| Butler TechSense Ltd | |
| Buywebhosting.net | Auckland |
| Buzz dot net | Wellington |
| BYTE Computer and Software Ltd | Canterbury |
| Byte Media | Auckland |
| byWeb Design | Wellington |
| Cablecraft | Canterbury |
| Cablemax Ltd | Auckland |
| Cables Direct | Canterbury |
| Cackle Telecommunications | Auckland |
| Cactus Software Ltd | Nelson |
| Cactuslab | Auckland |
| CAD Central | |
| CADMethods Ltd | Auckland |
| Cadpro New Zealand Ltd | |
| Cadpro Systems Ltd | Auckland |
| Calder Electronics | Canterbury |
| Call a Geek | |
| Callaghan Innovation | Wellington |
| Callista | Auckland |
| Campbell Technology Ltd | Wellington |
| Canary Data Solutions Ltd | Auckland |
| Caniwi Design Ltd | Auckland |
| Cannulight Technology | |
| Canon New Zealand Pty Ltd | Auckland |
| Canterbury Angels | Canterbury |
| Canterbury Tech Cluster | Canterbury |
| CantOvation Ltd | Auckland |
| Cardett Associates Ltd | 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 |
| Cello Technology | |
| Central Business Innovation | |
| Central Station | Auckland |
| Centrality | Auckland |
| CerebralFix Ltd | Canterbury |