| VSV Consulting Ltd | Professional & scientific | 2021 |
| VT Technical Solutions Ltd | Information & communication | 2024 |
| VTP Holdings Ltd | Professional & scientific | 2015 |
| Vural Logistics Limited | Transport & logistics | 2019 |
| VVA Construction Limited | Professional & scientific | 2015 |
| VVB Estates LLP | | 2007 |
| VVM Systems Ltd. | Other services | 2007 |
| VW Doctor (Watford) Ltd | Wholesale & retail | 2019 |
| Vyas Wealth Management Limited | Professional & scientific | 2025 |
| Vybecafe Ltd | Hospitality | 2026 |
| VYM Limited | Hospitality | 2023 |
| Vyma Ltd | Real estate | 2023 |
| Vyzn Ltd | Wholesale & retail | 2025 |
| W Ferris Building & Landscaping Services Ltd | Administrative & support | 2022 |
| W.A.C Electrics Ltd | Construction | 2023 |
| W.E. Wright & Sons (Chesham) Limited | Wholesale & retail | 1947 |
| W.H. Lavers & Sons Limited | Real estate | 1930 |
| W.M.S. Car & Commercial Limited | Wholesale & retail | 2008 |
| W.S. Electrical Services Limited | Construction | 2002 |
| W14 Contracts Ltd | Construction | 2022 |
| W6 Resources Limited | Administrative & support | 2020 |
| W85 Ltd | Construction | 2018 |
| WA AC Refrigeration Limited | Manufacturing | 2016 |
| Wagcon Limited | Professional & scientific | 2013 |
| Wahid Coaching International Ltd | Professional & scientific | 2024 |
| WAI Limited | Professional & scientific | 2024 |
| Waine Enterprises Limited | Financial services | 2017 |
| Wakusei Ltd | Hospitality | 2021 |
| Walk the Floor Ltd | Professional & scientific | 2024 |
| Walker Publicity Prints Limited | Manufacturing | 1972 |
| Wall Flex Limited | Wholesale & retail | 2024 |
| Wallco Investments Limited | Administrative & support | 2006 |
| Wallick Online Marketing Limited | Information & communication | 2022 |
| Wallis Townshend Legal Services Limited | Professional & scientific | 2016 |
| Wallow Mallow Limited | Information & communication | 2026 |
| Walsh & Mcgrath Funeral Directors Ltd | Other services | 2019 |
| Walsh Carpentry & Construction Ltd | Construction | 2026 |
| Waltec Solutions Limited | Information & communication | 2010 |
| Walter Elliot Limited | Wholesale & retail | 2024 |
| Walton Suites Ltd | Households | 2026 |
| WAM Solutions Ltd | Professional & scientific | 2023 |
| Wandering Martini Limited | Wholesale & retail | 2026 |
| Waqar Collects Ltd | Wholesale & retail | 2026 |
| Wardio Ltd | Information & communication | 2026 |
| Wargrave Consulting Limited | Professional & scientific | 2015 |
| Warneford Place (Management) Company Limited | Households | 2004 |
| Warren Hill Mansion Amenity Limited | Real estate | 1976 |
| Warrick Group Limited | Construction | 2021 |
| WASHER4YOU Limited | Other services | 2019 |
| Waste Disposal UK Ltd | Administrative & support | 2019 |
| WAT REF Holdings Limited | Financial services | 2024 |
| Watan Tooting Ltd | Hospitality | 2021 |
| Waterdale House Ltd | Real estate | 2024 |
| Waterford Development (Property) Limited | Real estate | 2026 |
| Waterford Development Limited | Construction | 2006 |
| Waterford Group Holdings Limited | Financial services | 2026 |
| Waterman Chase Investments Ltd | Real estate | 2019 |
| Waters Contracting Ltd | Construction | 2024 |
| Watertight Roofing Limited | Construction | 2003 |
| Watfieldway Properties Limited | Real estate | 2024 |
| Watford 3PL Ltd | Transport & logistics | 2021 |
| Watford Accountancy Limited | Professional & scientific | 2020 |
| Watford Aesthetics Hub Limited | Households | 2024 |
| Watford African Caribbean Association | Other services | 2011 |
| Watford and District Classic Vehicle Trust Limited | Extraterritorial | 2000 |
| Watford and District Mencap Society | Health & social care | 1991 |
| Watford Auto Service Limited | Wholesale & retail | 2019 |
| Watford Autotrust Ltd | Wholesale & retail | 2021 |
| Watford Barbers Ltd | Other services | 2025 |
| Watford BID Limited | Other services | 2015 |
| Watford Boiler Repair Ltd | Construction | 2025 |
| Watford Brake and Clutch Services Limited | Wholesale & retail | 2024 |
| Watford Builders Limited | Extraterritorial | 1974 |
| Watford Cars 4 Sale Ltd | Wholesale & retail | 2021 |
| Watford Commercial Services Limited | Administrative & support | 2016 |
| Watford Construction Limited | Construction | 2025 |
| Watford Cycle Hub Limited | Wholesale & retail | 2012 |
| Watford Cycle Hub Trading Ltd | Wholesale & retail | 2026 |
| Watford Dragon Garden Chinese Food Limited | Hospitality | 2023 |
| Watford Drylining & Interiors Ltd | Construction | 2021 |
| Watford Education Centre Limited | Education | 2024 |
| Watford Exterior Cleaning Co Limited | Administrative & support | 2026 |
| Watford FC Women Limited | Arts & recreation | 2013 |
| Watford Fc's Community Sports & Education Trust | Education | 2003 |
| Watford Flat Roofing Limited | Construction | 2026 |
| Watford Gracie Jiu-Jitsu LLP | | 2017 |
| Watford Grammar School for Boys | Education | 2010 |
| Watford Grammar School for Boys Enterprises Limited | Administrative & support | 2017 |
| Watford Grammar School for Girls | Education | 2010 |
| Watford Grammar School for Girls Services Ltd | Education | 2013 |
| Watford Grill Chicken Ltd | Hospitality | 2026 |
| Watford Hair and Beauty Limited | Wholesale & retail | 2017 |
| Watford Healthcare Consulting Limited | Health & social care | 2012 |
| Watford Heath Residents Association Limited | Households | 1973 |
| Watford Hindu Group | Other services | 2011 |
| Watford Home Improvements Ltd | Construction | 2026 |
| Watford Home Store Limited | Wholesale & retail | 2022 |
| Watford INK Ltd | Other services | 2023 |
| Watford Interiors Ltd | Construction | 2024 |
| Watford Islamic Funeral Services Limited | Other services | 2026 |