| Blue One Management S.A./N.V. | |
| blue2purple | Brussels-Capital |
| Bluefive software | Antwerp |
| Bmgroup | Antwerp |
| bNamed.net | Antwerp |
| Board of Innovation | Antwerp |
| Boobook | |
| Boondoggle | Flemish Brabant |
| BoulevArt N.V. | Antwerp |
| bpost banque | |
| Brainbridge B.V.B.A. | Antwerp |
| Brainpoint | Flemish Brabant |
| Brainstorming | Liège |
| BrainWin | Flemish Brabant |
| Bricsys N.V. | |
| Bright Analytics B.V. | West Flanders |
| BrightSoft | West Flanders |
| Brother International (Belgium) N.V. | Flemish Brabant |
| BruCON | Flemish Brabant |
| Brussels Innova | Brussels-Capital |
| Brussels Life Science Incubator | |
| Bruxelles Linux User Group | Brussels-Capital |
| Bside | Hainaut |
| Bsit | |
| Bucoweb | Luxembourg |
| Bugtracker | |
| BuildSoft | |
| Business Angels Region Stuttgart e.V. | |
| BuyIn | |
| Byteflies | |
| C&C Computers & Communications | East Flanders |
| C-MAC Holding N.V. | East Flanders |
| C-Smart | |
| C.A. Dire | Walloon Brabant |
| Cactus, LLC | |
| Caiman CVBA | East Flanders |
| Canon Belgium N.V./S.A. | Flemish Brabant |
| Canon Business Center Brussels | Flemish Brabant |
| Capdirect | Hainaut |
| Capflow | Hainaut |
| Capricorn Partners | |
| Carflow | |
| Carta+ | |
| Cartronics | Walloon Brabant |
| CAS B.V.B.A. | Limburg |
| Cashplannr | |
| Cassiopea A.S.B.L. | Brussels-Capital |
| Cats Communication | |
| Cats&Dogs | Limburg |
| CBM Informatique | |