| Cagayan de Oro ICT Business Council | Misamis Oriental |
| Cagayan State University | |
| Camarines Norte State College | |
| Camarines Sur Polytechnic Colleges | |
| Camille Zapata | Metro Manila |
| Capitol University | |
| Capiz State University | |
| Caraga State University | |
| Carl Ocab | Metro Manila |
| Carlos Hilado Memorial State University | |
| carNAVi Corporation | Metro Manila |
| Cavite State University | |
| Cebu Business Park | Cebu |
| Cebu I.T. Park | Cebu |
| Cebu Institute of Medicine | |
| Cebu Normal University | |
| Cebu Web Concepts | Cebu |
| Cebu Web Solutions | |
| cebu-online.com | Cebu |
| Cellconversion | Negros Occidental |
| Central Colleges of the Philippines | |
| Central Luzon State University | |
| Central Mindanao University | |
| Central Philippine University | |
| Centro Escolar University | |
| Cerebro Labs | Metro Manila |
| Chatgenie | Metro Manila |
| CheapDevs PH | |
| CHEQ Systems, Inc. | Metro Manila |
| Chiang Kai Shek College | |
| Cirtek Electronics Corporation | Laguna |
| CIT University | |
| Cite Technical Institute, Inc. | |
| Citrus Online Innovations, Inc. | Metro Manila |
| Cloudwalk Digital | |
| Code Ninja IT Solutions, Inc. | |
| Codebiz IT Solutions | |
| Codes & Pixels | |
| Codomus, Inc. | Metro Manila |
| CoffeeBot Solutions | |
| Colegio San Agustin Bacolod | |
| College of Arts and Technology | Metro Manila |
| College of Development Communication | |
| Columbian College, Inc. | |
| ComClark Network and Technology Corporation | |
| Commsource Systems and Integrated Solutions, Inc. | |
| Commude Philippines, Inc. | Metro Manila |
| Computer Professionals, Inc. | Metro Manila |
| COMTEQ Computer & Business College | |
| Condor POS Solutions RP, Inc. | |