| Upward | |
| Useberry | Attica |
| VALUE | |
| VectorDraw | Attica |
| Velocity.Partners Venture Capital | |
| Velti | Attica |
| VentureFriends | |
| VentureGarden | |
| Vermantia | |
| VisionCA.gr | Attica |
| Vistoweb | Attica |
| Viva Payment Services Single Member S.A. | |
| Viva Wallet | Attica |
| Vivi Papaliaga | |
| VNG Digital Group | Attica |
| Vodafone | Attica |
| Vodafone CU | |
| VoiceWeb | Attica |
| Voyatzoglou | |
| VR Productions | |
| Vulcan Forged | |
| w3 | Attica |
| Warply | Attica |
| Wavemotion S.A. | |
| Wdesign | Attica |
| We fix it | |
| weasic microelectronics S.A. | Attica |
| WeatherXM | Attica |
| Web and Art Solutions | Attica |
| Web Builders | Attica |
| Web Bunch | |
| Web Future | Attica |
| Web Online | |
| Web SEO Analytics | Attica |
| Web templates designs | Attica |
| Web-IQ | Attica |
| Web1 | Attica |
| WebArt Active Media | Attica |
| Webcity | Attica |
| Webfusion | |
| WebHellas Ltd | Attica |
| WebIt.bz | Attica |
| WebLogic | Attica |
| Webmakers | Attica |
| Webman Internet Services | Attica |
| Webmasters Life | Attica |
| Webmate | |
| WebOlution | Attica |
| Websidev | |
| Webstep | Attica |