| Trudata Solutions Limited | Information & communication | 2023 |
| Trustedreviews Limited | Extraterritorial | 2023 |
| Truuscouture Ltd | Wholesale & retail | 2025 |
| TRY Security Limited | Other services | 2004 |
| TS Management Consultancy Limited | Professional & scientific | 2013 |
| TS SAI Properties Ltd | Real estate | 2024 |
| TSL FM Ltd | Construction | 2024 |
| TSL International Group Limited | Financial services | 2019 |
| TSL International Limited | Professional & scientific | 2019 |
| TSL Limited | Professional & scientific | 2002 |
| TSL Projects Limited | Real estate | 2017 |
| TSS Plumbing and Heating Limited | Construction | 2022 |
| Tsuk Solutions Ltd | Information & communication | 2020 |
| Tudor House Advisory Ltd | Professional & scientific | 2025 |
| Tudorgrade (Container Repairs) Limited | Arts & recreation | 1973 |
| Tulua Ventures LLP | | 2020 |
| Tunnel Fire Services Ltd | Professional & scientific | 2005 |
| Turnwells Ltd | Wholesale & retail | 2024 |
| Tuscan Castings Ltd | Other services | 2010 |
| Tuscan Securities Limited | Real estate | 1973 |
| TW Property Development Limited | Construction | 2015 |
| Twcog Property Holdings LLP | | 2020 |
| Tweak Health Wellness Ltd | Information & communication | 2024 |
| Tweak ME Aesthetics Limited | Other services | 2021 |
| TWENTY4SEVEN Roadside Assistance Ltd | Wholesale & retail | 2021 |
| Twin (UK) Limited | Other services | 2006 |
| Twisted Consulting Limited | Professional & scientific | 2025 |
| TXF Network Limited | Information & communication | 2013 |
| Tyerest Limited | Wholesale & retail | 1976 |
| Typed Hype Ltd | Information & communication | 2022 |
| Tyrone Limited | Real estate | 1954 |
| Ucan Progress Ltd | Professional & scientific | 2003 |
| Ucanlearn Ltd | Information & communication | 2018 |
| Ucanspace Ltd | Education | 2013 |
| UK a Plus Limited | Professional & scientific | 2021 |
| UK Overseas Territories Conservation Forum | Education | 1996 |
| UK Roofing & Plastic Supplies Limited | Extraterritorial | 2024 |
| UK Roofing Supplies Limited | Construction | 1977 |
| Uksol Ltd | Other services | 2015 |
| UMA Devi Properties Limited | Households | 2025 |
| UND Global Trading Limited | Construction | 2021 |
| Underwood Fielders Limited | Real estate | 2012 |
| Uniform Answers Limited | Wholesale & retail | 2006 |
| Unigen Solutions Limited | Information & communication | 2024 |
| Unique Cooling Limited | Manufacturing | 2001 |
| United E Limited | Administrative & support | 2022 |
| UNO Investments Limited | Real estate | 2018 |
| Upclose Energy Advisers Limited | Professional & scientific | 2018 |
| Uplands Brickwork Limited | Construction | 2021 |
| Uppal Healthcare Limited | Health & social care | 2012 |
| Upton Park Estates Limited | Real estate | 2020 |
| Upton Park Group Limited | Financial services | 2020 |
| Upton Park Holdings Limited | Real estate | 2025 |
| Upton Park Housing Limited | Hospitality | 2020 |
| Urban & Academic Limited | Real estate | 2024 |
| Urban Helpers Limited | Administrative & support | 2024 |
| Urban Nest Living Ltd | Real estate | 2025 |
| URE Energy Limited | Energy | 2016 |
| Utterclub Ltd | Administrative & support | 2016 |
| Uxav Solutions Limited | Information & communication | 2019 |
| V & B Italia LLP | | 2007 |
| V & J Property Ltd | Real estate | 2022 |
| Vaaray Nyaray Limited | Wholesale & retail | 2023 |
| Vaastu Investments Ltd | Real estate | 2023 |
| Vaggs Lane Storage Limited | Transport & logistics | 2022 |
| Vale Development (Wooburn Green) Nationwide Limited | Construction | 2020 |
| Valley Way Estate Ltd | Real estate | 2025 |
| Vanbuddy (UK) Limited | Wholesale & retail | 2021 |
| Vanderbilt Freeholds Ltd | Real estate | 2014 |
| Vanessa Reid Limited | Administrative & support | 2011 |
| Vankitz Limited | Extraterritorial | 2019 |
| Vantage Holdings Ltd | Real estate | 2025 |
| Vapour Trail Records Ltd | Manufacturing | 2017 |
| Varia Investments Limited | Education | 2009 |
| Vdsn Ltd | Financial services | 2018 |
| Veera Building Construction Ltd | Construction | 2025 |
| Vekaria Clinical Solutions Limited | Other services | 2023 |
| Venturing Nomad Enterprises Limited | Wholesale & retail | 2024 |
| Veritas Risk Management Limited | Professional & scientific | 2007 |
| Verseiq Ltd | Information & communication | 2025 |
| Vertifarm Limited | Agriculture & fishing | 2023 |
| Vertipharm Limited | Agriculture & fishing | 2019 |
| VFX World Ltd | Administrative & support | 2021 |
| VG Works Limited | Construction | 2003 |
| Vgcare Limited | Health & social care | 2021 |
| Vgrl Limited | Arts & recreation | 2025 |
| VIC Land Ltd | Real estate | 2024 |
| Victoria Court Residents Association Limited | Households | 1988 |
| VID Divine Ltd | Health & social care | 2021 |
| Vidhur Solutions Ltd | Information & communication | 2008 |
| Vidya Property Ltd | Extraterritorial | 2021 |
| Vijoni Management Ltd | Professional & scientific | 2025 |
| Vikoms Limited | Construction | 2021 |
| Vincent Rose Holdings Ltd | Real estate | 2025 |
| Vinsha Consulting Limited | Information & communication | 2018 |
| Vintage Event Catering Ltd | Administrative & support | 2013 |
| Visio Windows Ltd | Manufacturing | 2022 |
| Vision Medicare Limited | Financial services | 2015 |
| Vista Business Consultants Ltd | Real estate | 2023 |
| Vista View Construction Ltd | Construction | 2025 |