| West Sussex Psychology Limited | Health & social care | 2025 |
| West Sussex Renovation Limited | Construction | 2025 |
| West Sussex Surveyors Limited | Professional & scientific | 2017 |
| Westlake Management Company Limited | Households | 1974 |
| Westpalm Properties Limited | Administrative & support | 2002 |
| Wetpalm Cleaning Services UK Limited | Administrative & support | 2023 |
| Wharne Developments Limited | Households | 1962 |
| Wheatcroft 1958 Limited | Extraterritorial | 2014 |
| Wheelwrights Close Management Limited | Households | 2000 |
| Whisky Vault Auctions Ltd | Wholesale & retail | 2016 |
| White Composites Engineering Limited | Manufacturing | 2011 |
| White Mirror Accountancy Ltd | Financial services | 2024 |
| Whiteknight Property Management Limited | Households | 2003 |
| Whites Food Ltd | Hospitality | 2025 |
| Whittington and Co Estate Letting Agent Limited | Households | 2015 |
| Whytes Property Services Ltd | Construction | 2020 |
| Wick Books Ltd | Administrative & support | 2022 |
| Wick Express Ltd | Wholesale & retail | 2013 |
| Wick Football Club (Sussex) CIC | Arts & recreation | 2023 |
| Wilbury House (Management) RTM Company Ltd | Households | 2020 |
| Wild Botanica Limited | Health & social care | 2017 |
| Wildbhives CIC | Manufacturing | 2021 |
| Wildflower Home Help Ltd | Health & social care | 2026 |
| Wildtrax Electronics (UK) Limited | Manufacturing | 1998 |
| Wilkinson Dispensing Limited | Health & social care | 2014 |
| Willcox Healthcare Consultancy Ltd | Professional & scientific | 2025 |
| William G Dick Partnership LLP | | 2002 |
| William Osborne Services Limited | Real estate | 2010 |
| Williams & Sons (West Sussex) Ltd | Wholesale & retail | 1997 |
| Willow Court (Rustington) Management Company Limited | Real estate | 2014 |
| Willowhayne Mews Residents (2) Limited | Households | 2010 |
| Willowhayne Mews Residents Limited | Households | 2009 |
| Willowhayne Residents' Association Limited | Households | 1974 |
| Willsons Plumbing & Heating Supplies Limited | Wholesale & retail | 2025 |
| Wilson Props Ltd | Construction | 2025 |
| Wiltshire Croft Court Management Company Limited | Households | 2003 |
| Wimbish Homes Limited | Construction | 2006 |
| Windgen Europe Limited | Energy | 2025 |
| Windmill House Littlehampton Management Limited | Households | 1988 |
| Windsor Kitchen & Bathrooms Limited | Construction | 2019 |
| Windward Grove Ltd | Real estate | 2018 |
| Wineware (Racks & Accessories) Limited | Wholesale & retail | 2000 |
| Winnie Davies Ltd | Real estate | 2025 |
| Winston Business Centre Freehold Company Limited | Real estate | 2013 |
| Winston Business Centre Management Company Limited | Real estate | 2013 |
| Winterberry Catering Limited | Manufacturing | 2023 |
| Winware Ltd | Wholesale & retail | 2014 |
| Wire & Test Ltd | Manufacturing | 2015 |
| Wisdom Financial Services Ltd | Financial services | 2020 |
| Wise Tree OIL Limited | Manufacturing | 2021 |
| Wixworks Ltd | Information & communication | 2020 |
| Women in Wheels Ltd | Other services | 2018 |
| Woodbridge Park Management Limited | Hospitality | 1988 |
| Woodlands Court Rustington Limited | Households | 2010 |
| Woodlands House Care Home Limited | Health & social care | 2021 |
| Woodside Court Residents' Association Limited | Households | 1967 |
| Woodson Kitchen Contractors Limited | Construction | 2012 |
| Workplace Recruitment Vehicles Ltd | Administrative & support | 2022 |
| Works Interactive Limited | Professional & scientific | 2014 |
| Worktop Fabricators Federation | Other services | 2019 |
| World Food Safety Organisation Limited | Administrative & support | 2002 |
| Worthing Anaesthetic Consultants Limited | Administrative & support | 2010 |
| Worthing Washeteria Services Limited | Administrative & support | 2016 |
| Worthing Wolverines Football Club Ltd | Arts & recreation | 2026 |
| Wozuma Ltd | Information & communication | 2023 |
| WXL & Co Ltd | Hospitality | 2017 |
| Wychwood Park (Haywards Heath) Management Company Limited | Households | 2019 |
| Wynn Engineering Limited | Professional & scientific | 2016 |
| Xollo Prime Ltd | Construction | 2018 |
| Xtreme Tyres & Autocare Plus Ltd | Wholesale & retail | 2025 |
| Yaba Chinese Restaurant Ltd | Hospitality | 2025 |
| Yapton Community Pre-School | Education | 2004 |
| York Gardens Management Company Limited | Households | 1969 |
| York Lodge Management Company Limited | Households | 1961 |
| Your Sales Partners Ltd | Administrative & support | 2020 |
| Your Trading Group Ltd | Wholesale & retail | 2016 |
| Zachdye Ltd | Wholesale & retail | 2025 |
| Zealtask Limited | Information & communication | 1982 |
| Zero Energy Systems Limited | Construction | 2006 |
| Zhro Ltd | Education | 2019 |
| Zoptic Limited | Professional & scientific | 1999 |
| ZTF Power Limited | Manufacturing | 2006 |
| ZTF Properties Limited | Real estate | 2021 |