Safari’s iOS 27 Block Cuts eCPMs 10.5% For Updated Readers. The Sitewide Hit Is About 1%
The first publisher data on Apple's Safari block shows eCPMs down 10.5% among readers who have updated.
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The Weekly
What actually moved in the market From the desk that operates the auctions
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- This was the week the first numbers arrived, and most of them said the measurement is the problem, not the inventory.This week
- This was the week the calendar, the court and the browser each set a deadline publishers did not choose, and the useful response was to prepare records and…
- This was the week the browser and the AI layer both took demand decisions out of the publisher's hands, and publishers started measuring their way back in.
- This was the week "who's actually deciding" became the question underneath almost every story.
- This was the week Google's ad tech ruling stopped being a number and became a calendar.
- This was the week control changed hands on every side of the auction at once.
- This was a quiet week for volume and a loud one for control.
- This was the week new supply showed up everywhere at once, and the platforms that already had it started taking the controls away from the people who buy it.
- This was the week the machines got their assignments and the humans got their notice.
- This was the week the open web’s referees stopped pretending to be neutral.
- This was the week the industry’s two underlying questions came due at once: who gets paid when machines read the web, and what the open market is actually worth.
- This was the week the market priced what publishers already knew.
- This was the week the leverage turned.
- This was the week the numbers stopped adding up.
- This was the week everybody bought the pipes.
- This was the week the bundles broke apart — and someone else started setting the price of your content.
- This was the week commerce bought the screen — and the ad became the checkout.
- This was the week the machines took the wheel — and the ad-tech hierarchy got redrawn at the same time.
- This was the week publishers got a switch — and watched the plumbing underneath them get rebuilt.
- This was the week the open web's reckoning stopped being a forecast and became a balance sheet.
- If last week was about upfronts, this week was about agents — and the bill they're handing publishers.
- This was upfronts week — but the bigger story is the agentic infrastructure being poured underneath it.
- Standards bodies put governance on the table.
23 issues so far, every Tuesday since 10 May 2026.
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