| Watch Shorts Ltd | Information & communication | 2024 |
| Watchett Works Limited | Real estate | 2012 |
| Water Lane Lounge Limited | Hospitality | 2022 |
| Waterfield Developments Blackburn Ltd. | Construction | 2015 |
| Waterloo Cafe & Catering Ltd | Hospitality | 2017 |
| Waterloo Catering (Ireland) Ltd | Hospitality | 2016 |
| Waterloo Property Services Limited | Construction | 2019 |
| Waterpark Road Company Limited | Extraterritorial | 2012 |
| Watershed Home Ltd | Health & social care | 2024 |
| Waterside Close Management Company Limited | Households | 2026 |
| Watertec Solutions Limited | Water & waste | 2016 |
| Waterways CMS Limited | Construction | 2013 |
| Watford PC Repair Services Ltd | Manufacturing | 2020 |
| Wave Autohaus Ltd | Wholesale & retail | 2025 |
| Wavehill IT Solutions Limited | Information & communication | 2001 |
| Wavess Wellness Ltd | Manufacturing | 2023 |
| Way Down Home Ltd | Wholesale & retail | 2017 |
| Waywood Limited | Real estate | 1984 |
| WBG Group Corporation Limited | Wholesale & retail | 2020 |
| WCS Education Ltd | Education | 2019 |
| WDF Promotions Limited | Arts & recreation | 2020 |
| WE ARE Cognita Ltd | Information & communication | 2023 |
| WE ARE Yona Ltd | Information & communication | 2023 |
| WE Buy Sell Cars Limited | Wholesale & retail | 2025 |
| WE Clean ALL Limited | Administrative & support | 2025 |
| WE Hold the Keys Limited | Health & social care | 2022 |
| WE Know Floors Ltd | Construction | 2021 |
| WE Love Cushions (Retail) Limited | Wholesale & retail | 2012 |
| WE Love Cushions (Trade) Limited | Wholesale & retail | 2012 |
| WE Supply ANY Trade Limited | Administrative & support | 2025 |
| Wear ALL Limited | Manufacturing | 2014 |
| Web & Admin Limited | Administrative & support | 2021 |
| Webb Technology Limited | Arts & recreation | 2018 |
| Webgame Limited | Real estate | 2000 |
| Webquotient Ltd | Wholesale & retail | 2016 |
| Webuyanydeck LDN Limited | Wholesale & retail | 2022 |
| Wednesfield Nails Limited | Other services | 2021 |
| Welaway Systems Ltd | Construction | 2024 |
| Well-Led Physiotherapy Ltd | Health & social care | 2014 |
| Wellbeing and Balance Limited | Manufacturing | 2018 |
| Wellbeone Healthcare Limited | Health & social care | 2024 |
| Wellington Star Ltd | Real estate | 2017 |
| Wellington Tree Garden Conservation Ltd | Extraterritorial | 2014 |
| Wellmet Ltd | Hospitality | 2009 |
| Wellness Professionals at Work Ltd | Education | 2023 |
| Welovekids Limited | Education | 2023 |
| Wembley Nails Limited | Other services | 2022 |
| Weme Services Ltd | Professional & scientific | 2010 |
| Wendyshalom Limited | Other services | 2020 |
| Wentworth House Management Limited | Real estate | 1980 |
| Wesellanydeck Ltd | Wholesale & retail | 2018 |
| Wesley Facilities Limited | Real estate | 2021 |
| Wesley Pemberton LLP | | 2008 |
| West Cottage Group Ltd | Financial services | 2020 |
| West Country Tree Farm Ltd | Agriculture & fishing | 2020 |
| West Country Trees Farm Ltd. | Agriculture & fishing | 2016 |
| West Country Trees Ltd. | Agriculture & fishing | 2016 |
| West Country Trees Swordale Limited | Agriculture & fishing | 2021 |
| West Heritage UK Ltd | Wholesale & retail | 2019 |
| Westec Property Limited | Construction | 2010 |
| Western Avenue Properties Limited | Wholesale & retail | 2016 |
| Western Duties Limited | Other services | 2026 |
| Western Flowers Ltd | Wholesale & retail | 2016 |
| Westmore Fine Foods Ltd | Wholesale & retail | 2026 |
| Westprize Limited | Construction | 2004 |
| Westward Flats Management Company Limited | Hospitality | 1989 |
| Wexford Taverns Limited | Hospitality | 2003 |
| Wexmere Mercantile Ltd | Wholesale & retail | 2025 |
| Weylin Ltd | Other services | 2026 |
| Whalley Estates Ltd | Real estate | 2024 |
| Wharfside Management Limited | Real estate | 1988 |
| Whatsyourcosy Limited | Professional & scientific | 2015 |
| Wheatland Cheese Co Limited | Wholesale & retail | 2023 |
| Wheatland Cheese UK Limited | Wholesale & retail | 2022 |
| Wheatleyus Ltd | Professional & scientific | 2023 |
| Wheel Angels Limited | Wholesale & retail | 2017 |
| Whetstone Property Maintenance Limited | Real estate | 2020 |
| Whispering Willow Investments Ltd | Real estate | 2025 |
| Whitakers Bathrooms and Building Ltd | Construction | 2011 |
| White Dog Consulting Limited | Professional & scientific | 2010 |
| White Glove Cleaning Services Ltd | Households | 2023 |
| White Hart Lane Jerk Centre Ltd | Hospitality | 2020 |
| White Photographic Limited | Arts & recreation | 2011 |
| White Rose Child Care Limited | Health & social care | 2021 |
| Whitehall RD Limited | Real estate | 2021 |
| Whitehall RD Management Limited | Real estate | 2021 |
| Whitethorn Services Limited | Professional & scientific | 2021 |
| Whitworth Crescent RTM Company Limited | Households | 2003 |
| Wholesale Nation Ltd | Wholesale & retail | 2025 |
| Whoops Wheel FIX IT Limited | Wholesale & retail | 2014 |
| WHY MEE? Limited | Hospitality | 2023 |
| Whyte Technologies Ltd | Professional & scientific | 2021 |
| Wick Investments and Developments Limited | Real estate | 2017 |
| Wickfield Holdings Limited | Real estate | 2020 |
| Wilcliffe Limited | Financial services | 2017 |
| Wild Mane Travel Limited | Administrative & support | 2025 |
| Wildin Limited | Information & communication | 2017 |
| Willbridge Limited | Professional & scientific | 2025 |
| Willen Biogas Ltd | Energy | 2012 |
| Willen Group Ltd | Energy | 2022 |