| Techne Group Ltd | Administrative & support | 2021 |
| Technicaine Limited | Administrative & support | 2007 |
| Technical Comms Limited | Information & communication | 2013 |
| Technical Display Systems Limited | Administrative & support | 1996 |
| Technical Engineering Drawing Services Ltd | Administrative & support | 2019 |
| Technical Machinery Assessment Services Ltd | Professional & scientific | 2022 |
| Technologee Solutions Ltd | Information & communication | 2024 |
| Technology Consulting Finance Limited | Financial services | 2006 |
| Technology Strategy Consulting Group Ltd | Information & communication | 2012 |
| Technology Supplies Flamefast Ltd | Manufacturing | 2020 |
| Technology Supplies Limited | Manufacturing | 2020 |
| Technovedge Ltd | Information & communication | 2020 |
| Techplas (Precision Engineering) Limited | Manufacturing | 2014 |
| Techsel Ltd | Wholesale & retail | 2020 |
| Techsiteco Ltd | Wholesale & retail | 2023 |
| Techstack Solutions Limited | Information & communication | 2016 |
| Techweld Qa/Qc Limited | Administrative & support | 2026 |
| Tecker Limited | Construction | 1988 |
| Tecknowles Limited | Administrative & support | 2016 |
| Tecnobit Ltd | Administrative & support | 2007 |
| Tecpoint Ltd | Real estate | 2015 |
| Tectrix Solutions Part Four Limited | Information & communication | 2000 |
| Tecxperia Ltd | Information & communication | 2025 |
| TED Flower Limited | Administrative & support | 2007 |
| TED Todd & Sons (England) Limited | Professional & scientific | 2005 |
| Ted.It Consulting Ltd | Information & communication | 2026 |
| Teddysoft Services Ltd | Information & communication | 2019 |
| Teemediaa Ltd | Professional & scientific | 2026 |
| Teemsell Ltd | Wholesale & retail | 2022 |
| Teeze Ltd | Wholesale & retail | 2019 |
| Tefluk Ltd | Education | 2012 |
| TEI Electrical Contractors Ltd | Construction | 2024 |
| Teignbridge Tuition & Education Limited | Education | 2026 |
| TEK Software Solutions Ltd | Information & communication | 2023 |
| Tekniska Limited | Professional & scientific | 2017 |
| Teknisolar Ltd | Professional & scientific | 2004 |
| Teknotronik Limited | Other services | 2018 |
| Teknowlegis Ltd | Information & communication | 2023 |
| Tektest Limited | Administrative & support | 2012 |
| Telecom Pro Solutions Limited | Information & communication | 2019 |
| Telecom Rentals (UK) Ltd | Administrative & support | 2017 |
| Telenergy Limited | Extraterritorial | 2022 |
| Telewebb Limited | Information & communication | 2016 |
| Telford Frozen Foods Ltd | Wholesale & retail | 2012 |
| Telling Lime Limited | Wholesale & retail | 2017 |
| Tels-Insignia Limited | Wholesale & retail | 2013 |
| Telstar Apps Ltd | Extraterritorial | 2019 |
| Telstar Hits Internet Radio Ltd | Information & communication | 2019 |
| Telstar Hits Radio Ltd | Information & communication | 2019 |
| Telstar Internet Radio Ltd | Information & communication | 2019 |
| Telstar Media & Communications Ltd | Extraterritorial | 2019 |
| Telstar Movie Casino Limited | Extraterritorial | 2020 |
| Telstar Music TV Ltd | Information & communication | 2019 |
| Telstar Radio Ltd | Information & communication | 2019 |
| Telstar Records Limited | Professional & scientific | 2009 |
| Telstar Shopping TV Limited | Extraterritorial | 2020 |
| Telstar TV Ltd | Information & communication | 2019 |
| Telve Dream Ltd | Hospitality | 2025 |
| TEM Thai Chilli Ltd | Hospitality | 2024 |
| Temi Enterprises Ltd | Hospitality | 2025 |
| Tempcontrol Limited | Information & communication | 2026 |
| Temperature Controlled Distribution Ltd | Transport & logistics | 2018 |
| Tempus Construction Limited | Construction | 2015 |
| TEN Directions Food Limited | Hospitality | 2024 |
| Tenace Limited | Administrative & support | 2025 |
| Tenet Consultants Limited | Professional & scientific | 2005 |
| Tenfour Media Ltd | Information & communication | 2025 |
| Tenner Deal Limited | Other services | 2026 |
| Tennis Aces Limited | Education | 2009 |
| Tenpoundprints Ltd | Wholesale & retail | 2025 |
| Tenpro Network Cabling Limited | Construction | 1999 |
| Tenten Limited | Real estate | 2012 |
| Tenth House Consulting Limited | Administrative & support | 2016 |
| Tenzy Limited | Wholesale & retail | 2003 |
| Teraxus Ltd | Construction | 2026 |
| Terence D. Anderson Estimating Services Ltd | Administrative & support | 2026 |
| Teresmique Limited | Information & communication | 2016 |
| TERRAHAWK95 Limited | Professional & scientific | 2023 |
| Terraprocure Ltd | Professional & scientific | 2026 |
| Terrene Technology Limited | Administrative & support | 2013 |
| Terron Construction Ltd | Construction | 2018 |
| TES Group Holdings Limited | Construction | 2021 |
| Test Automation Labs Limited | Professional & scientific | 2017 |
| Test Staff Ltd | Professional & scientific | 2018 |
| Testa-Rossa Leisure Group Ltd | Wholesale & retail | 2001 |
| Testing 24-7 Limited | Information & communication | 2019 |
| Tetdjim Engineering Limited | Construction | 2010 |
| Teunis Digital Limited | Professional & scientific | 2025 |
| Texet Instruments Limited | Wholesale & retail | 2022 |
| Tezgel Ltd | Wholesale & retail | 2021 |
| TF Chippy Limited | Hospitality | 2024 |
| TFE Installations Ltd | Construction | 2025 |
| TFF Property Services Ltd | Real estate | 2021 |
| TFL Transport Ltd | Transport & logistics | 2025 |
| TFN Consultancy Services Ltd | Professional & scientific | 2023 |
| TFX Limited | Wholesale & retail | 2025 |
| TGB Integrated Solutions Ltd | Construction | 2026 |
| TGC Emerald Limited | Energy | 2015 |
| Tggb Controls Limited | Administrative & support | 2025 |
| TGJ Engineering Solutions Ltd | Administrative & support | 2025 |