| Worththerapy Limited | Health & social care | 2021 |
| Worx Fitness Limited | Arts & recreation | 2015 |
| Wowjar Ltd | Wholesale & retail | 2019 |
| WP Associates Limited | Administrative & support | 2007 |
| WP Cooling Solutions Limited | Manufacturing | 2016 |
| WP Transport Solutions Ltd | Transport & logistics | 2025 |
| WPL (UK) Architectural Limited | Construction | 2012 |
| WPL (UK) Limited | Construction | 2002 |
| WR Project Builders Ltd | Other services | 2025 |
| Wraith Consultancy Ltd | Professional & scientific | 2018 |
| Wraithcross Limited | Administrative & support | 2019 |
| Wregular Ltd | Real estate | 2021 |
| Wrenbury Court (Bolton) Management Company Limited | Real estate | 1984 |
| Wrenchride Limited | Wholesale & retail | 2021 |
| WRG Roofing Ltd | Construction | 2021 |
| Wright & Co Consulting Limited | Information & communication | 2025 |
| Wright 1ST Time Ltd | Wholesale & retail | 2007 |
| Wright Partnership (Saddleworth) Limited | Financial services | 2017 |
| Wright Property NW Ltd | Real estate | 2018 |
| Wright Rail Limited | Construction | 2017 |
| Write Winning Bids Ltd | Professional & scientific | 2025 |
| Writers' ROW (Hale) Management Company Limited | Households | 2023 |
| WRK Investments Limited | Real estate | 2021 |
| Wrkhrd Clothing Ltd | Wholesale & retail | 2025 |
| Wrps Group Holding Limited | Financial services | 2024 |
| Wrps Group Limited | Construction | 2007 |
| WS Dent Limited | Health & social care | 2024 |
| WSH Software Solutions Ltd | Information & communication | 2026 |
| WSK Wholesale Ltd | Wholesale & retail | 2022 |
| WTA Flavours Ltd | Hospitality | 2025 |
| Wudustore Limited | Manufacturing | 2016 |
| Wulfwagen Ltd | Manufacturing | 2025 |
| Wumby Enterprises Ltd | Wholesale & retail | 2020 |
| Wupendram Limited | Information & communication | 2013 |
| Wvsh.Ai Limited | Professional & scientific | 2025 |
| Wxdis Limited | Information & communication | 2019 |
| WY Estates Limited | Real estate | 2014 |
| Wyatt Direction and Motion Limited | Professional & scientific | 2016 |
| Wyatt Investment Management Limited | Real estate | 2026 |
| WYE Knot Limited | Administrative & support | 1994 |
| Wylde Media Limited | Information & communication | 2018 |
| Wynfern Limited | Real estate | 2023 |
| Wyre Broadcast Solutions Ltd | Administrative & support | 2016 |
| Wyresdale Properties Limited | Real estate | 2023 |
| Wythenshawe Tearooms Limited | Hospitality | 2023 |
| WZ FIX Ltd | Construction | 2017 |
| X Wire Networks Limited | Information & communication | 2009 |
| X10AI Ltd | Professional & scientific | 2026 |
| X3 Motors Ltd | Wholesale & retail | 2026 |
| X3 Youth Community Interest Company | Education | 2026 |
| Xanadu Networks Limited | Wholesale & retail | 2012 |
| XCA Group Limited | Transport & logistics | 2025 |
| Xceed Property Solutions Limited | Real estate | 2023 |
| Xceed Ventures Ltd | Transport & logistics | 2021 |
| Xcell Healthcare Solutions Ltd | Health & social care | 2022 |
| Xcentricdesign Ltd | Information & communication | 2020 |
| XD Origami Ltd | Information & communication | 2016 |
| Xeemat Logistics Ltd | Transport & logistics | 2025 |
| Xiagra Ltd | Wholesale & retail | 2020 |
| Xing YE Limited | Hospitality | 2023 |
| Xiong Xiong Limited | Health & social care | 2026 |
| Xlnt (UK) Limited | Wholesale & retail | 2007 |
| XMLI5 Limited | Information & communication | 2005 |
| XN1 Limited | Information & communication | 2021 |
| Xorabits Consulting Limited | Information & communication | 2019 |
| XP Influence Limited | Other services | 2023 |
| XP Transport Ltd | Transport & logistics | 2026 |
| Xpert Autorentals Ltd | Administrative & support | 2015 |
| Xpert Care UK Limited | Administrative & support | 2022 |
| Xpert Packaging Ltd | Wholesale & retail | 2021 |
| Xpert Solutions Group Ltd | Information & communication | 2024 |
| XPO Gadgets Ltd | Wholesale & retail | 2017 |
| Xpress Foods Chilled Ltd | Manufacturing | 2025 |
| Xpress Foods Frozen Ltd | Manufacturing | 2025 |
| Xpress Frozen Food Ltd | Manufacturing | 2018 |
| Xpress Urself CIC | Information & communication | 2016 |
| Xpressconnect Ltd | Wholesale & retail | 2021 |
| Xrayetc Limited | Other services | 2024 |
| Xscale Limited | Transport & logistics | 2020 |
| Xsta Group Ltd | Information & communication | 2023 |
| Xterior & Interior Ltd | Wholesale & retail | 2018 |
| XTN Infrastructure Ltd | Information & communication | 2026 |
| Xtreme Intelligence Limited | Wholesale & retail | 2022 |
| Xtremex Sports Ltd | Wholesale & retail | 2019 |
| XV Tech Ltd | Information & communication | 2023 |
| Xyrel Limited | Wholesale & retail | 2025 |
| XYZ Investment Holding Ltd | Financial services | 2016 |
| XYZ Survey Limited | Professional & scientific | 2020 |
| Xznex Limited | Information & communication | 2025 |
| Y & M Wholesale Ltd | Wholesale & retail | 2011 |
| Y B Optical Limited | Health & social care | 2017 |
| Y Fort Ltd | Education | 2024 |
| Y Fozdar Ltd | Health & social care | 2025 |
| Y P Autos NW Ltd | Wholesale & retail | 2021 |
| Y P Business Holdings Ltd | Financial services | 2024 |
| Y P Estates Ltd | Real estate | 2024 |
| Y Suleman Ltd | Financial services | 2020 |
| Y Suleman Properties Ltd | Real estate | 2023 |
| Y T S Transport Ltd | Transport & logistics | 2026 |
| Y&F Pharma Ltd | Professional & scientific | 2021 |