| Wikicasa S.r.l. | Milan |
| WimTV | Turin |
| Win S.r.l. | Arezzo |
| Win2PDF | Lucca |
| Wind Tre S.p.A. | Milan |
| WiNK S.r.l. | Rome |
| Winlog SCADA Software Forum | Rome |
| Wintel S.r.l. | Latina |
| Wired Italia | Milan |
| Wireshop | Milan |
| WISE S.r.l. | |
| Wise SGR S.p.A. | Milan |
| Wiseair S.r.l. | |
| Withless | |
| Wizkey S.p.A. | |
| WOA Studio | |
| Wopta Assicurazioni S.r.l. | |
| Wordbonus S.r.l. | Milan |
| WordLift S.r.l. | |
| WorkInvoice | Milan |
| World on IP | Turin |
| Wowlab S.r.l. | |
| WP Web S.r.l. | Turin |
| WpSEO S.r.l.s. | |
| Wsense | Rome |
| WuBook | Pesaro and Urbino |
| Würth Phoenix S.r.l. | South Tyrol |
| WWG S.r.l. | |
| Wylab | Genoa |
| X Service S.r.l. | Bologna |
| X23 | Milan |
| X5G S.n.c. | Avellino |
| XAOS Systems S.r.l. | Rome |
| XData | Milan |
| Xenioo | Lecco |
| Xion Informatica S.n.c. | Milan |
| Xister Reply S.r.l. | Rome |
| XNEXT S.p.A. | |
| XPLAB | Brescia |
| XRIT S.r.l. | Sassari |
| Xronos S.r.l. | Bari |
| Xstream Labs | Turin |
| XStream S.r.l. | Turin |
| Xstream S.r.l. | Reggio Emilia |
| Xteam S.r.l. | Perugia |
| Xtranet S.r.l. | Genoa |
| xtream S.r.l. | Milan |
| Xware | Bergamo |
| Xyence Capital SGR S.p.A. | |
| Yacme S.r.l. | Bologna |