| Viva Wallet | Attica |
| Vivabank | Attica |
| VNG Digital Group | Attica |
| Vodafone | Attica |
| Vodafone CU | |
| VoiceWeb | Attica |
| Voyatzoglou | |
| VR Productions | |
| w3 | Attica |
| Warply | Attica |
| Wavemotion S.A. | |
| Wdesign | Attica |
| weasic microelectronics S.A. | Attica |
| WeatherXM | Attica |
| Web and Art Solutions | Attica |
| Web Builders | Attica |
| Web Future | Attica |
| Web Online | |
| Web SEO Analytics | Attica |
| Web templates designs | Attica |
| Web-IQ | Attica |
| Web1 | Attica |
| WebArt Active Media | Attica |
| Webcity | Attica |
| WebHellas Ltd | Attica |
| WebIt.bz | Attica |
| WebLogic | Attica |
| Webmakers | Attica |
| Webman Internet Services | Attica |
| Webmasters Life | Attica |
| Webmind | Attica |
| WebOlution | Attica |
| Webstep | Attica |
| Webtec | Attica |
| Wedia | Attica |
| Welcome Pickups | Attica |
| What's Up | |
| Wheels Car Rental System | Attica |
| WinAutomation | Attica |
| WIND Hellas Telecommunications S.A. | Attica |
| Wings ICT Solutions | |
| Wings Systems Ltd | Attica |
| WinMedica | |
| Wirelesslan | Central Macedonia |
| Wizdom | |
| WnetSoft | Attica |
| Women on Top | |
| Workathlon | Attica |
| xDream3D | Attica |
| Xpatit.gr | |