| Timbco (UK) Limited | Wholesale & retail | 2000 |
| Timberholme Properties Limited | Households | 1985 |
| Timbertech CNC Limited | Manufacturing | 2024 |
| Timbertech Creations Ltd | Construction | 2020 |
| Timcraft Limited | Information & communication | 2022 |
| Time 35 Limited | Hospitality | 2024 |
| Time OUT Cafe Bar Ltd | Hospitality | 2026 |
| Time Research & Innovation Ltd | Professional & scientific | 2019 |
| Time to Relax Furniture Limited | Manufacturing | 2010 |
| Time Well Spent Group Limited | Information & communication | 2016 |
| Time Well Spent Projects Limited | Information & communication | 2022 |
| Timeless Sashes Limited | Construction | 2015 |
| Timeless Transits Worldwide Ltd | Transport & logistics | 2024 |
| Timeline Interface Solutions Ltd | Professional & scientific | 2017 |
| Timepiece Investing Ltd | Wholesale & retail | 2026 |
| Timerni Sourcing Ltd | Wholesale & retail | 2024 |
| Times International Trade Limited | Wholesale & retail | 2024 |
| Timesaverz Limited | Administrative & support | 2025 |
| Timik Agricultural Limited | Manufacturing | 1976 |
| Timkas Ltd | Health & social care | 2022 |
| Timmy's Kitchen Ltd | Hospitality | 2025 |
| Timotei Construction Ltd | Construction | 2018 |
| Timply Limited | Information & communication | 2025 |
| Tinajay Care Ltd | Health & social care | 2014 |
| Tinaristech Limited | Information & communication | 2010 |
| Tingli Limited | Wholesale & retail | 2010 |
| Tinkerbell Healthcare Limited | Wholesale & retail | 2023 |
| Tinkerbell Home Care Limited | Health & social care | 2026 |
| Tinom Private Limited | Administrative & support | 2019 |
| Tins of Art Paintshop Ltd | Wholesale & retail | 2019 |
| Tiny Cloud Ltd | Information & communication | 2018 |
| Tiny Developments Ltd | Construction | 2025 |
| Tiny Toes (Southampton) Ltd | Health & social care | 2015 |
| Tiny Treats Ltd | Hospitality | 2026 |
| Tiny Zodiacs Ltd | Wholesale & retail | 2026 |
| TIP Top Plumbing Heating and GAS Services Ltd | Construction | 2024 |
| Tirex Imports Ltd | Other services | 2023 |
| Tirziman Trans Limited | Transport & logistics | 2021 |
| Tisco Foods Ltd | Wholesale & retail | 2024 |
| Tisza Trans Ltd | Transport & logistics | 2025 |
| Titan Carpentry Limited | Construction | 2021 |
| Titan Fire Services Limited | Public administration | 2012 |
| Titan UK Construction Ltd | Manufacturing | 2025 |
| Titanic Spa Limited | Hospitality | 2017 |
| Titanic Tattoos (South) Limited | Other services | 2021 |
| Titanium Developments Ltd | Construction | 2019 |
| Titchfield Festival Theatre Limited | Arts & recreation | 2012 |
| Titchfield Tree Services Limited | Other services | 2014 |
| Titchfield Youth Theatre Community Interest Company | Arts & recreation | 2016 |
| Tiwan Tiwa Edibles Limited | Manufacturing | 2024 |
| TJ Heart Limited | Administrative & support | 2016 |
| TJ Solution Management Ltd | Real estate | 2023 |
| TJ Studio Ltd | Professional & scientific | 2014 |
| TJ Whippy Limited | Hospitality | 2025 |
| Tjehanga Day Care Ltd | Health & social care | 2024 |
| TJM Solutions Ltd | Construction | 2025 |
| TJP Business Services Limited | Professional & scientific | 2023 |
| TJP Carpentry Limited | Manufacturing | 2025 |
| TJP Mobility Ltd | Arts & recreation | 2024 |
| Tjsl Property Ltd | Administrative & support | 2023 |
| TJT Solutions Ltd | Administrative & support | 2011 |
| TL Cuts Studios Limited | Other services | 2022 |
| TL24TCG Ltd | Wholesale & retail | 2025 |
| TLC ADS Ltd | Professional & scientific | 2013 |
| Tlcw (Ealing) Limited | Wholesale & retail | 2021 |
| Tlcw (Hammersmith) Limited | Wholesale & retail | 2015 |
| Tlcw (Holdings) Limited | Financial services | 2015 |
| Tlcw (Sheen) Limited | Wholesale & retail | 2019 |
| Tlcw (ST John's Hill) Limited | Wholesale & retail | 2015 |
| Tlcw Limited | Extraterritorial | 2011 |
| TLD Project Coaching Ltd | Professional & scientific | 2026 |
| TLF Building & Maintenance Ltd | Construction | 2022 |
| Tlfr Panjab Transport Ltd | Transport & logistics | 2022 |
| TM Cloud Ltd | Professional & scientific | 2024 |
| TM Driveways & Patios Ltd | Administrative & support | 2025 |
| TM Kiro Consulting Ltd. | Health & social care | 2003 |
| TM Landscapes & Construction Ltd | Construction | 2020 |
| TM South Ltd | Professional & scientific | 2023 |
| Tm-Financials Limited | Professional & scientific | 2020 |
| TMA Electrical Ltd | Manufacturing | 2011 |
| TMA South Coast Limited | Education | 2022 |
| TMB Day Nurseries Limited | Education | 2012 |
| Tmbc Homes Ltd | Real estate | 2022 |
| TMC Spice Ltd | Hospitality | 2025 |
| TMD Maintenance and Services Ltd | Construction | 2020 |
| TMG Soton Ltd | Administrative & support | 2025 |
| TMJ Solutions Ltd | Transport & logistics | 2018 |
| Tmjw Enterprises Limited | Construction | 2024 |
| TMR Homes Limited | Real estate | 2025 |
| Tmrp Properties Limited | Real estate | 2019 |
| Tmrv Taxation Ltd | Professional & scientific | 2013 |
| TMS 4 Motion LLP | | 2025 |
| TMT (Transmanche Technologie) Vector Eeig | | 1991 |
| TMT Legal Services LLP | | 2019 |
| TN Gym Equipment Limited | Wholesale & retail | 2025 |
| TNG Consulting Engineers Limited | Professional & scientific | 2000 |
| TNV Nails and Beauty Ltd | Other services | 2024 |
| TO BEE Social Ltd | Professional & scientific | 2020 |
| Toader Transport Ltd | Transport & logistics | 2022 |
| Toakan Network Ltd | Manufacturing | 2026 |