French expert Marc Restellini claims substantial modifications to Italian painter's 1915 portrait of Beatrice Hastings were not mentioned by Christie's when the picture was sold—twice

From Danh Vo in London to Linda Stark in Los Angeles

Complex, housed in five townhouses in South Kensington, was due to open in May but the launch was delayed due to the coronavirus lockdown

Institute is claiming copyright ownership and right to publish expert’s research, alongside share of profits from Institut Restellini which it claims charges €30,000 per inquiry

Charlotte van Leerdam will take on additional role as organiser of Maastricht and New York events as Sofie Scheerlinck steps down and chief executive is not replaced

Switzerland's Federal Criminal Court ordered documents unsealed that call into question whether the dealer declared all profits from sales made to Dimitry Rybolovlev

Value of private sales at auction house remain around the same as last year at $575m but number of online auctions more than doubles

Gallery has had a premises in city since 2009 but will open bigger space this September with exhibition of Brice Marden's work

Plus, the artist Hassan Hajjaj on a Dr Alimantado album cover

Smaller fair and online collaboration with Christie's planned as UK government says trade fairs can resume from 1 October

Six works were withdrawn by nervy vendors just before the start but Rembrandt to Richter sale still totalled nearly £150m, topped by a £22.3m Joan Miró

A spate of activity is helping galleries move forward during the pandemic

The four-hour event was intended to illustrate the auction house's global and democratic nature, but it also showed that less is often more

Media and entertainment investment firm Lupa Systems will become the events company's anchor shareholder, holding around a third of shares if approved on 3 August

Manuscript sold at Christie's first live sale in London since the coronavirus lockdown, but academics say its ownership history should be more transparent

Highlights from the online version of the “pre-contemporary art” event for galleries and auction houses which launches today and runs until 10 July

Media and television mogul is reportedly in negotiations to take a stake in art fair's Swiss parent company MCH Group

New co-operative grew out of a WhatsApp group set up in March for galleries to share advice in the wake of UK’s coronavirus lockdown

Galleries no longer required to have a physical space, down payments cut from 100% to 25% of stand fees and automatic re-admittance for 2020 ABHK exhibitors

The fair group sent a letter to exhibitors guaranteeing full refunds if its autumn events are also forced to cancel due to virus concerns

Art dealer takes the reins of the fair's executive committee, while four women join the board of trustees

The art dealer is opening a third space in Brussels today with an exhibition of new works by Sterling Ruby

From Michael Wolf's lush images of Hong Kong to the minimalist works of Alice Tippit in Chicago

London and Miami-based Philbrick, on the run since October, was arrested by FBI on Vanuatu on Thursday

As part of a growing trend, Sotheby's is launching The Dealer's Eye, two sales of works consigned by nearly 40 Old Master galleries in London and New York

Airline has called in Sotheby's to value and sell at least ten pieces from its collection, which includes works by Damien Hirst, Bridget Riley and Peter Doig

David Zwirner, White Cube, Pace, Gagosian among galleries opening their doors next week—but don’t forget your face mask

Flagship fair will relaunch next June in Basel as organisers focus on delivering Miami Beach show in December

Claimants including major museums and art galleries accuse companies of failing to pay out on Covid-19 pandemic

In frank letter, organisers scrap Monday deadline for exhibitors as Swiss authorities delay decision on large-scale events until 24 June