Nicholas Serota and Norman Rosenthal say that selling off the works is a “grave mistake”

The auction houses' bottom lines suffered from unsold lots, continuing a trend of top-lot discernment during New York’s fall sales

We talk to David Hockney about Portrait of an Artist (Pool with Two Figures), which broke an auction record this week, selling at Christie's New York for $90.3m with fees. Produced in association with Bonhams, auctioneers since 1793.

Dr Frederick Banting wanted to take up art full-time, but he was killed in a plane crash during the Second World War

With only two lots unsold, the auction house nets $362.6m in evening of avid bidding

A double pool portrait, estimated at $80m and offered at Christie’s with no reserve, could set a record for the most expensive work by a living artist

At $317.8m, the Ebsworth evening sale becomes one of the top five most valuable collections ever sold at auction

Monet carries Christie's evening sale while a Magritte shines at Sotheby's, marking an auction record for the Surrealist painter

Third-party auction deals have made some people very rich—but they may be bad for the market in the long run

Guarantees can be lucrative, but in the face of savvy competition, novices can get burnt when backing works as a third-party

New York auction topped by Monet's Le bassin aux nymphaés, sold to an Asian buyer at $31.8m

The “snake jug” shattered the previous record for Anna Pottery, a niche favourite of Americana collectors

Chicago’s aborted effort to sell Kerry James Marshall’s public work teaches us something about the transactional nature of today’s culture

The judgement comes after two experts found the painting was made with modern synthetic pigments

The work was one of 18 to have been placed under a court order following a financial dispute unrelated to the auction

Two-day auction will include works by Picasso, Matisse, Egon Schiele, collected by Bernd Schultz over six decades

With no auction precedent and little primary market data, Christie's sale of a work made by an algorithm tests demand

The 20-lot sale spans the auction house's New York and London locations and includes works ranging from Old Master paintings to a Monet

The Japanese carved toggles feature in his 2010 memoir The Hare with Amber Eyes

Now being sold by a London-based collector at Christie's New York, the work will probably go to Japan or China

Girl With Balloon canvas ‘self-destructed’ live at Sotheby’s last week in one of the most publicised stunts in auction history

Middle Eastern and South Asian works owned by embattled Dubai-based private equity firm carry much lower estimates than prices paid a decade ago

Sotheby’s New York to sell Sleep which inspired the rapper's video fro Famous

Just when we thought Frieze week was all over, twists and turns provide high drama at Sotheby’s contemporary evening sale on Friday night

Brexit and Trump's trade war with China are affecting the mood of buyers

Girl with a Balloon (2006) had just hammered at £860,000

Francis Bacon's lighter depiction of George Dyer leads auction at £17.5m, with strong prices for Hurvin Anderson, Bridget Riley and Albert Oehlen

The curvaceous M indicates a work that is "subject to right of first refusal"

Profits from the sale will support new UK arts education programme in 2019

The work, commissioned in the 1990s for $10,000, is due to be sold at Christie’s, New York for an estimated $10m to $15m