| 1954 | May | Established Onishi Seisakusho in Yaguchi-machi, Ota-ku, Tokyo (Founder: Yukio Onishi). |
| 1956 | November | Relocated to newly-built plant in Shimomaruko, Ota-ku, Tokyo. Reformed the organization and changed name to Onishi Seiki Kogyo (Capital: \500,000). |
| 1957 | June | Developed technology to produce bellows-type thermostats. |
| 1961 | February | Built and relocated to comprehensive plant in Kiyose-shi, Tokyo in line with rapid growth in the automobile industry. |
| 1967 | March | Developed pressure-resistant wax-type thermostats to replace bellows-type thermostats to improve cooling performance in engines. |
| 1968 | May | Constructed new main plant. |
| 1972 | January April |
Remodeled main corporate building.
Changed company name to Nippon Thermostat Co., Ltd. |
| 1973 | June | Constructed Kiyose Plant in Kiyose, Tokyo. |
| 1977 | November | Constructed Yorii Plant in Yorii-machi, Osato-gun, Saitama. |
| 1978 | March | Separated Yorii Plant and established it as NTC Industry Co., Ltd. Extended buisiness into housing and electical appliances fields. |
| 1981 | December | Constructed new main plant and established technology research institute. |
| 1986 | November | Constructed north plant beside main plant. |
| 1989 | May | Constructed Shioya Plant in Shioya-machi, Shioya-gun, Tochigi. |
| 1994 | August | Inaugurated a joint venture, Nippon Thermostat (India) Limited, in India. |
| 1999 | August | Obtained ISO 9001 certification. |
| 2002 | July | Inaugurated an overseas affiliate, Nippon Thermostat of America Corporation, in West Virginia, U.S. |
| 2003 | May | Obtained ISO-14001 certification. |
| 2004 | June | Merged the back-office section of NTC Industry Co., Ltd. |
| 2005 | June | Constructed Nippon Thermostat of America Corporaton, North America Plant. |
| 2008 | February | Inaugurated Shiojiri Plant (resin molding plant) in Shiojiri, Nagano. |
| 2009 | May | Made NTC Industry Co., Ltd. a wholly-owned subsidiary. |
| 2009 | October | Inaugurated Shioya Second Plant in Shioya-machi, Shioya-gun, Tochigi. |
| 2013 | August | Inaugurated an overseas affiliate, Nippon Thermostat Vietnam Co., Ltd., in Vietnam. |
| 2018 | April | Merged NTC Industry Co., Ltd. |
| 2019 | February | Constructed New Head Office building in Kiyose-shi, Tokyo. |
| 2019 | May | Constructed Yorii Second Plant in Yorii-mach, Osato-gun, Saitama |
| 2024 | May | Constructed Technical Center in Kiyose-shi, Tokyo. |
