| Name | Region |
|---|---|
| WhereIsIt-Soft.com | Central Slovenia |
| XCrySDen | Central Slovenia |
| XENYA d.o.o. | Central Slovenia |
| XLAB | |
| XLAB d.o.o. | Central Slovenia |
| XLAB Steampunk | |
| Zabec.net d.o.o. | Central Slovenia |
| Zavod za gradbeništvo Slovenije | |
| Zerodays d.o.o. | |
| Zian Designs | Central Slovenia |
| Znanstveno-raziskovalno središče Koper |