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| 1956 (May) | Founded Oriental Terminal Products Co., Ltd. (OTP) - Started Automotive and Consumer business for Terminals and Connectors - |
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| 1970 (July) | Founded Matsumoto Molding and Engineering Co., Ltd. - Company before Yuko Sendai Factory, started manufaturing of Plastic lends-barrel for Single lends reflex camera - |
| 1972 (January) | Established OTP |
| 1976 (January) | Founded Yuko Co., Ltd. - Started Power supply parts and Consumer business as "Wall plugs blades" - |
| 1977 (January) | OTP Yokohama Factory start operation |
| 1987 (November, 1) | OTP becomes group company of Sumitomo Metal Mining Co., Ltd. |
| 1988 (June) | Established SKG Co., Ltd. - Yuko Co., Ltd. took over Matsumoto Molding and Engineering Co., Ltd. business - |
| 1990 (March) | Founded Sumix Co., Ltd. - Started information recording business as " FFC/FPC Connectors for Optical Pick up " - |
| 1990 (June) | Sumix Co., Ltd. becomes group company of Sumitomo Metal Mining Co., Ltd. |
| 1992 (September) | Yuko Co., Ltd. Noshiro factory start operation |
| 1994 (October) | Merger 3 companies (OTP, YUKO, Sumix) and establsihed SUMIKO TEC CO., LTD. - Capital : 410 million yen - |
| 2003 (January) | Capital increased to 490 million yen |
| 2005 (December) | ISO 14001 (2004 Edition) certified at entire domestic site |
| 2010 (July) | ISO 9001 (2008 Edition) certified at entire domestic site |
| 2016 (August) | Establish SUMIKO TEC (DONGGUAN) CO., LTD. - Group Company at Dongguan City, Guangdong Province - |
| 2017 (February) | Headquarter functions relocate to Shin-Yokohama |
| 2018 (January) | Establish SUMIKO TEC (THAILAND) CO., LTD. - Group Company at Bangkok, Thailand - |
| 2018 (July) | ISO 9001/14001 (2015 Edition) certified at entire domestic site |
| 2020 (February) | IATF16949 certified at Noshiro Factory |
| 2022 (March) | IATF16949 certified at Sendai Factory |
| 2022 (November) | Established Minebea Connect Inc. |
| 2023 (April) | Head office relocated to Tama City, Tokyo |