| Yip&Co Ltd. | Real estate | 2024 |
| YKS Contractors Limited | Construction | 2014 |
| YNY Investment Limited | Real estate | 2024 |
| Yogan Super Properties Limited | Real estate | 2017 |
| Yorkmoor Property Management (Borough Green) Ltd | Households | 2009 |
| Yorkmoor Property Management (Halling) Limited | Administrative & support | 2011 |
| Yorkmoor Property Management Limited | Households | 2003 |
| Yosh Property Services Limited | Administrative & support | 2014 |
| Yosha Interior Hub Ltd | Wholesale & retail | 2025 |
| Yosha Tech Ltd | Professional & scientific | 2025 |
| YOU and ME Publishing Ltd | Information & communication | 2022 |
| YOU Auto Limited | Wholesale & retail | 2024 |
| Youfulfilled Ltd | Health & social care | 2023 |
| Young Learners Academy Ltd | Education | 2023 |
| Young Oceans Limited | Wholesale & retail | 2018 |
| Young People in Bridging Ltd | Administrative & support | 2025 |
| Young Residential Lettings Limited | Real estate | 2024 |
| Youngs and Youngs Limited | Wholesale & retail | 2025 |
| Your Corporate Governance Ltd | Professional & scientific | 2020 |
| Your Health IS Wealth Ltd | Health & social care | 2024 |
| Your Price Bi-Folds Limited | Real estate | 2014 |
| Your Stairs Baldock Ltd | Manufacturing | 2020 |
| Your Therapy Lounge Ltd | Health & social care | 2024 |
| Your View Limited | Information & communication | 2006 |
| Your Visit Limited | Administrative & support | 2021 |
| Yousif Medico Limited | Health & social care | 2009 |
| Youth Stars UK Ltd | Education | 2026 |
| Youths OFF the Boat Ltd | Manufacturing | 2023 |
| YP Services Ltd | Professional & scientific | 2017 |
| YPE Spitfire Limited | Construction | 2016 |
| YPJ Ltd | Construction | 2019 |
| YSL Consulting Ltd | Professional & scientific | 2023 |
| Yu&Co Services Ltd | Construction | 2021 |
| Yuan Plus Limited | Real estate | 2018 |
| Yuchen (UK) Ltd | Professional & scientific | 2010 |
| Yukal Limited | Professional & scientific | 2011 |
| Yummy Chicken and Pizza Ltd | Hospitality | 2021 |
| YUR Group Ltd | Construction | 2025 |
| YY Holdings Ltd | Real estate | 2025 |
| Z & Z Medical Ltd | Health & social care | 2011 |
| Z & Z Properties Investment Ltd | Real estate | 2016 |
| Z&A Multi Services Ltd | Health & social care | 2020 |
| Z2O Technologies Limited | Agriculture & fishing | 2012 |
| Zaar Property Surrey Ltd | Real estate | 2026 |
| Zabii Shopsphere Ltd | Wholesale & retail | 2023 |
| ZAC Properties Limited | Real estate | 2012 |
| Zain & Co UK Ltd | Real estate | 2024 |
| Zalmora Ltd | Professional & scientific | 2025 |
| Zalore Ltd | Arts & recreation | 2025 |
| Zamazins Ltd | Wholesale & retail | 2026 |
| Zamine Ltd | Real estate | 2018 |
| Zams Gynaecology Ltd | Health & social care | 2025 |
| Zaprynov Limited | Construction | 2007 |
| Zara & Marjan Co Ltd | Health & social care | 2018 |
| Zara Private Ltd | Hospitality | 2018 |
| Zark Solutions Limited | Information & communication | 2024 |
| Zass G Apartments Ltd | Hospitality | 2022 |
| Zataro Management Limited | Professional & scientific | 2024 |
| Zawadi Naturals Ltd | Manufacturing | 2020 |
| Zayran Group Ltd | Wholesale & retail | 2026 |
| ZB Deliveries Ltd | Transport & logistics | 2026 |
| Zbam Studio Ltd | Information & communication | 2015 |
| Zcore Solutions Limited | Information & communication | 2022 |
| Zebb Ltd | Wholesale & retail | 2003 |
| ZED Business Solutions Limited | Real estate | 2014 |
| ZED Rental Solutions Ltd | Real estate | 2019 |
| ZEE Space Ltd | Administrative & support | 2023 |
| Zeltri Ltd | Information & communication | 2025 |
| Zema Limited | Financial services | 2024 |
| Zenko Studio Ltd | Information & communication | 2021 |
| Zenler Ltd | Information & communication | 2014 |
| Zentragoods Ltd | Wholesale & retail | 2025 |
| Zenzara Limited | Information & communication | 2026 |
| Zenzero Design Limited | Professional & scientific | 2013 |
| Zephram Ltd | Professional & scientific | 2025 |
| Zetta Capital Holdings Limited | Professional & scientific | 2021 |
| Zetta Capital International Limited | Professional & scientific | 2021 |
| Zetta Capital Limited | Financial services | 2021 |
| Zeygo Limited | Transport & logistics | 2020 |
| ZF Merchants Ltd | Wholesale & retail | 2026 |
| Zhakan Studio Ltd | Professional & scientific | 2025 |
| Zhardan Legal Consultancy Limited | Professional & scientific | 2015 |
| Zielogics Solutions Limited | Information & communication | 2014 |
| Zilingo Property Development Ltd | Real estate | 2021 |
| Zipzap Solutions Ltd | Information & communication | 2016 |
| Ziyou Travel & Training Services Ltd | Manufacturing | 2016 |
| ZJM Services Ltd | Construction | 2016 |
| ZLB UK Couriers Ltd | Transport & logistics | 2022 |
| ZM Smart UK Limited | Other services | 2018 |
| ZMC AF Digital Limited | Information & communication | 2025 |
| ZOE LAN Ltd | Manufacturing | 2012 |
| ZOE Shop Limited | Wholesale & retail | 2026 |
| Zomac Consultants Limited | Mining & quarrying | 2014 |
| Zorak Ltd | Construction | 2015 |
| ZSA ZSA Films Ltd | Information & communication | 2025 |
| Zulal Water Technology (UK) Ltd | Water & waste | 2013 |
| Zvikomborero PVT Ltd | Health & social care | 2012 |
| ZZZ Cons Ltd | Construction | 2025 |