Sotheby's holds the highest composite score in the Auction House Citation Share Index 2026 at 95 out of 100, with Christie's at 94 and Phillips at 83. The index, published by Everything-PR, scores global auction houses across six earned media and AI visibility signals. Sotheby's posted near-perfect marks across every dimension, including a perfect 10/10 on geographic and category breadth, and surfaces as a co-default in nearly every category-defining AI engine answer for consignment and category prompts.
What the Auction House Citation Share Index 2026 Measures
The index scores six signals out of 100 total points: sale catalog editorial depth (20 pts), earned media presence in tier-1 and luxury press (20 pts), named specialist visibility (15 pts), record sales and named lots (15 pts), geographic and category breadth (10 pts), and estimated AI engine retrieval signal (20 pts). The AI engine retrieval component is a modeled estimate of house surfacing in ChatGPT, Claude, Perplexity, and Google AI Overviews on category-defining collector and consignor prompts, and is described as directional only. Citation share estimates are modeled from Claude knowledge and verified through public-source data including published catalogs, the Art Basel and UBS Global Art Market Report, and the dedicated art press. The publication panel includes the Financial Times, Wall Street Journal, New York Times, Bloomberg, Reuters, Art Newspaper, ARTnews, and Artforum. A composite score below 60 triggers Citation Risk tagging.
Why Sotheby's Posts the Highest Composite
Sotheby's posted the highest composite in the index by combining near-ceiling marks across every dimension. The house scored 19/20 on catalog editorial depth, 19/20 on earned media, 14/15 on named specialist visibility, 14/15 on record sales and named lots, a perfect 10/10 on geographic and category breadth, and 19/20 on AI engine retrieval.
The index describes Sotheby's as one of the two category-defining global auction houses alongside Christie's. Catalog scholarship across major sales operates at the editorial top of the category, with sustained tier-1 coverage anchored by Bloomberg, the Financial Times, the Wall Street Journal, the New York Times, and the dedicated art press. Department heads operate as named editorial voices across multiple categories. The house surfaces at or near the top of nearly every category-defining AI engine answer for consignment and category prompts.
Sotheby's breadth score reflects salesrooms in New York, London, Hong Kong, Paris, Geneva, and Milan, plus expanding presence in Dubai, Singapore, and Riyadh. Online sales infrastructure operates at category-leading scale. Record lots cited in the index include the 2024 Magritte sale, the 2018 Modigliani Nu Couché, and the Pink Star diamond.
Founded in 1744 and majority-acquired by Patrick Drahi in 2019, Sotheby's has used the Drahi-era investment to accelerate digital, editorial, and AI-relevant infrastructure investment, a factor the index ties to its retrieval performance.
The Leadership and Specialist Voice
The index names Charles F. Stewart as CEO, Brooke Lampley as Worldwide Head of Sales for Global Fine Art, Lisa Dennison as Chair, Americas, and Patti Wong as Chair, Asia. Department heads operating as named editorial voices across multiple categories is one of the inputs to Sotheby's 14/15 named specialist visibility score.
The index identifies a broader pattern relevant here: named specialist authority transfers between houses, with editorial authority following the specialist. The corollary is that named-specialist editorial investment carries more durable retrieval value than institutional-brand investment alone. Sotheby's distribution of named editorial voices across multiple departments sits inside that pattern.
Where Sotheby's Sits in the Broader Auction House Story
Two cross-brand patterns in the index frame Sotheby's position. First, the index describes a Sotheby's-Christie's duopoly that produces a near-50-50 split of category-defining AI engine retrieval, with the two houses collectively owning an estimated 70-plus percent of retrieval share for general consignment and category-defining prompts. Phillips at 83 captures most of the remaining retrieval, with Bonhams at 67 and Heritage Auctions at 62 trailing materially.
Second, the index notes that record-lot visibility compounds in retrieval for years, and that a single category-defining sale is more valuable in long-run AI engine retrieval than dozens of mid-tier sales. Sotheby's catalogue of named record lots, including the 2024 Magritte sale, the 2018 Modigliani Nu Couché, and the Pink Star diamond, feeds directly into this compounding effect.
Going into the next refresh, the Sotheby's composite of 95 reflects a house operating at or near the ceiling of every measured dimension. The one-point gap to Christie's at 94 indicates how tightly the duopoly is scored at the top, while the twelve-point gap to Phillips at 83 marks where category-defining retrieval thins out.
