| CMS Web Solutions, Inc. | Ontario |
| CMT Systems, Inc. | Alberta |
| CMX Research, Inc. | |
| CNB Computers, Inc. | Ontario |
| CNIB Access Labs | |
| CNTLC Computer Networks Telecom Learning Center | Ontario |
| CNUX Technologies, Inc. | Ontario |
| Co-Op@Home | |
| Co. & Co. | Nova Scotia |
| Co. Innovation Centre | |
| co.labs | Saskatchewan |
| co2digital, Inc. | Ontario |
| CO4 Computing, Inc. | Ontario |
| Coala Studio Ltd | |
| Coalia | |
| Coash | |
| Coast Internet | British Columbia |
| Coast Internet Publishing | British Columbia |
| Coast Mountain College | |
| Coast Web Co. | British Columbia |
| Coastal Integrated Technologies Ltd | British Columbia |
| Coastal Resource Mapping | British Columbia |
| Coastal Webmasters | British Columbia |
| Cobalt Blockchain, Inc. | Ontario |
| Cobionix Corporation | |
| Cobra I-Logiq Security, Inc. | British Columbia |
| Cobra Informatique | Quebec |
| Cobra Integrated Systems | British Columbia |
| Cobra Venture Corporation | |
| Cochrane Computers | Alberta |
| Coconut Game Studio | |
| Coconut Software | Saskatchewan |
| Coconut Software Corporation | |
| Codagesoft, Inc. | |
| Codasys, Inc. | Quebec |
| Coddict | Quebec |
| Code 18 | |
| Code and Effect | |
| Code Creators | Ontario |
| Code Derive, Inc. | |
| Code Farms, Inc. | Ontario |
| Code for Canada | Ontario |
| Code Maximus | |
| Code MTL | Quebec |
| Code One Media | |
| Code Pixel | |
| Code Revolt Software | Ontario |
| Code Web Design & SEO | Alberta |
| Code-Med | Manitoba |
| Code.Affinity() | Ontario |