| Wellington Place Residents Company Limited | Households | 1995 |
| Wellreach Limited | Administrative & support | 1993 |
| Wellwin Ltd | Professional & scientific | 2013 |
| Welsford Power Services Ltd | Construction | 2014 |
| Wesley's Care Limited | Health & social care | 2015 |
| Wessex Vision Ltd | Health & social care | 2023 |
| West END Quarter (Folkestone) Management Company Limited | Households | 2016 |
| West R&R Limited | Real estate | 2015 |
| West Renovate Building Services Limited | Construction | 2020 |
| West Road Fish Bar Limited | Hospitality | 2022 |
| West Two Dairies Limited | Wholesale & retail | 2003 |
| Westborough (Essex) Limited | Real estate | 2020 |
| Westbrook Moorings Management Company Limited | Households | 2021 |
| Westleigh Court Company Limited | Real estate | 2013 |
| Westminster Mansions RTM Company Limited | Households | 2006 |
| Westminster Securities & Trusts Ltd | Financial services | 2013 |
| Westroots Management Limited | Households | 2010 |
| Westway Group Ltd | Water & waste | 2018 |
| Westwood Park (Churwell) Management Company Limited | Households | 2018 |
| Westwood Point (Thanet) Management Company Limited | Households | 2019 |
| WET Weather Ltd | Wholesale & retail | 2021 |
| WGS & Property Management Ltd | Real estate | 2021 |
| Wharf Pool Fishery Ltd | Agriculture & fishing | 2022 |
| Whinnie and the Whimsicals Ltd | Wholesale & retail | 2025 |
| White & Co Solicitors Limited | Professional & scientific | 2018 |
| White Calm Wellbeing Limited | Administrative & support | 2018 |
| White Label Cleaning Ltd | Administrative & support | 2026 |
| White Pine Elite Cleaning Limited | Administrative & support | 2025 |
| White Rose Event Hire Limited | Administrative & support | 2026 |
| Whitehall Business Consultancy Ltd | Professional & scientific | 2020 |
| Whitehall Home Retail Ltd | Extraterritorial | 2024 |
| Whitehouse Plumbing and Heating Ltd | Construction | 2016 |
| Whitehouse Village Residents Association Limited | Households | 2006 |
| Whitesands Limited | Real estate | 1991 |
| Who's Next Barbers Limited | Other services | 2015 |
| Wickford Heatline Limited | Other services | 2002 |
| Wide Mouth Frog Ltd | Hospitality | 2024 |
| Wigen Coffee Ltd | Hospitality | 2015 |
| Wilce Media Group Limited | Financial services | 2014 |
| Wildish Asset Finance Limited | Real estate | 2021 |
| Wilkin Court Freeholders Limited | Households | 2006 |
| Williamson Independent Advisory Limited | Administrative & support | 2026 |
| Willow Court (Shoebury) Management Ltd | Households | 2022 |
| Willow Financial Planning Limited | Financial services | 2012 |
| Willow FP (UK) Limited | Financial services | 2018 |
| Willowdene (Filton) Management Company Limited | Households | 2018 |
| Wilma Property Limited | Real estate | 2025 |
| Wilma's Bakery Ltd | Hospitality | 2019 |
| Wilma's Holdings Limited | Administrative & support | 2026 |
| Wilma's Retail Ltd | Hospitality | 2021 |
| Wilma's Retail Rayleigh Limited | Hospitality | 2022 |
| Wilson Ventures Limited | Professional & scientific | 2014 |
| Wimsey Management Company Limited | Real estate | 1981 |
| Win.Ex Ltd | Construction | 2025 |
| Winchester Car & Van Sales Ltd | Wholesale & retail | 2021 |
| Wind Breakers Limited | Real estate | 2019 |
| Windermere Props Limited | Administrative & support | 2017 |
| Windhover Wine Company Limited | Manufacturing | 2022 |
| Windrush Place Local Centre Management Company Limited | Households | 2024 |
| Wine Meats Cheese Ltd | Wholesale & retail | 2020 |
| Winstanley Associates Limited | Administrative & support | 2025 |
| Winstanley Associates Recruitment Limited | Information & communication | 2019 |
| Winsure Limited | Construction | 2022 |
| Wintech Products Co Ltd | Wholesale & retail | 2025 |
| Winterfields Group Ltd | Mining & quarrying | 2018 |
| Winx Living Limited | Hospitality | 2015 |
| Wired & Inspired Limited | Professional & scientific | 2010 |
| Wirex Solutions Ltd | Information & communication | 2025 |
| Wisdom Dental Limited | Health & social care | 2022 |
| Wise OWL Dental Ltd | Health & social care | 2023 |
| Wise Price Ltd | Wholesale & retail | 2021 |
| Wise-Esm Ltd | Information & communication | 2021 |
| Wiseman Financial Solutions Limited | Financial services | 2026 |
| Wish Meadow Limited | Administrative & support | 2009 |
| Wittstone Limited | Financial services | 2025 |
| Wmillington Ltd | Construction | 2019 |
| Wombwell (Barnsley) Management Company Limited | Households | 2015 |
| Women in Protection Network | Other services | 2024 |
| Women in Revenues and Enforcement Limited | Education | 2024 |
| Women Together Limited | Professional & scientific | 2022 |
| Wonderlost Ltd | Hospitality | 2024 |
| Wondres Limited | Health & social care | 2016 |
| Wondrous Works Ltd | Extraterritorial | 2014 |
| Wood Green Management Limited | Households | 1988 |
| Wooden Fish Media Ltd | Other services | 2023 |
| Woodfine Properties Ltd | Real estate | 2018 |
| Woodlogic Limited | Transport & logistics | 2011 |
| Woodlords Ltd | Manufacturing | 2024 |
| Woodshavings Direct Limited | Manufacturing | 2002 |
| Woodside's Little ME Pre-School Ltd | Health & social care | 2019 |
| Woodstock Investments Limited | Real estate | 2000 |
| Woodtec Interiors Limited | Manufacturing | 2002 |
| Woolf GAS and Heating Services Limited | Construction | 2014 |
| Wootons Inn Ltd | Hospitality | 2017 |
| Work Place Media Limited | Professional & scientific | 2014 |
| World Climate Ltd | Administrative & support | 2010 |
| Worldwide Vets Limited | Professional & scientific | 2023 |
| Worldwide Volunteers Ltd | Administrative & support | 2010 |
| Worth & Co Blinds Limited | Manufacturing | 2007 |
| WOW House Services Ltd | Households | 2017 |