| Year | Detail |
| 1958 |
Rohm was incorporated as Toyo Electronics Industry Corp. by Kenichiro Sato. |
| 2011 |
ROHM SEMICONDUCTOR INDIA PVT. LTD. was incorporated and is classified as a foreign company subsidiary and registered at RoC-Bangalore. |
| 2013 |
The company started mass production of the RASMID series, which was comprised of the most minor parts, utilizing an entirely new manufacturing method. |
| 2014 |
The company developed high-power ultra-low-ohmic shunt resistors optimized for current detection in automotive and industrial applications. |
| 2015 |
Rohm Co. Ltd. acquired a part of Renesas Shiga factory (8-inch line) from Renesas Semiconductor Manufacturing Co. Ltd. This part will be utilized to manufacture mainly IGBTs, MOSFETs, and piezoelectric MEMS devices. |
| 2019 |
ROHM acquired a part of the diode and transistor business from Panasonic Semiconductor Solutions Co., a group company of Panasonic Corp. |
| 2022 |
ROHM entered into an agreement with Shiga Prefecture to 'connect people and forests', stipulating two parties to work together and cooperate toward achieving a sustainable society utilizing Shiga Prefectural Omifuji Karyoku Park (Yasu, Shiga Prefecture) as a practical model. |
| 2022 |
ROHM signed an agreement with Kyoto City to build a decarbonized society. This agreement provides greater cooperation between the two parties on decarbonization, biodiversity, and improved local resilience. |
| 2022 |
This agreement provides for greater cooperation between the two parties on decarbonization, biodiversity, and improving local resilience and marks the first time Kyoto has partnered with a company. |