Marlborough

Time Out says

The Marlborough galleries of Barcelona and Madrid work in cahoots to coordinate and organise exhibitions of the artists they represent in other galleries and private and public institutions. The Marlborough family of galleries was founded in London in 1946 and won prestige in the 1950s for being the first gallery to show the German Expressionists in London. By 1958 Marlborough was representing such artists as Oskar Kokoschka, Henry Moore, Francis Bacon, Victor Pasmore and Lucian Freud.
In 1962 the New York gallery was opened, followed by Tokyo and Madrid. They also have spaces in Chile, Florida, Monaco, Chelsea and, of course, Barcelona, which was inaugurated in 2006.