| Client name | City | Country |
|---|---|---|
| SMART INTERNATIONAL COMPANY FZE. | Dubai | United Arab Emirates |
| SMB Gesellschaft für | Nidda | Germany |
| SMS Siemag AG | Hilchenbach-Dahlbruch | Germany |
| SOCAR-Foster Wheeler Engineering LLC | Baku | |
| Softwarebüro Kersting | Dormagen | Germany |
| Soluciones integrales de Gestión S.A. | CABA | Argentina |
| Solvay Chemical GmbH | Bernburg | Germany |
| Solvay Chemicals GmbH | Rheinberg | Germany |
| Solvay Chlorovinyls GmbH | Rheinberg | Germany |
| Solvay GmbH | Bad Wimpfen a. N. | Germany |
| Solvay Infra Bad Hönningen GmbH | Bad Hönningen | Germany |
| SOLVAY S.A. | Bruxelles | Belgium |
| SOLVAY SA | Brüssel | Belgium |
| SOMAS Instrument AB | Säffle | Sweden |
| Sonatrach Raffineria Italiana S.r.l. con socio unico | Augusta | Italy |
| SPIE Controlec Engineering B.V. | Schiedam | Netherlands |
| SPIE Nederland B.V. | Breda | Netherlands |
| Spirax Sarco S.r.l. | Nova Milanese | Italy |
| Spraytech India | Thane | India |
| SRF Limited | DAHEJ | India |
| SRI Petrochemical Equipment Installation Co.Ltd. | Pudong, Shanghai | China |
| SRM University | Kattankulathur | India |
| Stadler + Schaaf Mess- und Regeltechnik GmbH | Hamburg | Germany |
| Städtische Werke Energie+Wärme GmbH | Kassel | Germany |
| Stahlwerk Thüringen GmbH | Unterwellenborn | Germany |