According to the Art Loss website, that would be Pablo Picasso. Currently there are 1,147 of his paintings registered as stolen, missing or disputed. Next is American artist Nick Lawrence who has 557 stolen works, third place goes to Marc Chagall, with 516 stolen works ….and so on…. Karel Appel (505), Salvador Dali (505), Loan Miro (478), David Levine (343), Andy Warhol (343), Rembrandt(337) and Peter Reinicke (336). Sheez, keep an eye open at Trash and Treasure!!!
Psst Oh and 40% of these thefts occured in Britain.