| Client name | City | Country |
|---|---|---|
| KP Engineering | München | Germany |
| Kraftanlagen Energies & Services SE | München | Germany |
| Kraftwerks AG | Mannheim | Germany |
| Kramer & Best Anlagenbau GmbH | Dörth | Germany |
| Kriko Engineering GmbH | Stegen | Germany |
| KROHNE (M) Sdn Bhd | Petaling Jaya, Kuala Lumpur | Malaysia |
| KROHNE Messtechnik GmbH | Duisburg | Germany |
| KROHNE Pressure Solutions GmbH | Minden | Germany |
| KSB SE & Co. KGaA | Frankenthal | Germany |
| KT - Kinetics Technology SpA | Rome | Italy |
| KTY Engenharia Ltda. | Sao Paulo | Brazil |
| KÜHME Armaturen GmbH | Bochum | Germany |
| Kuwait Integrated Petroleum Industries Company | Ahmadi | Kuwait |
| Kuwait Petroleum Corporation (KPC) | Safat | Kuwait |
| L&T ENERGY HYDROCARBON ENGINEERING LIMITED | Vadodara | India |
| L&T Technology Services Limited | Chennai | India |
| LACC, LLC | Westlake | United States |
| Landesamt für Umweltschutz | Halle/Saale | Germany |
| Lang und Peitler Automation GmbH | Wesseling | Germany |
| Lanxess Belgium NV | Kallo (Beveren) | Belgium |
| Lanxess Buna GmbH | Marl | Germany |
| Lanxess Chemical B.V. | Rotterdam-Botlek | Netherlands |
| LANXESS Deutschland GmbH | Köln | Germany |
| LANXESS Deutschland GmbH | Krefeld | Germany |
| LANXESS Performance Materials NV | Antwerpen | Belgium |