Prestige Makeup Brands: AI Market Discovery Index

Benchmark Summary

Charlotte Tilbury leads valid recommendation coverage in September 2026 at 46.8%, down from 51.6% in August 2026. The gap to the next brand, Armani Beauty at 36.1%, narrowed to 10.7 points from 13.7 points in August 2026.

The largest coverage decline was NARS Cosmetics, which fell to 23.0% from 28.4%, a move beyond normal month-to-month variation. The largest coverage increase was Hourglass Cosmetics, which rose to 19.8% in September 2026 from 18.5% in August 2026, within normal variation.

Most tracked brands moved modestly within normal month-to-month variation. NARS Cosmetics was the only brand with movement beyond normal variation.

The benchmark began with 800 prompt-surface observations in each month and produced 631 qualified observations in September 2026 after qualification, down from 675 in August 2026.

Current Benchmark at a Glance

Qualified surface breadth counts the canonical AI/search surface families with at least one qualified observation: ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode. All six families were present in both months.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Prestige Makeup Brands

Research Scope and Qualification

The public benchmark is narrower than the raw collection universe by design.

Brand-level percentages use the qualified observations as the public denominator, not the raw collection. AI Market Discovery Methodology

Current Brand Standings

This table shows the primary current-month benchmark view, sorted by valid recommendation coverage.

How to Read the Standings

• Presence rate: share of qualified observations where the brand appears in the AI response.
• Valid recommendation coverage: share of qualified observations where the brand receives a valid recommendation in the answer.
• Top-three rate: share of qualified observations where the brand appears among the top three recommended options.
• Rank-one rate: share of qualified observations where the brand is the first recommendation.
• Net sentiment: positive minus negative mention tone, scaled by total mentions.

For formulas and denominator rules, see AI Market Discovery Metric Definitions.

Recommendation Coverage Movement

Largest Increase: Hourglass Cosmetics

Hourglass Cosmetics recorded the largest coverage increase this month, rising to 19.8% valid recommendation coverage in September 2026 from 18.5% in August 2026, a move of 1.3 points that remained within normal month-to-month variation. No other brand posted a larger increase.

Largest Decline: NARS Cosmetics

NARS Cosmetics fell to 23.0% valid recommendation coverage in September 2026 from 28.4% in August 2026, a decline of 5.4 points that extends beyond normal month-to-month variation. The brand's presence rate also declined, to 36.8% from 43.1%, and its top-three rate fell to 8.2% from 11.6% in the same period. These moves were each beyond normal variation.

Category Leader: Charlotte Tilbury

Charlotte Tilbury remained the category leader in September 2026 with 46.8% valid recommendation coverage. The brand declined 4.8 points from 51.6% in August 2026, though that move remained within normal month-to-month variation. Charlotte Tilbury also retained the highest presence rate at 69.4% in September 2026, down from 71.4% in August 2026.

Nine of the ten tracked brands moved within normal month-to-month variation this month; NARS Cosmetics was the only brand with movement beyond normal variation.

Recommendation Placement Snapshot

Coverage alone does not show how prominently a brand is recommended. Among the leading brands, placement rates reveal different strengths.

Armani Beauty and Charlotte Tilbury had nearly identical top-three rates in September 2026, but Armani Beauty's rank-one rate of 15.5% exceeded Charlotte Tilbury's 9.0%. Similar coverage levels can still hide different first-position rates.

Buyer-Intent Distribution

All qualified observations fell into the Brand Recommendation class in both months.

The current public series measures brand-recommendation discovery and does not yet contain qualified observations in the pricing or multi-brand comparison classes.

Historical Measurement Record

This is an evergreen benchmark URL. New measurements are added to the same report.

Evidence and Source Layer

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure:

• Market share or sales attributable to AI recommendations.
• Every possible AI response to a given query.
• Organic-search ranking on traditional search engines.
• Social media mention volume or sentiment outside AI surfaces.
• Private or sponsored channels, including brand-owned assistants.
• Causality from a metric movement alone; the benchmark records changes but does not establish why they occurred.

About This Benchmark

The LLM Authority Index AI Market Discovery Index tracks how AI and search surfaces recommend brands within a category, measuring presence, recommendation coverage, placement, and sentiment across six canonical AI surface families each month.

• AI Market Discovery Methodology
• AI Market Discovery Metric Definitions
• AI Market Discovery Research Standards
• Modeled AI Authority Value

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