| Client name | City | Country |
|---|---|---|
| OMV Downstream GmbH | Schwechat | Austria |
| OMV Downstream GmbH | Wien | Austria |
| OMV Petrom S.A. | Bucharest | Romania |
| OMV Solutions GmbH | Wien | Austria |
| ONGC Petro additions Ltd. | Mumbai | India |
| OOO "Samson Controls" | Moskau | Russian Federation |
| OOO Uhde Industrial Solutions (RUS) | Dzerzhinsk | Russian Federation |
| Optitec Gesellschaft für ökonomische | Wiesbaden | Germany |
| OQ Services GmbH | Oberhausen | Germany |
| Ortner Ges.m.b.H. | Innsbruck | Austria |
| OSCHATZ GmbH | Essen | Germany |
| Österreichisches Forschungs- und Prüfzentrum | Wien | Austria |
| OT Industries Asset Utilization LLC. | Budapest | Hungary |
| OT Industries Eszközhasznosító Kft. | Budapest | Hungary |
| Otto-von-Guericke-Universität Magdeburg | Magdeburg | Germany |
| Outotec GmbH & Co KG | Oberursel | Germany |
| Oveducon | Naaldwijk | Netherlands |
| Oxxynova GmbH | Steyerberg | Germany |
| OY Säätö Ab | Vantaa | Finland |
| P & M Industrie-Anlagenplanung GmbH | Frechen | Germany |
| P.A. Consultancies - KURZ Instruments Europe | Biddinghuizen | Netherlands |
| PANAM ENGINEERS LTD. | Piludra, Ta. Prantij | India |
| PANTOCHIM | Feluy | Belgium |
| Par Pacific Holdings, Inc. | Houston | United States |
| PARLYM Engineering | Marseille | France |
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