| Comparables.ai | |
| Comptek Solutions Oy | |
| Connected Finland Oy | |
| Connected Inventions Oy | |
| Connexor Oy | Uusimaa |
| Conor Venture Partners | Uusimaa |
| Contractzen | |
| Convion Ltd | |
| Core Service Oy | |
| Corellia Helsinki Oy | |
| Cosmic Lounge | |
| Cozify Oy | |
| Crafthouse Oy | |
| Creacomp | |
| Create React App | |
| Critical Force | |
| CSC | Uusimaa |
| CSC - Tieteen Tietotekniikan Keskus Oy | |
| CSI Helsinki | |
| CubiCasa | North Ostrobothnia |
| CurifyLabs Oy | |
| Cybercube Oy | |
| D-Fence Oy | Uusimaa |
| DA-Group | |
| Data Group | Uusimaa |
| Data Prisma | |
| Data-Enter Oy | |
| Data-Systems | Uusimaa |
| DataCrunch.io | |
| Datafisher | |
| DataPartner Oy | |
| Datatronic | Päijänne Tavastia |
| Daysave Ltd | |
| Dazzle | |
| Dazzle Rocks | |
| Dealsign Solutions Oy | |
| Dear Lucy Oy | |
| DeFi | |
| Delfoi Oy | |
| Delicode Ltd | |
| DelSiTech Ltd | |
| Deltabit | Pirkanmaa |
| Deltasoft Mobile, Inc. | Uusimaa |
| Desentum | |
| Desentum Oy | |
| Deskartes Oy | Uusimaa |
| Detection Technology Oyj | Uusimaa |
| Devaten | |
| devChallenges | |
| Devea Software Oy | |