The AI Share of Voice Index benchmarks how often AI answer engines cite aggregators, brand sites and user-generated content across four commercial verticals. The method: we ran 500 real buyer-intent prompts through 2000 model calls (2026-06-21), recorded every source each answer cited, and classified each cited domain as an aggregator, a brand/publisher site, or user-generated content. Across the full sample, the average answer cited 9.6 sources, 84% of which were UGC, and 60% sat outside the top 10 Google organic results for the same query.
The tables below break that same method out by vertical: coverage (the share of prompts that returned a citable AI answer), average sources cited per answer, aggregator share, UGC share, and the top five most-cited domains with aggregators flagged.