| Telecom Service Groep | Groningen |
| Telecom Services | North Holland |
| TeleCom Update | North Holland |
| Telecom.Paper B.V. | Utrecht |
| TeleCombine | South Holland |
| Telecomhuis.nl | |
| Telecommagazine | South Holland |
| Teledata Networks | |
| Teledump | North Holland |
| Telefuture | South Holland |
| Telemos ICT Solutions Group | Utrecht |
| Telerex Nederland B.V. | North Brabant |
| Teleservice Nederland B.V. | South Holland |
| Tellick B.V. | |
| Tellick B.V. | |
| Telpa Telecom | Friesland |
| Telpress International B.V. | South Holland |
| Temco Computers B.V. | North Brabant |
| Temo Internetservices | Gelderland |
| TendenZ B.V. | Drenthe |
| Tenner B.V. | |
| TenneT TSO B.V. | |
| Tensing | Gelderland |
| TenWise B.V. | |
| Teqplay B.V. | |
| Terra-IT Webdesign | Utrecht |
| TerraByte Internet Services | North Brabant |
| TES Installatietechniek Tilburg B.V. | North Brabant |
| TessellateBIO B.V. | |
| Testcapture | South Holland |
| TestGorilla | North Holland |
| TestMonitor | South Holland |
| TeTech | Utrecht |
| Textinfo Technologies | Gelderland |
| Textkernel B.V. | North Holland |
| Textmetrics | Gelderland |
| Texyz Indexing Software | Utrecht |
| That's IT | South Holland |
| The Academy | North Brabant |
| The Broker Site B.V. | North Brabant |
| The Cirqle | North Holland |
| The Close App | North Holland |
| The Courseware Company | Utrecht |
| The Customer Experience Agency | |
| The Hague Security Delta | South Holland |
| The Hatch Firm | North Holland |
| The HTML5 Test | Friesland |
| The Lift Data Company | |
| The Marketing Shop | North Holland |
| The New Base | North Holland |