| 1971/10/1 | Company establishment |
| 1981/5/1 | Reorganized under IKO Inc. |
| 1988/3/1 | Reorganized under IKO Co., Ltd. |
| 2000 | Introduction of Otsuka Corporation SMILEα |
| 2001 | Separation of Home-center division, entry into gift and novelty industry. |
| 2002 | http://www.iko-ltd.co.jp/ website start |
| 2003 | Introduction of optical fiber, improvement in network environment |
| 2004 | Introduction of OKI Laser Printer |
| 2005 | Increase in server capacity. Net shop mall exhibition for retail stores nationwide |
| 2006 | Reconstruction of customer management database server |
