| Client name | City | Country |
|---|---|---|
| John Zink GmbH | Frankfurt | Germany |
| Johnson Matthey Chemicals GmbH | Emmerich | Germany |
| Juette Engineering | Kempen | Germany |
| Junkalor GmbH | Dessau | Germany |
| KAB TAKUMA GmbH | Berlin | Germany |
| Kali-Chemie AG | Nienburg | Germany |
| KBN Engineering GmbH | Marl | Germany |
| KERN Technology GmbH & Co. KG | Eisenberg | Germany |
| Kernkraftwerk Brunsbüttel GmbH & Co. oHG | Brunsbüttel | Germany |
| Keynes Planungsgesellschaft mbH | Neuss | Germany |
| Keystone GmbH | Mönchengladbach | Germany |
| KG transmitter components GmbH | Bad Oeynhausen | Germany |
| KI plan GmbH | Pinneberg | Germany |
| Kiel Engineering GmbH | Gelsenkirchen | Germany |
| Kiel Enginieering GmbH | Wesseling | Germany |
| Klaus Fischer GmbH & Co. KG | Bad Salzuflen | Germany |
| KLAUS UNION GmbH & Co. KG | Bochum | Germany |
| KLAUS-J. THUM VDI | Parey-Elbe | Germany |
| KLK EMMERICH GmbH | Emmerich | Germany |
| Koller + Luding | Amberg | Germany |
| Kommanditgesellschaft Deutsche Gasrußwerke GmbH & Co | Dortmund | Germany |
| König GmbH | Starnberg | Germany |
| KORAMIS GmbH | St. Ingbert | Germany |
| KP Engineering | München | Germany |
| Kraftanlagen Energies & Services SE | München | Germany |
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