| Client name | City | Country |
|---|---|---|
| EMP Planungsgesellschaft | Leverkusen | Germany |
| EMR-Technik Bohne GmbH | Marl | Germany |
| EMS Chemie AG | Domat / Ems | Switzerland |
| EnBW | Stuttgart | Germany |
| EnBW Kraftwerke AG | Stuttgart | Germany |
| Enco Engineering GmbH | Chur | Switzerland |
| ENCOS GmbH & Co. KG. | Hamburg | Germany |
| Endress + Hauser Ltd | Manchester | United Kingdom |
| Endress+Hauser AS | Tranby | Norway |
| Endress+Hauser Inc. | Greenwood | United States |
| Endress+Hauser SE+Co. KG | Maulburg | Germany |
| Endress+Hauser SICK GmbH+Co. KG | Ottendorf-Okrilla | Germany |
| Enel Servizio S.p.A. | Venedig | Italy |
| ENERECO S.p.A. | Fano | Italy |
| Energie AG Oberösterreich Business Services GmbH | Linz | Austria |
| Energie Consult Holland B.V. | EDE | Netherlands |
| Energie-Einspar-Technik | Hannover | Germany |
| Energiewerke Nord GmbH | Lubmin | Germany |
| Energy Automation Systems GmbH | Wien | Austria |
| Energy Industries Engineering & Design | Tehran | |
| Enerkem Inc. | Montreal | Canada |
| ENERTRAG HyTec GmbH | Dauerthal | Germany |
| Engel Software Engineering | Hanau | Germany |
| Engineered Software, Inc. | Lacey | United States |
| Engineering Technical Services S.p.A. | Cameri | Italy |