| Williams Studios Limited | Information & communication | 2025 |
| Williamson Developments Limited | Real estate | 2006 |
| Willingale Limited | Real estate | 1967 |
| Willmott Vision Services Limited | Professional & scientific | 2000 |
| Willott Holdings Ltd | Real estate | 2024 |
| Willoughby Green Limited | Professional & scientific | 2021 |
| Willow Asset Management Ltd | Other services | 2014 |
| Willow Path Supported Living Ltd | Health & social care | 2025 |
| Willow Sports Consulting Limited | Other services | 2016 |
| Willowbrook (Bramford) Management Company Limited | Households | 2018 |
| Willowdale Liverpool RTM Company Ltd | Households | 2022 |
| Willowdale Road Ltd | Wholesale & retail | 2019 |
| Willowqs Limited | Professional & scientific | 2025 |
| Willows Car Body Repairs Limited | Wholesale & retail | 2014 |
| Willowtree Homes & Developments Limited | Construction | 2022 |
| Willowtree Property Holdings Ltd. | Real estate | 2024 |
| Willsafe Document Protection Ltd | Professional & scientific | 1996 |
| Willy Transport Ltd | Transport & logistics | 2023 |
| Wilms (UK) Limited | Wholesale & retail | 1999 |
| Wilms Property Ltd | Financial services | 2020 |
| Wilson Financial Planning Limited | Financial services | 2023 |
| Wilstar Marketing Limited | Other services | 1965 |
| Wiltsher Traffic Ltd | Construction | 2022 |
| Wiluro Logistics Ltd | Transport & logistics | 2026 |
| Wily Limited | Transport & logistics | 2024 |
| Wincer Kievenaar Architects Limited | Professional & scientific | 2015 |
| Wind Hospitality Limited | Hospitality | 2025 |
| Wind Technik Nord UK Ltd | Energy | 2013 |
| WIND17 Ltd | Hospitality | 2019 |
| Windiman Ltd | Construction | 2006 |
| Windmill Tours Limited | Administrative & support | 2022 |
| Window Cleaning Elite Ltd | Administrative & support | 2026 |
| Window Film Centre Ltd | Administrative & support | 2005 |
| Window Junction Limited | Manufacturing | 2018 |
| Windsong Boats Ltd | Manufacturing | 2020 |
| Windsor & Patania Limited | Professional & scientific | 2017 |
| Windsor Property Group Limited | Real estate | 2016 |
| Windy-Mere Limited | Real estate | 2020 |
| Wing Golf Ltd | Wholesale & retail | 2021 |
| Wingate Security Limited | Administrative & support | 2025 |
| Winleigh Construction Ltd | Construction | 2024 |
| Winmil Limited | Health & social care | 2015 |
| Winners Vision Ltd | Arts & recreation | 2025 |
| Winshell Limited | Construction | 2007 |
| Winsme Consulting Limited | Professional & scientific | 2024 |
| Winsme Holdco Ltd | Financial services | 2024 |
| Winston House Properties Limited | Construction | 1979 |
| Winter Logistics Ltd | Transport & logistics | 2024 |
| Wireless Thinking Ltd | Information & communication | 2009 |
| Wiremek Holdings Limited | Financial services | 2016 |
| Wiremek Limited | Manufacturing | 1993 |
| Wiremek Power Limited | Manufacturing | 2020 |
| Wiretec Electrical Ltd | Manufacturing | 2016 |
| Wirewise Ltd | Construction | 2023 |
| Wisdom Tooth Holdings Limited | Real estate | 2025 |
| Wise Smart Building Contractors Essex Limited | Construction | 2025 |
| Wise Smart Developments Limited | Construction | 2023 |
| Wise Smart Group Limited | Construction | 2025 |
| Wise Smart Interiors Limited | Construction | 2023 |
| Wise Smart Maintenance Limited | Construction | 2023 |
| Wise Wolf Limited | Information & communication | 2016 |
| Wiseclothinguk Ltd | Wholesale & retail | 2023 |
| Wisemonk Consulting Limited | Professional & scientific | 2016 |
| Wishango Limited | Wholesale & retail | 2010 |
| Wishcart Limited | Wholesale & retail | 2023 |
| Wishes and Brooms Limited | Administrative & support | 2025 |
| Witek Spirits Ltd | Wholesale & retail | 2018 |
| Withersdale Property Limited | Real estate | 1998 |
| Witnesham (Suffolk) Limited | Other services | 2018 |
| Witnesham Ventures Limited | Real estate | 1990 |
| Witpold Limited | Extraterritorial | 2003 |
| Wits Consultancy Ltd | Public administration | 2015 |
| Witten’S Meadow (Witnesham) Management Company Limited | Households | 2024 |
| Witteveen Commerce LLP | | 2023 |
| Wizard Media Services Limited | Professional & scientific | 2016 |
| WK Lumsden and Daughter Limited | Hospitality | 2017 |
| WK Projects Ltd | Manufacturing | 2026 |
| Wkdr Limited | Manufacturing | 2014 |
| Wmld Limited | Real estate | 2021 |
| WN Aligned Ltd | Construction | 2025 |
| WN Estates 2024 Limited | Real estate | 2022 |
| WO & PO Jolly (Ipswich) Limited | Real estate | 1994 |
| Woden and Wyld Ltd | Wholesale & retail | 2024 |
| Woffee Limited | Hospitality | 2018 |
| Wokay Media Ltd | Real estate | 2022 |
| Woledge Properties Limited | Real estate | 2021 |
| Wolf Haulage Limited | Transport & logistics | 2025 |
| Wolf Trade Group Ltd | Wholesale & retail | 2025 |
| Wolsey 550 CIC | Arts & recreation | 2022 |
| Wolsey Cleaning Ltd | Administrative & support | 2017 |
| Wolsey Mortgage Company Limited | Financial services | 2017 |
| Womblers CIC | Water & waste | 2024 |
| Women in Construction Anglia BTG CIC | Education | 2026 |
| Women in Construction Anglia Limited | Public administration | 2024 |
| Wonderfall Estates Limited | Real estate | 2004 |
| Wonderfully Motivated and Dedicated to Excellence Limited | Education | 2014 |
| Wongs Chinese Ltd | Hospitality | 2023 |
| Wongs IP6 Ltd | Hospitality | 2026 |
| Woo-Than CAN Technical Limited | Professional & scientific | 2018 |
| Wood Brothers Builders Ltd | Construction | 2012 |