| Name | Region |
|---|---|
| XsolveIT | Limburg |
| Xtreme Internet Solutions B.V.B.A. | Limburg |
| Xylos | Antwerp |
| Xyzt.ai | |
| Yapla | |
| Yell-O-Snow | Brussels-Capital |
| Yellowshape | Antwerp |
| Yet Another Mail Merge | |
| Yitch | |
| Yools | |
| Your Mailing List Provider | West Flanders |
| Zapfloor | |
| ZappTax S.A. | |
| Zeo Internet Services | Hainaut |
| Zeropoint.IT N.V. | |
| ZetaPulse N.V. | |
| ZETES Industries S.A. | |
| Zeus Computer | |
| Zixar | Hainaut |
| Zorabots |