| WJM Project Solutions Ltd | Professional & scientific | 2019 |
| WJP Investments Limited | Professional & scientific | 2016 |
| WLP Lighting Ltd | Information & communication | 2013 |
| WMD Studios Ltd | Information & communication | 2013 |
| Wmec Limited | Manufacturing | 1994 |
| WML Brokers Ltd | Financial services | 2010 |
| Woburn Court Tenants Association Limited | Households | 2005 |
| Wolf Marine Security Ltd | Administrative & support | 2026 |
| Wollah Wollah Limited | Hospitality | 2016 |
| Wonder Properties West Ltd | Real estate | 2017 |
| Wonderland Park Limited Liability Partnership | | 2004 |
| Woodberry Investments LLP | | 2014 |
| Woodberry Technology Limited | Manufacturing | 2021 |
| Wooddale Limited | Real estate | 2023 |
| Wooden Floors UK Limited | Wholesale & retail | 2018 |
| Woodend Management Company Limited | Households | 1987 |
| Woodenfloorsuk.Com Ltd | Extraterritorial | 2019 |
| Woodfield Agency Ltd | Administrative & support | 2019 |
| Woodfield Close Management Limited | Households | 2020 |
| Woodhorn Farm Ltd | Agriculture & fishing | 2025 |
| Woodlands Premium Foods Limited | Wholesale & retail | 2025 |
| Woodside Investment Group Limited | Financial services | 2026 |
| Woodside Nursery Ltd | Education | 2011 |
| Woodson Timetable and Curriculum Consultancy Ltd | Professional & scientific | 2023 |
| Woof Works Productions Ltd | Information & communication | 2025 |
| Woolshed Designs Limited | Manufacturing | 2008 |
| Woolspinners Close Management Company Limited | Households | 2023 |
| Wootton Consulting for Millennial Review Ltd | Professional & scientific | 2019 |
| Words OUT Loud Publishing Ltd | Information & communication | 2025 |
| Workdonkey Limited | Wholesale & retail | 2016 |
| Working Health Solutions Ltd | Health & social care | 2006 |
| Working Health UK Limited | Health & social care | 2005 |
| Workspace Accounting Limited | Professional & scientific | 2012 |
| Workspace SJH Limited | Real estate | 2018 |
| Workwear Mega Store Ltd | Manufacturing | 2021 |
| World Horse Racing Limited | Arts & recreation | 2021 |
| World of Solar Maintenance Ltd | Other services | 2022 |
| World Phone Accessories Ltd | Other services | 2019 |
| World Pride Property Ltd | Real estate | 2018 |
| Worldwide Concerts & Management Limited | Arts & recreation | 2005 |
| Worldwide Telemedia Limited | Professional & scientific | 1998 |
| Wotter Group Limited | Information & communication | 2018 |
| WPC 5 Limited | Financial services | 2017 |
| WPC Hotels Limited | Financial services | 2021 |
| WPC Management Services Limited | Financial services | 2021 |
| WPC17 Limited | Financial services | 2021 |
| WPC21 Limited | Financial services | 2022 |
| WPC23 Limited | Financial services | 2023 |
| WPC24 Limited | Financial services | 2023 |
| WPC25 Limited | Financial services | 2023 |
| WPC26 Limited | Financial services | 2023 |
| WPC27 Limited | Financial services | 2023 |
| WPE Holdings Limited | Financial services | 2014 |
| Wpeha Limited | Financial services | 2024 |
| Wraptech Ltd | Wholesale & retail | 2020 |
| WS Damp Control Limited | Manufacturing | 2023 |
| WSG Consulting Global Ltd | Information & communication | 2021 |
| WSO2 (UK) Limited | Information & communication | 2005 |
| WTC Group Ltd | Water & waste | 2025 |
| WUG 1 Limited | Professional & scientific | 2023 |
| Www.Opennshut.Co.Uk Limited | Wholesale & retail | 2005 |
| Wyck Hill Hotel Limited | Financial services | 2021 |
| Wyvern Centre Estates Limited | Real estate | 2024 |
| Wyvern Court Limited | Households | 1987 |
| X Gym Chichester Ltd | Arts & recreation | 2024 |
| Xalon Investments Ltd | Financial services | 2014 |
| Xeuphoria Ltd | Wholesale & retail | 2020 |
| Xintu Ltd | Wholesale & retail | 2019 |
| XL Graphics Limited | Manufacturing | 2006 |
| XSG Limited | Professional & scientific | 2008 |
| XSG Rail Limited | Professional & scientific | 2022 |
| Y & Y Property Holding Ltd | Real estate | 2024 |
| Yacht Support Solutions Ltd | Extraterritorial | 2024 |
| Yard 44 Management Limited | Households | 2014 |
| Yasumed Ltd | Health & social care | 2023 |
| Yates Company Holdings Ltd | Financial services | 2026 |
| Yedu Care Limited | Health & social care | 2024 |
| Yellow Balloon Films Limited | Information & communication | 2015 |
| Yellow Brick Services Ltd | Professional & scientific | 2024 |
| Yellow Dog Developments Limited | Extraterritorial | 2015 |
| Yellow Holdings Ltd | Wholesale & retail | 2019 |
| Yellowman Limited | Information & communication | 1997 |
| Yevnig Limited | Manufacturing | 2018 |
| Yippy AI Limited | Extraterritorial | 2025 |
| Yogi Eyecare Ltd | Administrative & support | 2010 |
| Yothop Ltd | Administrative & support | 2014 |
| Young People's Shop Ltd | Health & social care | 2012 |
| Young Plants Limited | Wholesale & retail | 1941 |
| Your Future Energy Ltd | Professional & scientific | 2016 |
| Your Garden Design Ltd | Administrative & support | 2021 |
| Your Local Advisor Limited | Information & communication | 2021 |
| Yourfruit Ltd | Agriculture & fishing | 2018 |
| Yourstaff Recruitment Limited | Administrative & support | 2016 |
| Youth Dream (Selsey) Limited | Administrative & support | 2013 |
| YR Acorn UK Ltd | Extraterritorial | 2024 |
| YU Kitchen Ltd | Hospitality | 2023 |
| Z & S (Basket) Ltd | Hospitality | 2020 |
| Z & S (Brighton) Ltd | Hospitality | 2019 |
| Z & S (Broadwater) Ltd | Hospitality | 2022 |
| Z & S (Constant) Ltd | Hospitality | 2022 |