Williams moved above Ferrari into third in the Formula 1 constructors' standings after Felipe Massa and Valtteri Bottas came third and fourth in the Italian Grand Prix at Monza.
The Grove-based drivers finished behind Lewis Hamilton and Nico Rosberg, who secured a one-two for Mercedes.
Hamilton's victory saw him close the gap to 22 points in the drivers' standings with six races remaining.
Pastor Maldonado was 14th in a Enstone-based Lotus with teammate Romain Grosjean 16th.
Kamui Kobayashi and Marcus Ericsson were 17th and 20th for the Leafield-based Caterham team.
Jules Bianchi finished 18th in a Banbury-based Marussia, while teammate Max Chilton retired after five laps.
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