Sean Penn in 'One Battle After Another.' Warner Bros./Courtesy Everett Collection Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Sean Penn has won best supporting actor at the 2026 Oscars for One Battle After Another, putting him in esteemed company as just the fourth man ever to win three acting Oscars. The result feels relatively expected after months of unusual chaos in the category.