|
| | alwitra GmbH | Trier |
| | NEXPLORE Technology GmbH | Essen, Darmstadt, München |
| | STRABAG Property and Facility Services GmbH | Hamburg, Hannover |
| | Ed. Züblin AG | Region Rostock |
| | Ed. Züblin AG | Seevetal-Hittfeld |
| | STRABAG Rail GmbH | Leipzig |
| | STRABAG AG | Dresden, Leipzig, Chemnitz, Berlin |
| | Ed. Züblin AG | Buchholz in der Nordheide |
| | Goldbeck Public Partner GmbH | Braunschweig |
| | Bauwens Construction GmbH & Co. KG | Köln |
| | STRABAG Rail GmbH | Berlin |
| | Ed. Züblin AG | Frankfurt am Main |
| | STRABAG Property and Facility Services GmbH | Unterföhring |
| | STRABAG BRVZ GmbH & Co. KG | Köln |
| | Drees & Sommer SE | Berlin |