Christie's reported $6.2 billion in global sales for 2025, while Sotheby's closed the year at $7.0 billion, marking a combined inflection after two years of post-pandemic contraction. The rebound came not from packed salesrooms but from private treaty agreements and guaranteed-lot structures that now represent 41% of aggregate volume across both houses, up from 28% in 2023.
Public auction totals actually declined 12% year-over-year, with evening sales in New York and London drawing thinner bidding and lower sell-through rates. Christie's contemporary evening sales averaged 67% sold by lot, down from 74% the prior year. Sotheby's reported similar compression. What changed: both houses doubled their private-sale teams and underwrote trophy consignments with minimum-price guarantees backed by third-party risk partners. A Basquiat moved privately for $85 million in October never touched a salesroom. A Rothko changed hands in a December private treaty at an undisclosed sum north of $60 million. These transactions now anchor the revenue models.
The luxury pivot matters because it signals a structural shift in how ultra-high-net-worth sellers and buyers transact art. Public auctions expose pricing and ownership, creating tax and estate-planning friction. Private treaties allow anonymous settlement, flexible payment terms, and bespoke structures that mirror private-equity dealmaking. Both houses hired former Goldman Sachs and Citi private-banking veterans in 2024 to build out these desks. Christie's opened a dedicated private-sales floor in Hong Kong in November. Sotheby's launched a membership tier offering first-look rights on private inventory for annual fees starting at $250,000.
The comp-set shift extends beyond art. Both houses expanded jewelry, watches, handbags, and wine categories, which collectively grew 23% in 2025. A Patek Philippe Grandmaster Chime sold privately for $31 million in March. A Hermès Birkin collection moved as a single lot for $2.1 million in June. These aren't distressed sales—they're portfolio reallocations by families treating collectibles as liquid alternative assets. The houses now offer collateralized lending against these holdings, margin facilities that didn't exist three years ago.
Watch Christie's Q1 2026 Hong Kong sale week in late March and Sotheby's New York contemporary evening auction in May. Both will test whether public hammer prices can sustain $40 million-plus for blue-chip works without third-party guarantees. Also: Sotheby's is expected to file amended financials with its lenders by February 15, reflecting private-sale revenue classifications that shift EBITDA recognition timing. Any revisions to covenants will clarify how much balance-sheet capacity remains for future guarantees.
The tell isn't the headline sales number. It's the 41% private share and the $250,000 membership tier—both pointing to a market that no longer needs the theater of the gavel to clear nine-figure inventory.