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How Often Do Google’s AI Overview Sources Change? What the Research Shows

Studies from Ahrefs, BrightEdge and Authoritas disagree on how stable AI Overview citations are. Here is what they found and what it means for you.

A common question about Google’s AI Overviews is how stable the sources are. If you earn a citation today, will you still have it next quarter? We did not run our own tracking study for this piece, so instead we pulled together what the published research says, and where the studies disagree.

The short version

  • Citations churn. Authoritas reported that about 70% of the pages cited in AI Overviews change over a two-to-three-month period.
  • Rankings matter, but less than you might think. Studies disagree on how much cited pages overlap with top-ranking pages, from about 17% to 54%, depending on the method.
  • The overlap has moved over time. Ahrefs found the share of cited pages that rank in the top 10 fell from 76% in July 2025 to 38% in March 2026.
  • Google fans out queries. A single question is split into related sub-queries, and pages that appear across those results get cited.

What Ahrefs found

In July 2025 Ahrefs found that 76% of pages cited in AI Overviews also ranked in Google’s top 10. By March 2026, across 863,000 keywords and 4 million cited URLs, that fell to 38%, with 31.2% of citations from positions 11 to 100 and 31.0% from beyond position 100. Ahrefs offers two reasons: better parsing that catches citations it previously missed and Google’s query fan-out process, where a page can rank well for a related sub-query without ranking for the exact one.

What BrightEdge found

BrightEdge measured the opposite trend over a longer period: overlap between AI Overview citations and organic rankings grew from 32.3% in May 2024 to 54.5% in September 2025. It varied widely by industry, from 75.3% in healthcare and 71.0% in B2B tech to 19.2% for restaurants and 22.9% for e-commerce. A separate BrightEdge analysis from February 2026 put top-10 overlap at about 17% using a different method.

How much AI Overview citations overlap with organic rankings

Two studies, two methods, two directions. Compare each study only with itself.

Ahrefs: cited pages in top 10, Jul 2025
76%
Ahrefs: cited pages in top 10, Mar 2026
38%
BrightEdge: overlap with organic, May 2024
32.3%
BrightEdge: overlap with organic, Sep 2025
54.5%

Sources: Ahrefs (via Search Engine Journal) and BrightEdge. The studies define “overlap” differently and use different keyword sets, so their numbers are not directly comparable.

Why the studies disagree

ReasonWhat it changes
Different definitionsOne counts a cited page ranking in the top 10 for the query; another counts any organic ranking overlap.
Different keyword setsIndustry mix matters: healthcare and B2B tech overlap heavily, restaurants and e-commerce barely.
Different measurement datesGoogle changes how Overviews are built, and tools improve their detection.
Query fan-outPages can be cited for sub-queries the study did not measure.

What this means for you

  • Do not rely on one snapshot. A citation is not a permanent asset. Recheck your target questions monthly.
  • Keep ranking, but do not stop there. Traditional SEO remains the entry ticket, especially in trust-heavy industries.
  • Cover the related questions. Because of query fan-out, a page that answers the surrounding sub-questions has more chances to be picked.
  • Refresh what works. Update your cited pages with new data and visible dates.
  • Track with a log. Our guide to tracking your brand in AI answers shows how to build one in an afternoon.

Want a baseline for your own site? Talk to us or try the free AI Visibility Checker. For more on the losses behind this, see AI Overviews Are Stealing Your Clicks.

Sources: Search Engine Journal on the Ahrefs study, BrightEdge and IDEAVA’s roundup for the Authoritas figure. Reviewed in September 2026.

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