| CryptoMill Cybersecurity Technologies | |
| Crystal Grave Design Studio | |
| Crystal HDV Communications | British Columbia |
| CS Games | Quebec |
| CS Group, Inc. | |
| CS Soft InfoTech, Inc. | |
| CS Solutions | Ontario |
| CSA Group | Ontario |
| CSAT | Ontario |
| CScience | |
| CSE Hosted PBX Solutions | Ontario |
| Csek Creative | British Columbia |
| CSI eSecure, Inc. | Ontario |
| CSI Power & Environmental, Inc. | Ontario |
| CSIpix | |
| CSN Pharma | |
| CSN Tech Centre Ltd | Ontario |
| CSS, Inc. | Ontario |
| cStar Technologies, Inc. | Ontario |
| CSTI Consulting | Quebec |
| CSWorks, Inc. | British Columbia |
| CT Consulting | |
| CTA | Quebec |
| CTAL | |
| CTC Computer Training | Ontario |
| CTECH Consulting Group | Alberta |
| CTF MEG Neuro Innovations, Inc. | |
| CTI Life Sciences Fund | |
| CTL Alpax Technologie | Quebec |
| CTM Centre de Téléphone Mobile ltée | Quebec |
| CTO.ai | |
| CTRL Informatique Ltée | Quebec |
| ctrlweb | Quebec |
| Cualli Ohtli Digital Marketing | Ontario |
| Cube Software Solutions, Inc. | Alberta |
| Cube6 Systems | |
| Cubehouse Marketing | British Columbia |
| Cubeler, Inc. | |
| CubeWerx | Quebec |
| Cubi Technologies, Inc. | Quebec |
| Cubic Digital | |
| Cubicle Fugitive | Ontario |
| Cubicule Studio | Quebec |
| Cubresa, Inc. | |
| CUFTanalytics | Alberta |
| Cullbridge Communications and Marketing | Ontario |
| Cultivated Eco Systems | |
| Cultivator | |
| Cura Therapeutics | |
| CUREN Consulting | Ontario |