| Astory Technology S.A. | |
| Astral-Byte | |
| Astrali | |
| ATEC Global Systems S.R.L. | Bucharest |
| ATEX Computer | Cluj |
| Atlas Networking | |
| Atom Hosting, LLC | Sibiu |
| Atracode S.R.L. | |
| Atta Systems | |
| AttoSoft | Bucharest |
| Attractiv.ro | Bucharest |
| ATU Consulting | |
| Atxcomputers | Prahova |
| Autonik.ro. S.R.L. | |
| Autonova | |
| Autoritatea naţională de reglementare în comunicaţii şi tehnologia informaţiei | Bucharest |
| Autoworld | |
| Avangarde Software Solutions | Cluj |
| Avansis Web Shop | Brașov |
| Avant Business Events Solutions | |
| Avanticart | |
| AVChat | |
| Avicena Computers | Iași |
| Avitech Co. S.R.L. | |
| Awardo | |
| AWS Galaxy | |
| AWSummit | |
| Axes Software S.R.L. | |
| Axigen | Bucharest |
| Axionet | |
| AXOcomputers | Cluj |
| Axon Soft | |
| Axxess Capital | |
| ayb | |
| AZDownloads.com | Botoșani |
| AZV | |
| B.B.ROM Comexim S.r.l. | Bucharest |
| Babele | |
| Baboon | |
| Backend Technologies | |
| Backup4all | Cluj |
| Balcan-IX | Bucharest |
| Bam Media | |
| Banat IT | Timiș |
| Basmo | |
| BatchPhoto | Dolj |
| Beans United | |
| BEE CODED | |
| BeeByte Software Solutions | Bucharest |
| Beining & Bogen | |