| Name | Region |
|---|---|
| 10Guards OÜ | Harju |
| 1K-Digital.com OÜ | Harju |
| 2Games.com | Harju |
| 2Way OU | Harju |
| 303 Team | |
| 360Pano.eu | Harju |
| 3DC.io | |
| 3KGroup OÜ | |
| 3QWS OÜ | |
| 3R Computers OÜ | Harju |
| 42 Coffee Cups OÜ | |
| 5D Vision | Tartu |
| 8allocate | |
| AA-SAT Professional OÜ | Harju |
| Abit | Harju |
| abz.agency | |
| Accra OÜ | Harju |
| Active Systems | Pärnu |
| Acty Commerce | |
| ADEO Imaging OÜ | Harju |
| ADM Interactive | Harju |
| Advapay | Harju |
| Advendor Network OÜ | |
| Aerokube | |
| Afacerver OÜ | |
| AgileWorks AS | Harju |
| Äio Tech OÜ | |
| Ajujaht | |
| Akrom-Ex | Harju |
| AKTORS OÜ | Harju |
| Aktsiamaailm OÜ | Harju |
| Akupood OÜ | Tartu |
| ALEXKUK OÜ | Harju |
| Alfanet OÜ | Tartu |
| Alium Swap | |
| ALL-TEC Services OÜ | Harju |
| Allies | Harju |
| Alloy Networks | |
| Almic OÜ | Harju |
| Alnicko Lab OÜ | |
| AlphaChat | |
| AlphaGIS | Harju |
| ALSO Eesti AS | Harju |
| Alvera Solutions OÜ | |
| Alvin | |
| Amandus Tehnoloogia OÜ | Harju |
| Ambient Sound Investments | Harju |
| Amon OÜ | Harju |
| Amoniac OÜ | Harju |
| Amphora | Harju |