| JvSoft | |
| Kabelwerk Eupen AG | Liège |
| KangaCoders | |
| Kangaroot | Antwerp |
| Kantify | |
| Kappa Data Group | |
| Karel de Grote Hogeschool | |
| Kaspard | |
| Keep IT Running | Limburg |
| Kenetix B.V.B.A. | |
| KERN-IT | |
| Keyrock | |
| Keyrock | |
| KeyTech | |
| Keyware | Flemish Brabant |
| Keyware Technologies N.V. | |
| Kharis Capital | |
| Kim Communication | Walloon Brabant |
| Kinamo S.A. | Antwerp |
| KiOmed Pharma | |
| Kitencre | Brussels-Capital |
| Kitry | Walloon Brabant |
| KMOSites B.V. | East Flanders |
| KNEET | |
| KNX Association | Brussels-Capital |
| Konekt S.P.R.L. | Brussels-Capital |
| Koninklijke Vlaamse Academie van België | |
| Korazon | West Flanders |
| KPD Services N.V. | Limburg |
| Kpler | |
| Kresoft Systems | East Flanders |
| KSL | Namur |
| KU Leuven | Flemish Brabant |
| KU Leuven - Computer Security and Industrial Cryptography group | Flemish Brabant |
| KU Leuven - Department Computerwetenschappen | Flemish Brabant |
| KU Leuven - Department Elektrotechniek | Flemish Brabant |
| KU Leuven - Department of Mathematics | Flemish Brabant |
| KU Leuven - Hoger Instituut voor Wijsbegeerte | Flemish Brabant |
| KYOCERA Document Solutions Belgium N.V. | Flemish Brabant |
| Lab Box | |
| Lab9 Stores B.V.B.A. | East Flanders |
| Laboratoires SMB S.A. | |
| Laboratory of Computational Biology | |
| LaCAR MDx | |
| Lambda-X Verhaert High-Tech | |
| Lancr | |
| Landschoot.be | East Flanders |
| Lansweeper | East Flanders |
| Laptop-Shop.be | East Flanders |
| Lason Media | East Flanders |