| Juliana | Morbihan |
| Julie Solutions | Seine-et-Marne |
| Julien Clément | Métropole de Lyon |
| Julius Network Solutions | Paris |
| JUNIA | |
| Junior-Entreprise de l’ISEP | Paris |
| Just for Games | |
| Just Search France | Paris |
| JustBio | Paris |
| Juvisé Pharmaceuticals | |
| Jview Immobilier | Haut-Rhin |
| Jvweb | Hérault |
| K Digital | |
| K Électronique et Technologie | Seine-et-Marne |
| K-All | Paris |
| K-techno | Vendée |
| K-Web | Métropole de Lyon |
| Kabia S.A.R.L. | |
| Kabiloo | Sarthe |
| Kabolt | |
| Kacrea | Paris |
| KADIK2i.com | Paris |
| Kaduceo | |
| Kagency | Loire-Atlantique |
| Kaholia | |
| KAIO | Nord |
| Kairntech | |
| Kairos | Yvelines |
| Kaizen Agency | Gironde |
| Kalanda | Bouches-du-Rhône |
| KALANE Consulting | Paris |
| Kalélia | Loire-Atlantique |
| Kalhyge | |
| Kalimetrix | Haute-Garonne |
| Kaliop | |
| Kaliop S.A.S. | Paris |
| KaliTech | Essonne |
| Kaliti | |
| Kalitys Multimédia | Métropole de Lyon |
| Kalray Corporation | Essonne |
| Kalsiom | |
| KALYZ | Haute-Savoie |
| Kamaé | |
| Kameleoon | |
| Kamet | Paris |
| Kamitec Informatique | Seine-et-Marne |
| Kamix | |
| Kanasas | Var |
| Kanbios | |
| KandorLab | |