| Cadpro Systems Ltd | Auckland |
| Calder Electronics | Canterbury |
| Callaghan Innovation | Wellington |
| Callista | Auckland |
| Camkyl Computers Ltd | West Coast |
| Campbell Technology Ltd | Wellington |
| Canary Data Solutions Ltd | Auckland |
| Caniwi Design Ltd | Auckland |
| Canon New Zealand Pty Ltd | Auckland |
| Canterbury Angels | Canterbury |
| Canterbury Tech Cluster | Canterbury |
| CantOvation Ltd | Auckland |
| Cardett Associates | Tasman |
| CardLink Systems Ltd | Wellington |
| Cardy Ltd | Auckland |
| Care Free Computing | Canterbury |
| Cartridge Refills | Canterbury |
| Castle Software Ltd | Auckland |
| Castlenet | Wellington |
| Catalyst Cloud | Wellington |
| Catalyst IP | |
| Catalyst.Net Ltd | Wellington |
| Catapult Software | Auckland |
| Catch Design | Wellington |
| Catch Software | Auckland |
| Catchlight Design | Canterbury |
| Caveman technology | Canterbury |
| Cawthron Institute | |
| CDP Group Ltd | Wellington |
| Central Station | Auckland |
| Centrality | Auckland |
| CerebralFix Ltd | Canterbury |
| Cetogenix | |
| Chameleon Creator | Wellington |
| Charles Coxhead | Auckland |
| Cheeky Monkey Hosting | Auckland |
| Chelmer | Auckland |
| 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 |
| CIO New Zealand | Auckland |
| Circle Consulting | Wellington |
| Cleanweb | Wellington |
| Clear View Web Design | Auckland |