His 2012 film, "Something in the Air", was selected to compete for the Golden Lion at the 69th Venice International Film Festival. Assayas won the Osella for Best Screenplay at Venice. His 2014 film "Clouds of Sils Maria" was selected to compete for the Palme d'Or in the main competition section at the 2014 Cannes Film Festival. "Sils Maria" won the Louis Delluc Prize and garnered six César Award nominations including Best Film, Best Director, and Best Original Screenplay. The film won a César Award for Best Supporting Actress for American actress Kristen Stewart. In 2016, Assayas won Best Director Award (Cannes Film Festival) for "Personal Shopper", which also starred Kristen Stewart.