| Comcities | Western Province |
| Commercial Bank of Ceylon plc | Western Province |
| Commercial Credit & Finance plc | Western Province |
| Computer Society of Sri Lanka | Western Province |
| Comtech Web Solutions | Western Province |
| Console Electronics (Pvt) Ltd | Western Province |
| Content Management and Solutions (Pvt) Ltd | |
| Creative Software | Western Province |
| Creative Vision | Western Province |
| Creative-2 | Western Province |
| Credence Genomics | Western Province |
| CryptoGen Pvt Ltd | Western Province |
| Crystalaxis Technologies | Western Province |
| CSoft Lanka Technologies | Western Province |
| 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 |
| Devro LABS | Western Province |
| DFCC Bank plc | Western Province |
| Dialog Telekom plc | Western Province |
| Digital Interactive Lab | Sabaragamuwa Province |
| Digital Marketing Outsourcing Pvt Ltd | Central Province |
| Dilexus Infotech Pvt Ltd | |
| DirectPay | Western Province |
| DMS Software Engineering (Pvt) Ltd | Western Province |
| DMS Software Technologies (Pvt) Ltd | |
| DreamJobs.lk | Western Province |
| e-Vision Web Design | Western Province |
| eArrow | |
| East Link Engineering Company Ltd | Western Province |
| Eastern University, Sri Lanka | |
| eDesigners | Western Province |
| EFutures (Pvt) Ltd | Western Province |
| EFutures (Pvt) Ltd | Western Province |
| Eguardian | |
| eInterNext.com | Western Province |
| Elysian Techlabs | Western Province |
| EncryptAsia | |
| Encyte | |
| Enspire Solutions | Western Province |
| Envoy Ortus | |
| ESOFT Metro Campus | |
| Eureka Technology Partners | Western Province |
| eVolve Technologies (Pvt) Ltd | Western Province |
| Extreme Web Design Sri Lanka | Western Province |
| Fortude | |
| FOSS Sri Lanka | Western Province |