| William the Concreter Limited | Manufacturing | 2004 |
| Williams Live Ltd | Information & communication | 2024 |
| Willingdon Court (Management) Limited | Households | 1960 |
| Willingdon Enterprises Ltd | Wholesale & retail | 2018 |
| Willingdon Golf Club Limited | Arts & recreation | 1984 |
| Willingdon Medical Services Limited | Health & social care | 2015 |
| Willis OH Ltd | Health & social care | 2025 |
| Willow Court (Polegate) RTM Company Limited | Households | 2023 |
| Willowfield Property Holdings Ltd | Real estate | 2018 |
| Willows (Seaford) Management Company Limited(The) | Households | 1982 |
| Willowtree Media Limited | Information & communication | 2018 |
| Wills & Probate Solutions Ltd | Professional & scientific | 2023 |
| Wills & Trew Interiors Limited | Other services | 2006 |
| Willytodd Leisure Limited | Hospitality | 2002 |
| Wilmoths Holdings Limited | Wholesale & retail | 2002 |
| Wilson Heath Limited | Manufacturing | 2023 |
| Wilson House Dental Limited | Health & social care | 2017 |
| Wilson’S Recycling Ltd | Transport & logistics | 2024 |
| Wimbledon Medical Specialists Ltd | Health & social care | 2019 |
| Wincanton Property Investments Ltd | Real estate | 2016 |
| Winchmore Technology Ltd | Information & communication | 2012 |
| Windmill Feeds & Saddlery Limited | Wholesale & retail | 2010 |
| Windover Holdings Ltd | Financial services | 2018 |
| Window Surgeon (Southern) Ltd | Construction | 2007 |
| Windowman Somerset Ltd | Construction | 2019 |
| Windowman Weymouth Ltd | Construction | 2020 |
| Windward Quay Ltd | Real estate | 2011 |
| Wine Obsessed Ltd | Wholesale & retail | 2025 |
| Wingrove Estates Ltd | Real estate | 2022 |
| Winny Trading Co. Limited | Extraterritorial | 2003 |
| Winston (Hailsham) Management Limited | Households | 1982 |
| Wired Creative Limited | Professional & scientific | 2018 |
| Wish Hill Estates Ltd | Real estate | 2026 |
| Wish Hill Limited | Real estate | 2017 |
| Wish Road Investments Limited | Professional & scientific | 2019 |
| Wish Road Management Company Limited | Extraterritorial | 2011 |
| Wishes Made Easy Ltd | Wholesale & retail | 2026 |
| Wishtower Ltd | Real estate | 2009 |
| Wishtower PM Limited | Real estate | 2022 |
| With YOU in Mind Limited | Health & social care | 2014 |
| Wlbc Cornerstone Limited | Wholesale & retail | 2022 |
| Wlnd Limited | Health & social care | 2015 |
| WM Building Storge Ltd | Wholesale & retail | 2025 |
| Woburn Sands Dental Limited | Health & social care | 2021 |
| Woking House Limited | Real estate | 2016 |
| Wolf Designz Ltd | Professional & scientific | 2020 |
| Wolf Rentals Ltd | Real estate | 2020 |
| Women in the Fire Service UK Ltd | Public administration | 2008 |
| Wonderfully Whimsical Ltd | Wholesale & retail | 2023 |
| Wonderland House Ltd | Hospitality | 2024 |
| Wonki Ware Limited | Wholesale & retail | 2016 |
| Wood and Associates Dental Care Limited | Health & social care | 2007 |
| Wood Sage Prints Ltd | Wholesale & retail | 2022 |
| Woodcroft Dental Practice Limited | Health & social care | 2009 |
| Woodfellas Ltd | Manufacturing | 2018 |
| Woodside Realty Limited | Real estate | 2000 |
| Woodward Electrical & Security Limited | Real estate | 2002 |
| Woodward M&E Ltd | Construction | 2026 |
| Woollard (Earthmoving) Limited | Construction | 1998 |
| Woollard Agricultural Services T/As WAS Ltd | Agriculture & fishing | 2012 |
| Wordstream Digital Ltd | Information & communication | 2021 |
| Working Solutions Recruitment Services Limited | Administrative & support | 2001 |
| Workplace Wellness Solutions Limited | Extraterritorial | 2024 |
| Worktom Ltd | Construction | 2018 |
| Workzone Exhibitions Ltd. | Administrative & support | 1999 |
| World of Phones Limited | Wholesale & retail | 2019 |
| Worldadvance Limited | Hospitality | 2006 |
| Worldbridge Holdings Limited | Real estate | 2025 |
| Worldwide Football Shirts Limited | Wholesale & retail | 2023 |
| Worldwide Webdesign Limited | Information & communication | 2006 |
| Worthwhile Ideas Limited | Construction | 2012 |
| Wound Healing Centres UK Limited | Health & social care | 1999 |
| WOW PR Limited | Administrative & support | 2016 |
| Wright Feet Podiatry Ltd | Health & social care | 2025 |
| Writeaway Lanyards Limited | Administrative & support | 2011 |
| Writeaway Promotional Products Limited | Administrative & support | 2006 |
| Writeread Ltd | Education | 2019 |
| Wrlo Accountants Ltd | Professional & scientific | 2014 |
| WS Finance Limited | Financial services | 2024 |
| Wso’S Ltd | Health & social care | 2019 |
| WTS Electrical Ltd | Construction | 2014 |
| WTS Property Solutions Ltd | Real estate | 2020 |
| WW Eastbourne Ltd | Arts & recreation | 2026 |
| WWW Diamond Forecasts Limited | Professional & scientific | 2002 |
| WYE Newsagency Ltd | Wholesale & retail | 2011 |
| Wykeham House Residents Limited | Households | 1995 |
| Wynnes Partnership LLP | | 2011 |
| Wyvern Medical Limited | Health & social care | 1989 |
| X-Build Events Ltd | Construction | 2018 |
| X-X.Net Ltd. | Information & communication | 2000 |
| Xcel Care Homes Ltd | Health & social care | 2007 |
| Xclusiv Jewellery Designs Limited | Wholesale & retail | 2026 |
| Xenia Property Ltd | Hospitality | 2025 |
| Xhessi Ltd | Real estate | 2018 |
| XMR Investments Limited | Real estate | 2024 |
| Xpress Investments Limited | Information & communication | 2025 |
| Xpress Maintenance & Locks Ltd | Construction | 2024 |
| Xygzag Ltd | Professional & scientific | 2021 |
| Xygzag Property Group Limited | Real estate | 2023 |
| Xygzag Ventures Limited | Financial services | 2023 |