In practice, 20th Century Fox ceased to exist as an independent entity when its board of directors voted in favor of a merger with Disney.
For the records, in 90 years of Oscar history, Fox has won 13 Best Pictures (about 14 percent).
The following Oscar-winning films were made and/or released by Fox and/or Fox Searchlight:
1933: Cavalcade
1944: How Green Was My Valley
1947: Gentleman’s Agreement
1950: All About Eve (record of 14 nominations)
1965: The Sound of Music
1970: Patton
1971: The French Connection
1995: Braveheart (international)
1997: Titanic (international) (14 nominations)
2008: Slumdog Millionaire (Fox Searchlight, FS)
2013: 12 Years a Slave (FS)
2014: Birdman (FS)
2017: The Shape of Water (FS)