| 1919 | Small manufacturing business founded by Robert Hugo Stiehl |
1919–1945
| Wood processing and manufacture of small-scale cardboard packaging |
1945–1960
| Wood processing and introduction of thermoset compression moulding |
| ab 1960 | Start of thermoplastics processing – now our main area of business |
| 1972 | Expropriation by GDR authorities |
| 1972–1990 | Part of the state-owned enterprise Plasta Crottendorf with several plants |
1. Juni 1990
| Re-privatised by Gotthold Heß and Jürgen Burkert. Hugo Stiehl GmbH founded with 70 employees |
| 1995 | New Plant 2 built in Crottendorf |
| 1997 | DIN ISO 9001 certification |
| 2000 | Construction of new central warehouse |
| 2001 | Construction of new toolmaking workshop |
| 2003 | Construction of new Plant 1 at headquarters in Crottendorf |
| 2003 | Purchase of Plant 3 building complex |
| 2008 | ISO/TS 16949 certification |
| 2011–2013 | Extensive refurbishment of administrative building; waste heat used to heat factory buildings |
| 2012 | DIN EN ISO 50001 certification |
| 2015 | Warehouse extension at Plant 2 |