- Challenge8
- Change health care
- Checkout
- Choco
- Choco Communications GmbH
- Chr. Hansen
- ChurchDesk
- Cielo
- Cigna International Health Insurances
- CIL Management Consultants
- Circle K
- CircleCI
- Cisco Systems
- Cision
- Citco
- Citi
- Citrix Systems
- City Unscripted
- claas group
- Claremont Consulting
- Clariant
- Clark
- CLEVIS GmbH
- CLEVIS Research GmbH
- Climate Focus Berlin GmbH
- ClimatePartner
- Climedo Health
- Cloud Theatre
- Cloudera
- CloudFlare
- Cloudreach
- Club Dance Holidays
- Clue
- Clue by Biowink GmbH
- Clutter
- CLX Communications
- Coca-Cola
- Cognizant Technology Solutions
- Cohesity
- Coinbase
- Colgate-Palmolive
- Coloplast
- comatch
- COMATCH GmbH
- Comcast
- Comdirect