| Transform Schools (Birmingham) Holdings Limited | Financial services | 2005 |
| Transform Schools (Birmingham) Limited | Construction | 2005 |
| Transform Schools (North Lanarkshire) Funding PLC | Financial services | 2005 |
| Transform Schools (North Lanarkshire) Holdings Limited | Professional & scientific | 2005 |
| Transform Schools (North Lanarkshire) Intermediate Limited | Financial services | 2005 |
| Transform Schools (North Lanarkshire) Limited | Construction | 2005 |
| Transform Schools (Rotherham) Holdings Limited | Professional & scientific | 2003 |
| Transform Schools (Rotherham) Limited | Administrative & support | 2003 |
| Transform Schools (Stoke) Holdings Limited | Financial services | 2000 |
| Treadgold & Sons Ltd | Real estate | 2025 |
| Trend Analytics Ltd | Information & communication | 2022 |
| Tricilia Limited | Professional & scientific | 2014 |
| Tricomm Housing (Portsmouth) Holdings Limited | Construction | 2005 |
| Tricomm Housing (Portsmouth) Limited | Construction | 2005 |
| Trimline Group Limited | Wholesale & retail | 2023 |
| Trimline Innovation Limited | Extraterritorial | 2016 |
| Tritech Electrical Contractors Limited | Construction | 2015 |
| Tritech Sound and Lighting Limited | Information & communication | 2022 |
| Tronix Systems Ltd | Administrative & support | 2020 |
| Trumpton Properties Ltd | Real estate | 2018 |
| Truth Temple Outreach Ministries Ltd | Health & social care | 2023 |
| Tsjc Services Limited | Professional & scientific | 2025 |
| Tsjp Associates Ltd | Real estate | 2020 |
| TSL Kent Limited | Transport & logistics | 2022 |
| Tudor CC Limited | Real estate | 2015 |
| Tugas Plumbing Ltd | Construction | 2026 |
| Tulip Property Group Ltd | Real estate | 2023 |
| Tunbridge Wells Carpentry and Building Limited | Construction | 2024 |
| Tuning Plus Ltd | Wholesale & retail | 2026 |
| Turford Construction Co Limited | Transport & logistics | 2008 |
| TURNPOINTLK30 Limited | Real estate | 2020 |
| TW Quantity Surveying Ltd | Professional & scientific | 2014 |
| Twinkle Treats Ltd | Wholesale & retail | 2025 |
| Twinkletoes (Early Years) Pre-School Limited | Health & social care | 2018 |
| TY1 Ltd | Agriculture & fishing | 2019 |
| UBS Bond Facilities Limited | Professional & scientific | 2025 |
| UK Green Investment Galloper Limited | Financial services | 2015 |
| UK Green Investment Lyle Limited | Financial services | 2016 |
| UK Green Investment Rampion Limited | Financial services | 2015 |
| UK Highways A55 (Holdings) Limited | Financial services | 1998 |
| UK Highways A55 Limited | Construction | 1998 |
| UK Highways Limited | Professional & scientific | 1997 |
| UK Highways M40 (Holdings) Limited | Administrative & support | 1994 |
| UK Highways M40 Limited | Administrative & support | 1995 |
| UK Highways Management Services Limited | Administrative & support | 1997 |
| UK PMU Experts Limited | Education | 2024 |
| Ultimate Pets Ltd | Wholesale & retail | 2011 |
| Ultrad Ltd | Public administration | 2023 |
| Umoja Sound Ltd | Information & communication | 2026 |
| Umpa Limited | Professional & scientific | 2021 |
| Undercroft Construction Limited | Construction | 2012 |
| Unico Limited | Wholesale & retail | 1965 |
| Union Brands Trading Co Ltd | Professional & scientific | 2026 |
| United Healthcare (South Buckinghamshire) Group Limited | Administrative & support | 2001 |
| United Healthcare (South Buckinghamshire) Holdings Limited | Administrative & support | 1997 |
| United Healthcare (South Buckinghamshire) Limited | Administrative & support | 1997 |
| Universal Construction (Kent) Ltd | Construction | 2014 |
| Unplugged PR Limited | Other services | 2018 |
| Unreal Beauty & Aesthetics Ltd | Education | 2021 |
| Unreal Beauty Beyond Belief Ltd | Other services | 2018 |
| Urban Bloom Limited | Wholesale & retail | 2022 |
| Urban Body Repairs Ltd | Wholesale & retail | 2014 |
| Urban Enhance Limited | Real estate | 2000 |
| Urban Partners Limited | Administrative & support | 2012 |
| Utopia Electrical Solutions Ltd | Professional & scientific | 2012 |
| Utopia Trading Group Limited | Education | 2023 |
| V Kappala-Ramsamy Ltd | Health & social care | 2014 |
| V&R Financial Limited | Professional & scientific | 2025 |
| Valley View Motorhomes Limited | Wholesale & retail | 2022 |
| Value in Pixels Ltd | Information & communication | 2016 |
| Van Torino LLP | | 2021 |
| Vandon-Louise Limited | Health & social care | 2022 |
| Vantainer Limited | Manufacturing | 2020 |
| VDR Construction Support Services Ltd | Construction | 2014 |
| Velectro Builders Ltd | Construction | 2018 |
| Velvet International Property Holdings Ltd | Financial services | 2024 |
| Venus & Co UK Ltd | Hospitality | 2020 |
| Vercity Holdings Limited | Financial services | 1996 |
| Vercity Management Services Limited | Professional & scientific | 1999 |
| Vercity Social Infrastructure (UK) Limited | Professional & scientific | 1991 |
| Verella Limited | Wholesale & retail | 2023 |
| Versa IT Ltd | Professional & scientific | 2023 |
| Vert Flooring Ltd | Construction | 2014 |
| Vertex Services Group Limited | Construction | 1990 |
| Verulam Window Cleaning Limited | Administrative & support | 2026 |
| Vicola Consultancy Ltd | Information & communication | 2017 |
| Victory Lettings (Kent) Ltd | Real estate | 2022 |
| Vidette Holdings Limited | Financial services | 2022 |
| Vidette UK Limited | Construction | 2003 |
| Viewpoint Projects Ltd | Professional & scientific | 2024 |
| Village at 6 Investments Limited | Financial services | 2016 |
| Vincam Facilities Limited | Administrative & support | 2020 |
| Vineyard Investment Limited | Information & communication | 2004 |
| Virsolus Limited | Professional & scientific | 2021 |
| Vision Electrical Contractors Limited | Construction | 2011 |
| Visions Homes Ltd | Real estate | 2024 |
| Vitesse Limited | Information & communication | 1999 |
| VIV777 Ltd | Transport & logistics | 2017 |
| Vivid Light Works Limited | Manufacturing | 2021 |
| VK Flooring Ltd | Construction | 2021 |