| C-Clarke Institute | |
| CabbageApps (Pvt) Ltd | Western Province |
| Calcey Technologies, LLC | Western Province |
| callOcare | |
| Cambio Software | |
| Capital Alliance Holdings Ltd | |
| Cathects | |
| Cemex Software (Pvt) Ltd | |
| Cenmetrix (Pvt) Ltd | Western Province |
| Central Finance Company plc | |
| Ceylon Business Appliances (Pvt) Ltd | Western Province |
| CipherLabz | |
| Citizens Development Business Finance plc | Western Province |
| Cloud Solutions International Pvt Ltd | |
| Co-Energi (Pvt) Ltd | |
| Coconut Research Institute | |
| Code Surge | Western Province |
| Codeaffinity Technologies | Western Province |
| CodeCup (Pvt) Ltd | Western Province |
| CodeSec Global | |
| CodeWox | Western Province |
| Codezela Technologies | Western Province |
| Cogniata | |
| Comcities | Western Province |
| Commercial Credit & Finance plc | Western Province |
| Computer Society of Sri Lanka | Western Province |
| Console Electronics (Pvt) Ltd | Western Province |
| Content Management and Solutions (Pvt) Ltd | |
| Corzent | |
| Creations Arena | |
| Creative Software | Western Province |
| Creative Vision | Western Province |
| Creative-2 | Western Province |
| Creativo Code | |
| Credence Genomics | Western Province |
| CryptoGen Pvt Ltd | Western Province |
| Crystalaxis Technologies | Western Province |
| CSoft Lanka Technologies | Western Province |
| Cubemak Labs (Pvt) Ltd | |
| Cubo Systems | Western Province |
| Cyber Concepts | Western Province |
| Datamation Systems (Pvt) Ltd | Western Province |
| DataWin Corporate Solutions (Pvt) Ltd | Western Province |
| Debug Group of Companies | Western Province |
| DesignSolv Pvt Ltd | Western Province |
| Devbranch | |
| Devro LABS | Western Province |
| Dialog Telekom plc | Western Province |
| Digiratina Technology Solutions | |
| Digital Interactive Lab | Sabaragamuwa Province |