| Translink Pacific Limited | Wholesale & retail | 1994 |
| Travel Option Limited | Administrative & support | 1997 |
| Travel Power Limited | Information & communication | 2005 |
| Treasure UN- Limited | Professional & scientific | 2006 |
| Tree Solutions Arboriculture Limited | Administrative & support | 2006 |
| Treloar Technologies Ltd | Information & communication | 1999 |
| Trenkgreen Limited | Information & communication | 2007 |
| Trent Property Services Limited | Real estate | 1996 |
| Treston Limited | Wholesale & retail | 1985 |
| Trevor Sutton Limited | Administrative & support | 2003 |
| Trilogy Business Systems Limited | Professional & scientific | 1999 |
| Trinity Controls Limited | Construction | 2002 |
| Trinom Solutions Limited | Information & communication | 2014 |
| Tripdent Limited | Health & social care | 2017 |
| Tropimere Manufacturing Limited | | 1980 |
| Truline Systems Limited | Manufacturing | 2023 |
| Trust for Sustainable Living | Education | 2000 |
| TSI Healthcare Ltd | Health & social care | 2018 |
| Tudor Builders (Slough) Limited | Wholesale & retail | 1987 |
| Tunes Limited | Wholesale & retail | 2000 |
| Tvas (Property) Limited | Real estate | 2007 |
| Twentyfive Fencing Limited | Administrative & support | 2019 |
| Two Consulting LLP | | 2002 |
| Twofold Limited | Manufacturing | 2000 |
| Twyford Polo Club Limited | Arts & recreation | 2018 |
| UC Solutions Inc Ltd | Other services | 2017 |
| UCB (Investments) Limited | Professional & scientific | 1973 |
| UCB Pharma Limited | Manufacturing | 1925 |
| UK Debt Collection Limited | Information & communication | 2000 |
| UKS Cooling Limited | Construction | 2019 |
| Ultimat Limited | Manufacturing | 2004 |
| UNA (England) Ltd | Real estate | 2005 |
| Unimac Engineering Limited | Manufacturing | 2007 |
| Unimaster Hydraulics Ltd | Manufacturing | 2003 |
| Unipath Limited | Administrative & support | 1946 |
| Unit 42 Limited | Wholesale & retail | 1987 |
| Universal Materials Company Limited | Transport & logistics | 1943 |
| Universal Networks UK Limited | Manufacturing | 2002 |
| Upm-Kymmene Wood Limited | Extraterritorial | 1972 |
| Upright Financial Services Ltd | Professional & scientific | 2005 |
| Upton Park Roads,Limited | Construction | 1932 |
| Vama Cucine UK Limited | Wholesale & retail | 2008 |
| Vansh Enterprise Limited | Hospitality | 2015 |
| Velmead Homes Limited | Real estate | 1997 |
| Velocity Performance Cars Limited | Wholesale & retail | 2014 |
| Vexseal Limited | Professional & scientific | 2002 |
| VIA Sameday Limited | Extraterritorial | 1991 |
| Vibrantz Ltd | Manufacturing | 2021 |
| Vicars Game Limited | Manufacturing | 1995 |
| Victoria ANN Consulting Group Ltd | Administrative & support | 2022 |
| Vikas Haridas Limited | Information & communication | 2018 |
| Village Financial Services Limited | Financial services | 2002 |
| Villasita.Com Limited | Professional & scientific | 2007 |
| Vilmorin Limited | Professional & scientific | 2004 |
| Vishal News Ltd | Wholesale & retail | 2025 |
| Visionselect Limited | Wholesale & retail | 1998 |
| Visionselect Properties Limited | Real estate | 2004 |
| Vmos Limited | Other services | 2006 |
| Vulcan Motors Limited | Wholesale & retail | 1993 |
| W & M Plumbing and Heating Limited | Construction | 2007 |
| W a Forbes Property Limited | Construction | 2007 |
| W H Internet Limited | Information & communication | 2006 |
| W.A. Crofton Limited | Extraterritorial | 1978 |
| Wako GB Limited | Arts & recreation | 2021 |
| Walson Developments Limited | Construction | 2002 |
| Warfield Homes Ltd | Real estate | 2003 |
| Warren House Investments Limited | Construction | 1994 |
| Waterman Residential Lettings Limited | Real estate | 2000 |
| Wavegate Technologies Limited | Professional & scientific | 2005 |
| Way to Save Food & Wine Limited | Wholesale & retail | 2006 |
| Websentient Ltd | Professional & scientific | 2003 |
| Weld Ability Limited | Transport & logistics | 1995 |
| Wellesley Secured Property Finance Limited Partnership | | 2006 |
| Wellington (Hardwicks) Limited Partnership | | 2006 |
| Wellington College Services Ltd | Arts & recreation | 1976 |
| Wellington Investment Three Limited Partnership | | 2007 |
| Wellington Investment Two Limited Partnership | | 2007 |
| Wellquick Ltd | Health & social care | 1999 |
| Wessex Investment Holdings Limited | Administrative & support | 2007 |
| Wessex Pharmacy Limited | Wholesale & retail | 2003 |
| Westerleigh Properties Limited | Construction | 1994 |
| Westwind Management Solutions Limited | Professional & scientific | 1988 |
| Whippy World Limited | Manufacturing | 2026 |
| Whyte and Wood Ltd | Manufacturing | 2017 |
| Wildlife Control Services Limited | Agriculture & fishing | 1995 |
| Willstow Chemicals (U.K.) Limited | | 1980 |
| Wilson Software Consultancy Ltd | Information & communication | 2002 |
| Windsor & Regional Properties Limited | Real estate | 1988 |
| Windsor Drive (High Wycombe) Freehold Limited | Households | 2003 |
| Winmorebids Limited | Professional & scientific | 2005 |
| Winning Process Solutions Ltd | Professional & scientific | 2022 |
| Wokingham Day Nursery | Health & social care | 2007 |
| Wokingham Theatre | Arts & recreation | 1985 |
| Wokingham United Charities | Health & social care | 2004 |
| Wolseley Pension Trustees Limited | Extraterritorial | 1981 |
| Wong Family Ltd | Hospitality | 2023 |
| Woodhill House,Crowthorne Management Company Limited | Households | 1988 |
| World Education Berkshire | Hospitality | 1986 |
| Worthy Builders (Reading) Limited | Construction | 1992 |
| WPD5 Limited | Construction | 2017 |