| Wisei Accountants Global Ltd. | Professional & scientific | 2013 |
| Wiser Productions Limited | Arts & recreation | 2003 |
| Wisesyndicate Ltd | Wholesale & retail | 2022 |
| With Devi Ltd | Wholesale & retail | 2024 |
| WJD Consulting Ltd | Professional & scientific | 2022 |
| WK Contractors Limited | Construction | 2018 |
| Wkshp Limited | Professional & scientific | 2026 |
| WL Assets Holdings Ltd | Extraterritorial | 2016 |
| WLP Properties Bussiness Ltd | Real estate | 2021 |
| WMK Contractors UK Ltd | Construction | 2025 |
| WNA Trading Ltd | Transport & logistics | 2016 |
| WNK Builders Ltd | Construction | 2018 |
| Wocior Group Ltd | Financial services | 2025 |
| WOK House Ltd | Hospitality | 2022 |
| Woking Tops Pizza Ltd | Hospitality | 2022 |
| Wolf Street Middle East Trading and Consultancy Ltd | Financial services | 2025 |
| Wolfhenix Ltd | Wholesale & retail | 2024 |
| Woodglen Management Limited | Households | 2020 |
| Woodsy Design and Builders Limited | Transport & logistics | 2019 |
| Woolgar Furnishings Limited | Wholesale & retail | 2013 |
| Woolly Limited | Real estate | 2022 |
| Worbax International Co Ltd | Wholesale & retail | 2025 |
| Working Improvements Ltd | Professional & scientific | 2020 |
| Workmaite Ltd | Administrative & support | 2025 |
| World Anvil Ltd | Information & communication | 2018 |
| World Science Journalism Conference 2027 Limited | Administrative & support | 2025 |
| WOW Eventful Ltd | Hospitality | 2024 |
| Wowji Ltd | Information & communication | 2023 |
| WR Weedon Limited | Professional & scientific | 2010 |
| Wrens and Willows Ltd | Information & communication | 2013 |
| WSI Trading Ltd | Transport & logistics | 2017 |
| Wybren Limited | Information & communication | 2017 |
| Wymondham Medical Services Ltd | Wholesale & retail | 2025 |
| Wypebot Ltd | Wholesale & retail | 2025 |
| WZM Holds Ltd | Financial services | 2024 |
| WZM Property Investment Ltd | Real estate | 2024 |
| WZM Trading Ltd | Health & social care | 2024 |
| X Blade Motor Bikes Limited | Wholesale & retail | 2011 |
| Xeesaga Holding Ltd | Real estate | 2020 |
| Xengland Limited | Manufacturing | 2024 |
| Xpertev Limited | Construction | 2019 |
| Xpress Care Limited | Professional & scientific | 2006 |
| Xpress Kebab & Pizza Limited | Hospitality | 2023 |
| XSB Consultants Limited | Information & communication | 2018 |
| YACHT4CHARTER Limited | Other services | 2013 |
| YAF Investments Limited | Real estate | 2021 |
| Yahvi Homes Ltd | Real estate | 2022 |
| Yaki Sarsa Ltd | Hospitality | 2025 |
| Yard Share Ltd | Water & waste | 2019 |
| Yaron Morhaim Jewellery Design Limited | Wholesale & retail | 2006 |
| YAS Cosmetics UK Limited | Wholesale & retail | 2025 |
| YAS Trading Limited | Transport & logistics | 2020 |
| YAW Admin Support Ltd | Administrative & support | 2026 |
| YAW Cleaning London Ltd | Administrative & support | 2026 |
| YAW Cleaning UK Ltd | Administrative & support | 2026 |
| YAW E1 Ltd | Professional & scientific | 2026 |
| YAW Property Maintenance Ltd | Professional & scientific | 2026 |
| YAW Trading Ltd | Administrative & support | 2024 |
| YES Online Properties Ltd | Wholesale & retail | 2025 |
| Ykar Limited | Transport & logistics | 2018 |
| YMT Property Services Ltd | Real estate | 2021 |
| YMT Services Ltd | Transport & logistics | 2019 |
| Yngpro Limited | Manufacturing | 2025 |
| Yomayo Ltd | Professional & scientific | 2014 |
| Yottalabs Ltd. | Information & communication | 2014 |
| YOU Save Solutions Limited | Hospitality | 2020 |
| You&I Limited Limited | Professional & scientific | 2023 |
| Younas Enterprises Ltd | Administrative & support | 2020 |
| Youngs Property Maintenance Ltd | Construction | 2024 |
| Your Brainiac Ltd | Information & communication | 2023 |
| Yours Consultancy Ltd | Professional & scientific | 2021 |
| Yours Consultants Limited | Professional & scientific | 2013 |
| Yours Consultents Ltd | Professional & scientific | 2018 |
| Yours International Ltd | Information & communication | 2020 |
| YQK Trading Limited | Transport & logistics | 2025 |
| YS London Limited | Other services | 2019 |
| YT Tran & Co Ltd Limited | Administrative & support | 2015 |
| Ytech Security Ltd | Administrative & support | 2026 |
| Yuco Ltd | Construction | 2019 |
| Yume Creative Ltd | Professional & scientific | 2009 |
| Yurta Group Ltd | Manufacturing | 2025 |
| Yvette Beattie Ltd | Professional & scientific | 2013 |
| YXY Wang Limited | Hospitality | 2018 |
| Z 4 Investments Limited | Real estate | 2003 |
| Z Healthcare Limited | Health & social care | 2022 |
| Z I Investments Ltd | Construction | 2019 |
| Z&Z Driving School Ltd | Education | 2023 |
| Z&Z Traders Ltd | Professional & scientific | 2021 |
| Z4 HAS Limited | Real estate | 2007 |
| ZA Investco Services Ltd | Real estate | 2025 |
| ZA London Limited | Transport & logistics | 2021 |
| ZAD Trading Ltd | Transport & logistics | 2017 |
| ZAH Trading Ltd | Transport & logistics | 2017 |
| Zahan Traders Ltd | Hospitality | 2022 |
| Zahk Limited | Health & social care | 2024 |
| Zahran Limited | Health & social care | 2013 |
| Zain Asif Limited | Other services | 2024 |
| Zain Medicos Limited | Health & social care | 2014 |
| Zain Traders Ltd | Wholesale & retail | 2018 |
| Zaki and Saif Limited | Health & social care | 2014 |