Premise: This is a list of feature films produced by the Fox Film Corporation, including those films produced by its corporate predecessor, the Box Office Attractions Company. Some of the later films in this list were produced by Fox Film, but were released and distributed by 20th Century Fox after the 1935 merger with Twentieth Century Pictures.
Hypothesis: the merger between fox film,  the Box Office Attractions Company and Twentieth Century Pictures took many years and was very expensive.