- D-Trust (certificates)*
- Fraunhofer SIT (IT security training for T.I.S.P.)
- G DATA CyberDefense (virus protection)*
- Hornetsecurity (cloud and mail technology)*
- Institut für Internet-Sicherheit - if(is) (IT security consultancy)*
- isits (IT security training for T.I.S.P.)*
- M&H IT-Security (IT security training for T.I.S.P.)*
- Net at Work (PKI infrastructure)*
- NürnbergMesse (exhibition services)
- Secorvo (IT security training for T.I.S.P., T.P.S.S.E)*
- Siemens (communication technology)
- T-Systems (communication)
* "IT Security made in Germany"