| Westan Holdings Limited | Financial services | 2023 |
| Westan Properties Limited | Real estate | 2006 |
| Westbarn Inns Ltd | Hospitality | 2008 |
| Westbourne Capital Ltd | Real estate | 2023 |
| Westbourne Therapy Clinic Limited | Health & social care | 2018 |
| Westbriar Limited | Households | 1995 |
| Westbrook Residents Association Limited | Households | 1985 |
| Westbrooke Developments Limited | Construction | 1946 |
| Westbrooke Investments Limited | Real estate | 1951 |
| Westbrooke Management Limited | Real estate | 1962 |
| Westbury Court Limited | Households | 2003 |
| Westchester Properties Limited | Real estate | 2018 |
| Westcombe Residents Association Limited | Households | 1958 |
| Westermain Limited | Health & social care | 1984 |
| Western Place Property Management Limited | Real estate | 2001 |
| Western Power Distribution Nomineeco Limited | Agriculture & fishing | 2020 |
| Westfield Investments Limited | Real estate | 1996 |
| Westholme Clinic Limited | Health & social care | 1992 |
| Westingham Ltd | Professional & scientific | 2024 |
| Westlake Building Contractors Ltd | Construction | 2011 |
| Westlands Ferring Limited | Other services | 2015 |
| Weston Developments Limited | Construction | 2023 |
| Westpark Mortgages Limited | Financial services | 2024 |
| Westrow Homes Developments Limited | Construction | 2021 |
| WG Social Limited | Information & communication | 2022 |
| WGS Property Holdings Limited | Real estate | 2020 |
| What IF & WHY NOT Ltd | Arts & recreation | 2002 |
| What's Good Podcast Ltd | Information & communication | 2020 |
| Wheeldon Junior Training Limited | Arts & recreation | 2012 |
| Wheeldon OFF Road Centre Limited | Arts & recreation | 2012 |
| Wherescheapest Ltd | Information & communication | 2000 |
| Whibleys Holdings Limited | Financial services | 2017 |
| Whistler FIC Limited | Financial services | 2025 |
| White & White Studio Ltd | Professional & scientific | 2023 |
| White Box Health Economics Ltd | Professional & scientific | 2012 |
| White Horse International Limited | Financial services | 2024 |
| White Lion Consulting Ltd | Information & communication | 2003 |
| White Services Limited | Health & social care | 2001 |
| Whitebeam Securities | Financial services | 1959 |
| Whitegate Systems Ltd | Manufacturing | 1996 |
| Whitelaw Estates Limited | Construction | 1987 |
| Whites Removals & Storage Ltd | Transport & logistics | 2023 |
| Whitespace Developments Limited | Real estate | 2005 |
| Whittall Properties Limited | Real estate | 2015 |
| Whole HOG Creations Ltd | Information & communication | 2009 |
| Wholesale Catering Supplies (Sussex) Ltd | Hospitality | 2020 |
| Wholesale Catering Supplies Limited | Wholesale & retail | 2008 |
| WHY Wait Studios Limited | Information & communication | 2018 |
| Whyte Development Holdings Limited | Construction | 2024 |
| Whyte Developments Limited | Construction | 2018 |
| Wide Design Limited | Professional & scientific | 2013 |
| Wigmore Property Limited | Real estate | 2023 |
| Wigmore Trading Limited | Hospitality | 2018 |
| WIL Property Limited | Real estate | 2006 |
| Wilbury Freehold Limited | Real estate | 2022 |
| Wilbury Property Ltd | Real estate | 2021 |
| Wilco Freeholders Limited | Households | 2002 |
| Wild Arts Atelier LLP | | 2023 |
| Wild Gathering CIC | Education | 2021 |
| Wildash & Davies Limited | Professional & scientific | 1965 |
| Wildchild Studios Limited | Information & communication | 2025 |
| Wildcuts Venison & Game Ltd | Manufacturing | 2026 |
| Wildebeest Investments Ltd | Real estate | 2024 |
| Wildecroft Group Ltd | Administrative & support | 2025 |
| Wildflower Jewellery Limited | Wholesale & retail | 2020 |
| Wilding & Wolfe Limited | Professional & scientific | 2009 |
| Wildtongs Limited | Transport & logistics | 2024 |
| Wilkin and Wilkin Ltd | Wholesale & retail | 2010 |
| Wilkinson Renovations Ltd | Construction | 2025 |
| Will Power Worthing Limited | Other services | 2014 |
| Will Tech Development Ltd | Information & communication | 2023 |
| William Carey (Services) Limited | Wholesale & retail | 2005 |
| William Cult Agency Ltd | Manufacturing | 2019 |
| William James Living Limited | Real estate | 2017 |
| William Scott Foundation Limited | Arts & recreation | 2006 |
| Willingdon Court Limited | Real estate | 1959 |
| Willmore Phillips Limited | Construction | 2012 |
| Willoughby Swann Limited | Real estate | 1996 |
| Willow and Spade Ltd | Wholesale & retail | 2025 |
| Willow Court (Worthing) Management Limited | Households | 1960 |
| Willow Family Care Ltd | Health & social care | 2024 |
| Willow Farm Estates Ltd | Real estate | 2014 |
| Willowmile Limited | Real estate | 2002 |
| Wilmington Homes Limited | Real estate | 2005 |
| Wilson Bookkeeping Services Ltd | Administrative & support | 2019 |
| Wilson Living Ltd. | Real estate | 2016 |
| Wilton Student Developments (Egerton) Ltd | Real estate | 2019 |
| Winchester 17 Freehold Ltd | Households | 2020 |
| Winchester Court Worthing Maintenance Limited | Households | 1967 |
| Windmill Drive Management Ltd | Households | 2015 |
| Windover Bikes Limited | Manufacturing | 2021 |
| Window Installations (Sussex) Ltd | Construction | 2025 |
| Windowhaus Group Ltd | Wholesale & retail | 2026 |
| Windsor Capital Management Ltd | Financial services | 2013 |
| Windsor Court (Worthing) Limited | Households | 2000 |
| Wine Divine Ltd | Wholesale & retail | 2005 |
| Wineance Limited | Professional & scientific | 2021 |
| Wineflow Freight Forwarding Ltd | Transport & logistics | 2002 |
| Wing WAH Worthing Limited | Wholesale & retail | 2025 |
| Wingrove Sports Creations Limited | Arts & recreation | 2015 |