| Trilix Spice Ltd | Hospitality | 2025 |
| Trimform Products Limited | Extraterritorial | 1996 |
| Trinidoc Property Ltd | Real estate | 2023 |
| Trinity Art N Crafts Ltd | Arts & recreation | 2025 |
| Trinity Building and Bathrooms Ltd | Construction | 2026 |
| Trinity Communications Ltd | Information & communication | 2017 |
| Trinity Limited | Wholesale & retail | 2025 |
| Trinity ROC Investments Limited | Hospitality | 2025 |
| Trinity Vehicle Installations Ltd | Other services | 2014 |
| Trinsiq Ltd | Information & communication | 2015 |
| Trio Carpets Limited | Wholesale & retail | 2013 |
| Triogue Ortho Ltd | Health & social care | 2022 |
| Trip 2 Town Ltd | Education | 2025 |
| Triple a Building Ltd | Construction | 2014 |
| Triple a Innovations Limited | Health & social care | 2023 |
| Triple JJJ Ltd | Real estate | 2025 |
| Triple Leveraged Investments Limited | Real estate | 2025 |
| Triple One Services Ltd | Construction | 2025 |
| Triple P Productions Limited | Arts & recreation | 2013 |
| Triple Point Brewing Ltd | Manufacturing | 2018 |
| Triple Vine Ltd | Real estate | 2026 |
| Triplesure Glazing Ltd | Construction | 2024 |
| Tripocity Ltd | Transport & logistics | 2021 |
| Tripsmarket Limited | Administrative & support | 2013 |
| Triskelium Limited | Wholesale & retail | 2019 |
| Triton Textiles Limited | Manufacturing | 2023 |
| Trixie's Pantry Ltd | Wholesale & retail | 2024 |
| Triyourtri Limited | Education | 2019 |
| TRL Training & Development Ltd | Information & communication | 2017 |
| TRL Training Ltd | Public administration | 2025 |
| Troi Sealey Coaching Ltd | Education | 2025 |
| Trojan Engineering (Deepcar) Ltd | Manufacturing | 2014 |
| Troodel Limited | Manufacturing | 2026 |
| Troop M Limited | Wholesale & retail | 2018 |
| Tropic Leap Limited | Professional & scientific | 2024 |
| Tropical Butterfly House Limited | Arts & recreation | 2012 |
| Tropics Caribbean Cuisine Limited | Hospitality | 2025 |
| Trotter Holdings Ltd | Financial services | 2021 |
| Trouble Holiday LET Ltd | Real estate | 2025 |
| Trouble Properties Ltd | Real estate | 2003 |
| Trouble Rental Ltd | Real estate | 2025 |
| Trowell Retail Limited | Wholesale & retail | 2025 |
| Troy Business Ltd | Hospitality | 2025 |
| TRS Events Ltd | Hospitality | 2022 |
| Trucksafe Commercials Limited | Wholesale & retail | 2024 |
| Trucksafe Logistics Ltd | Transport & logistics | 2023 |
| True Brit London Limited | Wholesale & retail | 2014 |
| True Comfort Care Ltd | Health & social care | 2026 |
| True Components Ltd | Manufacturing | 2020 |
| True Energy Ltd | Professional & scientific | 2026 |
| True Flame Chimney Services Ltd | Construction | 2025 |
| True Integrated Care Ltd | Other services | 2010 |
| True Line Motors Group Ltd | Wholesale & retail | 2026 |
| True North Adventures Limited | Administrative & support | 2024 |
| True North Brew Co Ltd | Manufacturing | 2015 |
| True North Cycle Hub Limited | Wholesale & retail | 2016 |
| True North Joinery Ltd | Construction | 2025 |
| True North Living Limited | Health & social care | 2025 |
| True North Projects Ltd | Construction | 2020 |
| True Print Limited | Wholesale & retail | 2018 |
| True Romance Productions Ltd | Information & communication | 2003 |
| True Value Motor House Limited | Wholesale & retail | 2023 |
| True-Line Electrical Services Ltd | Construction | 2023 |
| Trueglide Ltd | Construction | 2021 |
| Trueland Estates Ltd | Real estate | 2024 |
| Truelove Accountants Ltd | Professional & scientific | 2025 |
| Trueman Homes Limited | Real estate | 2017 |
| Truevale Limited | Professional & scientific | 2017 |
| Truffle PIG Vegan Limited | Manufacturing | 2020 |
| Trulan Limited | Other services | 2014 |
| Trulife Limited | Manufacturing | 1983 |
| Truly East Limited | Information & communication | 2024 |
| Truly Worthy Ltd | Wholesale & retail | 2025 |
| Trumpler Leather Chemicals Limited | Wholesale & retail | 2008 |
| Trunce Farm Limited | Agriculture & fishing | 2021 |
| Trupeak Consulting Ltd | Professional & scientific | 2023 |
| Trust Fire & Safety Limited | Professional & scientific | 2007 |
| Trust Works FM Limited | Administrative & support | 2025 |
| Trusted Healthcare Partners Limited | Health & social care | 2017 |
| Trusted Hill Homes Ltd | Real estate | 2025 |
| Trusted HR Limited | Administrative & support | 2012 |
| Trustees of Axis Architecture Limited | Professional & scientific | 2016 |
| Trustees of the Mineworkers' Pension Scheme Limited | Financial services | 1998 |
| Trés Matcha Ltd | Hospitality | 2025 |
| TS Direct Limited | Administrative & support | 1999 |
| TS Kitchen Ltd | Hospitality | 2018 |
| TS Operations Ltd | Administrative & support | 2025 |
| TS Pizza & Grill Ltd | Hospitality | 2019 |
| TS Real Estate Limited | Real estate | 2022 |
| TS Yorkshire Builders Ltd | Construction | 2015 |
| Tsap Ltd | Administrative & support | 2013 |
| TSD Engineering Limited | Professional & scientific | 2004 |
| TSD Gymnastics Academy CIC | Arts & recreation | 2021 |
| TSD Martial Arts & Urban Sports CIC | Arts & recreation | 2014 |
| TSE Financial Limited | Professional & scientific | 2014 |
| TSF Property Investments Ltd | Real estate | 2023 |
| TSG Roofing & Cladding Limited | Construction | 2020 |
| TSL Education Limited | Extraterritorial | 1983 |
| TSL Education SPV 2 Limited | Professional & scientific | 2007 |
| TSL Education US Holdings Limited | Professional & scientific | 2013 |