| WE Search People Limited | Administrative & support | 2021 |
| WE SEE Studios Ltd | Professional & scientific | 2023 |
| Weaid Care Ltd | Health & social care | 2023 |
| Weald Organics Ltd | Manufacturing | 2021 |
| Weathercourt Limited | Extraterritorial | 2016 |
| Weave Haus Ltd | Manufacturing | 2025 |
| Weavers Residents (Swindon) Limited(The) | Households | 1979 |
| Web Fixstar Ltd | Information & communication | 2011 |
| WEB3 ADS Ltd | Professional & scientific | 2025 |
| Webber Proud Limited | Professional & scientific | 2025 |
| Webbpaton LLP | | 2023 |
| Webcite Technology Systems Ltd | Information & communication | 2025 |
| Webinar 4 Business Ltd | Education | 2023 |
| Webiq Analytics Limited | Information & communication | 2025 |
| Webliora Ltd | Construction | 2025 |
| Webspark Studio Ltd | Information & communication | 2025 |
| Webspinners Ltd | Information & communication | 2007 |
| Websters Group Limited(The) | Professional & scientific | 1954 |
| Wedding Cars Swindon Ltd | Transport & logistics | 2023 |
| Weeannie Ltd. | Professional & scientific | 2016 |
| Weebuzz Limited | Hospitality | 2023 |
| Weenie Fiats Limited | Wholesale & retail | 2007 |
| Wegrzyn-Trans Limited | Transport & logistics | 2013 |
| Weighbridge Barn Limited | Hospitality | 2008 |
| WEL 14869201 Limited | Administrative & support | 2023 |
| WEL Construction Ltd | Construction | 2021 |
| Welch Investments Ltd | Financial services | 2014 |
| Welcome Motors Ltd | Wholesale & retail | 2011 |
| Welfare Assessment Technologies Ltd | Information & communication | 2024 |
| Welkinty Construction Ltd | Construction | 2021 |
| Well Catered Ltd | Hospitality | 2019 |
| Wellbeing Technologies Ltd | Information & communication | 2022 |
| Wellcrowd Ltd | Information & communication | 2023 |
| Weller Investments Limited | Households | 1977 |
| Wellesbourne Best Kebab Ltd | Hospitality | 2026 |
| Wellington George Holdings Ltd | Real estate | 2015 |
| Wellington House RTM Company Limited | Households | 2023 |
| Wellpark Kensington Limited | Administrative & support | 2009 |
| Wells Bespoke Installations Ltd | Manufacturing | 2025 |
| Wells Electrical Services Limited | Construction | 2006 |
| Wellspring Oasis Properties Limited | Real estate | 2008 |
| Welmore (Oxford) Limited | Professional & scientific | 2023 |
| Wembley Choi Kwang DO LLP | | 2022 |
| Wemimo Aremo Ltd. | Professional & scientific | 2017 |
| Wemyss Lodge Limited | Health & social care | 2002 |
| Wentro Limited | Other services | 2023 |
| Wernham Properties Ltd | Real estate | 2025 |
| Wesl 02653264 Limited | Administrative & support | 1991 |
| Wessex Ceilings (South West) Ltd | Construction | 2022 |
| Wessex Ceilings Ltd | Construction | 2018 |
| Wessex Court RTM Company Limited | Households | 2012 |
| Wessex Potatoes Limited | Wholesale & retail | 2012 |
| Wessex Waste Limited | Administrative & support | 2013 |
| Wessex WAX Properties Limited | Real estate | 1998 |
| West Country Vehicles Limited | Wholesale & retail | 1998 |
| West One Limousines Limited | Transport & logistics | 2002 |
| West One Swindon Laundry Ltd | Other services | 2025 |
| West Shires Property Limited | Real estate | 2022 |
| West Swindon Hand Car Wash Ltd | Other services | 2010 |
| West Tailoring & Alterations Ltd | Administrative & support | 2016 |
| Westacre Estates Ltd | Real estate | 2000 |
| Westbarn Estates Limited | Real estate | 2015 |
| Westbarn Holdings Limited | Financial services | 2015 |
| Westbikes Limited | Wholesale & retail | 2014 |
| Westbourne House (Swindon) Management Company Limited | Other services | 2016 |
| Westbury Kitchens Ltd | Construction | 2018 |
| Westbury Mews Management Limited | Households | 1993 |
| Western Audio Studios Ltd | Information & communication | 2022 |
| Western Care 247 Ltd | Health & social care | 2020 |
| Western Face Ltd | Wholesale & retail | 2023 |
| Westlea Rise (Swindon) Management Company Limited | Households | 2016 |
| Westleaze Limited | Real estate | 2024 |
| Westlecot Estates Ltd | Real estate | 2005 |
| Westlecot Limited | Real estate | 2015 |
| Westlecot Road Limited | Construction | 2024 |
| Westmead Motors Ltd | Wholesale & retail | 2023 |
| Westmead Plumbing Supplies Ltd | Wholesale & retail | 2009 |
| Westmill Partnership LLP | | 2025 |
| Westmill Smartgrid and Storage Community Interest Company | Extraterritorial | 2015 |
| Westmill Woodland Burial Ground C.I.C. | Agriculture & fishing | 2013 |
| Westminster Commission for Road Air Quality Ltd | Professional & scientific | 2020 |
| Weston & SON Ltd | Construction | 2019 |
| Weston & SON Property Ltd | Real estate | 2022 |
| Westrop Medical Services Limited | Wholesale & retail | 2018 |
| Weststar Electrical Limited | Wholesale & retail | 1987 |
| Weststar Transport Swindon Ltd | Transport & logistics | 2024 |
| Westview Court Management Company Limited | Households | 2004 |
| Westwire Harnessing Limited | Manufacturing | 1987 |
| Westwise Engineering Limited | Construction | 1999 |
| WET TOE Productions Ltd | Information & communication | 2020 |
| WGH Group Limited | Water & waste | 2011 |
| WGS Power & Lighting Ltd | Construction | 2005 |
| WH Smith (Qatar) Limited | Extraterritorial | 2012 |
| WH Smith 1955 Limited | Professional & scientific | 1955 |
| WH Smith Group Limited | Professional & scientific | 2023 |
| WH Smith Hospitals Holdings Limited | Professional & scientific | 1999 |
| WH Smith Hospitals Limited | Wholesale & retail | 2000 |
| WH Smith HS Limited | Professional & scientific | 2024 |
| WH Smith Online Limited | Professional & scientific | 2024 |
| WH Smith Pension Trustees Limited | Financial services | 1978 |