| Windmill Nurseries & Contractors Limited | Construction | 1955 |
| Windmill Topco Limited | Manufacturing | 2011 |
| Wine Express (Poundhill) Ltd | Wholesale & retail | 2022 |
| Winfield Property LLP | | 2020 |
| Wing Slingers Ltd | Hospitality | 2023 |
| Wingrou Pipe Technology Limited | Manufacturing | 2013 |
| Winners of Tomorrow Limited | Health & social care | 2019 |
| Winterdell Holdings Ltd | Financial services | 2023 |
| Winters Electrical Services Limited | Construction | 1991 |
| Winters Fire Services Limited | Administrative & support | 2006 |
| Wisborough Kitchens (UK) Ltd | Wholesale & retail | 2003 |
| Wisdom Property Investments Ltd | Real estate | 2012 |
| Wisdom Recruitment Services Limited | Administrative & support | 2008 |
| Wise Heart Communications Limited | Professional & scientific | 2015 |
| Wishfish Coaching and Development Ltd | Other services | 2015 |
| Wisit Ltd | Information & communication | 2019 |
| Withypitts Dahlias Ltd | Agriculture & fishing | 2012 |
| WJA Construction Limited | Construction | 2015 |
| WLA Logistics Ltd | Transport & logistics | 2025 |
| WLC Group Ltd | Administrative & support | 2014 |
| WMM Consultancy Ltd | Professional & scientific | 2025 |
| Wodo Limited | Information & communication | 2006 |
| Wolf Native Kitchen Ltd | Extraterritorial | 2016 |
| Wonder WON Food Ltd | Wholesale & retail | 2024 |
| Wondercave Limited | Wholesale & retail | 2023 |
| Wood Beam Carpenter Ltd | Construction | 2018 |
| Wood Simon Limited | Wholesale & retail | 2016 |
| Wood Station Ltd | Construction | 2019 |
| Woodland Building and Maintenance Limited | Real estate | 2004 |
| Woodland Commercial Limited | Construction | 1993 |
| Woody Paper Ltd | Manufacturing | 2020 |
| Woolmark International PTY Ltd | Administrative & support | 2007 |
| Worcestershire Chiropractic Ltd | Health & social care | 2015 |
| World COM Systems Limited | Information & communication | 2025 |
| World Karate Guild Ltd | Wholesale & retail | 2022 |
| World Ride Ltd | Wholesale & retail | 2026 |
| Worlds END Hair & Beauty Ltd | Other services | 2021 |
| Worlds END Hair and Beauty Academy Ltd | Other services | 2025 |
| Worldwide Express Logisitics Ltd | Transport & logistics | 2018 |
| Worldwide Travel Options Ltd | Administrative & support | 2016 |
| Worth Abbey | Other services | 2002 |
| Worth Abbey Construction Limited | Construction | 2000 |
| Worth Homes Limited | Construction | 1997 |
| Worth Leisure Ltd | Manufacturing | 2014 |
| Worth Property Ltd | Real estate | 2019 |
| Worth School Lettings Limited | Real estate | 2021 |
| WR Rappor Ltd | Information & communication | 2016 |
| Wrays Farm Estates & Services Ltd | Administrative & support | 2021 |
| WRD Carpentry & Building Ltd | Construction | 2023 |
| Wren Management Limited | Transport & logistics | 2015 |
| Writing With Light Productions Limited | Professional & scientific | 2025 |
| WSX Climbing Ltd | Arts & recreation | 2023 |
| Www.Isycandles.Com Ltd | Manufacturing | 2023 |
| Wyndham Hall Management Company Limited | Households | 2012 |
| Wystribe Ltd | Extraterritorial | 2015 |
| WZ Brunswick Ltd | Real estate | 2022 |
| X-Iv Events Limited | Administrative & support | 2022 |
| Xabia Limited | Real estate | 2022 |
| XAN Logistics Ltd | Transport & logistics | 2014 |
| Xavier Umbrella Solutions Limited | Professional & scientific | 2004 |
| Xcelsior Logistics Limited | Transport & logistics | 2020 |
| Xenica Consultancy Services Limited | | 2012 |
| Xenspace Ltd | Real estate | 2025 |
| Xside Ltd | Wholesale & retail | 2025 |
| Xstream Build Limited | Construction | 2026 |
| Xtra Travel Solutions Gatwick Ltd | Transport & logistics | 2023 |
| Xtratouch Beauty Hearth Ltd | Other services | 2023 |
| Xtrememart Ltd | Wholesale & retail | 2025 |
| Y S Beauty Limited | Other services | 2020 |
| Yaeba Studios Ltd | Information & communication | 2023 |
| Yaltay Limited | Other services | 2019 |
| Yanquoi Limited | Health & social care | 2018 |
| YAR Cottages Management Company Limited | Households | 2015 |
| Yarbi (Exim) Limited | Arts & recreation | 1989 |
| Yarnton Property Co Ltd | Real estate | 2014 |
| Yarwell Estates Limited | Hospitality | 2009 |
| Yasko Enterprises Ltd | Hospitality | 2018 |
| Yasko Gastronomy Group Limited | Hospitality | 2023 |
| Yasminsstudios Limited | Other services | 2024 |
| YB Plating Limited | Manufacturing | 2010 |
| Yellow Wealth Ltd | Real estate | 2019 |
| Yeoman and Beattie Holdings Ltd | Extraterritorial | 2020 |
| YG Fine Ltd | Wholesale & retail | 2025 |
| YHM Stores Limited | Wholesale & retail | 2016 |
| Yituan UK Limited | Hospitality | 2017 |
| YJB Enterprise Ltd | Real estate | 2020 |
| YN Logistics Ltd | Other services | 2017 |
| Yomi Universe Limited | Wholesale & retail | 2022 |
| Yora Pet Foods for the Planet Ltd | Manufacturing | 2017 |
| Yosan Ltd | Wholesale & retail | 2025 |
| Younique Hair Limited | Other services | 2013 |
| Your Cleaning Services Limited | Administrative & support | 2019 |
| Your Helpdesk Limited | Information & communication | 2024 |
| Your IT MAN Limited | Information & communication | 2011 |
| Your Safe Solutions Ltd. | Water & waste | 2008 |
| Your Secret Retreat Ltd | Other services | 2019 |
| Your Serenity Mind & Body CIC | Education | 2026 |
| Yourdaysrecruitment Ltd | Administrative & support | 2022 |
| YP Property Solutions Ltd | Real estate | 2025 |
| YSE Crawley Ltd | Hospitality | 2026 |