| 1967 | Started export and import business |
| Opened Bangkok Representative Office in Thailand | |
| 1976 | Opened Jakarta Representative Office in Indonesia
 70s’ in Indonesia |
| 1983 | Relocated headquarters to current location of Tennoji-Ku, Osaka |
| 1989 | Established joint venture INTERNATIONAL IRONWORKSCO.,LTD. In Thailand
 INTERNATIONAL IRONWORKSCO.,LTD. In Thailand |
| Started manufacture of cast iron and cast steel products. | |
| 1993 | Opened Ho Chi Minh City Representative Office in Vietnam
 90s’ in Vietnam |
| 1994 | Invested in joint venture BURAPA STEEL CO.,LTD. In Thailand.
 BURAPA STEEL CO.,LTD. In Thailand. |
| Opened Hanoi Representative Office in Vietnam | |
| 2003 | Opened Mumbai Liaison Office in India |
| Opened Phnom Penh Representative Office in Cambodia | |
| 2004 | Established joint venture PT.AZ TECS INDONESIA in Indonesia
 PT.AZ TECS INDONESIA in Indonesia |
| 2009 | Established joint venture MAKITA VIETNAM CO., LTD. in Vietnam |
| 2012 | Established THAI SENG TRADING (THAILAND) CO., LTD. In Thailand |
| Established THAI SENG VIETNAM CO., LTD. in Vietnam | |
| 2013 | Established Delhi Liaison Office in India |
| 2014 | Opened new office and distribution center of THAI SENG TRADING (THAILAND) CO., LTD. |
| 2015 | Opened Chiang Mai Branch of THAI SENG TRADING (THAILAND) CO., LTD.
 Opened Chiang Mai Branch |
| 2016 | Established joint venture PT. EVER CHEMICAL INDONESIA in Indonesia |
| 2017 | Opened Yangon showroom in Myanmar |
| 2018 | Opened Rayong Branch of THAI SENG TRADING (THAILAND) CO., LTD.
 Rayong Branch in Thailand |
| Relocated Mumbai Liaison Office to Pune | |
| 2019 | Opened Hat Yai Branch of THAI SENG TRADING (THAILAND) CO., LTD.
 Hat Yan Branch in Thailand |
Established THAI SENG INTERNATIONAL (THAILAND) CO., LTD. In Thailand
 Thai Seng International (Thailand) Co.,Ltd |
|
| 2022 | Closed THAI SENG TRADING (THAILAND) CO., LTD. because of Transferring duties to THAI SENG INTERNATIONAL (THAILAND) CO., LTD. in Thailand |
Opened Sriracha Branch of THAI SENG INTERNATIONAL (THAILAND) CO., LTD.
 Sriracha Branch in Thailand |
|
| 2023 | Established PT THAI SENG INDONESIA In Indonesia |
Opened Phuket Branch of THAI SENG INTERNATIONAL (THAILAND) CO., LTD.
 Phuket Branch in Thailand
|
|
| 2024 | Established THAI SENG (CAMBODIA) CO.,LTD. |