| Name | Region |
|---|---|
| Commons | |
| Compact Studio | Cluj |
| Competitors App S.R.L. | |
| Compusoft | Bucharest |
| Compusoft Prod S.R.L. | Bucharest |
| Computer Expert | Bucharest |
| Computer Solution | Iași |
| ComputerLand Romania | Bucharest |
| Computers Group | Bacău |
| Computerscom | Alba |
| Comrace Computera | Dolj |
| Comunicaţii mobile | Bucharest |
| Concept24 Online S.R.L. | Bucharest |
| CONCEPTHYPE | |
| ConcretConsult S.R.L. | Bucharest |
| Conectiva | Bucharest |
| Conectoo | |
| Confidas | |
| Connect Media | |
| Connect Romania | Bucharest |
| Connections Consult S.A. | |
| Connections Tech | |
| Connsys | |
| Consi Serv | Dolj |
| Consoft | Bucharest |
| Consult Line | |
| Conta Pro | Bucharest |
| ContentSpeed | Bucharest |
| Contimar Consulting | Bucharest |
| Control Data Systems | |
| Control F5 Software | |
| ConturSoft | |
| Convex Network | |
| Copier Tech S.R.L. | Bucharest |
| Copy Service S.R.L. | Bucharest |
| Coral Design | |
| Cos Software Solutions | Bucharest |
| Costom Style | |
| Cosys Computer Systems | Covasna |
| Coworking Bucuresti 160 | |
| Coworkperativa | |
| Craf Interactive S.R.L. | Bucharest |
| Craftars | |
| Crafting Software | Cluj |
| Creadiv | |
| Creare Site Web | Bucharest |
| CreareWEB.ro | |
| Creatif | |
| Creative Ones | |
| Creative Tim | Bucharest |