| White Utility Ltd | Construction | 2023 |
| Whitebridge Marine UK Ltd | Professional & scientific | 2026 |
| Whitehorse Maritime Academy Limited | Education | 2020 |
| Whitehorse Maritime Group Ltd | Financial services | 2022 |
| Whitehorse Maritime Limited | Extraterritorial | 2023 |
| Whitehouse Estate Management Limited | Wholesale & retail | 2010 |
| Whitemango Consulting Limited | Information & communication | 2023 |
| Whitemeadow Nursing Services Limited | Health & social care | 2015 |
| Whites Steel Ltd | Manufacturing | 2025 |
| Whitley & SON Ltd | Hospitality | 2023 |
| Whitmore Way Healthcare Limited | Wholesale & retail | 2024 |
| Wigan Station Cafe Ltd | Hospitality | 2022 |
| Wild Flame Ltd | Wholesale & retail | 2023 |
| William Hanbury Limited | Public administration | 2015 |
| Willies Wheels Limited | Manufacturing | 2025 |
| Willow & Wilde Ltd | Professional & scientific | 2020 |
| Willow Catering Services Limited | Manufacturing | 2003 |
| Wilma’S Rainford Ltd | Hospitality | 2025 |
| Wilson Investment Properties Ltd | Real estate | 2022 |
| Windle Podiatry & Chiropody Limited | Health & social care | 2018 |
| Windle Roofing Limited | Construction | 2011 |
| Windscreens 2U Ltd | Wholesale & retail | 2021 |
| Winestore Distribution Limited | Wholesale & retail | 2014 |
| Wing MAN (NW) Limited | Hospitality | 2023 |
| Wise Services Group Limited | Financial services | 2024 |
| With-You Consultancy Ltd | Education | 2018 |
| WJD Estates Limited | Administrative & support | 2017 |
| WJD Retail & Online Flooring Solutions Limited | Construction | 2020 |
| WJD Specialist Flooring Contractors Ltd | Construction | 2011 |
| WLB Limited | Professional & scientific | 2026 |
| WM Miller Consulting Ltd | Professional & scientific | 2022 |
| Wonder Neurodiversity CIC | Professional & scientific | 2025 |
| Woodholme Construction Services Limited | Construction | 2007 |
| Woodleigh Consultancy Ltd | Health & social care | 2021 |
| Woods Holding NW Ltd | Real estate | 2022 |
| Woods Inspection Services Limited | Administrative & support | 2016 |
| Woods Traders and Sons Limited | Administrative & support | 2025 |
| Woodys Electrical Ltd | Construction | 2025 |
| Woof & Meow Pet Spa Ltd | Other services | 2024 |
| World of Treasures Ltd | Wholesale & retail | 2024 |
| Worralls Commercials Ltd | Wholesale & retail | 2015 |
| Wright Marine Ltd | Professional & scientific | 2020 |
| Wrightdevelopment Group Limited | Real estate | 2019 |
| WRK Digital Ltd | Information & communication | 2022 |
| WS F One Limited | Extraterritorial | 2026 |
| Wyjd Retail Ltd | Wholesale & retail | 2025 |
| XCD Partners Ltd | Professional & scientific | 2024 |
| Xcel (UK) Limited | Manufacturing | 2012 |
| Xclusivityy Limited | Wholesale & retail | 2016 |
| XCO Render Ltd | Construction | 2023 |
| Xian Garden Ltd | Hospitality | 2019 |
| Xing Wang (NO 1) Ltd | Wholesale & retail | 2023 |
| XU Fast Food Ltd | Hospitality | 2025 |
| Yadah Global Limited | Information & communication | 2017 |
| Yammont Limited | Real estate | 1978 |
| Yang Y Limited | Hospitality | 2012 |
| Yellow Path Consultancy Ltd | Health & social care | 2025 |
| Yellow Path Consulting Ltd | Health & social care | 2025 |
| YES Care Services Ltd | Health & social care | 2013 |
| Yicker Vapes Ltd | Wholesale & retail | 2024 |
| YM Asset Management Ltd | Real estate | 2019 |
| Yonder Property Investments Ltd | Real estate | 2020 |
| York Road Healthcare Limited | Wholesale & retail | 2023 |
| Young Allies CIC | Information & communication | 2024 |
| Your Brand Ideas Ltd | Professional & scientific | 2021 |
| Yousif's Barber(St Helens) Ltd | Other services | 2020 |
| Youth Aesthetics & Skin Care by Paul Smith Limited | Health & social care | 2024 |
| Yuex Construction Ltd | Construction | 2024 |
| YZH Pharma Limited | Wholesale & retail | 2019 |
| ZA Smile Ltd | Health & social care | 2023 |
| Zaituns (Leeds) Limited | Administrative & support | 2010 |
| ZC Electrical Services Ltd | Energy | 2018 |
| Zestico Limited | Other services | 2015 |
| Zextons Limited | Information & communication | 2016 |
| Ziko Trans Ltd | Transport & logistics | 2019 |
| Zion Autocare Limited | Wholesale & retail | 2026 |
| Zlatkov SVK Ltd | Transport & logistics | 2019 |
| ZNA Barbers Ltd | Other services | 2025 |
| Zoetrope 101 Limited | Information & communication | 2007 |
| Zone 5 Ltd | Information & communication | 2017 |
| Zuvatu Limited | Professional & scientific | 2016 |
| Zyah Engineering Ltd | Professional & scientific | 2019 |
| Zzed Properties Ltd | Real estate | 2021 |