| 2018 | 175 Years celebrations of Simpson |
| 2016 | Successful foray into Italy and Turkey global markets |
| 2014 | Achieved all time record sale of 180,000 engines |
| 2013 | Launch of new Training Centre at Sembium, Chennai |
| 2012 | Commissioning of new Emission Lab at Sembium Plant, Chennai |
| Started making new generation SJV series and compact SC213 engines | |
| 2007 | License granted to make 120,000 engines, annually |
| 2005 | Launch of the fully air-conditioned “J” Hook assembly line at Sembium Plant |
| “J” Centenary celebrations | |
| 2001 | Started making new generation SJ series engines with technical support from AVL, Austria |
| 1999 | Launch of Oracle-based ERP, Full-fledged Research & Development centre established at Sembium Plant, Chennai. |
| 1997 | Surpassed annual production of 50,000 engines |
| 1995 | Commenced making engines at Kumbakonam Plant with an annual capacity of 24,000 in nos. |
| 1993 | Exceeded annual target of 30,000 engines |
| 1992 | Introduced S325 & S433 engines for Genset and Marine applications |
| 1991 | First overseas bulk order for 2,000 nos. S325 engine received from Industrija Masina I Traktora (IMT), Belgarde, Yugoslavia. |