Okasan Securities Group, Inc. engages in financial instruments business. It operates through the following business segments: Securities, Asset Management, and Support Service. The Securities segment covers trading, brokerage, underwriting, and distribution of securities, public offering and secondary distribution of securities. The Asset Management segment offers investment management and investment advisory. The Support Service segment includes information processing services, administrative support services, custodianship, and temping services. The company was founded by Seiji Kato on April 4, 1923 and is headquartered in Tokyo, Japan.