| SYTOSS | |
| SZM.com | Bratislava |
| T-MAPY Slovensko, s.r.o. | Banská Bystrica |
| TABI Corp., s.r.o. | Trnava |
| Tangram SW, s.r.o. | Prešov |
| TapHome | |
| Tarantula, s.r.o. | Bratislava |
| TCNS, s.r.o. | Bratislava |
| TCP - Technology MAS, s.r.o. | |
| Team-SOFT, s.r.o. | |
| TECHBOX, s.r.o. | Bratislava |
| Technická Univerzita v Košiciach | Košice |
| Technická univerzita vo Zvolene | Banská Bystrica |
| Technoplus, spol. s r.o. | |
| TECHSOFT, s.r.o. | Prešov |
| TechStore.sk | Prešov |
| Tecton a.s. | Bratislava |
| TED Notepad | Bratislava |
| TEKRA.sk | Trnava |
| Telefónna | Nitra |
| TelTemp, spol. s r.o. | Bratislava |
| TEMPEST, a.s. | Bratislava |
| Ten Slovakia, s.r.o. | |
| TERAPO, spol. s r.o. | Banská Bystrica |
| Terminus, s.r.o. | Bratislava |
| Thinkitive | |
| Thinstuff, s.r.o. | Bratislava |
| Tiché PC | Košice |
| TINTA, s.r.o. | Trnava |
| TMachines, s.r.o. | Banská Bystrica |
| total.js | Banská Bystrica |
| Touch4IT | |
| TPsoft | Košice |
| Traco Computers | |
| TradeIn IT | |
| TramaTM, s.r.o. | |
| TransData, s.r.o. | |
| Translata, spol. s r.o. | |
| Trenčianska univerzita Alexandra Dubčeka v Trenčíne | Trenčín |
| Trend Media, s.r.o. | |
| Tricks | |
| Tridaz, s.r.o. | Bratislava |
| TRIGON Consulting, s.r.o. | |
| Trilobit Systems | Trenčín |
| Trimel, s.r.o. | |
| Trinit, s.r.o. | Nitra |
| TRIONYX technologies, s.r.o. | Banská Bystrica |
| Trnavská univerzita v Trnave | Trnava |
| TrustPay, a.s. | Bratislava |
| TRYNET, s.r.o. | |