| Tradezon Ltd | Wholesale & retail | 2025 |
| Trading Trendz Ltd | Wholesale & retail | 2023 |
| Traditions Investment Limited | Real estate | 2003 |
| Tradix Ltd | Wholesale & retail | 2025 |
| Trafalgar Foods Limited | Wholesale & retail | 2000 |
| Trafalgar Leisure Ltd | Hospitality | 1999 |
| Tragurion Decor Ltd | Construction | 2023 |
| Traid Limited | Financial services | 2023 |
| Traid Technologies Limited | Information & communication | 2022 |
| Trail Films Limited | Information & communication | 2018 |
| Train NOW Limited | Education | 2024 |
| Trainme Ltd | Information & communication | 2024 |
| Tranacombe Limited | Financial services | 1970 |
| Tranquil Dimensions Ltd | Wholesale & retail | 2022 |
| Tranquil Retail Services Limited | Wholesale & retail | 2022 |
| Trans Dasi Services Ltd | Construction | 2020 |
| Trans Grace Limited | Wholesale & retail | 2024 |
| Trans LUE Limited | Transport & logistics | 2017 |
| Trans.Oj Ltd | Transport & logistics | 2025 |
| Transaction Plus Ltd | Professional & scientific | 2016 |
| Transcend Therapeutics Limited | Professional & scientific | 2022 |
| Transcend UK Holdings Ltd | Wholesale & retail | 2024 |
| Transcontinental Exports (UK) Limited | Wholesale & retail | 1987 |
| Transfer Connex Holding Ltd | Financial services | 2025 |
| Transfer Connex Limited | Financial services | 2016 |
| Transfleet Properties Limited | Real estate | 2015 |
| Transfleet Residential Limited | Real estate | 2024 |
| Transform Audio Visual Ltd | Wholesale & retail | 2015 |
| Transforming Homes Limited | Construction | 2019 |
| Transforming IT Ltd | Information & communication | 2017 |
| Transformologist Ltd | Professional & scientific | 2021 |
| Transglobal Advisory Ltd | Professional & scientific | 2024 |
| Transglobal Wholesale Ltd | Construction | 2020 |
| Transmach Systems Limited | Information & communication | 2011 |
| Transmaxi Ltd | Transport & logistics | 2023 |
| Transmony Ltd | Financial services | 2022 |
| Transnelu Ltd | Other services | 2023 |
| Transnow Ltd | Transport & logistics | 2021 |
| Transonel Ltd | Wholesale & retail | 2025 |
| Transport NOW Limited | Transport & logistics | 2022 |
| Transtel Utilities Limited | Construction | 2019 |
| Transvora Logistics Limited | Transport & logistics | 2020 |
| Transworld Business Machines Ltd | Professional & scientific | 2025 |
| Travel & Thrive Limited | Transport & logistics | 2025 |
| Travel Beavers Ltd | Administrative & support | 2024 |
| Travel Rise Ltd | Administrative & support | 2025 |
| Travel Time Solutions Ltd | Administrative & support | 2017 |
| Travel Unravel Holidays Private Limited | Administrative & support | 2010 |
| Travel X Lifestyle Limited | Administrative & support | 2023 |
| Travel Xtreme Ltd | Administrative & support | 2025 |
| Travel ZEN Ltd | Administrative & support | 2021 |
| Travelformations Ltd | Administrative & support | 2021 |
| Travelhurst Limited | Real estate | 2022 |
| Travelmode Limited | Professional & scientific | 2002 |
| Travelxp Limited | Administrative & support | 2009 |
| Traves Management Limited | Real estate | 2013 |
| Trawely Ltd | Health & social care | 2019 |
| Trawonder Limited | Real estate | 2018 |
| Traxps Ltd | Wholesale & retail | 2024 |
| Trayvale Limited | Administrative & support | 1976 |
| TRC Radiology Imaging Limited | Health & social care | 2021 |
| TRD Global Limited | Wholesale & retail | 2025 |
| TRD Site Engineering Ltd | Administrative & support | 2016 |
| TRE Medicolegal Ltd | Professional & scientific | 2021 |
| TRE Products UK Limited | Wholesale & retail | 2017 |
| Treasure Bargains Ltd | Wholesale & retail | 2024 |
| Treasure Island Entertainment Ltd | Arts & recreation | 2023 |
| Treasured Forever Ltd | Wholesale & retail | 2017 |
| Treasured Forever Properties Ltd | Real estate | 2022 |
| Treasured Valuations Ltd | Administrative & support | 2020 |
| Treat Republic Limited | Wholesale & retail | 2020 |
| Treclaro Ltd | Information & communication | 2016 |
| Tredd Well Limited | Wholesale & retail | 2020 |
| Tree Dees Investments Limited | Real estate | 2016 |
| Tree of Life Properties Limited | Real estate | 2014 |
| Tree System UK Limited | Information & communication | 2020 |
| Trellis Estates Limited | Construction | 2006 |
| Trend House Invests Limited | Real estate | 2024 |
| Trend Market Research Limited | Professional & scientific | 2014 |
| Trendbuild Limited | Construction | 1985 |
| Trendera Emporium Limited | Wholesale & retail | 2025 |
| Trending Games Limited | Wholesale & retail | 2019 |
| Trendiva Ltd | Wholesale & retail | 2025 |
| Trends by Rukhsar Virani Ltd | Other services | 2025 |
| Trendshire Limited | Other services | 1975 |
| Trendy Investments Limited | Administrative & support | 2014 |
| Trendy Teddy Ltd | Wholesale & retail | 2024 |
| Trendygoodz Ltd | Wholesale & retail | 2024 |
| Trendyhands Ltd | Wholesale & retail | 2025 |
| Treon Property Investment Limited | Real estate | 2016 |
| Treswemedia Limited | Information & communication | 2024 |
| Trevelyan Property Investments Limited | Real estate | 2020 |
| Trevor Close Residents Association Limited | Households | 1962 |
| Trevor Heaps Arboricultural Consultancy Ltd. | Professional & scientific | 2014 |
| Trevor Kidd Consultants Limited | Administrative & support | 1993 |
| Trexin Consultancy Limited | Transport & logistics | 2013 |
| Trexin Ltd | Wholesale & retail | 2019 |
| Trexin Property Ltd | Real estate | 2022 |
| Treynor Advisory Services Ltd | Other services | 2023 |
| TRF Construction(Uk) Ltd | Construction | 2021 |