| Weston Facilities Limited | Administrative & support | 1996 |
| Weston Limited | Wholesale & retail | 1998 |
| Westown Investment Limited | Financial services | 2009 |
| Westridge Consultants Ltd | Education | 2024 |
| Westrow Building Services Limited | Construction | 2016 |
| Westrow Enterprise Ltd | Real estate | 2020 |
| Westrow Foods Ltd | Wholesale & retail | 2021 |
| Westvale Limited | Wholesale & retail | 1989 |
| Westview Essex Limited | Real estate | 2020 |
| Westwood Construction Services Ltd | Construction | 2022 |
| Westwood Motors Limited | Wholesale & retail | 2026 |
| Westwood Road Ltd | Real estate | 2024 |
| Westwood Software Limited | Information & communication | 2004 |
| WET Wall Master Ltd | Wholesale & retail | 2026 |
| Wetax Ltd | Professional & scientific | 2021 |
| Wetrendytraders Limited | Wholesale & retail | 2024 |
| Wevisa Ltd | Education | 2025 |
| Wexford Solution Ltd | Wholesale & retail | 2025 |
| Weybridge Property Investment Ltd | Real estate | 2014 |
| Weymouth Capital Ltd | Real estate | 2026 |
| Weymouth Properties Limited | Real estate | 2024 |
| Weymouth Trading Ltd | Real estate | 2020 |
| WFK Caribbean Cuisine Limited | Hospitality | 2024 |
| WFL Ducting Ltd | Construction | 2018 |
| WG Planning Engineering Consultancy Limited | Construction | 2022 |
| Whalebone Associates Limited | Professional & scientific | 2021 |
| Whales' Group Private Ltd | Hospitality | 2026 |
| Whames Eyecare Services Limited | Health & social care | 2019 |
| Wharf Construction Recruitment Limited | Administrative & support | 2014 |
| What Street? Limited | Hospitality | 2022 |
| Wheel Warriors Ltd | Wholesale & retail | 2024 |
| Wheelosity Limited | Wholesale & retail | 2020 |
| Wheelpartsdirect Ltd | Wholesale & retail | 2019 |
| Wheelque Hire Management Limited | Wholesale & retail | 2023 |
| Wheels Club Ltd | Wholesale & retail | 2024 |
| Wheels for Less Limited | Wholesale & retail | 2017 |
| Wheels Movers Ltd | Wholesale & retail | 2022 |
| Whimsy World Ltd | Extraterritorial | 2024 |
| Whip-E Events Ltd | Wholesale & retail | 2015 |
| Whipitupevents Ltd | Arts & recreation | 2025 |
| Whippendell Healthcare Limited | Wholesale & retail | 2003 |
| Whippwater Ltd | Administrative & support | 2011 |
| Whippy Time Ltd | Hospitality | 2023 |
| Whipsmart Limited | Administrative & support | 2023 |
| Whisky Heaven Ltd | Wholesale & retail | 2019 |
| Whistle & Humm London Limited | Other services | 2019 |
| White Cloud Constructions Ltd | Construction | 2025 |
| White Elephant Trading Ltd | Wholesale & retail | 2014 |
| White Falcon Developments Ltd | Real estate | 2024 |
| White FOX Hoodies Limited | Wholesale & retail | 2025 |
| White Gables Care Limited | Health & social care | 2017 |
| White Image Ltd | Wholesale & retail | 2023 |
| White Jewel Limited | Professional & scientific | 2004 |
| White Lion Concepts Ltd | Construction | 2025 |
| White Lotus Investments Ltd | Real estate | 2022 |
| White Nile Capital Limited | Administrative & support | 2019 |
| White Orchard Property Management Limited | Real estate | 2022 |
| White Pebbles Ltd | Wholesale & retail | 2006 |
| White Post Lane Development LLP | | 2024 |
| White Secure Properties Limited | Real estate | 2017 |
| White Wash Drycleaners Ltd | Other services | 2025 |
| Whiteboard Shop Limited | Wholesale & retail | 2015 |
| Whitecastle Trading Limited | Arts & recreation | 2020 |
| Whitehall IT (London) Limited | Information & communication | 2012 |
| Whitehall Souvenirs Ltd | Wholesale & retail | 2023 |
| Whitemor Carters Limited | Information & communication | 2023 |
| Whitesky Homes Limited | Real estate | 2023 |
| Whitesky Living Ltd | Real estate | 2025 |
| Whitesky Properties Ltd | Real estate | 2024 |
| Whitestone (Essex) Limited | Administrative & support | 2011 |
| Whitewaves Laundry Limited | Other services | 2024 |
| Whitmore 2025 Ltd | Professional & scientific | 2025 |
| Whitmore Properties Ltd | Real estate | 2024 |
| Whittaker's Holdings Ltd. | Real estate | 2023 |
| Whittley Scaffolding Services Limited | Construction | 1997 |
| Wholesale Auto Parts Ltd | Wholesale & retail | 2022 |
| Wholesale Direct Comercial Limited | Wholesale & retail | 2025 |
| Wholesale Direct Suppliers Limited | Wholesale & retail | 2025 |
| Wholesale Drop Shop Ltd | Wholesale & retail | 2025 |
| Wholesale Meat Supply Limited | Wholesale & retail | 2026 |
| Wholestar Ltd | Wholesale & retail | 2025 |
| Whybe Creates Limited | Information & communication | 2021 |
| Wicklow Investment Ventures Ltd | Construction | 2024 |
| Wicko General Trading Limited | Other services | 2017 |
| WIG Mania Ltd | Wholesale & retail | 2022 |
| Wigmore Enterprises Limited | Professional & scientific | 2025 |
| Wigmore Realty Limited | Real estate | 2022 |
| Wiki Publishing Services Ltd | Manufacturing | 2026 |
| Wild Communities CIC | Education | 2026 |
| Wildeats Ltd | Administrative & support | 2026 |
| Wildiz Ltd | Education | 2025 |
| Willco Developments Limited | Construction | 2008 |
| Willesden Hills Ltd | Financial services | 2020 |
| William Benson Trading Limited | Wholesale & retail | 2025 |
| William Finch Limited | Real estate | 2020 |
| William Gregor Limited | Administrative & support | 2001 |
| William Trading Company UK Limited | Wholesale & retail | 2019 |
| William Vale Properties Ltd | Real estate | 2024 |
| Williams Farm Foods Limited | Manufacturing | 2025 |
| Willoughby Paddocks Ltd | Real estate | 2019 |