| Wy&Co Ltd | Manufacturing | 2024 |
| Wyatt Street Management Company Limited | Real estate | 2005 |
| Wychling Properties Limited | Households | 2015 |
| Wychling Properties Management Limited | Households | 2015 |
| Wylde International Ltd | Professional & scientific | 2022 |
| WZ Street Food Limit Limited | Manufacturing | 2021 |
| X Treme Fitness Evolution Ltd | Arts & recreation | 2024 |
| X2CONSULT Ltd | Other services | 2024 |
| Xact Document Solutions Limited | Professional & scientific | 1993 |
| Xander Marketing Limited | Professional & scientific | 2009 |
| Xavier's Incorporation Ltd | Real estate | 2021 |
| Xcel Health Group Ltd | Financial services | 2022 |
| Xcel Health Ltd | Health & social care | 2019 |
| Xcelcare Ltd | Health & social care | 2018 |
| Xcellency Ltd | Administrative & support | 2024 |
| Xelance Ltd | Wholesale & retail | 2024 |
| XENONS4U Ltd | Wholesale & retail | 2012 |
| Xeon Ltd | Information & communication | 2021 |
| Xera-Logic Group Limited | Professional & scientific | 2003 |
| Xezal Melo Ltd | Real estate | 2024 |
| Xezal Sultan Limited | Hospitality | 2026 |
| XH Solutions Ltd | Extraterritorial | 2023 |
| Xiola Limited | Construction | 2019 |
| XL Tiling Ltd | Construction | 2019 |
| XLB Group LLP | | 2020 |
| Xlent Ltd | Construction | 2024 |
| XMO Strata Limited | Construction | 2002 |
| XMO Strata Trustee Limited | Other services | 2024 |
| Xpact Services Limited | Education | 2025 |
| XPD8 Fintech Limited | Information & communication | 2024 |
| Xpress Movers Kent Ltd | Transport & logistics | 2023 |
| Xstream Limited | Manufacturing | 2000 |
| Xtreme Vision Limited | Wholesale & retail | 2025 |
| Y E Groundworks Ltd | Construction | 2019 |
| Y24CONSULT Limited | Professional & scientific | 2025 |
| Yakka DEE Ltd | Information & communication | 2017 |
| Yakka DO Limited | Information & communication | 2025 |
| Yantrakala Ltd | Manufacturing | 2015 |
| Yashish Limited | Hospitality | 2023 |
| Yastar Consultancy Limited | Professional & scientific | 2024 |
| YBA Consult Ltd | Transport & logistics | 2026 |
| YCT Investment Limited | Real estate | 2022 |
| Yellow Caterpillar Childcare Limited | Education | 2023 |
| Yellow O Ltd | Professional & scientific | 2017 |
| Yellow Point Ltd | Wholesale & retail | 2024 |
| Yempej Properties Limited | Real estate | 2017 |
| Yeoman Garage (Bearsted) Limited | | 1977 |
| Yerio Limited | Health & social care | 2020 |
| Yess Recruitment Ltd | Administrative & support | 2025 |
| Yeti Kitchen Limited | Hospitality | 2024 |
| Yeti Momo Ltd | Manufacturing | 2025 |
| Yeti Restaurant Maidstone Ltd | Hospitality | 2016 |
| YEW Tree Farm School C.I.C. | Agriculture & fishing | 2019 |
| YH Autos Ltd | Professional & scientific | 2025 |
| YHA Consulting Ltd | Professional & scientific | 2018 |
| Yingspark Limited | Professional & scientific | 2025 |
| YM Business Recovery Limited | Administrative & support | 2012 |
| Ymcm Holdings Ltd | Financial services | 2019 |
| YMS Travel Limited | Other services | 2014 |
| York and Nottingham Terraces Management Limited | Households | 2001 |
| Yorke House Freehold Company Limited | Households | 2023 |
| Yorokobi Collectibles Co. Ltd | Arts & recreation | 2024 |
| YOU and ME Makes Three Film Limited | Information & communication | 2025 |
| YOU Life Guidance Ltd | Health & social care | 2019 |
| YOU Value Home Improvements Ltd | Construction | 2022 |
| You'Ve GUT This Ltd | Health & social care | 2026 |
| Youdan Investments Ltd | Real estate | 2026 |
| Youdan Properties Ltd | Real estate | 2023 |
| Young & Partners (Motors) Limited | Wholesale & retail | 1973 |
| Young & Partners (Properties) Limited | Real estate | 1999 |
| Your Event Support Service Ltd | Administrative & support | 2026 |
| Your Music School Ltd | Education | 2024 |
| Your Potential Ltd | Health & social care | 2017 |
| Your Property Pals Ltd | Real estate | 2024 |
| Your Soul Calling Limited | Professional & scientific | 2017 |
| Your Surveyors Ltd | Professional & scientific | 2020 |
| Your Time Ltd | Financial services | 2015 |
| Your Virtual PA Ltd | Administrative & support | 2024 |
| Your Vita Nutrition Limited | Information & communication | 2025 |
| Youtellusandwewilltellyou Ltd | Other services | 2020 |
| Yoviiv Ltd | Construction | 2011 |
| Yoyo Run Travel Limited | Administrative & support | 2024 |
| Yulian Express Ltd | Transport & logistics | 2022 |
| Yumdash Ltd | Hospitality | 2025 |
| Yummi Media Group Limited | Professional & scientific | 2010 |
| YURI1969 Ltd | Transport & logistics | 2017 |
| Ywan Foods Limited | Wholesale & retail | 2012 |
| YY Jewelry Limited | Wholesale & retail | 2023 |
| Z & I Solution Ltd | Transport & logistics | 2019 |
| Z & M Care Limited | Health & social care | 1998 |
| Z F Drylining Ltd | Construction | 2025 |
| Z Global Consulting Ltd | Professional & scientific | 2023 |
| Z&Zs Media Ltd | Professional & scientific | 2026 |
| Zafaron Maidstone Ltd | Hospitality | 2026 |
| Zaffron Properties Ltd | Real estate | 2024 |
| ZAM Vaping Ltd | Other services | 2026 |
| ZAM20 Maidstone Ltd | Wholesale & retail | 2024 |
| Zamcall 1 Limited | Wholesale & retail | 2015 |
| ZANJIT19 Limited | Health & social care | 2019 |
| Zannat Ltd | Hospitality | 2024 |