| Yaseem Management Ltd | Real estate | 2026 |
| Yasinhafizmuhammad Limited | Wholesale & retail | 2025 |
| Yawrate Ltd | Information & communication | 2026 |
| Yazlay Properties Ltd | Construction | 2019 |
| YB Innovations Ltd | Information & communication | 2025 |
| YBS Records Ltd | Information & communication | 2024 |
| YCH Data Solutions Limited | Information & communication | 2017 |
| YD Advisory Limited | Professional & scientific | 2026 |
| YD Property Holdings Ltd | Real estate | 2025 |
| Yellow Brick Road Investments Ltd | Construction | 2023 |
| Yellow Couriers Ltd | Transport & logistics | 2013 |
| Yellow Dragon Education Limited | Education | 2018 |
| Yellow NOW Ltd | Professional & scientific | 2020 |
| Yellowdots DEV Limited | Information & communication | 2022 |
| Yellowfish Developments Ltd | Administrative & support | 1994 |
| Yesha Ltd | Health & social care | 2025 |
| Yimnos Limited | Real estate | 2020 |
| YIP YAP Design Limited | Information & communication | 1998 |
| Ykok Ltd | Real estate | 2020 |
| YNG Global Commerce Limited | Wholesale & retail | 2025 |
| YNO Engineering Ltd | Manufacturing | 2024 |
| Yoga Health Mandala Limited | Other services | 2014 |
| Yogis Yoga Ltd | Arts & recreation | 2018 |
| Yolanda's Beauty Room Ltd | Other services | 2019 |
| Yoloria Teching Limited | Information & communication | 2025 |
| Yorkshire Print and Packaging Solutions Limited | Manufacturing | 2011 |
| YOT London Limited | Financial services | 2020 |
| YOU ARE the Media Limited | Professional & scientific | 2008 |
| Young at Heart Travel Ltd | Administrative & support | 2019 |
| Young People Prepared Limited | Administrative & support | 2015 |
| Young Property Development Ltd | Construction | 1987 |
| Younkler Designs Ltd | Manufacturing | 2025 |
| Your Cornerstone Ltd | Real estate | 2019 |
| Your Daily Store Online Limited | Wholesale & retail | 2021 |
| Your Drainage Solutions Limited | Water & waste | 2020 |
| Your Dual Citizenship Limited | Information & communication | 2025 |
| Your Future Impact Ltd | Education | 2026 |
| Your Group South Limited | Administrative & support | 2022 |
| Your Mortgage Master Ltd | Financial services | 2019 |
| Your Move Properties Limited | Real estate | 1999 |
| Your Pharma Clinics Ltd | Wholesale & retail | 2022 |
| Your Property Plans Limited | Professional & scientific | 2020 |
| Your Secure Security Ltd | Administrative & support | 2021 |
| Your Sparkling Services Ltd | Administrative & support | 2024 |
| Your Team Developments Limited | Administrative & support | 2011 |
| Your Team Properties Limited | Real estate | 2017 |
| Youreko Limited | Information & communication | 2010 |
| Yourscope Consulting Limited | Information & communication | 2014 |
| Youth Music Wessex CIC | Arts & recreation | 2021 |
| YRD1 Group Fitness Limited | Arts & recreation | 2021 |
| YSV7 London UK Limited | Wholesale & retail | 2024 |
| YT Baglung Ltd | Hospitality | 2023 |
| Yugen Limited | Professional & scientific | 2017 |
| Yugi Group Limited | Professional & scientific | 2025 |
| Yumak Group Ltd | Wholesale & retail | 2025 |
| Yunex Limited | Manufacturing | 2021 |
| Yuska Design Ltd | Wholesale & retail | 2019 |
| Yusuf 1999 Ltd | Hospitality | 2021 |
| Yusuf Group Ltd | Financial services | 2025 |
| Yves Limited | Wholesale & retail | 2023 |
| YY Online Services Ltd | Information & communication | 2012 |
| YZ Funny Limited | Wholesale & retail | 2025 |
| Z 220 Ltd | Wholesale & retail | 2025 |
| Z Marketing Limited | Wholesale & retail | 2002 |
| Z. Invest Ltd | Administrative & support | 2016 |
| Zaabz ICC CW Ltd | Wholesale & retail | 2026 |
| Zaaqi Limited | Wholesale & retail | 2025 |
| Zacely Limited | Wholesale & retail | 2010 |
| Zackecom Market Ltd | Wholesale & retail | 2025 |
| Zacs Couriers Ltd | Transport & logistics | 2019 |
| Zaid Shah Ltd | Wholesale & retail | 2024 |
| Zak's Chicken Limited | Hospitality | 2019 |
| Zalmaty Ltd | Other services | 2025 |
| Zamandzi Limited | Administrative & support | 2025 |
| Zambezi Group Ltd | Information & communication | 2021 |
| Zambia Orphans AID UK | Health & social care | 2011 |
| Zance Ltd | Information & communication | 2024 |
| Zanywa Companies Ltd | Wholesale & retail | 2024 |
| Zanzibar Quest Limited | Administrative & support | 2024 |
| Zarikler Limited | Wholesale & retail | 2024 |
| Zartuga Ltd | Wholesale & retail | 2025 |
| Zavara Limited | Wholesale & retail | 2025 |
| ZAY Tech Ltd | Wholesale & retail | 2025 |
| Zbra Limited | Professional & scientific | 2022 |
| Zeal South Ltd | Administrative & support | 2022 |
| Zecrum Ltd | Wholesale & retail | 2021 |
| Zeijei Ltd | Wholesale & retail | 2020 |
| ZEL Capital Limited | Information & communication | 2016 |
| Zelda Cheng Ltd | Health & social care | 2020 |
| Zelli Wellness Ltd | Manufacturing | 2025 |
| ZEN & Flame Candle Co Ltd | Manufacturing | 2025 |
| ZEN Logic Ltd | Professional & scientific | 2013 |
| ZEN Word Ltd | Wholesale & retail | 2025 |
| Zena Hair & Beauty Lounge Ltd | Wholesale & retail | 2025 |
| Zencode Consultancy Ltd | Information & communication | 2024 |
| Zenelec Ltd | Manufacturing | 2021 |
| Zenith Corporate Solutions Ltd | Administrative & support | 2016 |
| Zenith Global AI Ltd | Information & communication | 2025 |
| Zenith Residential Care Ltd | Health & social care | 2026 |
| Zenith Tanci Limited | Professional & scientific | 2025 |