Christie's and Sotheby's reported combined global sales of $15.8 billion for 2025, up 11 percent from the prior year, with the final quarter accounting for $4.2 billion of that total. The growth came almost entirely from lots above $10 million and a sharp expansion in private treaty sales, which doubled year-over-year to $2.1 billion across both houses. Sotheby's reported full-year sales of $8.1 billion, while Christie's posted $7.7 billion, reversing a three-year trend in which Sotheby's trailed.
The final quarter saw fourteen lots sell above $50 million, including a Basquiat at $67 million and a Patek Philippe reference 1518 at $24 million. Private sales activity, traditionally concentrated in January and June, spread across the calendar with December alone accounting for $620 million in off-auction transactions. Both houses noted sustained demand from Asian buyers, who represented 38 percent of buyers by value in the fourth quarter, up from 31 percent in Q4 2024. Meanwhile, lots priced between $500,000 and $2 million saw sell-through rates fall to 64 percent, down from 72 percent a year earlier, signaling a bifurcation between trophy hunting and speculative hesitation.
The private treaty expansion matters because it reflects structural changes in how ultra-high-net-worth collectors transact. Auction houses now function as year-round intermediaries, not seasonal event operators. Sotheby's disclosed that 47 percent of its private sales were negotiated without the object ever appearing in a public catalog, a model that compresses deal timelines and avoids the reputational risk of a passed lot. Christie's separately noted that 22 percent of its private transactions involved buyers who had never registered for a live auction, suggesting the format is broadening the addressable market rather than cannibalizing it. The shift also insulates revenue from the calendar lumpiness that historically complicated capital planning and staffing.
For allocators, this confirms that collectibles are moving from passion purchases to asset-class infrastructure. The houses are embedding themselves in estate planning, lending, and valuation services that generate recurring fees independent of hammer prices. Sotheby's financial services division reported $1.9 billion in outstanding loans as of year-end, up 19 percent, with an average loan-to-value ratio of 48 percent. Christie's did not disclose equivalent figures but noted a 34 percent increase in appraisal engagements, many tied to trust and estate work. The implication: collectibles are being professionalized at the holder level, not just the transaction level.
Operators should track Q1 2026 sell-through rates for mid-tier lots and monitor whether private sales maintain their December pace or revert to seasonal norms. Sotheby's has flagged a major Impressionist private treaty expected to close in late February, which would set a directional tone for the spring calendar. Christie's will host its first Hong Kong evening sale on March 18, a test of whether Asian demand can sustain outside traditional May and November windows. Both houses are staffing up advisory teams in Singapore and Dubai, signaling expectation of continued geographic and temporal dispersion.
The auction houses are no longer event operators. They are now financial intermediaries with a collectibles overlay, and the $2.1 billion in private sales is the number that funds the infrastructure.
The takeaway
Auction houses posted $15.8B in 2025 sales as private treaty doubled and mid-market lots weakened; collectibles are professionalizing.
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