Kosei Securities Co., Ltd. provides investment and financial services in Japan. It engages in the buying and selling of securities, securities index futures, securities options, and foreign market securities futures, as well as the underwriting and offering of securities and solicitation of sales to specified investors. The company also provides intermediation, brokerage, and agency services for the buying and selling of securities and for the entrustment of such transactions. Incorporated in 1961, it is headquartered in Osaka, Japan.