| Tavion Limited | Construction | 2023 |
| Tavtaly Healthcare Limited | Health & social care | 2024 |
| Tawakkul Properties Limited | Real estate | 2020 |
| Tawnywood Developments Limited | Extraterritorial | 1997 |
| Tax Funding Limited | Financial services | 2003 |
| Tayberry Limited | Wholesale & retail | 1976 |
| Taylor Lettings & Properties Ltd | Real estate | 2021 |
| Taylor Templar Properties Limited | Real estate | 2026 |
| Taylor Utilities Ltd | Construction | 2023 |
| Taylor Wimpey Capital Developments Limited | Extraterritorial | 1988 |
| Taylor Wimpey Commercial Properties Limited | Extraterritorial | 1967 |
| Taylor Wimpey Developments Limited | Construction | 1959 |
| Taylor Wimpey Garage Nominees NO 1 Limited | Extraterritorial | 1973 |
| Taylor Wimpey Garage Nominees NO 2 Limited | Extraterritorial | 1993 |
| Taylor Wimpey Holdings Limited | Construction | 1945 |
| Taylor Wimpey International Limited | Extraterritorial | 1942 |
| Taylor Wimpey Pension Trustees Limited | Financial services | 2013 |
| Taylor Wimpey PLC | Professional & scientific | 1935 |
| Taylor Wimpey Property Company Limited | Extraterritorial | 1964 |
| Taylor Wimpey Property Management Limited | Extraterritorial | 1976 |
| Taylor Wimpey SH Capital Limited | Real estate | 2013 |
| Taylor Wimpey UK Limited | Construction | 1978 |
| Taylormade Automated Gates Limited | Manufacturing | 2019 |
| Taylormade Gates & Railings Limited | Manufacturing | 2018 |
| Taylors Transport (Shepperton) Ltd | Transport & logistics | 2003 |
| Tazzy Ltd | Wholesale & retail | 2021 |
| TBA Consultancy and Training Ltd | Professional & scientific | 2025 |
| Tbbcom Ltd | Wholesale & retail | 2024 |
| TBC NO 1 Limited | Hospitality | 2026 |
| Tbio Limited | Administrative & support | 2021 |
| Tbook UK Ltd | Information & communication | 2024 |
| TBS London Limited | Construction | 2008 |
| TC2 (Whitelands) Ltd | Households | 2024 |
| TCF Property Limited | Real estate | 2017 |
| TCS Auto Engineers Limited | Wholesale & retail | 2000 |
| TCS Housekeeping Ltd | Administrative & support | 2023 |
| Tcwbuild Ltd | Construction | 2025 |
| TD2K Limited | Information & communication | 2013 |
| TDI Heating Plumbing and GAS Engineer Ltd | Extraterritorial | 2022 |
| Tea by Blue Ltd | Hospitality | 2025 |
| Tea Media Ltd | Information & communication | 2020 |
| Teacup and Tandems Ltd | Hospitality | 2022 |
| Team Apexx Ltd | Education | 2023 |
| Teamcall Limited | Information & communication | 1996 |
| Teamstack Limited | Administrative & support | 2019 |
| Tearapy Limited | Manufacturing | 2020 |
| Tecbase Limited | Transport & logistics | 2012 |
| Tecform Limited | Professional & scientific | 2024 |
| Tech Contracts Online Ltd | Information & communication | 2023 |
| Tech Ninja Ltd | Information & communication | 2024 |
| Tech Re-Spec Ltd | Wholesale & retail | 2025 |
| Tech Security Limited | Administrative & support | 2025 |
| Tech Tronx Limited | Wholesale & retail | 2017 |
| Tech-Mech Solutions Limited | Professional & scientific | 2006 |
| Techaid Facilities Limited | Construction | 1973 |
| Techlabs Global Ltd | Information & communication | 2021 |
| Techlabs London Ltd | Information & communication | 2016 |
| Techmakan Ltd | Wholesale & retail | 2025 |
| Technetic Ltd | Information & communication | 2022 |
| Technetium Ltd | Information & communication | 2014 |
| Technical Management Systems Limited | Information & communication | 1992 |
| Technical Paper Solutions Ltd | Professional & scientific | 2016 |
| Technical Third EYE Ltd | Professional & scientific | 2021 |
| Technigrip Ltd | Information & communication | 2021 |
| Techno Dimensions Limited | Information & communication | 2007 |
| Techno Rubber Company (UK) Ltd | Wholesale & retail | 2024 |
| Techno Rubber Company Ltd | Wholesale & retail | 2024 |
| Technogile IT Ltd | Information & communication | 2023 |
| Technology Leasing Limited | Financial services | 2003 |
| Techone Services Limited | Information & communication | 2023 |
| Techsera Inc Ltd | Information & communication | 2023 |
| Techsol Ltd | Information & communication | 2020 |
| Techvelaro Consultancy Ltd | Information & communication | 2026 |
| Techworks Asia Limited | Professional & scientific | 2000 |
| TECS19 Ltd | Administrative & support | 2011 |
| Teen Spaces Ltd | Hospitality | 2025 |
| Tekbox IT Limited | Information & communication | 2014 |
| Tekton Roofing and Building Complete Property Solutions Ltd | Construction | 2023 |
| Telcosource Ltd | Wholesale & retail | 2020 |
| Telecom Help Service Limited | Extraterritorial | 2009 |
| Teleconnect Service Limited | Information & communication | 1994 |
| Telegenic Limited | Information & communication | 1981 |
| Telford Millennium Management Company Limited | Households | 2007 |
| Telford Residential Ltd | Real estate | 2025 |
| Telmead Limited | Households | 1987 |
| Tembo Cleaning Ltd | Administrative & support | 2025 |
| Tembure Healthcare Limited | Health & social care | 2013 |
| Temple Island Collections Limited | Wholesale & retail | 2004 |
| Temple Island Limited | Wholesale & retail | 1994 |
| Temple Place Film Limited | Information & communication | 2025 |
| Templetons Asset Management Ltd | Real estate | 2016 |
| Templetons Commercial Ltd | Real estate | 2020 |
| Templetons Financial Services Ltd | Financial services | 2014 |
| Templeway Limited | Real estate | 2002 |
| Temporary Staffing Agency TSA Limited | Administrative & support | 2018 |
| Temz Floating Saunas Ltd | Other services | 2025 |
| TEN Tower Ltd | Real estate | 2023 |
| Tenopt Limited | Real estate | 2018 |
| Tenth Avenue Consulting Ltd | Professional & scientific | 2019 |
| Teqfutures Ltd | Professional & scientific | 2022 |