| Trusted Flyer Ltd | Administrative & support | 2019 |
| Trusted Friends Pet Funeral Services Ltd | Other services | 2015 |
| Trusted Pet Carers Limited | Other services | 2012 |
| Trustedia Limited | Administrative & support | 2009 |
| Trusting Reliable Services (TRS) Ltd | Transport & logistics | 2020 |
| Trustlet Property Group Limited | Real estate | 2025 |
| Trustwell Care & Consult Ltd | Professional & scientific | 2025 |
| TRY Again Couriers Ltd | Transport & logistics | 2023 |
| TRY Ball Ltd | Information & communication | 2026 |
| Tryj's Limited | Health & social care | 2022 |
| TS Drylining Sisqo Ltd | Construction | 2010 |
| TS Expo Ltd | Wholesale & retail | 2012 |
| TS Property Management Limited | Real estate | 2016 |
| TSB Enterprises Ltd | Health & social care | 2010 |
| TSC Subsea Ltd | Manufacturing | 1984 |
| TSC Testing Ltd | Information & communication | 2020 |
| Tscm Consulting Ltd | Professional & scientific | 2020 |
| TSF Property Ltd | Real estate | 2019 |
| Tsha Consultancy Ltd | Information & communication | 2016 |
| Tshuks Ltd | Transport & logistics | 2022 |
| TSK Property Investments Limited | Real estate | 2019 |
| TSK Sland Sushi Bar Limited | Hospitality | 2024 |
| Tsmf Ltd | Real estate | 2023 |
| TSR Fited Ltd | Manufacturing | 2026 |
| Tssm Limited | Health & social care | 2016 |
| Tsuen WAN Ltd | Hospitality | 2023 |
| TSW Logisticss Ltd | Transport & logistics | 2014 |
| TT Body and Wheel Repairs Ltd | Wholesale & retail | 2024 |
| TT International Events Limited | Arts & recreation | 2023 |
| TT500 Ltd | Real estate | 2001 |
| Ttmo UK Limited | Health & social care | 2022 |
| TTS Pharma Limited | Wholesale & retail | 2012 |
| TTT Pet Supplies MK Ltd | Wholesale & retail | 2025 |
| TTW Properties Limited | Real estate | 2021 |
| Ttwp Ltd | Professional & scientific | 2019 |
| Tubman Investments Ltd | Financial services | 2020 |
| Tubular Erectors Limited | Construction | 1989 |
| Tucano Ltd | Construction | 2021 |
| Tucker Brown Ltd | Administrative & support | 2023 |
| Tucson Services Ltd | Wholesale & retail | 2025 |
| Tudor Forest Ltd | Real estate | 2023 |
| Tudor Rose Properties (Midlands) Limited | Real estate | 2016 |
| Tudosan Ltd | Transport & logistics | 2018 |
| Tudose Ltd | Transport & logistics | 2025 |
| Tull Industrial Ltd | Manufacturing | 2015 |
| Tullett Plant and Commercial Services Limited | Wholesale & retail | 1976 |
| Tully Engineering Ltd | Manufacturing | 2022 |
| Tumblebyte Limited | Information & communication | 2017 |
| Tumi Jaan Limited | Construction | 2026 |
| Tumza Ltd | Health & social care | 2013 |
| Tuncare Healthcare Services Ltd. | Health & social care | 2011 |
| Tunde Cole Network Ltd | Professional & scientific | 2025 |
| Tuneful Pianos Limited | Education | 2023 |
| Tunnel to Terrace Ltd | Wholesale & retail | 2025 |
| Tunnel V1SION Ltd | Manufacturing | 2025 |
| Tunneys Legal Limited | Administrative & support | 2025 |
| Tunny Plumbing & Heating Limited | Construction | 2013 |
| Tupello Marketing Ltd | Professional & scientific | 2003 |
| Tuppeny BIT Ltd | Professional & scientific | 2024 |
| Turkish Kitchen MK Ltd | Hospitality | 2026 |
| Turnbrook Limited | Hospitality | 2014 |
| Turner & Young Ltd | Real estate | 2026 |
| Turney Landscapes Limited | Administrative & support | 1995 |
| Turnford Consulting Limited | Information & communication | 2004 |
| Turnkey Solution Provider Ltd | Manufacturing | 2025 |
| Turnmill Services Ltd | Administrative & support | 2014 |
| Turquazze Restaurant Ltd | Hospitality | 2026 |
| Turret Two Limited | Information & communication | 2012 |
| Tutch Limited | Professional & scientific | 2022 |
| Tuthill Harvesters Ltd. | Manufacturing | 2017 |
| Tutka Ltd | Transport & logistics | 2021 |
| Tutorika Ltd | Education | 2024 |
| Tutoring Support Solutions Limited | Education | 2026 |
| Tutortouch Technologies Ltd | Manufacturing | 2020 |
| TV Cables Limited | Extraterritorial | 2008 |
| Tvara Ltd | Wholesale & retail | 2025 |
| TVD Trans Ltd | Transport & logistics | 2024 |
| TVG Pharma Ltd | Professional & scientific | 2018 |
| Tvgm Limited | Health & social care | 2014 |
| TVM Healthcare Limited | Professional & scientific | 1981 |
| TVP Ashland Ltd | Hospitality | 2025 |
| TVR IT Consultancy Ltd | Information & communication | 2013 |
| TVS Property Investments Ltd | Real estate | 2025 |
| TW Imports Limited | Wholesale & retail | 2018 |
| Twb-Av Limited | Information & communication | 2012 |
| TWD Group Ltd | Administrative & support | 2018 |
| TWD White Holdings Ltd | Administrative & support | 2025 |
| Tweeddale Consultancy Ltd | Information & communication | 2022 |
| Twelve Eleven Atelier Ltd | Wholesale & retail | 2026 |
| TWELVE2A Ltd | Professional & scientific | 2026 |
| Twennyone Limited | Professional & scientific | 2022 |
| Twenty Eight Power Ltd | Professional & scientific | 2024 |
| Twenty Four Karat Cocoa Limited | Wholesale & retail | 2023 |
| Twenty Holdings Ltd | Financial services | 2019 |
| Twenty Investments Limited | Financial services | 2014 |
| Twenty Online Limited | Other services | 1992 |
| Twenty SIX Twelve Ltd | Real estate | 2018 |
| Twenty Tech UK Ltd | Information & communication | 2019 |
| TWENTY3D Limited | Professional & scientific | 2014 |
| TWENTY5 Ventures Limited | Arts & recreation | 2013 |