| Wypnatech Ltd | Manufacturing | 2026 |
| Wyvernsmasher Ltd | Wholesale & retail | 2025 |
| WYW Ltd | Wholesale & retail | 2022 |
| WZE Limited | Construction | 2025 |
| Włoskie Inwestycje Ltd | Real estate | 2025 |
| X & F Properties Ltd | Real estate | 2019 |
| X - Family Limited | Wholesale & retail | 2004 |
| X Borders Consultants Ltd | Professional & scientific | 2022 |
| X Security Ltd | Administrative & support | 2024 |
| X-Ess Limited | Wholesale & retail | 2021 |
| X-Ray Films Limited | Information & communication | 1956 |
| X.Q Electrical Limited | Construction | 2024 |
| Xanadu Designs Limited | Information & communication | 2020 |
| Xanda Consultancy Limited | Information & communication | 2023 |
| Xandric Ventures Ltd | Extraterritorial | 2026 |
| Xandrielle Creative Ltd | Extraterritorial | 2026 |
| Xanthan Ltd | Real estate | 2020 |
| Xcel Hospitality Ltd | Hospitality | 2024 |
| Xcel Hospitality Retford Ltd | Hospitality | 2024 |
| Xcite Sports & Fitness Limited | Education | 2014 |
| Xdestro Ltd | Transport & logistics | 2025 |
| Xenith Clinic Limited | Wholesale & retail | 2024 |
| Xenofontos & Sons Limited | Hospitality | 2017 |
| Xenofontos & Sons Property Limited | Real estate | 2020 |
| Xenon BTM Associates Limited | Professional & scientific | 2002 |
| Xenon Park Limited | Construction | 2021 |
| XGO Transport Limited | Transport & logistics | 2025 |
| Xiong Neoglory Ltd | Wholesale & retail | 2015 |
| XIX Project Management Limited | Professional & scientific | 2015 |
| Xixoio Ltd | Administrative & support | 2017 |
| Xixona Professional Services Ltd | Transport & logistics | 2025 |
| Xorba Services Limited | Other services | 2018 |
| XP School Trust Limited | Education | 2013 |
| XPI Cases Limited | Manufacturing | 2014 |
| Xpo-Online Ltd | Information & communication | 2014 |
| XPX Ltd | Transport & logistics | 2024 |
| Xquisite Cleaning Ltd | Administrative & support | 2026 |
| Xquisite Electrical Ltd | Manufacturing | 2016 |
| XRE Construction Training Limited | Education | 2014 |
| Xtra Electrical Ltd | Construction | 2016 |
| Xtra Hands Limited | Other services | 2012 |
| XU8UK Limited | Health & social care | 2016 |
| Xvoxy Home Limited | Wholesale & retail | 2025 |
| XY Médica Aesthetics Ltd | Extraterritorial | 2024 |
| XYC Transport Ltd | Transport & logistics | 2024 |
| Y C Leisure Limited | Professional & scientific | 2003 |
| Y Education Limited | Transport & logistics | 2019 |
| Y J Renewable Energy Technology Company Limited | Financial services | 2025 |
| Y&H Digital Solutions Ltd | Information & communication | 2020 |
| Y3K Enterprises Ltd | Extraterritorial | 2005 |
| Yacht & House Ltd | Information & communication | 2025 |
| Yacht Race Club Ltd | Extraterritorial | 2026 |
| Yakars Brother Ltd | Hospitality | 2024 |
| Yamal Ltd | Information & communication | 2025 |
| Yameen Online Ltd | Education | 2026 |
| Yanar Ltd | Other services | 2025 |
| Yang City Ltd | Hospitality | 2026 |
| Yannis Delivery Ltd | Transport & logistics | 2019 |
| Yapici Fix-It Ltd | Construction | 2020 |
| Yarrow & Co. Limited | Extraterritorial | 2026 |
| Yary Services Ltd | Transport & logistics | 2022 |
| YAS Plant Limited | Administrative & support | 2025 |
| Yasmin Design Limited | Professional & scientific | 2018 |
| Yasmina Logistics Ltd | Transport & logistics | 2023 |
| Yates's Jetting Limited | Administrative & support | 2011 |
| YAW Limited | Financial services | 2007 |
| YAY Food Ltd | Hospitality | 2024 |
| YAYA21 Ltd | Wholesale & retail | 2016 |
| YC Holdings Limited | Professional & scientific | 2016 |
| YEL Bistro Ltd | Hospitality | 2025 |
| YEL Pizza Ltd | Hospitality | 2026 |
| Yellow Moor Limited | Administrative & support | 2016 |
| Yieldmark Properties Ltd | Real estate | 2026 |
| Yilas Global Trade Ltd | Wholesale & retail | 2021 |
| Yildiz Fish Ltd | Hospitality | 2024 |
| Yildiz INT Limited | Other services | 2024 |
| Yilmaz Patisserie Ltd | Wholesale & retail | 2026 |
| Yinq Ltd | Health & social care | 2026 |
| YIU Properties Ltd | Real estate | 2023 |
| YM & AY Co Ltd | Wholesale & retail | 2019 |
| Ymca Doncaster Ltd | Hospitality | 2025 |
| YNK Express Haulage Co Limited | Transport & logistics | 2025 |
| YNK Express Ltd | Transport & logistics | 2021 |
| YO8 Pizza Limited | Hospitality | 2024 |
| Yoga Insurance Services Limited | Financial services | 2015 |
| Yogel Limited | Wholesale & retail | 2024 |
| Yogesh Rajendran Ltd | Construction | 2026 |
| Yoldas Mini Market Limited | Wholesale & retail | 2025 |
| Yona Bidco Limited | Financial services | 2023 |
| Yona Midco Limited | Financial services | 2023 |
| Yona Topco Limited | Financial services | 2023 |
| Yordon Limited | Wholesale & retail | 2003 |
| York Road Transport Limited | Transport & logistics | 2025 |
| Yorkshire Adoption Agency | Health & social care | 1982 |
| Yorkshire Aero Club Limited | Arts & recreation | 2017 |
| Yorkshire Aggregates Limited | Water & waste | 2010 |
| Yorkshire Bike Shack Community Interest Company | Wholesale & retail | 2021 |
| Yorkshire Blasting & Paint Services Ltd | Manufacturing | 2022 |
| Yorkshire Cable Drums and Wood Packaging Limited | Manufacturing | 2000 |
| Yorkshire Caravans & Motorhomes Limited | Wholesale & retail | 1961 |