| 1953 |
Founded Ryosan Electric Co., Ltd. |
| 1957 |
Reorganized into a corporation and established Ryosan Electric Co., Ltd. |
| 1961 |
Established Ryoden Electric Co., Ltd. |
| 1963 |
Established Ryosan Trading Co., Ltd. |
| 1974 |
Established Hong Kong Ryosan Limited |
| 1976 |
Established Singapore Ryosan Private Limited |
| 1979 |
Established Ryotai Corporation |
| 1981 |
Changed company name to 'Ryosan Corporation' |
| 1983 |
Listed on the Tokyo Stock Exchange Second Section |
| 1985 |
Changed company name to 'Ryoyo Electronics Corporation' |
| 1986 |
Reclassified to the First Section of the Tokyo Stock Exchange and listed on the First Section |
| 1988 |
Absorbed and merged Ryosan Trading Co., Ltd. |
| 1989 |
Established Ryoyo Electronics Singapore Pte., Ltd. |
| 1991 |
Reclassified to the First Section of the Tokyo Stock Exchange |
| 1996 |
Established Ryosan Technologies USA Inc. and Ryoyo Electro Hong Kong Limited |
| 1997 |
Established Zhong Ling International Trading (Shanghai) Co., Ltd. and Ryoyo Electro USA, Inc. |
| 2001 |
Established Korea Ryosan Corporation |
| 2001 |
Established Korea Ryosan Corporation and Ryosan (Thailand) Co., Ltd. |
| 2002 |
Established Ryosan IPC (Malaysia) Sdn. Bhd. |
| 2002 |
Established Ryosan IPC (Malaysia) Sdn. Bhd. and Dalian F.T.Z Ryosan International Trading Co., Ltd. |
| 2003 |
Established Ryohyo Electronics (Shanghai) Co., Ltd. |
| 2004 |
Established Ryoyo Semiconductor Co., Ltd. |
| 2006 |
Established Ryosan Electronics (Thailand) Co., Ltd. |
| 2012 |
Established Ryosan Europe GmbH |
| 2014 |
Established Ryosan India Private Limited |
| 2016 |
Established Ryoyo Electro India Pvt. Ltd. |
| 2017 |
Fully acquired Edal Electronics Company Limited |
| 2017 |
Fully acquired Edal Electronics Company Limited, invested in IO Core Co., Ltd., and Qingdao Sanyuan Taike Electronic Technology Co., Ltd. |
| 2019 |
Established Ryoyo Electro Europe GmbH |
| 2019 |
Established Ryoyo Electro Europe GmbH and Ryoyo Electro (Malaysia) Sdn. Bhd. |
| 2020 |
Made Styles Co., Ltd. a consolidated subsidiary |
| 2022 |
Transitioned to the Prime Market of the Tokyo Stock Exchange |
| 2022 |
Transitioned to the Tokyo Stock Exchange Prime Market, invested in YAMASEI TECH CO., LTD., and Priken Co., Ltd. |
| 2023 |
Capital alliance with Ryoyo Electronics Corporation, making Ryosan a equity-method affiliate |
| 2023 |
Signed basic agreement to establish a joint venture with IAT Automobile Technology Co., Ltd. |
| 2023 |
Signed basic agreement on management integration |
| 2023 |
Signed final agreement on management integration through joint holding company establishment |
| 2023 |
Capital alliance with Ryoyo Electronics Corporation, making Ryosan a equity-method affiliate, signed basic agreement for joint venture with IAT Automobile Technology Co., Ltd., and management integration agreement |
| 2024-04-01 |
Ryosan Ryoyo Holdings Inc. established and listed on the Tokyo Stock Exchange Prime Market |
| 2026-04-01 |
Ryosan and Ryoyo Electronics merged to form Ryosan Ryoyo Corporation |
