| ISC-DISTREL S.A. | Val-d'Oise |
| ISCA | Bas-Rhin |
| ISCID-CO | |
| ISCIO | |
| ISCO | Paris |
| ISCOM | |
| IsCool Entertainment | Paris |
| ISE Systems | |
| ISEC | Paris |
| ISEGCOM | |
| ISEM | Gironde |
| ISEN | Finistère |
| ISEN Brest | |
| ISEN Méditerranée | |
| ISEN Nantes | |
| ISEN Rennes | |
| Isens Evolution | Haute-Garonne |
| ISEP, École d'ingénieurs du numérique | Paris |
| ISI Création | Oise |
| ISI-COM | Indre-et-Loire |
| Isiconcept | Doubs |
| Isics | Ardennes |
| ISIMA | Puy-de-Dôme |
| Isimedia S.A.S. | Paris |
| ISIPCA | |
| IsiProd | Haute-Savoie |
| ISIT | Haute-Garonne |
| Isitec International | Métropole de Lyon |
| ISL Institut franco-allemand de recherches de Saint-Louis | |
| ISLEAN | |
| ISNPRO | Val-de-Marne |
| Isociel | Haute-Garonne |
| ISoft | Essonne |
| iSoluce | |
| ISORG | Isère |
| Isotope Energy | |
| iSource Gestion | Paris |
| iSphere Group | Essonne |
| iSquareCube S.A.S. | |
| ISR | Métropole de Lyon |
| IsraelValley | Paris |
| ISTEC | |
| iStreams Technology France | Alpes-Maritimes |
| Isurf'media | Bouches-du-Rhône |
| ISVTEC S.A.R.L. | Paris |
| IT Angels | |
| IT Industrie & Technologies | Hauts-de-Seine |
| IT Link | |
| IT News Info | Paris |
| IT Services S.A.R.L. | Haut-Rhin |