| Toursolver | Hauts-de-Seine |
| toutapprendre.com | Paris |
| Trace One | Paris |
| Trace Software International | Seine-Maritime |
| Tracip S.A.S. | Meurthe-et-Moselle |
| TrackAd Group | |
| Trackap S.A.S. | |
| Trackoo | Gironde |
| Trackstone | |
| Tracktor | |
| Tracor Europe S.A.S. | Essonne |
| TRAD | |
| TradeIn | |
| Trait d'Union | |
| Tralalere | Paris |
| Tran Ha | Paris |
| Trans World Money | Bouches-du-Rhône |
| Transacts Communication | Paris |
| Transalley | |
| Transatel | Hauts-de-Seine |
| TransBar | Loire |
| Transcure Bioservices | |
| Transdata | Moselle |
| Transfert développement informatique | Métropole de Lyon |
| Transfert-fichier | Maine-et-Loire |
| Transgene S.A. | |
| Transplanet | Haute-Garonne |
| Transway | |
| Tranzition | |
| Traveldoo | Hauts-de-Seine |
| Traveljuice | |
| Travelsoft | Paris |
| Traxens | |
| TreeDIM | Hauts-de-Seine |
| TreeFrog | |
| Trees Telecom | Vaucluse |
| Trendeo | |
| Trenta | Loire |
| TRESO2 | |
| Tresorio | |
| TRI-EDRE | Var |
| Triagoz | Isère |
| Trialog | Paris |
| TRIAS Développement | |
| Tribalt | Alpes-Maritimes |
| Tribeca | |
| Tribofilm | Charente-Maritime |
| Tribord | Hauts-de-Seine |
| Tribun Health | |
| Triclic.com | Gironde |