| Tonvy Ltd | Construction | 2025 |
| Tony Kempster Limited | Professional & scientific | 2006 |
| Tony's School of Motoring Ltd | Education | 2024 |
| Toolsie's Transport Ltd | Transport & logistics | 2026 |
| Toor Construction Private Ltd | Construction | 2025 |
| Top Gear (GB) Ltd | Professional & scientific | 2006 |
| Top Lane Chauffeurs Limited | Transport & logistics | 2024 |
| Top Living Limited | Real estate | 2017 |
| Top Notch Chauffeurs Ltd | Transport & logistics | 2024 |
| Top Quality Catering Ltd | Hospitality | 2025 |
| Top Rack Ltd | Wholesale & retail | 2025 |
| Top Run Consultancy Ltd | Professional & scientific | 2024 |
| Top Run Resourcing Ltd | Administrative & support | 2022 |
| Top Turkish Barbers Skegness Ltd | Other services | 2025 |
| Top Vision Solutions Limited | Transport & logistics | 2023 |
| Topboffin Ltd | Information & communication | 2020 |
| Topbus Ltd | Transport & logistics | 2020 |
| Topcat Consulting Limited | Information & communication | 2012 |
| Topcat Properties Ltd | Real estate | 2022 |
| Topeventsuk Ltd | Hospitality | 2024 |
| Topgear Hounslow Limited | Transport & logistics | 2014 |
| Topher Trading Ltd | Arts & recreation | 2022 |
| Topit-Uk Ltd | Construction | 2016 |
| Topnotch Mediauk Ltd | Professional & scientific | 2021 |
| Topnotch Studios Ltd | Information & communication | 2026 |
| Topnotch Studiosuk Ltd | Information & communication | 2020 |
| Tops Glazing Ltd | Construction | 2019 |
| TOPSHOP6 Ltd | Wholesale & retail | 2025 |
| Toren Navo Aansluiting Ltd | Real estate | 2013 |
| Torquay Jewellery Limited | Wholesale & retail | 2023 |
| Torque and Steam Ltd | Arts & recreation | 2021 |
| Toshakhana-I-Azaadi CIC | Health & social care | 2024 |
| Total BS Ltd | Administrative & support | 2018 |
| Total Care Supplies Ltd | Wholesale & retail | 2025 |
| Total Cover Limited | Construction | 1997 |
| Total Data Warehouse Solutions UK Ltd | Information & communication | 2012 |
| Total EAR Care Limited | Health & social care | 2009 |
| Total Heat Services Ltd | Construction | 2022 |
| Total Inner Game Limited | Information & communication | 2014 |
| Total Synergy UK Limited | Information & communication | 2011 |
| Total Wiring Limited | Extraterritorial | 2016 |
| TOTOCYCLEWORLD1 Limited | Wholesale & retail | 2012 |
| Touch of Gold London Ltd | Wholesale & retail | 2026 |
| Touching Sky 2023 Ltd | Wholesale & retail | 2023 |
| Tough Build Ltd | Construction | 2026 |
| Tough Glove Limited | Manufacturing | 2020 |
| Tourabs Limited | Information & communication | 2016 |
| Tourwriter UK Limited | Information & communication | 2024 |
| TOW Compare Ltd | Transport & logistics | 2026 |
| Tower Logistics Limited | Transport & logistics | 2019 |
| Tower Mansions Limited | Real estate | 2006 |
| Tower One Estate Ltd | Real estate | 2025 |
| Towerpros, Ltd | Construction | 2014 |
| Toyota Material Handling UK Limited | Wholesale & retail | 1961 |
| Toyota Material Handling UK Rental Limited | Administrative & support | 1976 |
| TPG Solutions Ltd | Construction | 2024 |
| TPM Medical Limited | Health & social care | 2026 |
| Tpms Group Limited | Administrative & support | 2020 |
| TR Aviation & Hobbies Ltd | Wholesale & retail | 2018 |
| TR Law Limited | Professional & scientific | 2024 |
| TR Removals and Logistics Limited | Transport & logistics | 2026 |
| TR Removals Ltd | Wholesale & retail | 2025 |
| Trace Media Limited | Information & communication | 2025 |
| Trackaroo Ltd | Transport & logistics | 2025 |
| Trackersack Technologies Limited | Information & communication | 2018 |
| Trackglobal Logistics Limited | Transport & logistics | 2025 |
| Trackstart UK Limited | Arts & recreation | 2022 |
| Tracktrail Ltd | Professional & scientific | 2025 |
| Trade Academics Ltd | Education | 2010 |
| Trade Hall Holdings Ltd | Real estate | 2023 |
| Trade Hatch Ltd | Wholesale & retail | 2025 |
| Trade Master Int'L Ltd | Wholesale & retail | 2010 |
| TRADE7 Limited | Wholesale & retail | 2022 |
| Tradedist Ltd | Wholesale & retail | 2023 |
| Tradeneo Ltd | Wholesale & retail | 2025 |
| Tradenovi Limited | Wholesale & retail | 2024 |
| Tradesmen Hub Ltd | Construction | 2011 |
| Tradex Ventures Ltd | Other services | 2024 |
| Trading HMQ Ltd | Wholesale & retail | 2025 |
| Trading MP Ltd | Wholesale & retail | 2025 |
| Trading Simplified Ltd | Wholesale & retail | 2023 |
| Trading ZS Ltd | Wholesale & retail | 2021 |
| Traditional Massage Ltd | Health & social care | 2018 |
| Traib Cert Limited | Information & communication | 2017 |
| Training Corporate Solutions Limited | Administrative & support | 2008 |
| Training Select Ltd | Education | 2022 |
| Trainwithclass Ltd | Wholesale & retail | 2015 |
| Tram Solutions Ltd | Information & communication | 2017 |
| Tranquil Enterprises Limited | Wholesale & retail | 2020 |
| Trans 32 K Ltd | Transport & logistics | 2023 |
| Trans Support Ltd | Transport & logistics | 2022 |
| Transapp Ltd | Administrative & support | 2024 |
| Transcend Transport Ltd | Transport & logistics | 2024 |
| Transchem (UK) Ltd | Manufacturing | 2014 |
| Transdell Ltd | Transport & logistics | 2019 |
| Transformate Consulting Limited | Information & communication | 2025 |
| Transformative Partners Limited | Information & communication | 2024 |
| Transhaulage Limited | Transport & logistics | 2021 |
| Transit Bidco Limited | Financial services | 2023 |
| Transit Fleet Ltd | Transport & logistics | 2021 |