| Wyatt Plumbing & Heating Ltd | Construction | 2025 |
| WZ Packaging Limited | Manufacturing | 2013 |
| X - Press Linen Services Limited | Administrative & support | 2005 |
| X S Automation Limited | Professional & scientific | 1996 |
| Xarbot Ltd | Other services | 2018 |
| XBB Transport Ltd | Transport & logistics | 2024 |
| Xclusiv Care Limited | Administrative & support | 2023 |
| Xebar Ltd | Other services | 2019 |
| Xenia Services Ltd | Information & communication | 2025 |
| Xerez Ltd | Other services | 2019 |
| Xeria Limited | Information & communication | 2016 |
| Xernio Limited | Manufacturing | 2013 |
| Xespius Ltd | Other services | 2019 |
| XG Watches Ltd | Wholesale & retail | 2023 |
| Xo-Customs Ltd | Wholesale & retail | 2017 |
| XPO IT Services Limited | Information & communication | 1998 |
| XPO Trading Ltd | Water & waste | 2017 |
| Xpolar Clothing Ltd | Wholesale & retail | 2024 |
| Xscape NOW Limited | Arts & recreation | 2016 |
| XVW Investment Limited | Real estate | 2025 |
| Xyzee Design Consultants Ltd | Administrative & support | 2011 |
| Y C Yang Limited | Real estate | 2002 |
| Y J KOK Ltd | Education | 2019 |
| Y&Gs Food Group Ltd | Hospitality | 2025 |
| Y-Our Network Group Ltd | Wholesale & retail | 2022 |
| Yakus Property & Cleaning Services Ltd | Real estate | 2025 |
| Yaner Ltd | Other services | 2020 |
| Yap-Og Ltd | Real estate | 2026 |
| Yatyuet Limited | Real estate | 2024 |
| YAW Construction Services Limited | Professional & scientific | 2014 |
| Yellow Dog Inc Ltd | Wholesale & retail | 2019 |
| Yellow HAT Security Solutions Limited | Administrative & support | 2014 |
| Yellow Marshmallow Group Ltd | Information & communication | 2017 |
| Yellow Ribbon Community Chaplaincy | Other services | 2015 |
| Yellowstone Holdings Limited | Financial services | 2022 |
| Yeoley Limited | Information & communication | 2021 |
| Yevhen Michell Group Ltd | Manufacturing | 2024 |
| Yg&Mm Limited | Health & social care | 2022 |
| Ylemcey Limited | Wholesale & retail | 2026 |
| Ymca Wellington and District | Health & social care | 2016 |
| YOU Deserve a Medal Limited | Wholesale & retail | 2022 |
| Young Supplies Limited | Wholesale & retail | 2024 |
| Youngstars Multi-Sports Ltd | Education | 2025 |
| Your Apple FIX Ltd | Wholesale & retail | 2025 |
| Your Bathroom Showroom Ltd | Wholesale & retail | 2021 |
| Your Business Carriage Ltd | Transport & logistics | 2021 |
| Your Choice Financial Services Limited | Financial services | 2015 |
| Your Home (UK) Limited | Real estate | 2013 |
| Your Mobile Limited | Extraterritorial | 2018 |
| Your Stay Shrewsbury Ltd | Real estate | 2025 |
| Your Stay Shropshire Ltd | Real estate | 2025 |
| Your Stay Telford Ltd | Real estate | 2025 |
| Yourcargocentro Ltd | Transport & logistics | 2024 |
| Yunova Talent Ltd | Administrative & support | 2026 |
| Yurt Maker Ltd | Administrative & support | 2014 |
| Yutak Ltd | Professional & scientific | 2026 |
| Yutopia Spa Ltd | Extraterritorial | 2015 |
| Yvonne Simons Consultancy Ltd | Extraterritorial | 2025 |
| YYW Limited | Hospitality | 2025 |
| Z PROPERTIES4U Ltd | Real estate | 2026 |
| Zabub Ltd | Real estate | 2021 |
| Zadatim Ltd | Other services | 2019 |
| Zaevei Care Limited | Hospitality | 2025 |
| Zana Pets Ltd | Wholesale & retail | 2024 |
| Zane BBQ & Grill Ltd | Hospitality | 2023 |
| Zarbot Ltd | Other services | 2019 |
| Zawz Ltd | Real estate | 2019 |
| Zeck Broseley Ltd | Administrative & support | 2022 |
| ZEE Halal Meat Limited | Wholesale & retail | 2024 |
| Zeezara Limited | Construction | 2014 |
| Zenith Hygiene Food and Beverage Limited | Professional & scientific | 2004 |
| Zenith Hygiene Group Limited | Manufacturing | 2008 |
| Zenith Hygiene Systems Limited | Manufacturing | 1996 |
| Zenith International Trading Ltd | Wholesale & retail | 1999 |
| Zenna Restaurant Limited | Hospitality | 2018 |
| Zenterprize Limited | Information & communication | 2023 |
| Zero Waste Medals Ltd | Manufacturing | 2023 |
| ZFM Group Ltd | Wholesale & retail | 2025 |
| Zhub Limited | Construction | 2024 |
| Zillacon Holdings Limited | Financial services | 2020 |
| Zimbru Ltd | Other services | 2020 |
| Zimcancapital Ltd | Information & communication | 2025 |
| Zino Properties Limited | Real estate | 2022 |
| Zion Foods Limited | Wholesale & retail | 2025 |
| Zizady Limited | Wholesale & retail | 2019 |
| Zizady Properties Limited | Real estate | 2019 |
| ZJL Limited | Hospitality | 2025 |
| ZK Branding Ltd | Wholesale & retail | 2026 |
| Znamtik Ltd | Other services | 2019 |
| ZOB Services Ltd | Other services | 2018 |
| Zoe's Hair and Beauty Limited | Other services | 2016 |
| Zoetrends Limited | Wholesale & retail | 2020 |
| Zoko Limited | Transport & logistics | 2018 |
| Zonerak Limited | Information & communication | 1988 |
| Zooblu Ltd | Other services | 2019 |
| Zoodel Ltd | Other services | 2019 |
| Zoom Online Ltd | Information & communication | 2009 |
| Zoonam Ltd | Other services | 2019 |
| Zoosto Ltd | Other services | 2019 |
| Zovda Ltd | Wholesale & retail | 2019 |