| WIVI Vision | |
| Wiyo | Madrid |
| Woffu Job Organizer, S.L. | Barcelona |
| Woinemer Technology, S.L. | Madrid |
| Woland | |
| Wolters Kluwer España, S.A. | Madrid |
| WonderBits | Valencia |
| Woom | Barcelona |
| Woonivers | Madrid |
| Wooptix, S.L. | Madrid |
| Worksible, S.L. | Valencia |
| World Wide Mobility | Madrid |
| Worldcoo | |
| Worldsensing | Barcelona |
| Wozzo | |
| Wsoko | Barcelona |
| Wualia Studio, S.L. | |
| Wulia | Barcelona |
| Wurth, S.L. | A Coruña |
| wwwarcelona | Barcelona |
| Wyred Web | Madrid |
| WYSIWYG | Barcelona |
| X.25 Informática | Madrid |
| X1Wind | Barcelona |
| Xacom Comunicaciones, S.L. | Madrid |
| Xailer | Madrid |
| XaolServer | Valencia |
| Xarxa Consultoria Informàtica, S.L. | Barcelona |
| Xarxa Control, S.L. | Girona |
| Xatcom | Barcelona |
| Xatinet Solucions Informàtiques, S.L. | Valencia |
| Xave World | Barcelona |
| XenonFactory | Zamora |
| Xepient Solutions | Murcia |
| Xeridia | León |
| Xerintel Internet Technologies, S.L. | Cádiz |
| Xicons Studio | Barcelona |
| Xinxeta Multimedia | Valencia |
| XLI design+thinking | Murcia |
| xNova International | |
| Xoia Extending Reality | A Coruña |
| XpertiX | Barcelona |
| XRDimensions | Navarre |
| Xtasy Games | Madrid |
| XTRARED, S.L. | Sevilla |
| Xtree Serveis Informàtics | Barcelona |
| Xtremis | Barcelona |
| Yaba | Barcelona |
| YAGLE | Balearic Islands |
| Yar Al Roshidi | |