| Name | Region |
|---|---|
| Datagate Arvutid | Harju |
| DataGates Group OÜ | Harju |
| Datasec OÜ | Harju |
| Datastake | |
| DBWeb | |
| Deaction | Harju |
| Dealum OÜ | |
| DeCrypto | |
| DeepBurner | Harju |
| DEIP | |
| Deltmar OÜ | Harju |
| DesignFirst | |
| Dev.family OÜ | |
| Develop | Harju |
| DevGame OÜ | |
| Devtailor | |
| DevTernity OÜ | |
| DevTraining | |
| DigiDeli | Harju |
| Digimaja | |
| Digimarket OÜ | Harju |
| Digipurk OÜ | |
| DigiSoov OÜ | |
| Digisound.ee | Harju |
| Digistep OÜ | Pärnu |
| Digital Fruit | Harju |
| Digital Invest OÜ | |
| Digital Sputnik Lighting | |
| Digitugi | |
| Digiturundus | |
| DIgu | Tartu |
| Diotech OÜ | |
| doCode Development OÜ | |
| DreamApply | |
| DriveX Technologies OÜ | |
| DRL OÜ | Harju |
| Dron.ee | |
| Duplicator 24/7 | Harju |
| e-Estonia | Harju |
| e-Government Academy | |
| E-Kursused | Harju |
| E-People OÜ | Harju |
| E-pood OX Eesti OÜ | Harju |
| e5.ee | |
| EastBAN | |
| EchoGlobal OÜ | |
| Ecofleet Eesti OÜ | Harju |
| eD Insenerid | |
| Edicy | Harju |
| Edisoft | Harju |