| 2012 | Change of ownership to the Dr. A. Knauf family / growth strategy focusing on commercial (re-)developments |
| 2006 | Change of ownership. Harpen Immobilien GmbH & Co. KG taken over by Goldman Sachs and Cerberus |
| 2000 | Transfer to RWE AG |
| 1992 | VEW AG becomes majority shareholder |
| 1969 | Transfer of the mining activities to the Ruhrkohle AG; continuation of real estate and shared activities |
| 1856 | Founding of "Harpener Bergbau Actiengesellschaft" and introduction of the Harpen share at Berlin stock exchange; more than 43,000 employees |
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