| Westfield Hostel Limited | Hospitality | 2008 |
| Westlondonscooterentals Ltd | Administrative & support | 2025 |
| Westonholm Limited | Financial services | 2020 |
| Westro Financial Limited | Financial services | 2018 |
| Westview Housing Limited | Real estate | 2006 |
| Westwide Ltd | Wholesale & retail | 2021 |
| WFC Chauffeurs Ltd | Transport & logistics | 2019 |
| What a Brand Limited | Hospitality | 2020 |
| Whateverit.Com Ltd | Information & communication | 2017 |
| Wheelchair Lift Wizards Ltd | Transport & logistics | 2025 |
| Wheeliebin Valet Limited | Administrative & support | 2023 |
| Wheelium Ltd | Wholesale & retail | 2025 |
| While Rising Limited | Information & communication | 2016 |
| Whippendell News Agents Ltd | Wholesale & retail | 2023 |
| White Bear Gaming Limited | Extraterritorial | 2015 |
| White Brix Limited | Construction | 2025 |
| White City Theatre Limited | Arts & recreation | 2018 |
| White Curl Linen Ltd | Wholesale & retail | 2026 |
| White Hawk Convenience Ltd | Wholesale & retail | 2023 |
| White Leaf Limited | Wholesale & retail | 2021 |
| White Real Solutions Limited | Construction | 2019 |
| White Rock Consultants Ltd | Professional & scientific | 2026 |
| White Swan Garage Limited | Wholesale & retail | 2006 |
| White Tiger Holidays Limited | Administrative & support | 2026 |
| Whitepeckers Limited | Professional & scientific | 2024 |
| Whizzdom Ltd | Education | 2022 |
| Whole Life Supplies Limited | Extraterritorial | 2020 |
| Wholesale Culinary Hub Ltd | Wholesale & retail | 2025 |
| Wholesale Machinery Limited | Wholesale & retail | 2025 |
| WHS Dental Practice Limited | Health & social care | 2022 |
| Widad Hospitality Solutions Ltd | Wholesale & retail | 2025 |
| Widad International Ltd | Construction | 2024 |
| Wider Smiles Ltd | Health & social care | 2023 |
| Wiggy Brother Properties Ltd | Real estate | 2017 |
| Wight Corporation Limited | Professional & scientific | 2012 |
| Wild Construction Services Ltd | Construction | 2024 |
| Wild Herz Ltd | Administrative & support | 2018 |
| Wild Life Aromatics Ltd | Wholesale & retail | 2026 |
| Will Archive Limited | Wholesale & retail | 2024 |
| Will Promotional Products Ltd | Wholesale & retail | 2014 |
| Will Trade (UK) Ltd | Wholesale & retail | 2025 |
| Willdev Ltd | Real estate | 2019 |
| Willesden Holdings Limited | Financial services | 2018 |
| Willow Farm Food & Wine Ltd | Wholesale & retail | 2020 |
| Willow Mechanical Ltd | Construction | 2026 |
| Willow Tree Music Ltd | Information & communication | 2017 |
| Wimpole Digital Limited | Information & communication | 2016 |
| Win-Win Economy Limited | Extraterritorial | 2023 |
| Windcrest (Belmont) Ltd | Construction | 2021 |
| Windcrest (U.K.) Limited | Manufacturing | 1995 |
| Windcrest Liftbits Limited | Manufacturing | 2002 |
| Windcrest Packham Ltd | Households | 2021 |
| Windcrest Studio 40 Ltd | Households | 2021 |
| Windermere DRY Cleaners Limited | Wholesale & retail | 2012 |
| Windermere Food and Wine Limited | Wholesale & retail | 2023 |
| Window Engineer Ltd | Construction | 2025 |
| Wings for Wanderlust Limited | Administrative & support | 2025 |
| Wings Wagen Ltd | Hospitality | 2021 |
| Wino Yestate Ltd | Real estate | 2022 |
| Winstream Ltd | Professional & scientific | 2026 |
| Wipra Soft Ltd | Information & communication | 2025 |
| Wipro Soft (UK ) Limited | Information & communication | 2015 |
| Wisdom Arts Ltd | Arts & recreation | 2023 |
| Wisdom of Nature Ltd | Health & social care | 2022 |
| Wise Games Ltd | Information & communication | 2022 |
| Wise Guys Plumbing Ltd | Wholesale & retail | 2017 |
| Wise Projects Ltd | Construction | 2015 |
| Wise-Tax Consulting Ltd | Other services | 2019 |
| Wisepark Limited | Transport & logistics | 1982 |
| Wish Investments Ltd | Real estate | 2018 |
| Wishart Events and Business Solutions Ltd | Administrative & support | 2014 |
| Without Spot Limited | Administrative & support | 2021 |
| Witley Gold Limited | Health & social care | 2021 |
| Wizards of Web Ltd | Wholesale & retail | 2023 |
| Wizfinish Limited | Information & communication | 2023 |
| Wizlane Ltd | Information & communication | 2020 |
| Wizora Technologies Ltd | Information & communication | 2026 |
| WJE Construction Ltd | Construction | 2018 |
| WM Financial Consultancy Limited | Information & communication | 2015 |
| WML London Limited | Hospitality | 2024 |
| WO Star Foods Ltd | Hospitality | 2025 |
| Wobil Engineering Limited | Construction | 1997 |
| Wodu Squared Ltd | Information & communication | 2015 |
| Wolf Pro Ltd | Construction | 2026 |
| Wolfpack Inc Ltd | Professional & scientific | 2022 |
| Women for Rights (UK) Limited | Education | 2023 |
| Women of Power LDN Limited | Other services | 2023 |
| Wondaz I.T Solutions Ltd | Information & communication | 2019 |
| Wood Mosaic Ltd | Wholesale & retail | 2017 |
| Woodbrick Ltd | Manufacturing | 2025 |
| Woodford (Cardiff) Limited | Hospitality | 1963 |
| Woosteruk Ltd | Construction | 2025 |
| Worksite Solutions Ltd | Construction | 2025 |
| World Accessories NET1 Limited | Wholesale & retail | 2016 |
| World Classical Music Ltd | Arts & recreation | 2022 |
| World Commercial Law Office Co., Ltd | Professional & scientific | 2023 |
| World Fashion Market Ltd | Extraterritorial | 2014 |
| World Nutrition Ltd | Wholesale & retail | 2018 |
| World Tamils Historical Society | Agriculture & fishing | 2015 |
| World Wide Waffles Limited | Hospitality | 2025 |