How concentrated is the AI citation landscape? | Trakkr Research
It is concentrated at the top and fragmented underneath. One domain can own more than 6% of all citations, yet the index still spans 208,567 unique domains and 744,579 cited URLs.
Methodology: Built from the live citation index backing Trakkr Research, using 8,777,687 citations across 208,567 unique domains observed between October 3, 2025 and April 17, 2026.
Direct Answer
It is concentrated at the top and fragmented underneath. One domain can own more than 6% of all citations, yet the index still spans 208,567 unique domains and 744,579 cited URLs.
What this means
This answer matters because it turns a study finding into an operating rule teams can use when they decide what to publish, refresh, or measure next.
Evidence table
| Metric | Value | Why it matters |
|---|---|---|
| Wikipedia share | 6.43% | en.wikipedia.org alone accounts for 564,191 citations. |
| Unique domains | 208,567 | The citation surface is broad even though a small set dominates. |
| Unique cited URLs | 744,579 | AI systems repeatedly converge on a relatively small URL set. |
| Long-tail share | 84.51% | Most citations are spread across a very large long tail of domains. |
Frequently Asked Questions
How concentrated is the AI citation landscape?
It is concentrated at the top and fragmented underneath. One domain can own more than 6% of all citations, yet the index still spans 208,567 unique domains and 744,579 cited URLs.
Which numbers from Where AI Gets Its Answers matter most here?
Wikipedia share: 6.43%. en.wikipedia.org alone accounts for 564,191 citations. Unique domains: 208,567. The citation surface is broad even though a small set dominates.
What should a team do next?
Audit the domains that already dominate your category and decide which ones are realistic citation targets. Build source-worthy pages for the query shapes where AI is already citing third parties. Treat reference, review, and social sources as part of your AI visibility surface, not as noise.
What to do next
Related pages
Continue through the same study cluster.
- does ai rely more on reference sites than the open web - Related answer page
- does social content matter for ai citations - Related answer page
- the citation graph spans more than two hundred thousand domains - Related fact page
- top cited domain tracker - Related tracker page
Data & Sources
- Where AI Gets Its Answers - Flagship study behind this page
- Page JSON - Machine-readable companion file