ rather than redirecting to the underlying website as they used to with classic search,” said Danny Spears, chief operating officer at Ozone.
Spend has held up better than volume because prices are rising. In June, average eCPMs were about 30% higher year over year in the UK and 7% higher in the US. Even so, combined programmatic spend across Ozone’s US and UK publisher cohort fell 30.6% year over year in the first half of 2026. UK spend fell 14.3% as higher yields bridged the gap. US spend fell 44% on a smaller yield bump.
The category detail matters for B2B. In the US, B2B technology and betting and gaming pulled back hardest, even as the same categories grew in the UK. Apps were the only channel to grow in June, with US spend up about 23% and eCPMs up roughly 42%.
Where the publisher ad supply data comes from
The benchmarking data was published by Digiday on July 15, 2026, in reporting by Jessica Davies, drawing on Ozone figures shared exclusively with the outlet. Ozone stressed the data reflects its publisher members’ inventory, and not Ozone’s own ad sales.
How zero-click search is reshaping B2B discovery
The Ozone numbers put a supply-side price tag on a shift B2B marketers have watched all year. SparkToro data showed 68% of Google searches now end without a click, and Google’s AI-first results have changed what the search bar even is. At the same time, AI platforms are building their own paid surfaces, with OpenAI testing multi-advertiser ads inside ChatGPT. Discovery is moving into AI answers and walled gardens, and open-web display inventory is thinning as a result. Publishers are responding by cutting ad load, raising prices on what remains, and leaning into apps, subscriptions, and newsletters where they control the audience.
Talking Shift: the open web your display budget rents is getting smaller
Here is the part of this story most coverage will miss. The open web was never just an ad channel for B2B brands. It was a discovery engine, and that engine is losing fuel. Start Some Shift’s position is that every lost ad call in this data is also a lost human research moment, because the buyer who once clicked through to a publisher page now gets the answer inside an AI result. That is exactly the shift the Binary Buyer Audit measures: whether your brand shows up, accurately, when machines assemble the answer before a human ever sees your ad. Display reach can shrink 40% and your pipeline can survive. Vanishing from the AI answer is the loss that compounds.
What falling publisher ad supply means for B2B marketers
The decline is structural, so treat it as a planning input rather than a blip:
- Audit how much of your awareness budget depends on open-web display reach that is shrinking by a third or more.
- Reprice your benchmarks, since eCPMs are up 30% in the UK and buyers are paying more for less inventory.
- Shift discovery investment toward AI-answer presence and owned channels that do not depend on referral traffic.
- Remember the competitive slot: scarcer premium inventory means your placement sits closer to direct competitors, so give the reader a specific reason your ad wins the click.
- Watch category signals, because US B2B technology budgets pulled back hardest in this dataset.
- Test app, newsletter, and logged-in environments where publishers still control discovery and attention.
What to watch next in open-web advertising
Ozone’s data showed early signs of US stabilization in June, but the two biggest DSP pipes, DV360 and Amazon DSP, were still declining. Watch whether Q3 request volumes level off, and whether more publishers follow the subscription and app pivot. If they do, premium open-web inventory will keep getting scarcer and more expensive.
