| Wüstenrot & Württembergische GmbH | |
| WW Systemberatung GmbH | Baden-Württemberg |
| WWC-Consulting GmbH | |
| WWE-Media GmbH | Hamburg |
| wweb.dev | |
| WWM GmbH & Co. KG | |
| wwwReality | |
| wysiwyg Software Design GmbH | North Rhine-Westphalia |
| X-CD-Roast | Bavaria |
| x-cellent Technologies GmbH | Bavaria |
| X-Immersive | |
| X-map AG | North Rhine-Westphalia |
| X-Mediasat | North Rhine-Westphalia |
| X-NRW GmbH | North Rhine-Westphalia |
| x-root Software GmbH | Bavaria |
| X-Software GmbH | Bavaria |
| X-Tables | North Rhine-Westphalia |
| X-Vax Technology | |
| X-Visual Technologies GmbH | Berlin |
| X-Ways Software Technology AG | North Rhine-Westphalia |
| X-Wind Powerplants GmbH | |
| X.net 2000 GmbH | Hesse |
| x1F GmbH | |
| XAAS GmbH & Co. KG | |
| Xacon Unternehmensberatung GmbH | Baden-Württemberg |
| Xaidung CRM | North Rhine-Westphalia |
| Xaldon Technologies GmbH | Bavaria |
| Xamira networks GmbH | Baden-Württemberg |
| XANADU-Internetagentur | Berlin |
| xanario ID Ltd | Saxony |
| Xanders GmbH | North Rhine-Westphalia |
| XAPI Software GmbH | Rhineland-Palatinate |
| Xapio GmbH | Bavaria |
| Xaption GmbH | Baden-Württemberg |
| Xara GmbH | Berlin |
| Xaver Group GmbH | |
| Xavveo GmbH | |
| Xayn AG | Berlin |
| XBA Software AG | Hamburg |
| Xbird GmbH | |
| XBK- Kabel Xaver Bechtold GmbH | Baden-Württemberg |
| Xceptance Software Technologies GmbH | Thuringia |
| XCharge Europe GmbH | |
| Xconsult Webdesign & Media | Hesse |
| XDECK GmbH | |
| XeedQ GmbH | |
| XEGO-it GmbH | |
| Xeko GmbH | Schleswig-Holstein |
| Xelera Technologies GmbH | |
| Xell AG | |