- Castolin Eutectic Group (Castolin Eutectic Holding GmbH)
- Cavator GmbH
- cbs Corporate Business Solutions Unternehmensberatung GmbH
- CBS International Business School
- CECONOMY AG
- CEE Group
- CENTI Warenhandels GmbH
- CES Consulting Engineers Salzgitter GmbH
- CEWE Stiftung & Co.KGaA
- Ch. Dahlinger GmbH & Co KG
- Chamber Orchestra Mannheim - Unesco City of Music (Kurpfälzisches Kammerorchester e.V.)
- Charite CFM Facility Management GmbH
- Chemische Fabrik Karl Bucher GmbH
- CHG-MERIDIAN
- Chocal Packaging Solutions GmbH
- Chrestos Concept GmbH & Co. KG
- CiS electronic GmbH
- City of Berlin
- City of Bonn
- ClimatePartner GmbH
- Clinic & Job Dress GmbH
- CMS Legal Services EEIG
- COC AG
- Cofinpro AG
- Collective Leadership Institute e.V.
- comcut Messeservice GmbH
- cometis AG
- comforte AG
- Commerzbank AG
- COMPACTTEAM event-marketing-concept GmbH
- Company Information Company Rhenus SE & Co. KG
- Compleo Charging Solutions AG
- Compliance Solutions GmbH
- Computomics
- confern Mobeltransportbetriebe GmbH
- Conrad Electronic SE
- Consultport GmbH
- Continental AG
- Control Risks
- Core Technologies GmbH⠀
- Cornelsen Gruppe
- CPM Germany GmbH
- Cpro Industry Projects & Solutions GmbH
- CRCM Corporate Risk & Crisis Management GBR
- Croozer GmbH
- cubemos
- CWS-boco International GmbH
- cyber-Wear Heidelberg GmbH
- d.i.i. Deutsche Invest Immobilien AG
- d.i.i. Investment GmbH
Teilnehmende im UN GCD