Andy Link says sculpture for which he demanded £5,000 in ransom was later stolen from him. Banksy’s former dealer says otherwise

We talk to German artist Anselm Kiefer about his new works inspired by String Theory and ask expert Scott Reyburn why the art market is treading water. Produced in association with Bonhams, auctioneers since 1793

Record prices were set for Charles White, Brice Marden, and Wayne Thiebaud, while a Clyfford Still painting prompted a prolonged bidding war

The Grace House Mural becomes the first and only such site-specific work by the artist to be sold at auction

The non-profit art space derives half its annual income from the charity gala which last year raised a record HK$7.8m

Work depicting Roman heroine Lucretia was in a private collection for 40 years

Work acquired by Van Gogh Museum in Amsterdam and the Drents Museum in Assen is one of few to survive from the artist's visit to Drenthe

Ed Ruscha's visual pun Hurting the Word Radio #2 rose to $46m, a new world record for the artist, but most lots barely reached their estimate in a slow sales season

The newly private auction house led the night's lots with its known money-maker Claude Monet, and set a world record for the Polish artist Tamara de Lempicka

Futurist bronze sculpture cast from another bronze in the 1970s sells for $16.2m—four times its estimate

In our new video series, deputy art market editor Margaret Carrigan recaps the highlights of New York's billion-dollar auction week

Our pick of highlights from this week's auctions around the world

How a work of art comes to auction is far from a simple process and its place in the eventual sale order is crucial

Can the quality of the smaller works coming up during "gigaweek" quell economic jitters?

One of the works was looted by the Nazis from Jewish collector Jacques Goudstikker, but is now being sold by his heir after restitution

High price for painting at Christie’s in New York last week is prompting speculation but expert says his money is on Isaac de Jouderville

Stunt suspicions swirl after Sotheby’s auction sees 2009 work by street artist sell for far more than its £2m high estimate

The database includes 9,000 catalogues from more than 390 auction houses in Germany, Austria and Switzerland

Jose Mugrabi and Antoine Arnault among collectors bidding at "white glove" sale of works by François-Xavier and Claude Lalanne

A different version of the sculpture Unique Forms of Continuity in Space sold at the auction house in 1975 for $41,000

A leading Italian art historian attributed it to Raphael and associates before the sale

Nicole Eisenman, Jean-Michel Basquiat and a dozen Italians help weather the Brexit storm

New record set for Alex Katz, but less-familiar names also exceed expectations

Christie's sale in London totals £23m with Modern British artists rubbing shoulders with international post-war names

Art is pitched as an asset class, but even big-name artists are not guaranteed to hold their value, let alone turn a profit

Burgeoning private museums offer cause for hope among economic uncertainty and geopolitical turbulence

Although one Mayan relief was withdrawn, the Mexican government condemned the "illegal" sale but auctioneer Millon defends it as "perfectly legitimate"

Our pick of highlights from upcoming auctions and fairs

Sweeping demonstrations are putting people off buying art, but relations with the US are likely to have a greater long-term effect

We revisit interviews about the headline-making auction of the famous painting, its origins and its present whereabouts