- Cactos
- Caidio
- Calori
- Calqulate
- Campus
- Candour
- Canit
- Capalo AI
- Caracom Group
- Carbo Culture
- Carbofex
- Carbonaide
- CardioSignal
- Carna eHealth
- CeLLife
- Centinel Mobiles
- Cerenion
- Cetopo
- Chabla
- Chainfrog
- CHAOS architects
- CH-Bioforce
- Chipmetrics
- Clarvo
- Clevenio
- Clewat
- CloudBounce
- Clouder
- Cluby
- Coachilla
- Coaching WRX
- CollectiveCrunch
- Collo
- Color The Minds
- Combo Breaker
- Commu App
- Comparables.ai
- Comptek Solutions
- ConfidentialMind
- CONNAX
- Connected Finland
- Cooler Future
- CooliBlade
- CoreIoT Technologies Ltd.
- Corle
- Corrsy
- Cover Story
- Critical Charm
- Critix
- Crono Analytics
- Crowst
- Cryptic Cargo
- CSIT Finland
- Ctrl Alt Ninja
- Cube 3.3
- Cumucore
- CurifyLabs