There are three companies involved in the Regiobahn operations:
Regionale Bahngesellschaft Kaarst-Neuss-Düsseldorf-Erkrath-Mettmann-Wuppertal mbH (shortened as Regiobahn GmbH) is the railway infrastructure manager between Kaarst and Neuss, and between Düsseldorf-Gerresheim and Wuppertal-Dornap junction.
RBE Rheinisch-Bergische Eisenbahn is the brand name of Transdev Rheinland GmbH, which has been contracted to operate the train service on behalf of Regiobahn Fahrbetriebsgesellschaft mbH.