| Waltz and Hall Limited | Professional & scientific | 2003 |
| WAM Property Ltd | Real estate | 2022 |
| Wamikaa Jewellery Ltd | Wholesale & retail | 2025 |
| Wandering Faqir Ltd | Wholesale & retail | 2024 |
| Wanderkeys Ltd | Hospitality | 2025 |
| Wanderland Property Management Ltd | Real estate | 2022 |
| Wani Sparks Ltd | Administrative & support | 2023 |
| WAR Paint Mens Grooming Ltd | Other services | 2017 |
| Ward Creative Limited | Arts & recreation | 2024 |
| Ward Holdings D and N Limited | Financial services | 2024 |
| Ward-Young Holdings Limited | | 1976 |
| Warden Industries Ltd | Extraterritorial | 2011 |
| Wardrobe Court Limited | Real estate | 1948 |
| Wardrobe Place Limited | Real estate | 1950 |
| Warespace Harrow Ltd | Real estate | 2022 |
| Warm Heart Care Ltd | Health & social care | 2026 |
| Warmahome Properties Limited | Real estate | 2022 |
| Warp & Weft (UK) Limited | Wholesale & retail | 2004 |
| Warren Powell-Richards Limited | Real estate | 2008 |
| Warren Stickley Services Ltd | Information & communication | 2017 |
| Warrenden Limited | Real estate | 1997 |
| Warrgyizmorsch UK Ltd | Information & communication | 2025 |
| Warrick Property Ltd | Real estate | 2025 |
| Warrington RD Endeavour Management Company Ltd | Real estate | 2018 |
| Warsi Charcoal Ltd | Hospitality | 2024 |
| Warsi Halal Meat Limited | Administrative & support | 2001 |
| Warwick Business Solutions Limited | Professional & scientific | 1999 |
| Warwick Digital Services Ltd | Information & communication | 2026 |
| Warwick Park Care Home Limited | Administrative & support | 2010 |
| Warwick Park Dental Surgery Limited | Health & social care | 2015 |
| Warwick Secretary Limited | Professional & scientific | 2001 |
| WASH2KLEEN Ltd | Other services | 2023 |
| Washoku Food Group Ltd | Hospitality | 2018 |
| Washy Ltd | Other services | 2025 |
| Waste OIL Ltd | Manufacturing | 2025 |
| Wasu Property Investments Limited | | 2013 |
| Watan Wheels Ltd | Information & communication | 2026 |
| Watandar Snap Ltd | Information & communication | 2026 |
| Watch Master UK Limited | Other services | 2019 |
| Watch Maxx Ltd | Other services | 2025 |
| Watchbattery (UK) Limited | Wholesale & retail | 2006 |
| Watchmax Limited | Wholesale & retail | 2014 |
| Watchtower FM Ltd | Administrative & support | 2025 |
| Water Mirror Ltd | Manufacturing | 2021 |
| Water UP Limited | Professional & scientific | 2016 |
| Watergate AI Limited | Information & communication | 2023 |
| Waterglades Management Limited | Households | 1987 |
| Watermead Ltd | Health & social care | 2012 |
| Waterside Block Limited | Households | 2025 |
| Watford Food Culture Limited | Hospitality | 2025 |
| Watford Heath Farm Limited | Households | 1961 |
| Watford Optical Ltd | Wholesale & retail | 2021 |
| Watford Plant Limited | Administrative & support | 2018 |
| Watford Smiles Limited | Administrative & support | 2014 |
| Watt Handyman Limited | Construction | 2016 |
| Wattan Holdings Limited | Real estate | 2024 |
| Wave Factor Limited | Financial services | 2021 |
| Wave Storm Limited | Wholesale & retail | 2025 |
| Wavendon Residential Properties LLP | | 2009 |
| Waverley G. Limited | Manufacturing | 2014 |
| Waves & Wings Ltd | Hospitality | 2026 |
| Waves Care Ltd | Health & social care | 2022 |
| Wayed Ltd | Other services | 2022 |
| Wayne Property Ltd | Real estate | 2023 |
| Wayside Development Company (Aldenham) Limited | Real estate | 1958 |
| Wayside Paving Ltd | Construction | 2018 |
| WB Building Contractors Limited | Construction | 2012 |
| WCS Healthcare (UK) Limited | Professional & scientific | 2003 |
| WD Engineering Ltd | Professional & scientific | 2025 |
| WD Property Maintenance Limited | Construction | 2023 |
| WD UK Investments Limited | Professional & scientific | 2016 |
| WD4 Ltd | Administrative & support | 2024 |
| WDC Property Ltd | Real estate | 2026 |
| WDC75 Limited | Real estate | 2022 |
| WDP Communications Limited | Manufacturing | 2021 |
| WE ARE Apollo Five Limited | Administrative & support | 2019 |
| WE ARE Attune Ltd | Arts & recreation | 2019 |
| WE ARE Bard Management Limited | Information & communication | 2012 |
| WE ARE High END Limited | Wholesale & retail | 2025 |
| WE ARE Tapestry Ltd | Professional & scientific | 2026 |
| WE ARE Watchmen Ltd | Information & communication | 2024 |
| WE ARE YOU Press Ltd | Manufacturing | 2025 |
| WE Banishing Limited | Information & communication | 2018 |
| WE Buy ANY Property and Land Ltd | Real estate | 2024 |
| WE Define Limited | Wholesale & retail | 2023 |
| WE Drinks Cash& Carry 24/7 Ltd | Wholesale & retail | 2023 |
| WE GOT Maids Ltd | Administrative & support | 2021 |
| WE Know Roofing Limited | Construction | 2022 |
| WE Love Food Limited | Wholesale & retail | 2007 |
| WE Need to Chat Limited | Professional & scientific | 2012 |
| WE Tech Robo Limited | Information & communication | 2026 |
| WE Wants IT NOW Ltd | Real estate | 2022 |
| WE4 Logistics Ltd | Transport & logistics | 2026 |
| Wealdstone (Harrow) Property Limited | Real estate | 2017 |
| Wealdstone Nails and Beauty Ltd | Other services | 2023 |
| Wealdstone Supermarket Ltd | Wholesale & retail | 2015 |
| Wealth Financial Services Ltd | Financial services | 2023 |
| Wealthbyte Ltd | Information & communication | 2025 |
| Wearebadlands Ltd | Information & communication | 2020 |
| Wearemillen Ltd | Real estate | 2023 |