| Xyonite Ltd | Information & communication | 2025 |
| Xypriz Ltd | Professional & scientific | 2025 |
| Y Thomas Property Ltd | Real estate | 2023 |
| Y&N Health Limited | Health & social care | 2021 |
| Ya-Mughni Ltd | Hospitality | 2024 |
| Yadeno Limited | Real estate | 2026 |
| Yalla Beirut Express Limited | Hospitality | 2017 |
| Yalla Beirut Tower Hill Limited | Hospitality | 2019 |
| Yalla Beirut Treaty Centre Limited | Hospitality | 2019 |
| Yalla Cruise Ltd | Administrative & support | 2024 |
| Yamuna Electricals Ltd | Wholesale & retail | 2026 |
| YAS 1 Services Ltd | Transport & logistics | 2024 |
| Yash Consultants Private Limited | Wholesale & retail | 2007 |
| Yash Home Improvements Ltd | Construction | 2021 |
| Yash KF Ltd | Wholesale & retail | 2023 |
| Yash,S Store Limited | Wholesale & retail | 2025 |
| Yashicom Ltd | Information & communication | 2020 |
| Yashnoor UK Ltd | Wholesale & retail | 2022 |
| Yashraj Singh Limited | Real estate | 2022 |
| Yashvith Limited | Professional & scientific | 2024 |
| Yasoob Traders Ltd | Wholesale & retail | 2025 |
| Yazay Ltd | Real estate | 2025 |
| YCS Group Ltd | Information & communication | 2016 |
| YD Merchandise Trading Co Ltd | Wholesale & retail | 2018 |
| YDP Group Ltd | Administrative & support | 2026 |
| Yeading Convenience Store Ltd | Wholesale & retail | 2023 |
| Yellow Agro Group UK Ltd | Wholesale & retail | 2025 |
| Yellow Line Driving School Limited | Education | 2023 |
| Yellow Parrot Property Ltd | Real estate | 2023 |
| Yellowmadhouse Ltd | Arts & recreation | 2020 |
| YES Way Jose Ltd | Professional & scientific | 2022 |
| Yesildag Catering Ltd | Hospitality | 2018 |
| Ygrec Fixing Ltd | Construction | 2025 |
| Yiewsley Plumbing Centre Limited | Wholesale & retail | 2015 |
| Yinsung Ltd | Hospitality | 2011 |
| Ylanaj Limited | Health & social care | 2019 |
| YNR Trading Ltd | Wholesale & retail | 2026 |
| Yoga Care Ltd | Education | 2023 |
| Yomai Limited | Hospitality | 2025 |
| YON Woodcraft Limited | Construction | 2015 |
| YOU & ME Burgers & Snacks Ltd | Hospitality | 2024 |
| YOU Decide Community Interest Company | Other services | 2025 |
| Your Executive Solution Ltd | Professional & scientific | 2026 |
| Your Front DOR Ltd | Real estate | 2022 |
| Your Home Cleaners Ltd | Administrative & support | 2011 |
| Your Online Conversation Limited | Information & communication | 2015 |
| Your Own Builder Limited | Construction | 2017 |
| Your Teachers Limited | Education | 2015 |
| Yourshack Ltd | Information & communication | 2020 |
| Yourway Transport Limited | Transport & logistics | 2004 |
| Ystrd Ltd | Construction | 2025 |
| YT Contract Services Ltd | Construction | 2025 |
| Ytbm Limited | Hospitality | 2026 |
| Yuchi Consulting Ltd | Information & communication | 2021 |
| Yuma Limited | Wholesale & retail | 2025 |
| Yunee Ltd | Information & communication | 2018 |
| Yuva Hospitality Ltd | Hospitality | 2026 |
| Yuvira Ltd | Wholesale & retail | 2025 |
| Yuwish Kitchen and Bedrooms Ltd | Construction | 2023 |
| Yzecommerce Ltd | Wholesale & retail | 2024 |
| Z Plus Motors Ltd | Wholesale & retail | 2024 |
| Z Plus Security Ltd | Administrative & support | 2023 |
| Z-Loc Security Services Ltd | Administrative & support | 2023 |
| Z2A Properties Ltd | Real estate | 2022 |
| Z3S Properties Ltd | Real estate | 2024 |
| ZA Fundings Ltd | Financial services | 2020 |
| Za&Zo Limited | Real estate | 2025 |
| Zabara Limited | Professional & scientific | 2025 |
| Zabek Renovations Ltd | Construction | 2025 |
| ZAC Holdings Ltd | Transport & logistics | 2025 |
| Zacvans Decor Ltd | Other services | 2023 |
| Zafoorah Limited | Wholesale & retail | 2013 |
| Zagonia Limited | Wholesale & retail | 2012 |
| Zahariag Ltd | Construction | 2026 |
| Zahraa Ltd | Wholesale & retail | 2022 |
| Zaika London Ltd | Hospitality | 2026 |
| ZAK Azizi Limited | Professional & scientific | 2016 |
| ZAK Builders Ltd | Construction | 2025 |
| ZAM Cargo Ltd | Transport & logistics | 2020 |
| ZAM Staff Ltd | Administrative & support | 2024 |
| ZAM ZAM Halal Meat Hounslow Limited | Wholesale & retail | 2025 |
| Zamir Consultants Limited | Professional & scientific | 2026 |
| Zams Trading Ltd | Other services | 2019 |
| Zamzam FWM Limited | Wholesale & retail | 2025 |
| Zanvirox Ltd | Wholesale & retail | 2026 |
| Zapa Real Estate Ltd | Real estate | 2025 |
| Zaprawde - Sumienie I Morale Ltd | Manufacturing | 2025 |
| ZAR Car Bodywork Ltd | Wholesale & retail | 2023 |
| Zara Management Limited | Real estate | 2020 |
| Zara ALI Limited | Professional & scientific | 2018 |
| Zaraa Khan Ltd | Wholesale & retail | 2025 |
| Zara’S Patisserie Ltd | Hospitality | 2019 |
| Zase Properties Limited | Real estate | 2023 |
| Zatextiles Ltd | Wholesale & retail | 2026 |
| Zaurac Limited | Wholesale & retail | 2019 |
| Zaviyar Enterprises Limited | Wholesale & retail | 2025 |
| Zavora Limited | Wholesale & retail | 2025 |
| Zavro Technologies Ltd | Wholesale & retail | 2026 |
| ZAW Solutions Limited | Administrative & support | 2004 |
| Zaya Impex Ltd | Wholesale & retail | 2022 |