DeNA Co., Ltd. engages in the development and operation of mobile and online services including games, e-commerce and entertainment content distribution. It operates through the following segments: Social Media, Electronic Commerce (EC) and Others. The Social Media segment offers social media-related services within Japan and overseas. The Electronic Commerce (EC) segment engages in online auctions, shopping services, online payment, and purchasing solutions within Japan. The Others segment includes promotions of Japanese professional baseball team on Yokohama DeNA Baystars Baseball Club, Inc; and healthcare business. The company was founded by Tomoko Namba on March 4, 1999 and is headquartered in Tokyo, Japan.