Conceptual videos by Teresa Margolles and the boys of the Beaux Arts Generation are among our picks of the best commercial exhibitions this month

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

Calls for emergency art storage are putting pressure on art shipment and insurance firms

Billed as the next big thing, schemes to sell shares in works of art have yet to excite the market

After more than a week of violent uprising in Santiago, the director of Chaco calls on art to “become the meeting space that Chile needs”

Inadvertent damage to paintings’ frames triggered a drawn-out, multi-million dollar lawsuit

Smith leaves after four and a half years with a $28.2m severance deal, including $16.9m in shares, and will remain as a senior adviser to Stewart

Timurid manuscript, estimated at £1m-£1.5m, from the late dealer's collection, failed to sell but many other pieces go over estimate

Rediscovered painting, found in a French house clearance, is the first work by the 13th century Florentine artist to be sold at auction in living memory

The decision comes after the company was accused of using “aggressive and coercive tactics” against staff when they attempted to unionise in September

Sales were stable at Asia's oldest contemporary art fair despite political tensions and the spectre of the US-China trade war

Introduced in March, the Counter Act is the latest legislation that faces dealers with financial regulatory burden

Matthew Green owes the firm around £3m, according to legal documents filed by the peer-to-peer lender

Busy auction series brought records for Osman Hamdi Bey and Jean-Léon Gérôme, and controversial sale of two illustrated folios separated from a Persian manuscript

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

Under new leadership, the longest-running fair dedicated to prints hopes to educate buyers on the pros and cons of the medium

Despite its commendable 'galleries-first' mindset, the scheduled fair's profit-sharing programme is not as revolutionary as it might seem

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

Christie's defends decision to sell two illuminations, expected to make up to £1m each, as they were removed from The Paths of Paradise 30 years ago

A sale of the artist duo's collection at Sotheby's Paris this week could further fuel market demand for Les Lalanne's playful works that fuse flora and fauna

The increasing professionalisation of the commercial art world yields new complexities for dealers

Ali Gureli apologises for accusing foreign media of spreading propaganda, but it is not yet clear if he will step down

The NBCUniversal vice chairman and co-founder of Creative Artists Agency claims two art dealers duped him into buying the fake painting for nearly $1m in 2001

Antiques trade fought for judicial review of proposed ban, due to come into force in the coming months, but draft judgement will not be made until 31 October

Galleries fresh to the 46th edition explain their decision and reveal their early sales

Street artist's Gross Domestic Product merchandise store opens online, but collectors are being heavily vetted to prevent flipping

A letter sent to the company's leadership yesterday outlines “aggressive and coercive tactics” used against employees after they attempted to unionise last month

Yayoi Kusama will display her largest ever public work for the French fair opening this week

The Spanish-born independent dealer discusses working with Larry Gagosian and why she won't do art fairs