Proto Corp. engages in the provision of automobile and lifestyle-related information through magazines, Internet, mobile, and other media. It operates through the following segments: Platform, Commerce, and Others. The Platform segment offers information on new cars, used cars, parts, accessories, real estate information and other automobile-related concerns. The Commerce segment sells imported tires and wheels and used car export business. The Others segment deals with management of rental real estate and agricultural businesses. The company was founded by Hiroichi Yokoyama in October 1977 and is headquartered in Nagoya, Japan.