| WOW World Group Limited | Education | 2017 |
| WOW World Group Programmes CIC | Education | 2021 |
| WPF Alderholt Limited | Agriculture & fishing | 2004 |
| Wram Limited | Real estate | 2004 |
| Wrfc Trading Limited | Arts & recreation | 1996 |
| Wring Property Ltd | Real estate | 2024 |
| Wuantag RTM Company Limited | Households | 2007 |
| Wyatt Attachment Solutions Limited | Manufacturing | 2022 |
| Wyatt Williams Limited | Professional & scientific | 2001 |
| Wychbury Fields (Hagley) Management Company Limited | Households | 2014 |
| Wychbury Fields Apartments (Hagley) Management Company Limited | Households | 2017 |
| Wychbury Lawns (Hagley) Management Company Limited | Households | 2014 |
| Wychbury Lawns Apartments (Hagley) Management Company Limited | Households | 2014 |
| Wykeham Vale (Wickham) Management Company Limited | Households | 2019 |
| Wykes Brickwork Ltd | Construction | 2020 |
| Wylye Capital Ltd | Financial services | 2023 |
| Wylye Court Management Company Limited | Households | 1985 |
| Wylye Valley Caravan Storage Ltd | Transport & logistics | 2021 |
| Wylye Valley Holdings Limited | Professional & scientific | 2019 |
| Wyndham Park (Salisbury) Limited | Real estate | 1995 |
| Wyndham Place Management Company Limited | Households | 2013 |
| WYNDHAM61 Ltd | Real estate | 2021 |
| X-1 Solutions Ltd | Professional & scientific | 2022 |
| Xadon Limited | Administrative & support | 2000 |
| Xantia Spas Ltd | Manufacturing | 2022 |
| Xclusive Hair Salon Limited | Other services | 2016 |
| XGO Logistics Ltd | Transport & logistics | 2021 |
| Xpress Business Solutions Ltd | Water & waste | 2009 |
| Xpress Half Price Furniture Ltd | Wholesale & retail | 2019 |
| Xrats Ltd | Information & communication | 2024 |
| Xterior Solutions Landscaping Ltd | Administrative & support | 2018 |
| Yadav Associates Ltd | Administrative & support | 2023 |
| Yanda Software Limited | Administrative & support | 2019 |
| Yarmouth Hospitality Limited | Hospitality | 2023 |
| Yate Pizza Ltd | Hospitality | 2005 |
| Yearsley House (10-21) RTM Company Limited | Households | 2016 |
| Yeatman-Biggs Trustees Limited | Professional & scientific | 2021 |
| Yeats Pvcu Installations Limited | Construction | 2019 |
| Yella Mickey Limited | Arts & recreation | 2011 |
| YEW Tree Mortgages Ltd | Financial services | 2026 |
| Yggdrasil Capital UK Ltd | Professional & scientific | 2024 |
| Yoauto Ltd | Professional & scientific | 2019 |
| Yoga New Life Ltd | Extraterritorial | 2020 |
| Yoke AI Limited | Information & communication | 2023 |
| Yolarch Consulting Ltd | Professional & scientific | 2024 |
| York House (Rotton Park Road) Management Company Limited | Construction | 2012 |
| Young's Foot Clinic Limited | Health & social care | 2020 |
| Youngs Management Services Ltd | Transport & logistics | 2024 |
| Your Mortgage Expert Limited | Financial services | 2014 |
| Your Only Young Once Ltd | Hospitality | 2020 |
| Your Taxi LLP | | 2014 |
| Ysgol Maes Dyfan (Barry) Residents Management Company Limited | Households | 2015 |
| Z E Europe Limited | Manufacturing | 2012 |
| Z E Int'L Limited | Manufacturing | 2010 |
| ZAC Shaw Ltd | Information & communication | 2017 |
| Zaccariello Markets Ltd | Wholesale & retail | 2025 |
| Zancast Ltd | Manufacturing | 2020 |
| Zasarch Limited | Real estate | 2024 |
| ZE Technologies Limited | Manufacturing | 2012 |
| ZEG Holdings Ltd | Administrative & support | 2021 |
| Zelemiq Life Science Limited | Professional & scientific | 2023 |
| Zelemiq Ltd | Professional & scientific | 2017 |
| Zelemiq.Health Ltd | Health & social care | 2021 |
| ZEN Property Services Limited | Real estate | 2022 |
| Zened Limited | Professional & scientific | 2015 |
| Zenith Fuel Systems Limited | Extraterritorial | 1986 |
| Zephen Farms Limited | Agriculture & fishing | 2005 |
| Zephen Limited | Professional & scientific | 1996 |
| Zephen NO.3 Limited | Real estate | 2002 |
| Zephen Properties Limited | Real estate | 2009 |
| Zephen Residential Limited | Real estate | 2015 |
| Zephyr Place Management Company Limited | Households | 2025 |
| Zephyr Sawmills Limited | Manufacturing | 2024 |
| Zerocable Limited | Real estate | 1995 |
| Zest MVT Limited | Arts & recreation | 2026 |
| Zeus Scaffolding Ltd | Construction | 2024 |
| ZGC Solutions Limited | Professional & scientific | 2024 |
| ZHU Consulting Ltd | Professional & scientific | 2024 |
| ZIA Pizza Salisbury Ltd | Hospitality | 2026 |
| Zigzag Training Limited | Administrative & support | 2004 |
| Zingera CIC | Education | 2023 |
| Zivico Limited | Wholesale & retail | 2023 |
| ZLS Scheduling Limited | Extraterritorial | 2014 |
| ZOE COX Ltd | Professional & scientific | 2015 |
| Zombie Flesh Eaters Ltd | Information & communication | 2024 |
| ZOO Events Group Limited | Administrative & support | 2014 |
| Zooloos Limited | Extraterritorial | 2013 |
| Zoral Limited | Information & communication | 2002 |
| Zoral Services Limited | Administrative & support | 2007 |
| Zuke Communications Ltd | Other services | 2015 |
| Zuto Consultancy Ltd | Professional & scientific | 2015 |