Kodansha was founded by Seiji Noma in 1909, and members of his family continue as its owners either directly or through the Noma Cultural Foundation.
Seiji Noma founded Kodansha in 1909 as a spin-off of the Dai-Nippon Yūbenkai (Greater Japan Oratorical Society) and produced the literary magazine Yūben as its first publication. It uses the motto "omoshirokute, tame ni naru" ("To be interesting and beneficial").
Kodansha sponsors the prestigious Kodansha Manga Award, which has run since 1977 (and since 1960 under other names).
In October 2016, Kodansha acquired publisher Ichijinsha and turned the company into its wholly-owned subsidiary.
The Kodansha company holds ownership in various broadcasting companies in Japan. It also holds shares in Nippon Cultural Broadcasting, along with Kobunsha.
According to en.wikipedia.org