- CaddieON
- Cajo Technologies
- CallCompany
- Call Stream AI
- Caloom
- Cambri
- Canatu
- Capricode
- Carbofex
- Carbonaide
- Carbons
- CarboReal
- Carecode
- Casambi Technologies
- Catchbox
- Cavitar
- CCM-Power
- Centinel Mobiles
- Ceruus
- Chabla
- Channel37
- Chat Republic
- CH-Bioforce
- Checkout Finland
- Choicely
- Ciegus
- City Digital
- Citynomadi
- Claned
- Claro
- Clarvo
- Cleverday
- Cleworks
- Climbstation
- Cloubi
- Cloud Asset
- Cloudator
- Cloud Edge
- Cloudia
- Cloud'n'Sci
- Cluby
- Coach4Pro
- Cocie AI
- Codemenders
- Codership
- CodeSpace
- Coinmotion
- Collapick Company
- Collob
- Colossal Order
- Combinostics
- Combo Breaker
- Commu App
- Comparables.ai
- Complink
- Comptek Solutions
- Conexbird
- Confidex
- Confoot
- Congrid
- Conmio
- CONNAX
- Connected Finland
- Consair
- Consight
- Contentori
- ContractZen
- control.dev
- Convion
- Coodio
- Coolbrook
- CoreHW
- Coreorient
- Cornfox & Brothers
- CosmEthics
- Coubonga
- Cozify
- CrashTrail
- Creanord
- Creeng
- Critical Charm
- Critical Force
- Cronvall
- Crowdchupa
- Crowst
- CSE Entertainment
- Ctrl Alt Ninja
- Cube 3.3
- Cuckoo Workout
- Cumucore
- Custobar
- Cuutio
- Cyberday
- Cyber Fox Games
