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| Chroma Computación | Buenos Aires |
| Chubut IT | |
| Ciber 2000 | Buenos Aires |
| Ciberiada | Buenos Aires |
| Cibersoft Internet | Buenos Aires |
| CIDICOM Soluciones | Buenos Aires |
| Ciencia Hoy | |
| Circuitos Impresos SEI | Buenos Aires |
| Circulo Agencia | |
| Citaldoc | |
| Clarity S.A. | Buenos Aires |
| Claro Argentina | Buenos Aires |
| Clarolab | |
| Clase X - Ingeniería de software | Santa Fe |
| Clic Multimedia | Buenos Aires |
| Click | Buenos Aires |
| Clientum | |
| Clínica Universitaria Reina Fabiola | |
| Clover Sistemas S.R.L. | Santa Fe |
| CMSOFT | Buenos Aires |
| Codealike | Buenos Aires |
| CODES, S.A. | Buenos Aires |
| Codeworking | Buenos Aires |
| Cognisys | Buenos Aires |
| COHEN Sistemas | |
| Colegio Universitario IES | |
| Colinet Trotta | Buenos Aires |
| Colpix | Buenos Aires |
| Colppy | |
| ComentaTV | Buenos Aires |
| Comercia Digital | |
| Comercial I.C. S.A. | Buenos Aires |
| Comision Nacional de Actividades Espaciales | |
| Comisión Nacional de Valores | Buenos Aires |
| Competir | Buenos Aires |
| Competitividad Empresaria S.A. | Buenos Aires |
| CompExcell | Buenos Aires |
| ComPlus | Buenos Aires |
| Compucanjes | Buenos Aires |
| Compumanias | Buenos Aires |
| CompuMar | Buenos Aires |
| Compumundo, S.A. | Buenos Aires |
| Computec, S.R.L. | Buenos Aires |
| Comsur S.R.L. | Buenos Aires |
| Comunicarte | Buenos Aires |
| Concepto Sur | Buenos Aires |
| Concreto Group | |
| Conde Graphics SEO Agency | |
| Conexia | |