| Truefitt Windows Limited | Construction | 1998 |
| Truevantage Ltd | Information & communication | 2023 |
| Trusted Business Intelligence Limited | Information & communication | 2006 |
| Trustedpropertysolutions Ltd | Construction | 2026 |
| Tsecure Limited | Administrative & support | 2021 |
| Turf Supplies Essex Ltd | Wholesale & retail | 2025 |
| Turnabout Landscapes Limited | Administrative & support | 2008 |
| Turnabout Limited | Construction | 2008 |
| Turnkey Stays LDN Ltd | Real estate | 2025 |
| Twareg Ltd | Professional & scientific | 2016 |
| Twinkle Properties UK Limited | Real estate | 2025 |
| Twisted Pair Automation Ltd | Manufacturing | 2025 |
| Tyburn Management LLP | | 2015 |
| Tyroplates Trade Ltd | Manufacturing | 2023 |
| Tyrrell Design Limited | Professional & scientific | 2008 |
| UK Intruder Systems Limited | Construction | 2013 |
| Ukleen Ltd | Other services | 2010 |
| Umayyad Legacy Ltd | Professional & scientific | 2025 |
| UMD Foods Ltd | Hospitality | 2025 |
| Undrground Ltd | Wholesale & retail | 2022 |
| Unearthed African Music Ltd | Information & communication | 2024 |
| Unearthed African Recordings Ltd | Information & communication | 2023 |
| Unico Lounge Limited | Real estate | 2014 |
| Unit Eleven Studios Limited | Arts & recreation | 2019 |
| Uppingas Properties Ltd | Real estate | 2024 |
| Upti Records Ltd | Wholesale & retail | 2020 |
| Uptick Trading Ltd | Information & communication | 2024 |
| Urban Lofts / Extensions UK Ltd | Construction | 2022 |
| UTL Cabling Solutions Limited | Construction | 2013 |
| UTL Document Solutions Limited | Manufacturing | 2013 |
| UTL Telecom Solutions Limited | Information & communication | 2013 |
| Va.City Executive Services Limited | Extraterritorial | 2020 |
| Valle DEI Templi Limited | Hospitality | 2021 |
| Vanstocks Ltd | Wholesale & retail | 2026 |
| Vape Ltd | Wholesale & retail | 2023 |
| Vector Four Ltd | Professional & scientific | 2011 |
| Vega Manufacturing Limited | Construction | 2019 |
| Velivo Limited | Manufacturing | 2026 |
| Ventura Property Limited | Real estate | 2007 |
| Vertedge Ltd | Manufacturing | 2019 |
| Vertical Partners Limited | Construction | 2023 |
| Vett Logistics Ltd | Transport & logistics | 2018 |
| Vianna Wine Resources Ltd | Hospitality | 2015 |
| Vicbenok Limited | Hospitality | 2025 |
| Vigilant Business Solutions Ltd | Administrative & support | 2020 |
| Vik.Medfurniture Ltd | Construction | 2025 |
| Village Green Properties Limited | Real estate | 1998 |
| Villatech Limited | Households | 1983 |
| VIN Logistics Limited | Information & communication | 2007 |
| Vince's Bodyshop Ltd | Wholesale & retail | 2021 |
| VIP Grooming Hair Ltd | Other services | 2025 |
| VIP Grooming Mobile Ltd | Other services | 2025 |
| Visionmi Consulting Ltd | Information & communication | 2012 |
| Visiting Music Teachers Limited | Education | 2023 |
| Voltaic Consulting Limited | Construction | 2000 |
| W H Construction Ltd | Water & waste | 2016 |
| Wads Limited | Administrative & support | 1996 |
| Wahabecom Ltd | Wholesale & retail | 2026 |
| Walbrook Management LLP | | 2010 |
| Wallis & SON Decorators Ltd | Construction | 2019 |
| Wanbad Limited | Professional & scientific | 2018 |
| Warming Limited | Real estate | 1999 |
| Waspland Limited | Administrative & support | 2009 |
| Wavelength Aesthetics Ltd | Other services | 2025 |
| WAX on WAX OFF Limited | Real estate | 2022 |
| Wayne Smith Consulting Ltd | Information & communication | 2009 |
| WB Power Engineering Limited | Construction | 2025 |
| WB Rigging Ltd | Information & communication | 2016 |
| WDE Propco Ltd | Construction | 2025 |
| WE FIX Scaffolding Limited | Construction | 2016 |
| Weald Bridge Construction Limited | Construction | 2025 |
| Weald House Limited | Construction | 2026 |
| Weald Space Ltd | Real estate | 2020 |
| Weald Travel Ltd | Administrative & support | 2022 |
| Web Wise Media Ltd | Information & communication | 2012 |
| Well in Yourself Limited | Health & social care | 2022 |
| Wellbury Properties Limited | Real estate | 2009 |
| Westblock Development Limited | Professional & scientific | 1987 |
| Western Phoenix Ltd | Hospitality | 2024 |
| Westferry Services (London) Limited | Administrative & support | 2010 |
| Westward HO Hotel Ltd | Hospitality | 2023 |
| Wetakeanywaste Limited | Water & waste | 2024 |
| Wharf Finance & Leasing Limited | Financial services | 2001 |
| Wharf Property Holdings Limited | Real estate | 2025 |
| Whisper Advisory Services Limited | Other services | 2014 |
| White Peach Estates Ltd | Real estate | 2014 |
| Whittet Books Limited | Wholesale & retail | 1964 |
| Wiesn-Daz Ltd | Hospitality | 2013 |
| William Grant Davis Ltd | Extraterritorial | 2024 |
| William Sheridan Limited | Real estate | 2026 |
| Willow Barn Properties Limited | Real estate | 2020 |
| Wimbledon Trade Ltd | Wholesale & retail | 2021 |
| Windermere Construction Limited | Real estate | 2000 |
| Window & Glazing Solutions Limited | Construction | 2015 |
| Window Maintenance Services Limited | Construction | 1999 |
| Wing Close Management Company Limited | Households | 1998 |
| Winged Developments Ltd | Construction | 2025 |
| Wings Cafe Limited | Hospitality | 2013 |
| Wink (UK) Limited | Manufacturing | 2013 |
| Wintry Mews Freehold Management Company Limited | Households | 2025 |