| Name | Region |
|---|---|
| Xappfactory | |
| xChange AS | |
| Xolo OÜ | Harju |
| Xysum | Harju |
| Y-Productive | |
| Yanu | Harju |
| YEInternational AS | Harju |
| Yeka Studio OÜ | |
| Yelk Software OÜ | |
| Yera | |
| Yorso Europe OÜ | |
| Zaat.dev | |
| Zagroza OÜ | |
| Zam.io | |
| Zangll | |
| Zaproo | Harju |
| Zeew OÜ | |
| Zero Media | Harju |
| Zeroconf OÜ | |
| Zest Logic | |
| Zetico | |
| Zimplit Ltd | Tartu |
| Zoftify Eesti OÜ | Harju |
| Zone Media OÜ | Harju |
| Zubax Robotics | Harju |
| ZuriAnalytics | Harju |