| Certa Solutions | |
| Cetogenix | |
| Cezaa Ltd | |
| CG Design | |
| Chalk n Cheeze | |
| Challenge Computers | |
| Chameleon Creator | Wellington |
| Charles Coxhead | Auckland |
| Check Rabbit Design | |
| Cheeky Monkey Hosting | Auckland |
| Chelmer | Auckland |
| Chemware Software | |
| Cheq Soft | Wellington |
| Chillifactor | Auckland |
| Chillisoft | Auckland |
| Chirpy | Auckland |
| Chreos | Canterbury |
| Christchurch Hacker Conference 2020 | Canterbury |
| Chrometoaster New Media Ltd | Wellington |
| Cicada | Otago |
| Cin7 | Auckland |
| Circle Consulting | Wellington |
| Cleanweb | Wellington |
| Clear View Web Design | Auckland |
| Clearfield Software Ltd | Auckland |
| ClearPoint Ltd | Auckland |
| Clever Internet | Auckland |
| Click Online | Auckland |
| Click suite | Wellington |
| ClickFix | |
| ClickThrough | Auckland |
| ClikOnce Ltd | Auckland |
| Clockit Software Ltd | |
| Cloud Digital Media | |
| Cloud IT | Bay of Plenty |
| Cloud My Staff | Otago |
| CLOUD39 | Auckland |
| CloudCannon Ltd | Otago |
| Cloudservices | |
| CLVR Cloud | Wellington |
| CNC Design Ltd | Auckland |
| CNX | |
| Co-sys group | Auckland |
| Cobussen | Auckland |
| Cobweb Designs | Otago |
| Code Avengers | Auckland |
| Code Camp Wellington | Wellington |
| Code Stage Ltd | |
| CodeClouds | Wellington |
| CodeFluent | |