| CodeHQ | |
| CodeLingo | Otago |
| CodeMyWeb | |
| Cogent Ltd | Auckland |
| Cohesion Online Ltd | Bay of Plenty |
| Com-Centre Communication Equipment Ltd | Auckland |
| Comet Backup | |
| Command IT | Auckland |
| CommArc | |
| Commercial Communications Council | Auckland |
| CommKit | |
| Communica | Auckland |
| Company-X | Waikato |
| Compass | Wellington |
| Compass Business Partners Ltd | Canterbury |
| Compel Computer Services Ltd | Waikato |
| Compliance Solutions Ltd | Auckland |
| Compu Print | |
| Compu-IT Ltd | Taranaki |
| Compucon New Zealand | Auckland |
| Computablility NZ Ltd | Auckland |
| Computer & Telephone Services Ltd | Wellington |
| Computer and Network Systems | Waikato |
| Computer and Telephone Services Ltd | |
| Computer Centre (1990) Ltd | Canterbury |
| Computer Craft | Auckland |
| Computer Enhancements NZ Ltd | Auckland |
| Computer Forensics NZ Ltd | Auckland |
| Computer Fusion | |
| Computer Geek Services | Canterbury |
| Computer Geeks | Waikato |
| Computer Help NZ Ltd | Canterbury |
| Computer Lessons Made Easy | |
| Computer Lounge | Auckland |
| Computer Network Support Ltd | Wellington |
| Computer Partners | Wellington |
| Computer Recyclers | Bay of Plenty |
| Computer Repairs Invercargill | |
| Computer Sense Ltd | |
| Computer Shop Timaru 2000 Ltd | Canterbury |
| Computer Signs | |
| Computer Solution Engineering Ltd | |
| Computer Technologies Ltd | Nelson |
| Computer Troubleshooters Wellington South | Wellington |
| ComputerFood Ltd | Auckland |
| Computerforce | Auckland |
| Computers and Beyond | |
| Computers at Work Ltd | Waikato |
| Computers Downunder | Northland |
| Computerz and More | |