| CG Hitech Solutions | |
| Chambre de Commerce Belgo-Luxembourgeoise Roumaine Moldave | |
| Change4Impact Conference | |
| Changeneers | |
| Chirp it away S.R.L. | |
| CHS Grup | Bucharest |
| Cicada Technologies | Bucharest |
| CIEL | Bucharest |
| Cinor S.A. | Bucharest |
| Circuit Design S.R.L. | Bucharest |
| CISEO | |
| CIT Grup | Timiș |
| Civictech România | |
| Class IT Group | |
| Class IT Outsourcing | Bucharest |
| Claus Web S.R.L. | Satu Mare |
| CleanSofts.org | Bucharest |
| Cleanvoice AI | |
| Clever Capital | |
| Clever House Engineering | |
| Cleverage Venture Capital S.R.L. | |
| ClickBrainiacs | |
| Cloud Centric | |
| Cloudfinity | |
| CloudHero | Bucharest |
| Cluj IT Cluster | Cluj |
| Cluj Makers | Cluj |
| Cluj Startups | |
| ClusterCS | |
| Clusterul Regional Inovativ de Imagistică Moleculară şi Structurală Nord-Est | Iași |
| Code Noir | Brașov |
| Code School Clubs | |
| CODE932 | |
| Codecamp Romania | |
| CODECart | |
| Codecube S.R.L. | |
| Codefy Software | Iași |
| CodeMix S.R.L. | |
| CoderDojo | Bucharest |
| CoderDojo România | |
| Codespring | |
| Codette | |
| Codezilla | |
| Codiax | Cluj |
| COERA | |
| Cogentive | |
| cognitive SEO Internet Marketing Tools | Iași |
| Combridge | Bucharest |
| Comknow | Cluj |
| Commergent | |