| Treasured Scents Limited | Administrative & support | 1996 |
| Tree Distributions Limited | Professional & scientific | 2021 |
| Tribeni Investments Ltd | Real estate | 2021 |
| Truck Tyre Wholesalers Limited | Manufacturing | 2021 |
| TSW Bucks Ltd | Hospitality | 2026 |
| TTT Property Ltd | Real estate | 2026 |
| Tubrid Holdings Limited | Financial services | 2024 |
| Tubrid Property 1 Limited | Real estate | 2024 |
| Tuft LUV Ltd | Wholesale & retail | 2025 |
| Turner Property Group Ltd | Real estate | 2026 |
| TW-1 Holdings Limited | Professional & scientific | 2022 |
| TW-3 Architects Limited | Professional & scientific | 2022 |
| TW2 Architects Limited | Professional & scientific | 2003 |
| TWG Clinics Ltd | Health & social care | 2025 |
| TWH Offices Ltd | Real estate | 2025 |
| U Stream U Stay Ltd | Information & communication | 2020 |
| UA Development Ltd | Real estate | 2025 |
| UK Carousel Ltd | Manufacturing | 2023 |
| UK Gurdwaras Ltd | Information & communication | 2024 |
| UK Jubilee Limited | Other services | 2013 |
| UK Maintenance Ltd | Other services | 2015 |
| ULE Global Limited | Professional & scientific | 2025 |
| Unapologetically Brown CIC | Arts & recreation | 2026 |
| Unibest Solutions Limited | Administrative & support | 2018 |
| Unit Move Transport Ltd | Transport & logistics | 2026 |
| United Legal Experts Limited | Professional & scientific | 2018 |
| Universal Holdings and Investments Limited | Financial services | 2022 |
| Universal PUB Co Limited | Hospitality | 2018 |
| Universal Scaffolding Limited | Construction | 2015 |
| UR Career Ltd | Administrative & support | 2010 |
| UR Mortgage London Ltd | Financial services | 2020 |
| Urbanspree Ltd | Hospitality | 2025 |
| Ushers Quay Consulting Ltd | Professional & scientific | 2025 |
| Uxbridge Bathroom & Plumbing Ltd | Wholesale & retail | 2021 |
| Uxbridge Glass Ltd | Manufacturing | 2026 |
| V Line Works Limited | Other services | 2017 |
| V7D Ltd | Professional & scientific | 2020 |
| VAK18 Ltd | Administrative & support | 2018 |
| Valeta Services Limited | Administrative & support | 2023 |
| Vantage Exterior Cleaning Ltd | Construction | 2020 |
| Varsa Corp Limited | Real estate | 2004 |
| Vasy Electrical Ltd | Construction | 2025 |
| Vault by Evergreen Limited | Wholesale & retail | 2025 |
| Veera Investments Limited | Real estate | 2016 |
| VG Property Holdings Ltd | Real estate | 2022 |
| Victory Films Limited | Information & communication | 2018 |
| Vievon Ltd | Wholesale & retail | 2023 |
| Vinyl CUT Ltd | Information & communication | 2026 |
| Virginia Currer Marine Limited | Other services | 2002 |
| Virk Property Investments Ltd | Construction | 2012 |
| Vital Equity Investments Ltd | Professional & scientific | 2025 |
| Vivuh Ltd | Professional & scientific | 2017 |
| VJS Solutions Limited | Professional & scientific | 2005 |
| Voyton Ltd | Transport & logistics | 2026 |
| Vyapar Ltd | Wholesale & retail | 2005 |
| Warpaint Cosmetics (2014) Limited | Wholesale & retail | 2014 |
| Warpaint Cosmetics Group Limited | Wholesale & retail | 2014 |
| Warpaint London PLC | Wholesale & retail | 2016 |
| Waul Limited | Wholesale & retail | 2016 |
| Way Investments Limited | Extraterritorial | 2015 |
| Wdia Construction Ltd | Construction | 2024 |
| WE Love Recycling Ltd | Water & waste | 2022 |
| WE Windows Limited | Construction | 2018 |
| Weathershield Roofers and Decorators Ltd | Construction | 2026 |
| Web Labs Limited | Information & communication | 2001 |
| Weir Utilities Ltd | Energy | 2025 |
| Welland Developments Ltd | Construction | 2005 |
| West Coast Automotive Services Ltd | Wholesale & retail | 2023 |
| West for Buildings Ltd | Construction | 2020 |
| West London Autos Ltd | Manufacturing | 2017 |
| West London Build Ltd | Construction | 2022 |
| West London Storage Ltd | Construction | 2018 |
| West Space Construction (London) Ltd | Construction | 2017 |
| WEST4COLOURS Limited | Construction | 2015 |
| WFS Executive Ltd | Transport & logistics | 2016 |
| William Smith Traders Ltd | Construction | 2022 |
| Willow and Oak Events Limited | Other services | 2018 |
| Wilridge Property Limited | Real estate | 2020 |
| Winci Ltd | Administrative & support | 2019 |
| Winner Phase Ltd. | Information & communication | 2025 |
| Wireless Tracking Ltd | Wholesale & retail | 2014 |
| Wise Ways Consultancy Ltd | Information & communication | 2025 |
| Wiseworld Wholesale Ltd | Wholesale & retail | 2023 |
| Wmed Services Ltd. | Professional & scientific | 2013 |
| Wolfjets Ltd. | Transport & logistics | 2025 |
| Wolfpack 168 Limited | Information & communication | 2023 |
| Wolfthorn Knight Ltd. | Education | 2017 |
| Wolfthorn Prince Ltd | Professional & scientific | 2017 |
| Wolta Limited | Administrative & support | 2017 |
| Women in Travel CIC | Administrative & support | 2017 |
| Women in Wellness Ltd | Health & social care | 2025 |
| Workpath Technical Solutions Limited | Administrative & support | 2026 |
| Worldwide Heat Exchanger Services Limited | Manufacturing | 2018 |
| WPO Developments Ltd | Real estate | 2020 |
| WPS 1404 Limited | Real estate | 2022 |
| Wren Court Management Co. Limited | Households | 1987 |
| Wylands Management Limited | Households | 1961 |
| Wyoming Services Limited | Information & communication | 2023 |
| Wyrdren Games Ltd | Information & communication | 2020 |
| Yanniseb Services Ltd | Transport & logistics | 2017 |