He moved to Arden International for the main 2009 GP2 Series season, driving alongside Edoardo Mortara. Pérez finished twelfth in the standings. His best finish was a second at Valencia. In the off-season, he raced in two rounds of the 2009–10 GP2 Asia Series season for Barwa Addax. He also raced in the 2010 GP2 season with Barwa Addax. He has won four races, and lies second in the standings with two races to go.