| Wembley Park Montessori Ltd | Education | 2017 |
| Wendela Residents Association Limited | Households | 1967 |
| Wendy's Bakes Ltd | Hospitality | 2023 |
| West Central Partners Ltd | Financial services | 2024 |
| West House Partnership Ltd | Health & social care | 2017 |
| West Industrial Company Limited | Professional & scientific | 2026 |
| West London Gazette Ltd | Manufacturing | 2026 |
| West London Health Ltd | Health & social care | 2022 |
| West London Media Limited | Information & communication | 2013 |
| West London News Limited | Information & communication | 2024 |
| West London Packaging Limited | Other services | 2025 |
| West Square Smiles Limited | Health & social care | 2025 |
| West TEN Publishing Ltd | Information & communication | 2015 |
| Westbury Logistics Limited | Transport & logistics | 2025 |
| Westbury Publishing Limited | Wholesale & retail | 2026 |
| Westcombe House Leases Limited | Real estate | 2025 |
| Westcroft Financial Ltd | Financial services | 2016 |
| Westfold Limited | Financial services | 2009 |
| Westgate Ventures Limited | Financial services | 2013 |
| Westland Medical Services Ltd | Wholesale & retail | 2023 |
| Westlands Capital Ltd | Real estate | 2025 |
| Westmidian Limited | Wholesale & retail | 1983 |
| Westmount Real Estate Ltd | Real estate | 2013 |
| Westridge Cleaning Ltd | Administrative & support | 2021 |
| Westside GAS Services Ltd | Professional & scientific | 2021 |
| Westwick Estates Ltd | Real estate | 2020 |
| Wetherill Consulting Ltd | Information & communication | 2014 |
| WFX 127 Limited | Households | 1998 |
| Wgdc Limited | Health & social care | 2011 |
| WH & Family Investments Ltd | Real estate | 2024 |
| What Work Career Coaching Ltd | Professional & scientific | 2019 |
| Wheatley Cleaners Ltd | Administrative & support | 2015 |
| White Lion FX Ltd | Information & communication | 2014 |
| White Shine Investments UK Limited | Real estate | 2021 |
| White&Co Carpentry Ltd | Manufacturing | 2023 |
| Whitefriars Property & Asset Management Limited | Real estate | 2000 |
| Whitely Residential Lettings Ltd | Real estate | 2018 |
| Whitepunch Ltd | Wholesale & retail | 2011 |
| Whitmore Solutions Group Ltd | Professional & scientific | 2026 |
| Whun TU Ltd | Information & communication | 2008 |
| Wick-It Limited | Extraterritorial | 2014 |
| Wickes House Management Limited | Real estate | 1984 |
| Wide Grove Limited | Wholesale & retail | 2024 |
| Widenham Close Residents Association Limited | Households | 1979 |
| Wigmore Aesthetics Ltd | Health & social care | 2022 |
| Wilbourne Group Holdings Ltd | Financial services | 2026 |
| Wilbourne Ltd | Information & communication | 2018 |
| Wilbourne Wealth Management Ltd | Financial services | 2026 |
| Wilby House Ltd | Households | 2021 |
| Wildfire Construction Ltd | Construction | 2021 |
| Wildpouch Ltd | Wholesale & retail | 2024 |
| Wilkins and Reed Holdings Limited | Financial services | 2021 |
| Wilkinson Medical Supplies Limited | Wholesale & retail | 2022 |
| Willard Enterprises Limited | Professional & scientific | 2013 |
| Willian Court Management Company Limited | Real estate | 1985 |
| Willow & Blush Limited | Other services | 2016 |
| Willowmead Residential Home Ltd. | Health & social care | 2004 |
| Wills and Estate Practitioners Limited | Professional & scientific | 2012 |
| Wilson Foster Properties (London) Ltd | Real estate | 2022 |
| Winchfield Classic Trucks Limited | Wholesale & retail | 2020 |
| Windmill Hill Developments Ltd | Construction | 2021 |
| Windscreen Wipers Direct Limited | Wholesale & retail | 2014 |
| Winetroubleshooter Limited | Professional & scientific | 2012 |
| Wing (Wellcare) Limited | Wholesale & retail | 2023 |
| Wing Station Express Limited | Hospitality | 2025 |
| Wing Station UK Ltd | Hospitality | 2021 |
| Wings Global Enterprises Limited | Wholesale & retail | 2024 |
| Winn Trading Limited | Real estate | 2015 |
| Wintech IT (S) Limited | Information & communication | 2011 |
| Wise Dynamics Consulting Ltd | Information & communication | 2015 |
| Wiseendo Limited | Health & social care | 2019 |
| Wisteria Audit Ltd | Professional & scientific | 2019 |
| Wisteria Limited | Professional & scientific | 2002 |
| Wisteria Registrars Limited | Extraterritorial | 2006 |
| Withies Boutique Rooms Ltd | Hospitality | 2026 |
| Withies Restaurant Ltd | Hospitality | 2026 |
| WIZ Technologes Ltd | Information & communication | 2021 |
| Wolmer and Partners LLP | | 2012 |
| Wolsey Estates Limited | Real estate | 2016 |
| WON-180.CO.UK Limited | Administrative & support | 2013 |
| Wonder Properties Ltd | Real estate | 2023 |
| Wonderpost Flat Management Company Limited | Households | 1990 |
| Woodford Lane Ltd | Extraterritorial | 2019 |
| Woodford Projects Limited | Construction | 2016 |
| Woodland Realty Limited | Construction | 2023 |
| Woodman & Blount Limited | Construction | 1978 |
| Woodsomemachoward Ltd | Professional & scientific | 2024 |
| Woolton Grange Limited | Health & social care | 2011 |
| Workgluu Limited | Information & communication | 2022 |
| World Governance Centre Ltd | Information & communication | 2023 |
| World of Flowers Ltd | Wholesale & retail | 2016 |
| World Pro Solutions Limited | Information & communication | 2012 |
| Worldace Limited | Other services | 1984 |
| Worldwide Property Holdings (IT) Ltd | Real estate | 2024 |
| Worldwide Property Holdings Ltd | Real estate | 2020 |
| Worldwide Travel Network Ltd | Administrative & support | 2024 |
| Wraith Freehold Limited | Financial services | 2017 |
| Wraith Leasehold Limited | Financial services | 2017 |
| Wraith Trading Limited | Hospitality | 2005 |
| Wraplane Limited | Real estate | 1985 |