| 2023 | 100 percent takeover of Höfer & Bechtel GmbH |
| 2020 | 100 percent takeover of Eisenwerk Bassum GmbH |
| 2019 | Participation in the nuclear technology specialist Höfer & Bechtel GmbH |
| 2017 | August 1st: Interim Storage Activities transferred to the State in the course of the reorganisation of the responsibility for nuclear waste management in Germany |
| 2017 | January: Merger of the former GNS subsidiary Acta into GNS |
| 2014 | Loading of the 1.000th CASTOR® in Germany |
| 2011 | Relocation to the new headquarters |
| 2010 | Manufacturing of the 5.000th MOSAIK®-cask |
| 2009 | October: Acquisition of Acta as a wholly-owned subsidiary |
| 1995 | First CASTOR® put into storage at the interim storage facility Gorleben |
| 1992 | First CASTOR® put into storage at the interim storage facility Ahaus |
| 1985 | Commissioning of the plant at Duisburg |
| 1985 | Storage licence CASTOR® V/21 for USA |
| 1984 | First LLW put into the interim storage facility at Gorleben |
| 1983 | First CASTOR® loaded and stored at Paul-Scherrer-Institut in Switzerland |
| 1978 | Development of the first CASTOR®-cask and first drop tests |
| 1977 | Development of the first MOSAIK®-cask |
| 1977 | GNT is renamed to GNS Gesellschaft für Nuklear-Service mbH |
| 1974 | GNT Gesellschaft für Nukleartransporte was founded in Essen/Germany |