With his assets of the Alpha Trading Company and capital of a semi-retired officer, Andrew Heron, Cooper established Heron Films Ltd., a company which set out to produce longer films, comedies and dramas, with the theatrical company of Mark Melford, a well-known actor in those days. Cooper also established Kinema Industries Ltd, for which he made several documentaries and newsreels, among which the notorious "The Suffragette Derby" of 1913 at Epsom, in which suffragette Emily Davison can be seen being trampled to death by the King's racing horse. It was filmed by Cooper with his camera at the finish and his brother Hubert at Tattenham Corner.