| WorldNet | Auckland |
| WorldNZ | Auckland |
| WorldxChange Communications Ltd | Auckland |
| WPStudio | |
| Wright Technologies | Auckland |
| WriteMaps | Auckland |
| WTE Ltd | Canterbury |
| WWW Design | Auckland |
| XACT Software Solutions | Auckland |
| XenoDream Software | Wellington |
| Xeperno | |
| Xequte | Wellington |
| Xero Ltd | Wellington |
| Xpress Net Ltd | Wellington |
| XR Pharmaceuticals Ltd | |
| XSOL Ltd | Auckland |
| Xtal Mountain Information Technology | Auckland |
| Xtreme Networks Ltd | Wellington |
| YD Systems | |
| YetiTech | |
| YetiTech | |
| Yield | |
| Yonder HQ | |
| Yoobee School of Design | Auckland |
| Yoper Ltd | Auckland |
| Yorb Ltd | Manawatu-Wanganui |
| YoungShand | Auckland |
| Your Computer Guy | |
| Youtap Ltd | Auckland |
| YouX Ltd | Wellington |
| Z Web Ltd | Canterbury |
| Zantech | |
| Zapperr | |
| Zeald IP Ltd | Auckland |
| ZebraTech Ltd | |
| Zenbu Networks Ltd | Auckland |
| Zenith Technology Ltd | |
| Zenith Tecnica | |
| Zentech Ltd | Waikato |
| Zephyr IT | Auckland |
| ZeroPoint Ventures Ltd | Wellington |
| Zest IT Ltd | Auckland |
| Zino Ventures | Auckland |
| Zintel | Auckland |
| Zohar Ltd | Auckland |
| Zoom Infotech | Auckland |
| Zoom Tech | |
| ZoomCloud | |
| ZUMA Web + Design Studio | Otago |
| Zyber Ltd | Auckland |