| Thirsk Specsavers Hearcare Limited | Wholesale & retail | 2025 |
| Thirsk Specsavers Limited | Wholesale & retail | 2023 |
| Thirty Four Holdings Limited | Financial services | 2026 |
| Thirty-Nine Winn Road Management Company Limited(The) | Households | 1983 |
| Thomas & SON (Builders) Limited | Construction | 2003 |
| Thomas Evelyn Group Limited | Financial services | 2018 |
| Thomas Evelyn Investments Limited | Professional & scientific | 2007 |
| Thomas Evelyn Properties Limited | Real estate | 2017 |
| Thomas Property Maintenance Services Limited | Construction | 2014 |
| Thomasmathew Limited | Health & social care | 2022 |
| Thornber Estates Limited | Real estate | 2018 |
| Thornbird Limited | Professional & scientific | 2023 |
| Thornbury Specsavers Limited | Wholesale & retail | 2012 |
| Thorne Investment Holdings Limited | Financial services | 2020 |
| Thorne Specsavers Limited | Wholesale & retail | 2018 |
| Thornton Financial Ltd | Financial services | 2024 |
| Thorold Dewling & Co Ltd | Administrative & support | 2004 |
| Thought Therapy Ltd | Health & social care | 2026 |
| Three Counties Oak Limited | Manufacturing | 2024 |
| Three Legged Transport Limited | Transport & logistics | 2015 |
| Three Oaks Residential Care Home Ltd | Health & social care | 2003 |
| Three PIN Recycling Ltd | Water & waste | 2013 |
| Threepennybit Freehold Limited | Households | 2022 |
| Thrive Digital Ltd | Health & social care | 2019 |
| Thrivetribe Media Ltd | Manufacturing | 2024 |
| Thronebound Ltd | Arts & recreation | 2025 |
| Thru Data Solutions Limited | Information & communication | 2018 |
| Thunderbrook Rentals Limited | Wholesale & retail | 2024 |
| Thursday 23RD Ltd | Professional & scientific | 2025 |
| Thusion Limited | Information & communication | 2006 |
| Tiaa Limited | Professional & scientific | 2002 |
| Tianie’S Wish the Trail Angel Ltd | Other services | 2025 |
| Tibb Ventures Limited | Construction | 2025 |
| Tiburon Limited | Professional & scientific | 2024 |
| Ticcefelle Limited | Real estate | 2024 |
| Ticcs 1 Limited | Extraterritorial | 2017 |
| Ticcs Limited | Extraterritorial | 2018 |
| Tickover MOT Centre Limited | Wholesale & retail | 2018 |
| Tiddli Ltd | Arts & recreation | 2025 |
| Tideloop Ltd | Professional & scientific | 2025 |
| Tiglian Investments Ltd | Real estate | 2016 |
| Tiglian Residential Ltd | Real estate | 2022 |
| Tikka Take Ltd | Hospitality | 2024 |
| Tilbury Metals Limited | Wholesale & retail | 1988 |
| Tildan Construction Limited | Construction | 2005 |
| Tile Emporium Ltd | Wholesale & retail | 2016 |
| TIM Powell Limited | Administrative & support | 2009 |
| Tim's Autos Ltd | Wholesale & retail | 2021 |
| Timayodele UK Ltd | Health & social care | 2014 |
| Timberi Limited | Wholesale & retail | 2024 |
| Time (Cornwall) Limited | Hospitality | 2018 |
| Time GB (DR) Holdings Limited | Financial services | 2022 |
| Time GB (Offices 2) Limited | Real estate | 2020 |
| Time GB (Padstow) Limited | Hospitality | 2021 |
| Time GB (South Hampshire) Limited | Hospitality | 2019 |
| Time GB (South) Limited | Hospitality | 2019 |
| Time GB (VD) Limited | Hospitality | 2021 |
| Time GB Finance Limited | Financial services | 2018 |
| Time Group Mezzco Limited | Financial services | 2020 |
| Time Group Midco Limited | Financial services | 2020 |
| Time Group of Companies Limited | Financial services | 2022 |
| Time Group Topco Limited | Financial services | 2020 |
| Time Holdco Limited | Financial services | 2020 |
| Time OUT Childcare Group Limited | Health & social care | 2016 |
| Time Prestige Ltd | Wholesale & retail | 2020 |
| Time Property Holdings Limited | Financial services | 2022 |
| Time Property Investors Ltd | Real estate | 2025 |
| Time Topco Limited | Financial services | 2020 |
| Time Topco Stock Co Limited | Hospitality | 2021 |
| TIN Roof Tech Ltd | Information & communication | 2023 |
| Tinker Tailor Careers Management Ltd | Administrative & support | 2011 |
| Tinkerbell Properties Limited | Real estate | 2025 |
| Tiptoe Tech Ltd | Information & communication | 2025 |
| Tirem Partners Ltd | Real estate | 2024 |
| Tirius Limited | Professional & scientific | 1986 |
| Titan Infotech Ltd | Information & communication | 2017 |
| Titchfield Body Shop Limited | Wholesale & retail | 2014 |
| Titchfield Builders Limited | Construction | 2009 |
| Titchfield Car Sales Limited | Wholesale & retail | 2004 |
| Titchfield Festival Theatre Productions Limited | Arts & recreation | 2004 |
| Titchfield Festival Youth Theatre Ltd | Arts & recreation | 2022 |
| Titchfield Organ Society | Other services | 2016 |
| Titchfield Wheel & Tyre Ltd | Wholesale & retail | 2018 |
| Tito Ltd | Health & social care | 2017 |
| Tiverton Specsavers Limited | Wholesale & retail | 2018 |
| TJ Mobile Fleet Wash Limited | Wholesale & retail | 2021 |
| Tj's Club (Hampshire) Ltd | Health & social care | 2016 |
| TJB Management Limited | Professional & scientific | 2011 |
| TJM Parts UK Limited | Wholesale & retail | 2025 |
| TJS Roofing and Property Services Ltd | Construction | 2019 |
| TK Legal Consulting Limited | Professional & scientific | 2015 |
| TL Properties Southern Limited | Real estate | 2015 |
| TLF Professional Services Ltd | Professional & scientific | 2026 |
| TLM Laser Limited | Manufacturing | 2005 |
| Tlsa International Limited | Professional & scientific | 2009 |
| TMB Transport Services Ltd | Transport & logistics | 2016 |
| TMS Contracting Ltd | Manufacturing | 2020 |
| TNB Transocean Limited | Wholesale & retail | 2016 |
| TO70 Ltd | Extraterritorial | 2022 |
| Toastd Limited | Manufacturing | 2014 |