Attorney general claims the auction house created and used tax exemption certificates that falsely presented the buyer as an art dealer in order to dodge payments. Sotheby's says it will continue to contest the case

The sale of the New York dealer, who died earlier this year and was once a vocal critic of auction houses, will feature works from the 14th to 20th centuries

Auction house will sell the 65 works, including $70m works by Rothko and Giacometti, in two standalone sales in November and next May

Our pick of the highlights from this month's fairs and auctions

Work went viral in 2018 when it shredded during the sale at Sotheby’s

Horowitz's new position will see him increasing Sotheby's collaboration with galleries and art dealers

The London-based dealer of four decades is downsizing and having a 200-lot sale of contemporary art, Modern furniture, ethnographic art and antiquities

The works, chosen by casino mogul Steve Wynn, will be auctioned as the entertainment group MGM Resorts moves to focus its art collection on "diversity and inclusion"

Proceeds from exhibition will go towards funding the monumental Paris project

The auction house's £17.2m offering in London tonight was only 57% sold, overshadowed by the football match

Asian bidders and British art boosted figures to make auction house's highest summer total since 2018

Seasonal two-storey space is newest addition to Monaco's growing commercial art scene

Our pick of the best objects up for sale in London and New York

Sotheby’s has postponed auction of extraordinary Honresfield Library as a consortium seeks £15 million to buy it

The opulent Palais Oppenheim in Cologne will host exhibitions and sales from September. Sotheby's says move is due to growing client base in country, not Brexit

The work, which took four months to paint in 2002, will be auctioned at Sotheby's this month

Berners-Lee says NFTs are the "ideal way to package the origins behind the web"

The cost-cutting French telecommunications billionaire has formed Altice UK to buy a 12.1% stake in the company

The unique coin from 1933, part of a collection amassed by luxury shoe designer, Stuart Weitzman, sold at Sotheby's in New York yesterday

Institution says the work is being lent by the foundation that swooped in to rescue it when it was deaccessioned by the Newark Museum of Art

A museum sells art to balance its budget, a gorgeous Sargent goes unwanted, and a painting of a giraffe reaches high.

Plus, Heather Phillipson at Tate Britain and Ackroyd and Harvey on Joseph Beuys

Christie's and Sotheby's are starting to embrace what the social media platform has to offer

The evening of sales in New York totalled $439.6m, with Basquiat's Versus Medici topping the contemporary art offering at $50.8m and a new record for Leonor Fini

Sotheby's auction of the Texan rancher's collection totalled $157.2m and set new records for Kenneth Noland, Larry Rivers and Richard Diebenkorn

But the show goes on at Sotheby’s and Christie’s with a mixture of in-person and remote bidding, while British dealers are getting creative in the Big Apple

The sale this month will be the first time the auction house has accepted cryptocurrency as payment for a physical work of art

The collection of 18th-century porcelain was previously exhibited in Dutch museums

Online sale will span the 17th to the 21st centuries featuring artists including Dorothea Tanning, Hannah Höch and Barbara Hepworth