- Cactos
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- Caloom
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- Casambi Technologies
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- CeLLife
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- Chat Republic
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- Checkout Finland
- Chipmetrics
- Choicely
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- Codemenders
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- Collapick Company
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- Collo
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- Combinostics
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- Complink
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- Connected Finland
- Consair
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- Con & Tender
- Contentori
- ContractZen
- Convion
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- Coolbrook
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- CoreHW
- CoreIoT Technologies Ltd.
- Coreorient
- Corle
- Cornfox & Brothers
- Corrsy
- CosmEthics
- Cover Story
- Cozify
- CrashTrail
- Creanord
- Creeng
- Critical Charm
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- Critix
- Crono Analytics
- Cronvall
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- Crowst
- Cryptic Cargo
- CSE Entertainment
- CSIT Finland
- Ctrl Alt Ninja
- Cube 3.3
- Cuckoo Workout
- Cumucore
- CurifyLabs
- Custobar
- Cuutio
- Cyberday
- Cyber Fox Games
