|
 | | Wendt Grundbau GmbH | Berlin |
 | | Drees & Sommer SE | Berlin |
 | | Rhomberg Sersa Rail Group | Dresden, Halle (Saale), Berlin, Spremberg |
 | | Drees & Sommer SE | Berlin, München, Mannheim |
 | | Drees & Sommer SE | Stuttgart, Dresden, Berlin, Köln, Leipzig |
 | | Saint-Gobain Weber GmbH | Berlin, Brandenburg, Mecklenburg-Vorpommern |
 | | Zeppelin Rental GmbH | Berlin |
 | | Rhomberg Sersa Rail Group | Dresden, Halle (Saale), Berlin, Spremberg |
 | | Rhomberg Sersa Rail Group | Dresden, Berlin |
 | | Actemium Controlmatic Mitte GmbH | Dresden, Berlin, Spreetal, Magdeburg, Hannover, Leipzig |
 | | Züblin Spezialtiefbau GmbH | Berlin, Brandenburg |
 | | Rhomberg Sersa Rail Group | Dresden, Halle (Saale), Berlin, Spremberg |
 | | wpd infrastruktur GmbH | Potsdam, Berlin, Mainz, Osnabrück, Rostock, Schleswig |
 | | CDM Smith SE | Berlin |
 | | OMS Prüfservice GmbH | Berlin |