| Whiskey Food & Drinks 247 Limited | Wholesale & retail | 2025 |
| Whiskey Tipsy 24/7 Limited | Wholesale & retail | 2023 |
| Whistle Health Ltd | Wholesale & retail | 2023 |
| Whitby Brother’S Limited | Wholesale & retail | 2025 |
| Whitchurch Care Management Limited | Health & social care | 2020 |
| White Door Publishing Limited | Information & communication | 2018 |
| White Estates Limited | Real estate | 1987 |
| White Feather Therapies Ltd | Health & social care | 2019 |
| White Horns Farm Limited | Real estate | 2025 |
| White Lace and Butterflies Ltd | Wholesale & retail | 2016 |
| White Light Property Ltd | Real estate | 2025 |
| White Lotus Wellness Limited | Professional & scientific | 2023 |
| White Oak Finance Ltd | Professional & scientific | 2022 |
| White Orchid Holdings Limited | Financial services | 2025 |
| White Rain Designs Limited | Manufacturing | 2020 |
| White Rock Venture Capital Ltd | Financial services | 2024 |
| White Slate Limited | Professional & scientific | 2025 |
| White Stallion Limited | Construction | 2018 |
| White Swan Care Services Ltd | Health & social care | 2010 |
| White Swan Housing C.I.C. | Health & social care | 2018 |
| White Tree Design London Ltd | Wholesale & retail | 2026 |
| White View Consulting Limited | Information & communication | 2013 |
| White's Cleaning (London) Ltd | Administrative & support | 2016 |
| Whitefin IT Services Ltd | Information & communication | 2010 |
| Whiteforce Global Ltd | Professional & scientific | 2020 |
| Whitehouse Common Limited | Wholesale & retail | 2015 |
| Whitehouse Sutton Limited | Wholesale & retail | 2019 |
| Whiteline Plus Ltd | Construction | 2025 |
| Whiteman Consulting Limited | Financial services | 2013 |
| Whitemill Properties Limited | Other services | 2004 |
| Whitesky Grosvenor Limited | Real estate | 2022 |
| Whitespase Consulting Limited | Information & communication | 2017 |
| Whitetops Global Ltd | Information & communication | 2025 |
| Whitewood Estate Agents Limited | Real estate | 2019 |
| Whitmore Consulting Limited | Professional & scientific | 2004 |
| Whitnat Ltd | Health & social care | 2022 |
| Whitstable Food and Wine Ltd | Wholesale & retail | 2025 |
| Whitton Accountants Limited | Professional & scientific | 2024 |
| Whiz Solutions Ltd | Information & communication | 2008 |
| Whizworld Ltd | Wholesale & retail | 2019 |
| Whizz Enterprises UK Ltd | Wholesale & retail | 2016 |
| Whmk Group Limited | Information & communication | 2023 |
| WHO IS Hussain Limited | Health & social care | 2015 |
| Wholesale Phone Supplies Limited | Wholesale & retail | 2025 |
| Whyre Limited | Financial services | 2020 |
| Whyteleafe Padel Limited | Wholesale & retail | 2025 |
| Wibe Properties Ltd | Real estate | 2021 |
| Wicazo Ltd | Wholesale & retail | 2023 |
| Wick London Limited | Wholesale & retail | 2017 |
| Wickfields (Longwick) Management Company Limited | Households | 2018 |
| Wickgrove Limited | Wholesale & retail | 2001 |
| Wicksted Developments Ltd | Real estate | 2019 |
| Widcombe Dispensing Limited | Wholesale & retail | 2009 |
| Wide Fit Shoes Limited | Wholesale & retail | 2006 |
| Wide Range Electrical Ltd | Construction | 2025 |
| Wideview Construction Ltd Ltd | Construction | 2026 |
| Wiggins Estates Limited | Construction | 2016 |
| Wiggins Group Limited | Administrative & support | 2010 |
| Wiggins Industries Limited | Financial services | 2015 |
| Wiggins Services Limited | Construction | 2007 |
| Wiit Digital UK Limited | Information & communication | 2022 |
| Wikitoria Limited | Other services | 2012 |
| Wilaya Investment Management Ltd | Financial services | 2018 |
| Wilburton Flame Limited | Transport & logistics | 2012 |
| Wild Roots Collective Ltd | Wholesale & retail | 2025 |
| Wild Smiles Ltd | Health & social care | 2018 |
| Wild Vikings Ltd | Other services | 2022 |
| Wildcats Combat Ltd | Education | 2019 |
| Wildpress Juice Ltd | Wholesale & retail | 2019 |
| Wilford Close Residents Association Limited | Households | 1981 |
| Wilkins Hunter Limited | Administrative & support | 2015 |
| Wilkins Hunter Property Limited | Real estate | 2021 |
| Wilkinson Enterprises Limited | Real estate | 2003 |
| Will Minting Ltd | Professional & scientific | 2019 |
| Willemstad Group Limited | Other services | 2018 |
| William Developments Halifax Limited | Construction | 2015 |
| William Dunhill Estates Limited | Real estate | 2020 |
| William Ewing Ltd | Real estate | 2016 |
| William James Management Limited | Professional & scientific | 2013 |
| William Stevens Financial Services Limited | Financial services | 2019 |
| Williams Building Company (22) Limited | Construction | 2007 |
| Williams Chauffeurs of London Ltd | Transport & logistics | 2020 |
| Williejohn Limited | Professional & scientific | 2005 |
| Willomet Fulham Limited | Hospitality | 2026 |
| Willotel Wimbledon Limited | Hospitality | 2025 |
| Willow Court (Harrow) Limited | Hospitality | 1997 |
| Willow Court Management Company (1985) Limited | Households | 1985 |
| Willow Elite Cleaning Services Ltd | Administrative & support | 2020 |
| Willow Fabrications Limited | Administrative & support | 2024 |
| Willow Homes Group Limited | Health & social care | 2025 |
| Willow Tree Investments Limited | Real estate | 1999 |
| Willow Tree Lane Hayes Management Limited | Households | 1991 |
| Willow's Rentals Limited | Real estate | 2025 |
| Willowbatch Consulting Limited | Administrative & support | 2023 |
| Willowend Limited | Construction | 2004 |
| Willowgate Group Ltd | Financial services | 2025 |
| Willowlease Limited | Households | 1991 |
| Willows Parks Estates Limited | Hospitality | 2024 |
| Willstone Properties Ltd | Real estate | 2010 |
| Wilson & Callaghan Limited | Professional & scientific | 2007 |