| W&S Electrical Contractors Ltd | Construction | 2020 |
| Wake-O Consulting Ltd | Professional & scientific | 2026 |
| Walker Monroe Limited | Professional & scientific | 2012 |
| Walter&Bee Ltd | Wholesale & retail | 2025 |
| Walters Asset Holdings Ltd | Real estate | 2015 |
| Walters Property Limited | Real estate | 2015 |
| Walton Street Designs Limited | Arts & recreation | 1985 |
| Warmcare Installations Ltd | Construction | 2021 |
| Watkins Commercial Limited | Administrative & support | 2004 |
| Watt-Vapes (2026) Limited | Wholesale & retail | 2026 |
| Watt-Vapes Ltd | Wholesale & retail | 2021 |
| Waylor Limited | Wholesale & retail | 2003 |
| WE Build Limited | Construction | 1999 |
| Weald Property Limited | Real estate | 2016 |
| Wearmaster Limited | Wholesale & retail | 2012 |
| Webb CAB Limited | Transport & logistics | 2018 |
| Wellesley House Freehold Ltd | Households | 2016 |
| West Furlong Court Management Company Limited | Real estate | 2016 |
| West One Trading Limited | Real estate | 1992 |
| Whitby Associates Limited | Information & communication | 2025 |
| White Horse Inn Hurstpierpoint Ltd | Hospitality | 2026 |
| White Oaks Sussex Limited | Hospitality | 2024 |
| White's Vehicle Services Ltd | Wholesale & retail | 2023 |
| Whittaker Rose Holdings Ltd | Financial services | 2025 |
| Wick Farm Holdings Limited | Construction | 2021 |
| Wickens Land Co Limited | Real estate | 2025 |
| Wide and Narrow (Smokehouse) Limited | Hospitality | 2020 |
| Wifi Stock (UK) Ltd | Wholesale & retail | 2009 |
| Wildcoast Consulting Ltd | Professional & scientific | 2014 |
| Wilkinson Landscapes (Sussex) Limited | Administrative & support | 2003 |
| Will Connect Ltd | Professional & scientific | 2025 |
| Will Hunt Racing Ltd | Arts & recreation | 2018 |
| William & James Properties Ltd | Real estate | 2017 |
| Willows (Hassocks) Limited(The) | Households | 1975 |
| Wilmington Close Residents Association Limited | Real estate | 1962 |
| Wilmington Developments Ltd | Construction | 2024 |
| Wind Prospect Bonds PLC | Financial services | 2011 |
| Wind Prospect Developments 2 Limited | Energy | 2009 |
| Wind Prospect Developments Limited | Professional & scientific | 2000 |
| Wind Prospect Enterprises Limited | Energy | 2004 |
| Wind Prospect Group Limited | Energy | 1996 |
| Wind Prospect Limited | Energy | 1995 |
| Wolf Music Recordings Limited | Information & communication | 2011 |
| Woollaston Property Developments Limited | Real estate | 2010 |
| Work 4 a Day Ltd | Households | 2022 |
| World Aero Inspection Technologies Ltd | Manufacturing | 2014 |
| Worldwide POS Ltd | Professional & scientific | 2011 |
| Worldwide POS Management LLP | | 2011 |
| Worship Backing Band Limited | Information & communication | 2004 |
| Worth Scaffolding Company Limited | Construction | 2008 |
| Worthington Accountancy Ltd | Professional & scientific | 2012 |
| WP Group Limited | Energy | 2007 |
| WP Property Group Limited | Real estate | 2023 |
| WZN Solutions Ltd | Professional & scientific | 2025 |
| XDA Consulting Ltd | Professional & scientific | 2016 |
| Yari Homes Limited | Real estate | 2023 |
| Yashvee Ltd | Administrative & support | 2017 |
| Yearwood Solutions Limited | Information & communication | 2016 |
| Yeoman House Management Limited | Households | 2000 |
| YES SHE Cannes Ltd | Wholesale & retail | 2024 |
| Yesilyurt Food Ltd | Hospitality | 2026 |
| Yomi Group Ltd | Real estate | 2026 |
| York Investments (UK) Ltd | Professional & scientific | 2010 |
| York Properties Limited | Real estate | 1998 |
| Yota Property Limited | Real estate | 2025 |
| Yotei Living Opco Ltd | Manufacturing | 2025 |
| Your Experience Machine Ltd | Information & communication | 2026 |
| Yudsons Ltd | Construction | 2013 |
| Yuloan Limited | Administrative & support | 2024 |
| Yurt Design Limited | Professional & scientific | 2014 |
| Zanyar Chenar Barbershop Ltd | Other services | 2025 |
| Zaowoman Ltd | Health & social care | 2024 |
| Zapata! Records Ltd | Information & communication | 2023 |
| Zayman’S Group Ltd | Wholesale & retail | 2026 |
| Zaza Music Ltd | Information & communication | 2010 |
| Zebtech Limited | Information & communication | 2003 |
| Zero Delta Ltd | Wholesale & retail | 2025 |
| Zone Data Ltd | Wholesale & retail | 2007 |
| Zone Developments Limited | Real estate | 2019 |
| Zumani Ltd | Wholesale & retail | 2012 |
| Zygote Ltd | Professional & scientific | 2026 |