| Curative | Auckland |
| Cure Kids Ventures Ltd | Auckland |
| CuroNZ Ltd | Waikato |
| Custom website designers | Auckland |
| CustomComputers | Canterbury |
| CustomD | Canterbury |
| Cyber Spot | Auckland |
| CyberCom | Auckland |
| CyberKode | Auckland |
| Cyclone Computer Co Ltd | Auckland |
| Daisy Lab | |
| Dalyn Software Ltd | Wellington |
| Dash Design | Auckland |
| Data Management Solutions Ltd | Wellington |
| Data Recovery Services Ltd | Canterbury |
| Data Synthesis Ltd | Auckland |
| Data.gov.nz | Auckland |
| Data4U Ltd | Auckland |
| Databases By Design Ltd | Wellington |
| Datacable | Auckland |
| Datacom | Auckland |
| Datadog | Bay of Plenty |
| Datagroup Solutions | Auckland |
| DataguardNZ Ltd | Auckland |
| Dataimporter | Auckland |
| Datalab Ltd | Auckland |
| DataTorque | Wellington |
| Davanti Consulting Ltd | Auckland |
| DBS Business Systems Ltd | Auckland |
| DCL Computer Services | Wellington |
| Decisive Flow | Wellington |
| Deepsouth Technology Ltd | Otago |
| Definitive Media | Wellington |
| Dencom New Zealand Ltd | Auckland |
| Design 2Cam Ltd | Auckland |
| Design Arts | Gisborne |
| Design Lounge Ltd | Wellington |
| Design Website | Waikato |
| Designer Digital | Auckland |
| Designer Websites | Auckland |
| Designhand Ltd | Auckland |
| Deviceware Ltd | Canterbury |
| Devine Computing Ltd | Hawke's Bay |
| DGTL Technologies Ltd | Auckland |
| Dick Smith | Auckland |
| Dicker Data Ltd | Auckland |
| Digit Consulting Ltd | Auckland |
| Digital Arena | Auckland |
| Digital Fusion Ltd | Canterbury |
| Digital Health Association New Zealand | |