| Trush Technics Ltd | Information & communication | 2007 |
| Trust Lettings Limited | Real estate | 2005 |
| Tryfor Ltd | Professional & scientific | 2007 |
| TSC and HLG Limited | Real estate | 2021 |
| TTM (UK) Limited | Real estate | 2005 |
| Tubular Artistes London Limited | Wholesale & retail | 1987 |
| Tuck in Properties Limited | Hospitality | 2005 |
| Tudor Investments Limited | Real estate | 1999 |
| Tudortile Limited | Real estate | 1985 |
| Turbowood Limited | Construction | 1995 |
| Turner Properties Limited | Real estate | 1986 |
| Turnex Tools Limited | Manufacturing | 1992 |
| TV Plumbing and Mechanical Services Limited | Construction | 1999 |
| Twelve Hampton Road Limited | Households | 2005 |
| Twickenham Scientific Instruments Limited | Manufacturing | 1994 |
| Twickers Tots Limited | Health & social care | 2007 |
| Twisted Sun Ltd | Other services | 2015 |
| Twocan Graphics Limited | Other services | 2009 |
| TYE Associates Ltd | Arts & recreation | 2023 |
| Tynebridge Limited | | 1975 |
| Tyremen London Limited | Professional & scientific | 2005 |
| Tyremen UK Limited | Wholesale & retail | 2005 |
| U & I Vision Ltd | Other services | 2003 |
| U-Excel Trade Ltd | Wholesale & retail | 2021 |
| Uberpup Limited | Arts & recreation | 2005 |
| UK Paving Stone Supplies Limited | Wholesale & retail | 2024 |
| UK Spice and Ingredients Ltd | Construction | 2005 |
| Ukay Khoa Manufacturing Limited | Manufacturing | 1994 |
| Ullswater Court (Rayners Lane) Management Limited | Households | 1991 |
| Ultimate Precision Engineering (UK) Limited | Manufacturing | 2004 |
| Ultramatic Limited | Information & communication | 1986 |
| Ultrasoft Technologies Limited | Information & communication | 1998 |
| Umiya Property Investments Limited | Real estate | 2000 |
| UML Bondi Limited | Transport & logistics | 2019 |
| UNA Tickets Ltd | Administrative & support | 2014 |
| Uneek Freight Services Limited | Transport & logistics | 1978 |
| Union News, Food & Wine Limited | Wholesale & retail | 2007 |
| Unique Distributions Limited | Extraterritorial | 2005 |
| Unique Visions Limited | Administrative & support | 1997 |
| Unique Windows Limited | Manufacturing | 1999 |
| Unitaspect Property Management Limited | Households | 1996 |
| United Business Xpress Limited | Transport & logistics | 2003 |
| United Communications Trustees Limited | Financial services | 1990 |
| United Trading Company (Europe) Limited | Transport & logistics | 2006 |
| Univar International Ltd | Administrative & support | 1973 |
| Universal Dispense Systems Limited | Manufacturing | 2003 |
| Universal Meetings Limited | Education | 2003 |
| Universal Programming Limited | Information & communication | 1997 |
| Unoxia Limited | | 1975 |
| Urban Industry Limited | Wholesale & retail | 2003 |
| Urban Tropics Limited | Administrative & support | 2002 |
| Urbanline Development Limited | Construction | 2026 |
| Urce Catering Equipment Ltd | Wholesale & retail | 2017 |
| V a Vishnu & Co Limited | Real estate | 2002 |
| V S Services Limited | Health & social care | 2005 |
| V.J. Carpets Limited | Wholesale & retail | 1996 |
| V.P.R. Systems Limited | Professional & scientific | 1983 |
| Valdeuk Limited | Administrative & support | 2007 |
| Valdoncourt Limited | Professional & scientific | 1991 |
| Valentine of London Limited | Wholesale & retail | 1989 |
| Valid Management Group Ltd | Transport & logistics | 2024 |
| Valradio Electronics Limited | Manufacturing | 1995 |
| Van Wonderen Flowers Limited | Wholesale & retail | 2007 |
| Vandercom Media Group Ltd | Information & communication | 2023 |
| Vanessas Tutoring Limited | Education | 2025 |
| Vanguard Interiors (UK) Limited | Extraterritorial | 2000 |
| Vanslow Properties Limited | Financial services | 2001 |
| Vantage Facilities Limited | Construction | 1998 |
| Vantage Motors Limited | Information & communication | 1980 |
| Vaquancy Ltd | Administrative & support | 2021 |
| Variety Silk House Limited | Wholesale & retail | 1984 |
| Varley Limited | Other services | 1972 |
| Varsani Aesthetics Ltd | Health & social care | 2021 |
| Vash Properties Limited | Real estate | 2006 |
| Vaughan Road Management Company Limited | Households | 2002 |
| VB Capital Ltd | Extraterritorial | 2017 |
| VBL Enterprise Ltd | Real estate | 1995 |
| Vdbm Limited | Professional & scientific | 2006 |
| Vectis Veritas Ltd | Professional & scientific | 2008 |
| Velji Bhovan & Sons (Trading) Limited | Wholesale & retail | 2002 |
| Veltom Hill Limited | Education | 2006 |
| Vena Blood Clinic Ltd | Health & social care | 2026 |
| Venus Music & Records Limited | Information & communication | 2000 |
| Verapath Limited | Information & communication | 2026 |
| Verdi Systems Limited | Construction | 2001 |
| Veritest Limited | Information & communication | 2003 |
| Verona Films Limited | Information & communication | 2009 |
| Versi Associates Limited | Professional & scientific | 2004 |
| Vesta Residential Limited | Real estate | 2017 |
| VI Solutions (UK) Limited | Extraterritorial | 2004 |
| Vianova European Buyout 2004 L.P. | | 2005 |
| Vibes Management Limited | Other services | 2024 |
| Viceroy Investments Limited | Administrative & support | 1947 |
| Vicky Addo Limited | Information & communication | 2007 |
| Vicsons Limited | Wholesale & retail | 1992 |
| Victoria Elizabeth Properties Limited | Real estate | 1979 |
| Victoria Holt FX Limited | Arts & recreation | 2013 |
| Victoria Watts Limited | Information & communication | 2012 |
| Viewpoint Connections Limited | Information & communication | 2005 |
| Vignan Corp Ltd | Wholesale & retail | 2024 |