Research Report · AI Search

AI Search & Zero-Click: A 60-Domain Longitudinal Study.

Published: April 2026 Dataset: 60 client domains Timeframe: 18-month longitudinal
AI search impact

The question

AI Overviews, ChatGPT search, Perplexity, and Claude have been accused of destroying publisher traffic. The data is mixed, the panic is loud, and most reporting is anecdotal.

We tracked 60 client domains across SaaS, DTC, media, and local services for 18 months to see what AI search actually did to traffic — and which strategies are working for domains gaining share despite the shift.

Aggregate findings

-18%Median click-through rate change on informational queries
+2.3%Median click-through rate change on transactional queries
+37%Share of citations in AI Overviews for top performers
31%Of domains grew traffic through the window

Who's winning and who's losing

Losing: Low-differentiation informational content

Domains that primarily published general informational content ("What is X?", "How to Y") saw significant traffic declines. Median: -34% on affected pages over 12 months. AI Overviews are good at summarizing well-covered topics without clicks required.

Winning: Original research + utility content

Three content types showed stable or growing traffic:

Growing: Branded search capture

Branded search grew across the dataset. The theory: AI assistants expose users to specific brand names in their summaries, which drives branded searches to the site. Clients investing in brand marketing saw this effect disproportionately.

What's working for AI citation

Of the 60 domains, 11 significantly grew their share of citations in AI Overviews. Common characteristics:

Three strategic shifts worth considering

Methodology note: We used Google Search Console click/impression data plus third-party AI Overview visibility tracking (Semrush AIO coverage). Causality is partially inferred — we can observe that CTR dropped on queries where AI Overviews now appear, but can't fully isolate AI Overviews as the cause from other SERP changes.
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