1976	Com Stute, Inc., a U.S. corporation specializing in compilers, established Computer Institute of Japan, Ltd. (CIJ) in Yokohama as an independent company. Began developing Operating System for Hitachi, Ltd.
1982	Established Kansai Branch Office.
1991	Selected as a business partner of NTT DATA Corporation.
1992	Established Hokkaido Branch Office.
1995	Established Tokyo Office.
1998	Acknowledged as the Authorized Java Center by Oracle Corporation Japan. Contributed to promoting the appropriate use of Java. Established Chubu Branch Office.
1999	Established Kyushu Branch Office.
2000	Changed corporate name to the current CIJ. Acquired ISO 9001 certification.
2001	Listed on the Japan Securities Dealers Association over-the-counter market.
2002	Listed on the Second Section of the Tokyo Stock Exchange.
2004	Listed on the First Section of the Tokyo Stock Exchange. Acquired Privacy Mark.
2005	Made associated company Custanet Co., Ltd. a subsidiary. Acquired ISO 14001 certification.
2008	Acquired ISO 27001 certification.
2010	Merged subsidiaries Nihon Koken Systems Co., Ltd., CIJ Sophia Co., Ltd. and Nihon Advanced System Co., Ltd. to establish CIJ Next Co., Ltd.
2011	Merged Kanazawa Software Co., Ltd. into subsidiary CIJ Next Co., Ltd.
2013	Obtained a patent (Japanese patent No. 5406957) for its "SONOBA COMET" product. Contracted a bussiness alliance with the SYSCOM Group in Taiwan.
2015	Merged CIJ Managed System, Inc., CIJ BSC Co., Ltd. into subsidiary CIJ Next Co., Ltd.
2017	Merged CIJ Solutions, Ltd.
2019	Made Japan Financial Engineering, Ltd. a subsidiary.
2021	Obtained a patent (Japanese patent No. 6833966) for its "CREDIAL" product. Merged Business Soft Service Co., Ltd. Made a-LINK Corporation a subsidiary. Launched “Acceleration of growth to 50th ~ (Accel50)”, CIJ’s 6th medium-term business plan.
2022	Head office relocated to Yokohama Gate Tower. Listed on the Prime Market of the Tokyo Stock Exchange.
2023	Made i-BRIDGE Group (i-BRIDGE Co., Ltd., i-BRIDGE Systems Philippines Inc.) a subsidiary. Made Nissinsoftware Co., Ltd. a subsidiary.
2024	Launched “Become the strategic partner with IT (BEIT50)”, CIJ’s 7th medium-term business plan.