| Techihouse UK Ltd | Wholesale & retail | 2015 |
| Techni-Grow Academy Ltd | Manufacturing | 2024 |
| Technical Safety Products Limited | Public administration | 2019 |
| Techno Consulting Limited | Information & communication | 2025 |
| Technocloud Infra Ltd | Information & communication | 2025 |
| Technology Consulting Services Limited | Information & communication | 2016 |
| Technology Security Solutions Limited | Information & communication | 2022 |
| Techpad Energy Ltd | Wholesale & retail | 2026 |
| Techpad International Limited | Administrative & support | 2023 |
| Techpad Marine Ltd | Manufacturing | 2023 |
| Techpave Group Ltd | Construction | 2025 |
| Teck Minerals Limited | Construction | 2015 |
| Teck Transport Ltd | Transport & logistics | 2021 |
| Teckpoint Limited | Wholesale & retail | 2015 |
| Tecmak Care Ltd | Health & social care | 2022 |
| Teda Trans Ltd | Administrative & support | 2022 |
| Tedd-Trans Ltd | Transport & logistics | 2021 |
| Tedder Avenue (Henlow) Residents Company Limited | Households | 2021 |
| Teddy Bears Inn Day Nursery Ltd | Administrative & support | 2016 |
| Teddy FOX Brewery Ltd | Manufacturing | 2023 |
| Tedmar Ltd | Administrative & support | 2017 |
| Tee's Bridal Bliss Limited | Health & social care | 2014 |
| Tee-Kay Holdings Limited | Manufacturing | 1985 |
| Tee-Kay Packaging (Peterborough) Limited | Manufacturing | 1982 |
| Teebie Limited | Professional & scientific | 2023 |
| Teefee Ltd | Hospitality | 2022 |
| Teemo Designs Limited | Manufacturing | 1980 |
| Teevee Ltd | Health & social care | 2025 |
| TEF Property Ltd | Households | 2024 |
| TEG (Stamford) Ltd | Real estate | 2026 |
| Teharo Ltd | Manufacturing | 2022 |
| Tehya Patel Homes Ltd | Extraterritorial | 2024 |
| TEK Construction Ltd | Construction | 2017 |
| TEK Junkie Limited | Wholesale & retail | 2025 |
| Teka Flooring Ltd | Construction | 2020 |
| Teka Group Limited | Professional & scientific | 2012 |
| Teka Services Limited | Construction | 2017 |
| Teklogic Ltd | Information & communication | 2022 |
| Teknoflair Limited | Wholesale & retail | 2024 |
| Teko Solution Ltd | Wholesale & retail | 2025 |
| Teksfera Mechanical and Engineering Trading UK Ltd | Wholesale & retail | 2021 |
| Tekuest Limited | Wholesale & retail | 2017 |
| Tekvora Ltd | Information & communication | 2026 |
| Tela Associates Limited | Professional & scientific | 2016 |
| Telecom Supply Line Limited | Wholesale & retail | 1990 |
| Telecomduty Ltd | Construction | 2021 |
| Telephone Helplines Services Limited | Professional & scientific | 2000 |
| Telic Motors Limited | Wholesale & retail | 2025 |
| Telka Healthcare Limited | Health & social care | 2023 |
| Telsie Property Ltd | Real estate | 2022 |
| Temida Help 4 U Ltd | Professional & scientific | 2017 |
| Temida Lettings Ltd | Real estate | 2017 |
| Tempe Medicare Ltd | Health & social care | 2021 |
| Temperature Solutions (UK) Ltd | Manufacturing | 2011 |
| Templar House (UK) Limited | Wholesale & retail | 2004 |
| Templeton Property Management Limited | Administrative & support | 2016 |
| Templewood (High Wycombe) Residents Company Limited | Households | 2002 |
| Temptation Coffee Shop Ltd | Hospitality | 2022 |
| Temptation Taste of Portugal Ltd | Hospitality | 2017 |
| Temptationsuk Ltd | Health & social care | 2026 |
| TEN 10 Diner Ltd | Hospitality | 2024 |
| TEN Hairdressing (Stilton) Ltd | Other services | 2017 |
| TEN Plus Ltd | Transport & logistics | 2024 |
| Tenant Find Ltd | Households | 2013 |
| Tendigo Consulting Ltd | Information & communication | 2018 |
| Tenx People Ltd | Administrative & support | 2019 |
| Teomar Trans Ltd | Transport & logistics | 2015 |
| Teopopescu Transport Ltd | Transport & logistics | 2014 |
| Teqhou Ltd | Information & communication | 2010 |
| TER Catering Ltd | Hospitality | 2024 |
| Teraz My Accounts Since 2007 Ltd | Professional & scientific | 2015 |
| Termac Limited | Transport & logistics | 2023 |
| Terpan Limited | | 1963 |
| Terra Metal UK Limited | Wholesale & retail | 2024 |
| Terra United Ltd | Transport & logistics | 2025 |
| Terracart Limited | Wholesale & retail | 2020 |
| Terrahive Limited | Real estate | 2020 |
| Terraindigo Ltd | Information & communication | 2014 |
| Terralift UK Limited | Wholesale & retail | 1991 |
| Terratetrix Group Ltd | Real estate | 2025 |
| Terrawerx Ltd | Real estate | 2019 |
| Terrell Kilpatrick RE Ltd | Real estate | 2024 |
| Terrells LLP | | 2005 |
| Terrington Convenience Stores Ltd | Wholesale & retail | 2022 |
| Terry Austin Photography Trading AS the Studio Ltd | Professional & scientific | 2017 |
| TES Independent Social Work Limited | Health & social care | 2013 |
| TES Security Services Ltd | Administrative & support | 2024 |
| Tessella Enterprises Ltd | Wholesale & retail | 2025 |
| Tessellate OS Ltd | Administrative & support | 2015 |
| Test Labs Limited | Professional & scientific | 2021 |
| Testa Della Corsa Limited | Information & communication | 2023 |
| Tested Distribution Ltd | Wholesale & retail | 2024 |
| Testeka Ltd | Transport & logistics | 2018 |
| Tevaco Ltd | Wholesale & retail | 2025 |
| Teversham Indian Curry Ltd | Hospitality | 2026 |
| Texas Dental Ltd | Health & social care | 2022 |
| Textbook Travel Limited | Education | 2013 |
| Tezot Limited | Health & social care | 2025 |
| TF Heating & Plumbing Ltd | Construction | 2018 |
| Tfenergyhome Ltd | Information & communication | 2018 |