| 1963 | Foundation of the company by Dr. Friedhelm Klocke |
| 1971 | Acquisition of the company through Hartmut Klocke |
| 1977 | The company Hartmut Klocke Abfüllungs- und Verpackungs-Service gets permission to pack drug products |
| 1984 | Foundation of Klocke Verpackungs-Service GmbH in Weingarten/Baden and of Klocke Verwaltungs GmbH |
| 1990 | Sales Office Klocke France Eurl |
| 1992 | Foundation of Klocke-Pharma-Service GmbH in Appenweier/Baden |
| 1993 | Acquisition of the Impfstoffwerk Dessau-Tornau (IDT Biologika GmbH) |
| 1994 | Acquisition of Pharmapack Stade GmbH |
| 1998 | Formation of Klocke of America, Inc. |
| 2007 | Formation of the Klocke Holding |
| 2010 | Centralisation of the pharmaceutical-packaging site and the non-pharma-site at Klocke Verpackungs-Service GmbH, Weingarten |
| 2013 | In autumn 2013, IDT Biologika GmbH has taken over facilities, production and research of Riemser Pharma GmbH in Greifswald - district Riems. Since then, IDT Biologika (Riems) has been developed to a production facility for veterinary vaccines, including process development and quality control. |
| 2015 | IDT Biologika GmbH acquires the CMO business from Aeras TB in Rockville, Maryland, USA |
| 2015 | Acquisition of Gallant Custom Laboratories Inc. in Canada |
| 2017 | Acquisition of Ridgeway Biologicals Ltd. in Compton, UK |
| 2018 | Acquisition of Dr. Felgenträger & Co. - Ökochem. und Pharma GmbH in Dessau, Germany |
| 2018 | Divestment of Pharmapack Stade GmbH |
| 2019 | IDT Biologika divests its animal health business unit to Ceva Santé Animale and is set to focus on the production of human vaccines and medicines going forward. |
