| Wiltshire Biomass Limited | Professional & scientific | 2006 |
| Wiltshire Brazilian JIU Jitsu Academy Limited | Arts & recreation | 2021 |
| Wiltshire Build Solutions Ltd | Construction | 2020 |
| Wiltshire Caravan Storage (Swindon) Ltd | Transport & logistics | 2018 |
| Wiltshire Darts House Ltd | Arts & recreation | 2026 |
| Wiltshire Energy Limited | Manufacturing | 2016 |
| Wiltshire Extensions & Renovations Limited | Manufacturing | 2024 |
| Wiltshire Fertility Centre Limited | Health & social care | 2009 |
| Wiltshire Flooring Services Ltd | Construction | 2018 |
| Wiltshire Golf Limited | Arts & recreation | 2017 |
| Wiltshire Homes Limited | Real estate | 2015 |
| Wiltshire Hotel Leisure and Golf Limited | Hospitality | 2012 |
| Wiltshire Laminators Limited | Manufacturing | 2007 |
| Wiltshire Law Centre | Professional & scientific | 1984 |
| Wiltshire Loft Conversions Ltd | Construction | 2020 |
| Wiltshire Onsite Electrical Limited | Construction | 2021 |
| Wiltshire Pharma Ltd | Professional & scientific | 2016 |
| Wiltshire Property Developments Limited | Construction | 2014 |
| Wiltshire Psychology Service Limited | Health & social care | 2011 |
| Wiltshire RAW Pet Foods Ltd | Wholesale & retail | 2021 |
| Wiltshire Roofing & Building Ltd | Construction | 2025 |
| Wiltshire Scaffolding Ltd | Construction | 2025 |
| Wiltshire Scuba Training & Servicing Ltd | Professional & scientific | 2025 |
| Wiltshire Tiling & Plumbing Ltd | Construction | 2021 |
| Wiltshire Tiling Contractors Ltd | Construction | 2025 |
| Wiltshire Vehicle Sales Limited | Wholesale & retail | 2015 |
| Wiltshire Waste Ltd | Extraterritorial | 2022 |
| Wiltshire Wild Sauna Ltd | Other services | 2024 |
| Wiltshire Windows Ltd | Other services | 2018 |
| Win-Win International Business Ltd | Wholesale & retail | 2024 |
| Winchester Symphony Orchestra Productions Limited | Arts & recreation | 2025 |
| Wincout Ltd | Transport & logistics | 2025 |
| Wind River UK Limited | Information & communication | 1991 |
| Windhoff UK Limited | Manufacturing | 2015 |
| Windmill IT Services Limited | Information & communication | 2008 |
| Windmill Stud Ltd | Agriculture & fishing | 2015 |
| Windowology Limited | Construction | 1996 |
| Windows by Design Limited | Construction | 2004 |
| Windrover Limited | Professional & scientific | 2003 |
| Windsor Road (Swindon) Residents Limited | Households | 1976 |
| Windswept Properties Limited | Households | 2017 |
| Windy Ridge Flat Management Company Limited | Households | 2005 |
| Wings Doctor Ltd | Hospitality | 2023 |
| Winklemania Productions Limited | Information & communication | 1986 |
| Winners (Swindon) Limited | Real estate | 1994 |
| Winnersh Holdings LP | | 2013 |
| Winnwell Limited | Real estate | 2016 |
| Winshaw Design & Build Limited | Construction | 2020 |
| Winshill Consultancy Ltd | Professional & scientific | 2022 |
| Wintek Solutions Limited | Wholesale & retail | 2012 |
| Winter Orchis Trade Ltd | Wholesale & retail | 2024 |
| Winter Trustees Limited | Professional & scientific | 2024 |
| Wireless Evolution Ltd | Information & communication | 2023 |
| Wiremasters UK Limited | Wholesale & retail | 2023 |
| Wise Accounts Ltd | Professional & scientific | 2026 |
| Wiser Solutions Ltd | Transport & logistics | 2019 |
| Witcombe Green Limited | Households | 1979 |
| Witgrip Ltd | Professional & scientific | 2018 |
| Withaness Ltd | Real estate | 2018 |
| Witheymedia Ltd | Professional & scientific | 2014 |
| Witney Grain Limited | Agriculture & fishing | 2001 |
| Witts Collections Services Ltd | Administrative & support | 2026 |
| Wizard Theatre Limited | Arts & recreation | 2015 |
| WJC Services (Swindon) Ltd | Manufacturing | 2013 |
| WJL Aerospace Solutions Ltd | Manufacturing | 2024 |
| WJO LLP | | 2020 |
| WJO Martial Arts Limited | Arts & recreation | 2011 |
| Wksa Liverpool LLP | | 2023 |
| WL Mobile Valeting Ltd | Other services | 2019 |
| WLF Limited | Information & communication | 2022 |
| Wlts Limited | Extraterritorial | 2021 |
| WMB Electrical Services Ltd | Construction | 2019 |
| WMG Media Limited | Information & communication | 2010 |
| WO1 Limited | Other services | 2024 |
| Wood Futures Ltd | Administrative & support | 2024 |
| Woodbell Limited | Wholesale & retail | 2022 |
| Woodberry Enterprises Limited | Wholesale & retail | 2015 |
| Woodbridge Park Estates Ltd | Real estate | 2022 |
| Woodcroft Services LLP | | 2024 |
| Woodcutters Mews Management Company Limited | Households | 2007 |
| Wooden Floor Sanding and Restoration Ltd | Construction | 2025 |
| Wooden Toy Store Limited | Wholesale & retail | 2008 |
| Woodgreen Contracts Ltd | Construction | 2022 |
| Woodland Business Analytics Ltd | Professional & scientific | 2008 |
| Woodleaze Developments Limited | Construction | 2022 |
| Woodleaze Groundworks and Civil Engineering Ltd | Construction | 2019 |
| Woodleaze Plant Hire Limited | Administrative & support | 2022 |
| Woodleaze Remediation Limited | Construction | 2022 |
| Woodology Solutions Limited | Construction | 2019 |
| Woodshavings Limited | Extraterritorial | 2013 |
| Woodsite Limited | Real estate | 2001 |
| Woodsmith Enterprise Limited | Information & communication | 2025 |
| WOODSTREET88 Limited | Real estate | 2023 |
| Woodward Installations Limited | Construction | 2024 |
| Woody's Water Utilities Ltd | Construction | 2026 |
| Woodyard Interiors Limited | Other services | 2023 |
| Woofography Ltd | Professional & scientific | 2023 |
| Woolford Construction Limited | Construction | 2015 |
| Woolford Ltd | Real estate | 2019 |
| Woolley Kitchens & Bathrooms Limited | Construction | 2019 |