| 1900 | Oil Well Supply Co. is founded in Oil City, PA |
| 1902 | Aetna Standard is founded in Ellwood City, PA |
| 1914 | Sutton Engineering is founded in Bellefonte, PA |
| 1954 | Concast AG, Gladwin Corporation, & Millcraft Products are founded |
| 1976 | SMS group legal entity is created in the United States |
| 1979 | Sutton Engineering is integrated into SMS group |
| 1998 | Aetna Standard is merged into SMS group |
| 2002 | Acutus Gladwin is acquired by SMS group and merged with Millcraft Products to form SMS Millcraft |
| 2007 | Formation of SMS Meer Service Inc |
| 2015 | SMS Millcraft & SMS Meer USA merge to form SMS Technical Services |
| 2018 | SMS Technical Services and SMS USA LLC merge to form SMS group Inc. |
| 2020 | SMS group Inc. and R.L. Best Company enter into a joint venture |
| 2021 | Paul Wurth Inc. is integrated into SMS group Inc. with the full acquisition of Paul Wurth into SMS group |
| 2023 | SMS Elotherm North America is integrated into SMS group Inc. |
| 2023 | SMS group Inc. fully acquires R.L. Best Company |