| 1945: | Foundation of Ing. Grill & Grossmann as a steel construction company in Attnang-Puchheim |
| 1972: | Development of the non-insulated GIG facade system |
| 1980: | Development and focus on exports |
| 1996: | Restructuring of the company group and change of owners |
| 1998: | Foundation of sales office UK |
| 2003: | IFN Holding AG and Pohn Management GmbH take stakes in the company group |
| 2007: | Foundation of sales office USA |
| 2011: | Foundation of sales office Russia |
| 2013: | New owner structure of GIG HOLDING GmbH. IFN Holding AG as the new majority owner now holds a stake of two thirds, and Pohn Management GmbH holds a stake of one third in GIG. |