| Client name | City | Country |
|---|---|---|
| Allessa GmbH | Frankfurt am Main | Germany |
| alpha meß-steuer-regeltechnik gmbh | Leipzig | Germany |
| Alstom | Stuttgart | Germany |
| ALSTOM Carbon Capture GmbH | Mainz-Kastel (Wiesbaden) | Germany |
| ALSTOM Deutschland AG | Mannheim | Germany |
| Alstom Power Service GmbH | Berlin | Germany |
| AlzChem Trostberg GmbH | Trostberg | Germany |
| Anlagen und Engineering Büro GmbH | Magdeburg | Germany |
| Arasin GmbH | Voerde | Germany |
| ARCA Regler GmbH | Tönisvorst | Germany |
| ArcelorMittal Bottrop GmbH | Bottrop | Germany |
| Argo-Anleg GmbH | Wesel | Germany |
| ARI-Armaturen | Schloß Holte-Stukenbrock | Germany |
| artec Armaturen und Industrieservice GmbH | Leegebruch | Germany |
| Artes Valve & Service GmbH | Velten | Germany |
| Arthur Steinebach GmbH | Nentershausen | Germany |
| ARVOS GmbH | Kassel | Germany |
| ARVOS GmbH | Düsseldorf | Germany |
| ASV Stübbe GmbH & Co. KG | Vlotho | Germany |
| Aucotec GmbH | Hannover | Germany |
| Aurubis AG | Hamburg | Germany |
| Aventis Research & Technologies GmbH & Co KG | Frankfurt | Germany |
| AviComp Controls GmbH | Leipzig | Germany |
| Axalta Coating Systems Germany GmbH & Co. KG | Wuppertal | Germany |
| AZ-Armaturen GmbH | Mönchweiler | Germany |
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