| Clockwork Acorn (Pty) Ltd | |
| Cloud Group | Gauteng |
| Cloud Services (Pty) Ltd | Gauteng |
| Cloudfusion | |
| CMC Networks | Gauteng |
| CMW Automation (Eastern Cape) (Pty) Ltd | Eastern Cape |
| co.za Domain Administration | Gauteng |
| Coastal KZN TVET College | |
| Cobi Interactive | Western Cape |
| Cocopine Design Solutions | Gauteng |
| Code Synthesis | Western Cape |
| Code Zero | Gauteng |
| Codebridge Labs | Western Cape |
| Codenatics | |
| Codeo | KwaZulu-Natal |
| codeX | Western Cape |
| CODIEZ | Gauteng |
| Coffeebean Web Design | Gauteng |
| Cognite Marketing | Gauteng |
| Coherent Software Solutions | KwaZulu-Natal |
| Colad Design Studio | North West |
| Collectvest (Pty) Ltd | |
| Come Alive | KwaZulu-Natal |
| Commercial Internet Solutions CC | Eastern Cape |
| Commercial Merchants | Gauteng |
| Compact Computer Solutions | Gauteng |
| Company Web Design | |
| Complete Computer Services | Western Cape |
| Complete Enterprise Solutions | Gauteng |
| COMPRSA | Eastern Cape |
| CompSol | |
| CompuJobs | Western Cape |
| Compulink | Gauteng |
| Compusafe Electronic Asset Security | KwaZulu-Natal |
| Computate | KwaZulu-Natal |
| ComputecSA | Western Cape |
| Computek | Western Cape |
| Computer Corporation @ Mayville | Gauteng |
| Computer Foundation (Pty) Ltd | Gauteng |
| Computer Maintenance & Repair | Gauteng |
| Computer Monkeys | Western Cape |
| CompXCell | Western Cape |
| Comtech | Gauteng |
| ComX computers | Gauteng |
| Concept Images Pty Ltd | |
| Conflated Solutions (Pty) Ltd | KwaZulu-Natal |
| Connectivity Database Technologies | Gauteng |
| Conor Information Technology (Pty) Ltd | Gauteng |
| Conqueror Technologies | Gauteng |
| Consnet | Gauteng |