| WHG Internetservice UG (haftungsbeschränkt) | Baden-Württemberg |
| White Label Advisory GmbH | |
| White Owl Capital AG | |
| Whitebox GmbH | |
| WHU – Otto Beisheim School of Management | Rhineland-Palatinate |
| Wi Venture Management GmbH | Rhineland-Palatinate |
| Wibu-Systems | Baden-Württemberg |
| WiCAM GmbH | Baden-Württemberg |
| WICE GmbH | Hamburg |
| Wichmann Datentechnik Sangerhausen GmbH | Saxony-Anhalt |
| Wichmann Systemhaus GmbH | Lower Saxony |
| Wichterich & Partner Gesellschaft für EDV-Dienstleistungen mbH | North Rhine-Westphalia |
| Widap Electronic Components GmbH & Co. KG | Bavaria |
| WidasConcepts GmbH | Baden-Württemberg |
| Widemann Systeme GmbH | Hesse |
| Wiebel und Partner GmbH | |
| Wiedemeier Kommunikation GmbH | North Rhine-Westphalia |
| Wiedenbach Apparatebau GmbH | Baden-Württemberg |
| Wiek IT - Consulting & Systems GmbH | |
| Wien Computer Expert GmbH | Schleswig-Holstein |
| Wiesemann & Theis GmbH | North Rhine-Westphalia |
| Wiest AG | Bavaria |
| Wigital GmbH | Schleswig-Holstein |
| Wikando GmbH | Bavaria |
| wikendu GmbH & Co. KG | Hesse |
| Wikifolio Financial Technologies AG | |
| wiko Bausoftware GmbH | Berlin |
| WILD Connect GmbH | Baden-Württemberg |
| Wildau Institute of Technology | |
| Wildstyle Network | Saxony |
| Wiley-VCH GmbH | |
| Wilhelm Büchner Hochschule | |
| wilhelm.tel GmbH | |
| Wilken Software Group | Baden-Württemberg |
| Will + Folger Industrieelektronik GmbH | North Rhine-Westphalia |
| Will Software | Hesse |
| Willtec Messtechnik e.K. | Baden-Württemberg |
| WiMo Antennen und Elektronik GmbH | Rhineland-Palatinate |
| Win-Seminar | North Rhine-Westphalia |
| win.rar GmbH | Berlin |
| Wind Internethaus GmbH | Baden-Württemberg |
| Wind Mobility GmbH | |
| Wind-Power GmbH | Hesse |
| Windata GmbH & Co. KG | |
| windCORES | |
| Windhoff Software Services | North Rhine-Westphalia |
| Windowsforum.de | Rhineland-Palatinate |
| Windpower GmbH | Bavaria |
| Windream GmbH | North Rhine-Westphalia |
| Wingcopter GmbH | |