Modernist works from the Georgia O’Keeffe Museum will be offered in New York in November

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

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

The mega-collector’s latest lawsuit, filed in New York, escalates his three-year legal feud with Swiss dealer Yves Bouvier

Franck Davidovici first accused the artist of plagiarising his 1985 advertising campaign almost four years ago

Just two paintings significantly damaged the auction house's bottom line in the second quarter

Rockefeller auction plus leap in private and online sales drive 26% increase

Sotheby's sale fell below estimate while Christie’s provided some cheer, showing there is still money in Monet – but only the right one

New record for Joan Mitchell as fresh artists join the $10m-and-up club—but Bacon and Basquiat still dominate top prices in New York

Leaning on romance of Rockefeller name and its appeal to international and first-time buyers, the auction house triumphed in its marathon week of sales

Subcontinent’s art scene expands with the help of private money as government cleans up the economy and simplifies tax

Order could pave way for Russian billionaire to launch High Court case against Swiss dealer Yves Bouvier and Sotheby’s

Despite buy-ins, the sale saw several strong prices and records below the dizzy height of $450.3m for Leonardo da Vinci's Salvator Mundi

Painting is being presented by Christie’s as the “Holy Grail of Old Master paintings”

Salvator Mundi will break Old Master auction record as seller dispute rumbles on

French shipping firm André Chenue beat US competitors to buy the 150-year-old business, as Bouvier continues to fight legal case against Dimitry Rybolovlev

The painting, presumed lost until 2005, is estimated at $100m

Thousands of items, including Einstein's calculations and de Sade's writings, will return to market

MCH Group took a majority stake in the fair and now plans a digital overhaul

President Tad Smith reveals that the auction house expects to lose between $10m to $19m in the fourth quarter due to sale guarantees for the former owner’s art

The veteran dealer Richard Feigen on the state of the art market in 2007