Sotheby's record first-half 2026 total of $4.4 billion, its strongest H1 ever, combined with consistent performance across New York, London, Hong Kong, and private sales channels, underpins the strong 81% market-implied odds for it to finish the year ahead of Christie's. Christie's $4.5 billion H1 edge stemmed largely from standout single-owner collections such as the S.I. Newhouse sale, but Sotheby's broader regional depth, 90% sell-through rates, and recent fall auction momentum in contemporary and luxury categories have shifted trader consensus toward sustained leadership. Key catalysts ahead include the remaining 2026 marquee seasons and year-end private transaction tallies, where Sotheby's pipeline breadth offers a clearer path to the higher annual aggregate.