| Yautha Holdings Ltd | Hospitality | 2022 |
| Yauvan Limited | Wholesale & retail | 2020 |
| Yaw's Kitchen Limited | Hospitality | 2014 |
| YBS Services Ltd | Professional & scientific | 2017 |
| YCH Catering Ltd | Hospitality | 2013 |
| YCJ London Limited | Real estate | 2026 |
| YCK Anchor Holdings Limited | Real estate | 2026 |
| YCK Ebiz Ltd | Wholesale & retail | 2023 |
| YCN Capital Limited | Financial services | 2026 |
| Ycom Ltd | Information & communication | 2006 |
| YDY Building Services Ltd | Extraterritorial | 2018 |
| Yeado & Co. Ltd | Professional & scientific | 2025 |
| Yeetip Limited | Information & communication | 2023 |
| Yeez Construction Ltd | Construction | 2023 |
| Yekki Events Ltd | Arts & recreation | 2024 |
| Yekki Productions Ltd | Arts & recreation | 2022 |
| Yellow Aspect Limited | Administrative & support | 2012 |
| Yellow BE Ltd | Information & communication | 2020 |
| Yellow Box Holdings Limited | Financial services | 2019 |
| Yellow Castle Limited | Other services | 2020 |
| Yellow Door Communications Ltd | Extraterritorial | 2024 |
| Yellow Hail Painters Ltd | Construction | 2024 |
| Yellow HUT Limited | Real estate | 2018 |
| Yellow Leaves Ltd. | Professional & scientific | 2014 |
| Yellow Rose 21 Limited | Information & communication | 2021 |
| Yellow Sapphire Events Ltd | Other services | 2020 |
| Yellowfin Hold Limited | Extraterritorial | 2013 |
| Yellowstone Global Partners Ltd | Information & communication | 2026 |
| Yelsa Ltd | Wholesale & retail | 2020 |
| Yemeni Peace Committee CIC | Education | 2025 |
| Yepplo Ltd | Wholesale & retail | 2020 |
| YES Currency FX Ltd | Financial services | 2016 |
| YES Property Investment Ltd | Real estate | 2015 |
| YES UK Immigration Ltd | Other services | 2015 |
| YES Ventures Ltd | Information & communication | 2016 |
| YES2CHAI Ltd | Hospitality | 2023 |
| Yesoon Limited | Real estate | 2018 |
| YEW Financials Limited | Transport & logistics | 2024 |
| YEW Stone Regeneration Limited | Professional & scientific | 2015 |
| YEW Supermarket Limited | Wholesale & retail | 2022 |
| YEW Technologies Ltd | Information & communication | 2013 |
| YEW Tree Court (Bovingdon) Management Company Limited | Households | 1988 |
| YEW Trees Properties Ltd | Real estate | 2020 |
| Yewandeye Ltd | Wholesale & retail | 2023 |
| YGC Commercial Ltd | Information & communication | 2023 |
| Yiannimize Events Limited | Financial services | 2019 |
| Yiannimize Media Limited | Professional & scientific | 2018 |
| Yiannimize Modifications Limited | Wholesale & retail | 2011 |
| Yield-Force Ltd | Professional & scientific | 2026 |
| Yihai (UK) Food Ltd | Wholesale & retail | 2019 |
| Yippee Theatre Ltd | Arts & recreation | 2024 |
| YJP Ltd | Health & social care | 2022 |
| YJY Ltd | Wholesale & retail | 2017 |
| YK Services Limited | Transport & logistics | 2019 |
| YKG Holdings Ltd | Hospitality | 2026 |
| Ylyutza Ursachi Ltd | Construction | 2023 |
| YM Coach Ltd | Transport & logistics | 2010 |
| YMD Construction Ltd | Construction | 2023 |
| YMK Accountancy Ltd | Extraterritorial | 2014 |
| YMP Consulting Limited | Professional & scientific | 2023 |
| YMS Holding Corporation PTY Ltd | Real estate | 2023 |
| YMY Investment Limited | Real estate | 2019 |
| YNK Ltd | Wholesale & retail | 2013 |
| YNK Properties Ltd | Real estate | 2020 |
| YNS Properties Limited | Real estate | 2016 |
| YOC Construction Ltd | Construction | 2025 |
| Yodel Solar Panel Service Ltd | Construction | 2024 |
| Yoga Paradise Ltd | Other services | 2010 |
| Yoga Union City Ltd | Arts & recreation | 2023 |
| Yoga With Aastha Ltd | Health & social care | 2026 |
| Yogalina Corporate and Events Limited | Other services | 2024 |
| Yogalina Limited | Education | 2021 |
| Yogalina Oxford Limited | Other services | 2025 |
| Yogasphere Ltd | Information & communication | 2025 |
| Yogi 21 Investment Company Ltd | Financial services | 2021 |
| Yogi Decorators Ltd | Construction | 2023 |
| Yogi Divine Society UK Limited | Extraterritorial | 2014 |
| Yogi Engineering Ltd | Professional & scientific | 2023 |
| Yogi Estate Agents Ltd | Real estate | 2021 |
| Yogi Hotels Limited | Administrative & support | 2026 |
| Yogi STD Limited | Wholesale & retail | 2025 |
| Yogi's SRI Lankan Kitchen Ltd | Hospitality | 2022 |
| Yogigita Limited | Wholesale & retail | 2025 |
| Yogiji Limited | Wholesale & retail | 2021 |
| Yogiraj Law Ltd. | Professional & scientific | 2025 |
| Yolka What Sheap Ltd | Transport & logistics | 2024 |
| Yolmsen Limited | Health & social care | 2017 |
| Yolo Mobile Development and Consultancy Ltd | Information & communication | 2023 |
| Yong Construction Ltd | Construction | 2025 |
| Yoonion Limited | Real estate | 2021 |
| Yoonju Limited | Hospitality | 2023 |
| York House Felixstowe Limited | Construction | 2020 |
| York House Pharma Limited | Professional & scientific | 2007 |
| York Terrace Properties Limited | Professional & scientific | 2012 |
| Yorkshire Knee Surgery Limited | Health & social care | 2024 |
| Yorkshire Orthopaedics & Surgical Specialists LLP | | 2021 |
| YOU ARE Uncommon Ltd | Administrative & support | 2020 |
| YOU GOT This Ltd | Education | 2023 |
| YOU TEC Ltd | Wholesale & retail | 2018 |
| YOU Want Cake Ltd | Manufacturing | 2022 |