What movie won the most Oscars for acting?

In: Oscars

No movie won all four acting categories. 2 have won three Oscars for acting:

1976 Network won Best Actor (Peter Finch), Best Actress (Faye Dunaway) and Best Supporting Actress (Beatrice Straight)

1951 A Streetcar Named Desire won Best Actress (Vivien Leigh), Best Supporting Actor (Karl Malden) and Best Supporting Actress (Kim Hunter)

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