The story
Corman established his own company, Palo Alto Productions, in 1954, which was responsible for his first two movies. Filmgroup came out of a desire for Corman to move into distribution.
In February 1959, Filmgroup announced they would release ten films. Their first movies were High School Big Shot (1959) and T-Bird Gang (1959) produced by Stanley Bickman. Corman would also buy films made by independent distributors, in addition to several films from the Soviet Union, which he would re-dub and have additional scenes shot and added to.
Gene Corman left the company in 1963 to join 20th Century-Fox and Corman handed over distribution of his films to American International Pictures. The company soon wound up.
Because Roger Corman often neglected to copyright his movies, most of these films are in the public domain.
From Wikipedia’s article on The Filmgroup, shared under CC BY-SA 4.0.4