| Client name | City | Country |
|---|---|---|
| Engineers India Limited | Gurugram | India |
| Engineers India Limited | New Delhi | India |
| ENI S.p.A. | San Donato Milanese | Italy |
| EniProgetti SpA | Basingstoke | United Kingdom |
| Enovas | Darmstadt | Germany |
| Enppi Engineering for the Petroleum & Process Industries | Cairo | Egypt |
| ENPRODE Engineering & Consulting | Yenibosna-Istanbul | Turkey |
| ENTRACON Planungsgesellschaft mbH | Hamm | Germany |
| EPC Engenharia Projeto Consultoria S/A | Estoril Belo Horizonte | Brazil |
| EPC Handelsgesellschaft m.b.H | Wiener Neudorf | Austria |
| EPICON IEaC GmbH | Bad Vöslau | Austria |
| EQUANS | Zwijndrecht | Belgium |
| Equans SA | Zwijndrecht | Belgium |
| Equistar Chemicals, LP | La Porte | United States |
| Erdgas Verkaufs GmbH | Münster | Germany |
| ESB Electricity Supply Board | Dublin 2 | Ireland |
| Esco GmbH & Co KG | Rheinberg | Germany |
| ESFEROMATIC S. A. | Quilmes | Argentina |
| ESIM Chemicals GmbH | Linz | Austria |
| Essity Operations Mannheim GmbH | Mannheim | Germany |
| Esso Deutschland GmbH | Hamburg | Germany |
| ETABO Energietechnik und Anlagenservice GmbH | Bochum | Germany |
| Etteplan Germany GmbH | Leverkusen | Germany |
| EUREKA INDUSTRIAL EQUIPMENTS PVT. LTD. | Pune | India |
| EuroChem Antwerpen NV | Antwerpen | Belgium |
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