Primary contents from here.

Our businesses in support and other spheres deliver system infrastructures and provide administrative, property management, and other services, primarily for Group member companies.
System & Business
Okasan Business & Technology provides services on securities systems, as well as business process outsourcing in securities administration.
Other support
Okasan Kogyo handles property management and leasing, as well as employee welfare for all employees working under the Okasan Securities Group.
Okasan Securities Group Companies (Other Subsidiaries)
The corporate profiles of Okasan Securities Group companies, other than securities subsidiaries, are available here: