| William Chubb Limited | Information & communication | 2006 |
| William Hinton Limited | Professional & scientific | 1998 |
| William Morris Surveys Limited | Professional & scientific | 2018 |
| William Morrison (Pershore) Limited | Construction | 2015 |
| William Unwin Design & Build Ltd | Construction | 2017 |
| Williams Aviation Limited | Transport & logistics | 2014 |
| Williams Prestbury Limited | Financial services | 2012 |
| Williamson Investments Ltd | Real estate | 2018 |
| Willingdon Ground Works Limited | Construction | 2020 |
| Willington DC Limited | Information & communication | 2025 |
| Willington NG Limited | Energy | 2023 |
| Willmore Group Ltd | Real estate | 2025 |
| Willow and Gray Limited | Construction | 2026 |
| Willow Collect Ltd | Construction | 2026 |
| Willow Construction (Midlands) Ltd | Construction | 2003 |
| Willow Grove & Bluebell Chase (Blackburn) Management Company Limited | Households | 2025 |
| Willow Hospitality Ltd | Hospitality | 2025 |
| Willow Talent Ltd | Administrative & support | 2026 |
| Willowdash Ltd | Wholesale & retail | 2024 |
| Willowdene Limited | Real estate | 2011 |
| Wills 2 Succeed (Storage) Limited | Other services | 2008 |
| Wills 2 Succeed Ltd | Financial services | 2007 |
| Wills Ventures Limited | Real estate | 2019 |
| Wilmarnic Limited | Financial services | 2020 |
| Wilmot Property Solutions Ltd | Real estate | 2015 |
| Wilson Global Strategy Consultants Limited | Other services | 2017 |
| Wilson Property Ventures Ltd | Construction | 2026 |
| Wilts Heart Limited | Health & social care | 2019 |
| Wiltshire & Somerset Cleaning Ltd | Administrative & support | 2026 |
| Wiltshire Land Limited | Professional & scientific | 2010 |
| Wimperis Embroidery Limited | Arts & recreation | 2020 |
| Wincanton Races Company Limited(The) | Extraterritorial | 1912 |
| Winchcombe Arts & Community Hub | Arts & recreation | 2023 |
| Winchcombe Cross Management Company Ltd | Households | 2025 |
| Winchcombe Cycling Club | Arts & recreation | 2012 |
| Winchcombe Garage Limited | Wholesale & retail | 2012 |
| Winchcombe Legal Services Limited | Administrative & support | 2024 |
| Winchcombe PIE Company Ltd | Manufacturing | 2026 |
| Winchcombe Pottery Limited | Manufacturing | 1966 |
| Winchcombe Private Hire Ltd | Extraterritorial | 2014 |
| Winchcombe Railcars Limited | Transport & logistics | 2025 |
| Winchcombe Restaurant Food of India Ltd | Hospitality | 2021 |
| Winchcombe Street Management Company Limited | Administrative & support | 1999 |
| Winchcombe Tennis Club | Arts & recreation | 2019 |
| Winchcombe Tyres Ltd | Wholesale & retail | 2023 |
| Winchham Consulting Limited | Professional & scientific | 2015 |
| Wincomply Service UK Limited | Information & communication | 2023 |
| Wincraft Music Limited | Arts & recreation | 2002 |
| Wincraft Tours Limited | Arts & recreation | 1997 |
| Windeler Ltd | Wholesale & retail | 2020 |
| Windoor Workshop Ltd | Manufacturing | 2018 |
| Windowhunter Ltd | Wholesale & retail | 2016 |
| Windrush Car Storage Holdings Limited | Transport & logistics | 2020 |
| Windrush Car Storage Limited | Transport & logistics | 2010 |
| Windrush Court Management Limited | Real estate | 1997 |
| Windrush Garden Cafe Limited | Extraterritorial | 2010 |
| Windrush Simulated Ltd | Arts & recreation | 2023 |
| Windrush Sporting Society Limited | Arts & recreation | 2014 |
| Windsor Street Management Company Limited | Real estate | 2019 |
| Wineicecream Ltd | Manufacturing | 2019 |
| Wingfield House Management Company Limited | Real estate | 1983 |
| Wingplay Limited | Real estate | 1989 |
| Wingplus Limited | Real estate | 1983 |
| Wingpoint Limited | | 1987 |
| Wings 4 Growth Limited | Education | 2024 |
| Winkere Ltd | Health & social care | 2019 |
| Winnens 1929 Ltd. | Wholesale & retail | 2016 |
| Winthisnow Competitions Ltd | Wholesale & retail | 2023 |
| Winton House Limited | Education | 2023 |
| Wire Direct Limited | Professional & scientific | 1999 |
| Wired Differently App Limited | Health & social care | 2022 |
| WIRED360 UK Limited | Professional & scientific | 2024 |
| Wireless Noise Limited | Administrative & support | 2022 |
| Wirralmsk Ltd | Health & social care | 2026 |
| Wiseman Property Holdings Limited | Real estate | 2020 |
| Wisemoney.Com Limited | Administrative & support | 1998 |
| Wisteria Hill Technologies Limited | Information & communication | 2023 |
| Witan Media Limited | Information & communication | 2011 |
| With a K Limited | Information & communication | 2004 |
| Withers Fruit Farm Limited | Agriculture & fishing | 2015 |
| Within Reach (South West) Limited | Real estate | 2020 |
| Within Reach Services Limited | Health & social care | 2020 |
| Witney Court Management Company Limited | Households | 2011 |
| Wittering Legal Limited | Professional & scientific | 2024 |
| WJL Electrical Services Limited | Construction | 2009 |
| WJM and CPS Ltd | Wholesale & retail | 2025 |
| WJM Plumbing & Heating Ltd | Construction | 2023 |
| WJP Holdings Limited | Financial services | 2026 |
| WJW Engineering Ltd | Manufacturing | 2015 |
| Wkbl Property Limited | Real estate | 2024 |
| WL Fintech Solutions Ltd | Financial services | 2023 |
| WLF Decor Ltd | Construction | 2023 |
| WM Badgeworth Lane Limited | Construction | 2020 |
| WM Cirencester Limited | Construction | 2026 |
| WM Motors (Cheltenham) Limited | Wholesale & retail | 2006 |
| Wmsc Training Ltd | Other services | 2022 |
| WOF Property Holdings Limited | Administrative & support | 2021 |
| WOH Events Limited | Arts & recreation | 2020 |
| Wolf's Lair Limited | Professional & scientific | 2002 |
| Wolfe and Wolfe Publishing Limited | Information & communication | 2013 |