What Is Citation Share?

Citation share is your domain's citations expressed as a percentage of all citations that AI engines issue across your category's answers. If engines cite 500 total sources across a tracked prompt set in a week and 40 of those citations point to your domain, your citation share is 8%. It is a zero-sum, competitive metric: every point you gain, someone else — a competitor, a review site, a publisher — loses.

Why measure share instead of just rate?

Citation rate can rise while your competitive position falls. Suppose engines start citing more sources per answer across the board: your rate climbs, but if competitors' citations grow faster, you are losing the category. Share normalizes for that. It answers the question executives actually ask — "who owns the sources AI trusts in our space?" — the same way share of voice answered it for media budgets. Pairing citation share with competitor analysis per prompt reveals exactly which domains are absorbing the citations you want.

How does citation share differ from mention share?

The two metrics track different assets:

A common and dangerous pattern in B2B: strong mention share driven by model memory, near-zero citation share because G2, Reddit threads, and competitor comparison pages supply the actual sources. The engine names you, but third parties define you.

How do you grow citation share?

Since share is competitive, growth means displacing incumbent sources. The proven plays: publish original data that becomes the primary source for category statistics (original research is the most-cited content type in AI answers); build definitive comparison and pricing pages engines prefer over affiliate content; and win citations on high-frequency prompts first, because a small set of head prompts generates a disproportionate slice of total category citations. Citation tracking at the prompt level shows where displacement is realistic.

Example

In a tracked HR-software category, G2 holds 22% citation share, a competitor's blog 9%, and your domain 3%. Publishing an annual salary benchmark report lifts your share to 11% in one quarter — mostly taken from generic publisher citations, not from G2.