| 10-Forward | West Flanders |
| 10tacle Studios Belgium | Hainaut |
| 123websites | East Flanders |
| 2 Bridge | |
| 2BY2 | Antwerp |
| 2icom | Hainaut |
| 2mpact | East Flanders |
| 2WAPPI engineering S.P.R.L. | |
| 3 Little Pix S.P.R.L. | |
| 3-it | |
| 3.life | |
| 3E | |
| 3sign | East Flanders |
| 4Clinics | |
| 4Dselect | Antwerp |
| 4Tissue | |
| 7 Sensing Software | |
| @iPower N.V. | Antwerp |
| A&C Systems N.V. | Flemish Brabant |
| A1 Services Bureautiques | Luxembourg |
| A6t - Concept sprl | Luxembourg |
| Aaltra | |
| AAlysse | Luxembourg |
| Abbove | |
| ABC Web B.V. | |
| ABIS | Flemish Brabant |
| Abitana N.V. | Flemish Brabant |
| AbitMORE B.V.B.A. | |
| ABO Service B.V. | West Flanders |
| Abscint | |
| AcademicLabs | |
| Acapela Group | Hainaut |
| Acapella | Brussels-Capital |
| ACB N.V. | East Flanders |
| Accelleran N.V. | |
| Access to Funding | |
| Accurat | |
| ACE Electronics N.V. | Flemish Brabant |
| Ace-IT cvoa | Flemish Brabant |
| Acronda | |
| acs-technics N.V. | East Flanders |
| Actia Telematics Services | Namur |
| Actonomy N.V. | East Flanders |
| Adafi N.V./S.A. | Flemish Brabant |
| Adam's Computer S.P.R.L. | Hainaut |
| ADC s.p.r.l. | Liège |
| AderA Software B.V.B.A. | Brussels-Capital |
| Adifo N.V. | East Flanders |
| ADIT Cloud Hosting | Antwerp |
| Adjust | |