Citation share is not market share.
Buyers no longer start in a search box. They start in a chatbox — asking ChatGPT, Claude, Perplexity, Gemini, and Google's AI Overviews what to buy, who to hire, which company to trust. The brand the engine names is the brand that enters the consideration set. The brand it skips never gets a chance.
5W built the AI Visibility Index to measure that surface category by category. This release covers thirteen published studies — and read together, they tell one story. The market leader is rarely the citation leader. America's largest airline by capacity ranks fifth in citations. The maker of the world's best-selling drug ranks fifth in its category. The hotel chain with the most U.S. properties barely registers. The world's largest luggage maker trails a newer challenger. In every category, the AI answer defaults to the brands with the deepest editorial record, the strongest consumer consensus, and the clearest owned position — not simply the brands with the most revenue, capacity, or distribution.
That is the opportunity. Capacity and market share are slow to move and expensive to buy. Citation share is built — in earned media, reference accuracy, and the structured, AI-retrievable record of who a brand is and what it leads. The studies below each rank a category, name the winners and the brands falling behind, and lay out the playbook. Start anywhere.
The May 2026 AI Visibility Index drop.
"Across these industries the finding does not change. The brand that leads the market is not always the brand AI names first — and the brand AI names first is the one that wins the buyer. Citation share is the new scoreboard. It is not bought with ad budget or capacity. It is built — in earned media, in accurate reference data, in the structured record of who you are. Build it before your category's buyers finish their next search."Ronn TorossianFounder & Chairman, 5W
One method, multiple categories.
Each study analyzes more than 60 real buyer prompts across six sub-categories of its market, running every prompt five times per engine in clean, logged-out sessions across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews. Citation share is the estimated proportion of brand mentions a brand receives across all tracked prompts — the core ranking metric. Each study names the top 25 brands, the winners, the brands falling behind, the structural findings, and the playbook.
On the numbers. Citation-share percentages in this release are 5W directional estimates of relative visibility, based on frequency of brand mention across tracked prompts and stated as such in every study. They are not precise market measurements. Final measured figures are produced through 5W's full multi-engine measurement process and are swapped in on update.About this release
5W AI Visibility Index — May 2026 Release. Thirteen published installments in the 5W AI Visibility Index series, covering Pharma/Rx, Home Services & Improvement, Health Insurance & Medicare Advantage, Airlines & Hotels, Fitness & Wellness Apps, Functional Beverages, Sports Nutrition & Protein, Luxury Watches, Home Security, Luggage, Non-Alcoholic Drinks, Project Management & Work Tools, and Website & E-commerce Platforms. Each measures AI citation share across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews for 60+ category queries tracked in Q2 2026. The studies are published ungated and built to be cited.
