Koseishouken (光世証券) is an Osaka-based independent securities firm engaged in investment and financial services, including brokerage (equity and derivatives), securities underwriting, and private placement services for both retail and institutional clients. The company offers self-proprietary trading as well as client-facing execution services across Japanese equities, bonds, investment trusts, and exchange-traded derivatives including Osaka Exchange futures and options via internet trading. The firm also operates a cloud-based securities core system provision service for other industry participants, representing a differentiated technology capability.