Observed Signal · Sep 29, 2026 · Policy Update · Source: AdExchanger · Impact: 5/5 · Sentiment: Negative
Apple iOS 27 Blocks The Trade Desk from Serving Safari Ads
Apple's latest operating system, iOS 27, released on September 14, has blocked The Trade Desk from serving ads on the Safari browser for Apple devices. The block extends beyond identity matching domains, affecting adsrvr.org, The Trade Desk's core ad request and delivery domain. This effectively prevents the DSP from accessing Safari inventory on iOS 27 devices. The Trade Desk has filed an urgent bug report with Apple's WebKit team, which is investigating the issue. Other vendors like ID5, Audigent, LiveRamp, and Permutive were also added to the blocklist, but the impact on The Trade Desk is more severe as it halts ad delivery, not just identity resolution. The outcome could be either an accidental block that gets resolved or a deliberate policy that signals a significant threat to programmatic advertising on the open web.
Apple's move directly impacts a major DSP's ability to monetize Safari inventory, potentially signaling a broader crackdown on programmatic advertising and identity-based targeting in the open web.
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Key Takeaways & Evidence Grounding
- Apple's iOS 27, released on September 14, blocks The Trade Desk from serving ads on Safari.
- The block includes adsrvr.org, The Trade Desk's core ad request and delivery domain.
- Other vendors added to the blocklist include ID5, Audigent, LiveRamp, and Permutive.
- The Trade Desk filed an urgent bug report with Apple's WebKit team.
- Apple is investigating the issue, but no resolution has been announced yet.
Connected Companies & Entities
10 Entities mapped“The Trade Desk is unable to serve ads to the Safari browser for Apple device owners that have downloaded iOS 27....”
“Apple has been investigating the issue since last week....”
“Other tracking services that were added to Apple’s block list this month include ... ID5....”
“Other tracking services that were added to Apple’s block list this month include ... Audigent....”
“Other tracking services that were added to Apple’s block list this month include ... LiveRamp....”
“Other tracking services that were added to Apple’s block list this month include ... Permutive....”
“The Trade Desk’s WebKit bug report includes an ad call for a yahoo.com non-private browsing session......”
“Google’s bids, though, went through cleanly....”
“In the past, Apple has made targeted changes to its ad tracking policies that suddenly laid low advertising systems operated by Meta......”
“In the past, Apple has made targeted changes to its ad tracking policies that suddenly laid low advertising systems operated by ... Criteo....”
Ontology Mapping & Concepts
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