| T3cnologic | Madrid |
| Taclia | Barcelona |
| Taemsa | Tarragona |
| Taiko Solutions | Madrid |
| Tailor Hub | |
| Talem | Madrid |
| TalentFY Recruiting, S.L. | Barcelona |
| TalentMOBILE, S.L. | Madrid |
| Talk-Q | Pontevedra |
| Taller de Projectes Digitals | Barcelona |
| Tancra Systems, S.L. | Barcelona |
| Tangelo Games | Barcelona |
| Tangram Solutions, S.L. | Madrid |
| Tanta Tecnología y Comunicación | Madrid |
| Taptap | Madrid |
| TAPTAP Digital | Madrid |
| Tarlogic | |
| Tarsis.net | Madrid |
| Tarsoman | Sevilla |
| Tb Media Consulting | Madrid |
| TBB Agency | Barcelona |
| TBS Education Barcelona | |
| TCX Micro | Barcelona |
| TD Intelligent | Madrid |
| TDT Electronica | Valencia |
| Teamnet, S.L. | Madrid |
| Tecatel | Valencia |
| Tecci Circuitos Impresos, S.A. | Gipuzkoa |
| Tech Barcelona | Barcelona |
| Tech Tourism Cluster | Barcelona |
| TechHerox | Madrid |
| Techni-web | Girona |
| Technodac | Tarragona |
| Technologic Road, S.L. | Murcia |
| TechRules | Madrid |
| Tecnalia | |
| Tecnicas del Cable | La Rioja |
| Técnicas Profesionales | Barcelona |
| TecnicasMarketing.com | Madrid |
| TécnicoPC.info | A Coruña |
| Tecnifip | Sevilla |
| Tecnimart, S.L. | Madrid |
| Tecnimática, S.L. | Madrid |
| Tecnisoft | Cádiz |
| Tecnisoft Data & Services | Madrid |
| Tecnitest Ingenieros | Madrid |
| Tecno Antena Sistemas | Madrid |
| Tecno Sistemas de CADCAM, S.L. | Biscay |
| TecnoAd | Tarragona |
| TecnoCampus | Barcelona |