| Ynka Group Ltd | Construction | 2026 |
| Yo&Yo Limited | Construction | 2017 |
| Yofuria Group Ltd | Real estate | 2026 |
| Yoga Property Limited | Real estate | 2022 |
| Yogan Investments Limited | Real estate | 2021 |
| Yogendranadh Limited | Wholesale & retail | 2025 |
| Yogi Inc Ltd | Real estate | 2025 |
| Yogi J C Ltd | Wholesale & retail | 2025 |
| Yogiji News Limited Liability Partnership | | 2024 |
| Yogjiwan Ltd | Arts & recreation | 2020 |
| Yola Consulting Ltd | Transport & logistics | 2018 |
| Yolkster & Co Ltd | Wholesale & retail | 2026 |
| Yolo Services Limited | Information & communication | 2020 |
| Yom.Arch Ltd | Professional & scientific | 2021 |
| Yootro Limited | Information & communication | 2017 |
| Yorgos Studio Limited | Administrative & support | 2003 |
| York Developments Limited | Real estate | 1998 |
| York Property & Asset Management Ltd | Real estate | 2025 |
| Yorkshire Essence Limited | Manufacturing | 2026 |
| Yoshi Studios Limited | Other services | 2025 |
| Yosis Kitchens Ltd | Wholesale & retail | 2019 |
| YOU & ME Care Ltd | Health & social care | 2014 |
| YOU and I Fostering Services UK Ltd | Health & social care | 2024 |
| Youbiz Solutions Limited | Professional & scientific | 2024 |
| Youhan Beauty Solutions Ltd | Wholesale & retail | 2020 |
| Young & Co Accountants Limited | Professional & scientific | 2008 |
| Young & Woods Limited | Manufacturing | 1968 |
| Young Minds Education Ltd | Education | 2024 |
| Youngs Road Management (Hastingwood Court) Limited | Households | 1985 |
| Your Building Solutions Limited | Construction | 2021 |
| Your Business Pals Ltd | Administrative & support | 2022 |
| Your Car Chemest Limited | Wholesale & retail | 2025 |
| Your Choice Construction Service Limited | Construction | 2020 |
| Your Complete Care Limited | Health & social care | 2022 |
| Your Digital Work Ltd | Professional & scientific | 2023 |
| Your Energy Broker Ltd | Administrative & support | 2022 |
| Your Estate Management Ltd | Administrative & support | 2017 |
| Your Event AK Ltd | Hospitality | 2023 |
| Your Everyday Secretarial Ltd | Professional & scientific | 2021 |
| Your Ideal Ltd | Professional & scientific | 2019 |
| Your Law 24/7 Ltd | Professional & scientific | 2016 |
| Your Nursery Shop Ltd | Wholesale & retail | 2024 |
| Your Premier Rentals Ltd | Real estate | 2026 |
| Your Projects Limited | Education | 2021 |
| Your Smile POD Ltd | Health & social care | 2024 |
| Your Utility Company Limited | Administrative & support | 2017 |
| Your Utility Group Limited | Administrative & support | 2017 |
| Your Wedding Photography Ltd | Professional & scientific | 2020 |
| Yourcocoon Ltd | Health & social care | 2026 |
| Yourmart Ltd | Wholesale & retail | 2025 |
| Yours Favourite Chicken and Ribs Limited | Hospitality | 2024 |
| Yousafina Ltd | Wholesale & retail | 2026 |
| Yousold Limited | Professional & scientific | 2022 |
| Youth Educare | Education | 2011 |
| Youth in Sport CIC | Arts & recreation | 2020 |
| Youth Reality Homes Ltd | Health & social care | 2016 |
| Youth With a Global Vision Limited | Education | 2005 |
| Youwin Education Ltd | Education | 2022 |
| YP Financial Solutions Limited | Professional & scientific | 2019 |
| YP Healthcare Ltd | Extraterritorial | 2010 |
| YPG Construct Limited | Construction | 2017 |
| YPS UK Holdings Ltd | Real estate | 2015 |
| YRB Horizon Ltd | Wholesale & retail | 2025 |
| YRB Innovations Ltd | Wholesale & retail | 2025 |
| YRM Financial Solutions Ltd | Financial services | 2016 |
| YRM Investment Ltd | Real estate | 2022 |
| YRM Service Ltd | Health & social care | 2021 |
| YS Commerce Ltd | Wholesale & retail | 2026 |
| YS Gants Hill Ltd | Hospitality | 2022 |
| YS Medical Supplies Limited | Wholesale & retail | 2020 |
| YS Properties London Limited | Real estate | 2024 |
| YS Traders Ltd | Administrative & support | 2019 |
| Yslg Estates Ltd | Financial services | 2026 |
| YSM Global Consultancy Limited | Professional & scientific | 2021 |
| Ysmc Ltd | Wholesale & retail | 2025 |
| Yspharm Ltd | Wholesale & retail | 2016 |
| Ysri Ltd | Real estate | 2025 |
| Ysri Software Limited | Information & communication | 2008 |
| Ysrikanth Consultant Ltd | Information & communication | 2018 |
| Ystore Limited | Wholesale & retail | 2018 |
| YT KAS Ltd | Financial services | 2022 |
| YTS Building Ltd | Construction | 2023 |
| YTS Car Paints Ltd | Wholesale & retail | 2017 |
| YUCY42 Ltd | Professional & scientific | 2024 |
| Yukon Consultants Ltd | Professional & scientific | 2023 |
| Yulian Logistic Ltd | Transport & logistics | 2018 |
| YUM Nibbles Ltd | Hospitality | 2023 |
| YUM Stop Ltd | Hospitality | 2025 |
| YUM YUM Delish Yummy Ltd | Other services | 2023 |
| Yummee Foods Ltd | Other services | 2021 |
| Yummy Dosa Ltd | Hospitality | 2023 |
| Yummy Health and Beauty Care Limited | Other services | 2020 |
| Yummy HUT Ltd | Hospitality | 2018 |
| Yummy Karachi Food Limited | Hospitality | 2019 |
| Yummy Pizza Ltd | Hospitality | 2026 |
| Yurkolana Ltd | Construction | 2025 |
| Yusra Properties Ltd | Real estate | 2022 |
| Yusraa Ltd | Professional & scientific | 2026 |
| Yusuf & Associates Limited | Professional & scientific | 2025 |
| Yusuf Properties Ltd | Real estate | 2019 |