| 2si.fr | Aisne |
| 3-D Matrix Medical Technology | |
| 36 Pixels | |
| 360 Capital Partners | Paris |
| 360 WEBMARKETING | Paris |
| 360&1 | |
| 360° CLIENT | |
| 361 SEO | |
| 365Talents | Métropole de Lyon |
| 3A Engineering | Aveyron |
| 3aCRM | Pas-de-Calais |
| 3C Concept S.A.S. | Côte-d'Or |
| 3C-Evolution | Isère |
| 3Ci Solutions | Seine-et-Marne |
| 3clics | Nord |
| 3D Émotion | Rhône |
| 3D Plus S.A. | |
| 3D Storm | Gironde |
| 3Dsoft | Seine-Saint-Denis |
| 3DVF | |
| 3E informatique services S.A.R.L. | Gironde |
| 3GPP | Alpes-Maritimes |
| 3ie | Val-de-Marne |
| 3ie - Institut d'Innovation Informatique de l'EPITA | |
| 3iL Ingénieurs | |
| 3iS Éducation | |
| 3IT Diffusion | Ardèche |
| 3Liz | Hérault |
| 3ma Group | Haut-Rhin |
| 3Mi Web | Gironde |
| 3Pi | Paris |
| 3s marketing | Bouches-du-Rhône |
| 3W Academy | Paris |
| 3xo | Paris |
| 410 Gone | Métropole de Lyon |
| 42 | Paris |
| 42c | |
| 4D S.A.S. | Yvelines |
| 4Data.fr | |
| 4G Technology | Alpes-Maritimes |
| 4gency | |
| 4Moving Biotech | |
| 4P-Pharma | |
| 4Runners | |
| 4SH | |
| 4w.fr | Oise |
| 50 Partners | Paris |
| 50A | |
| 50inTech | |
| 5COM | Paris |