| Work IT Events Ltd | Arts & recreation | 2017 |
| Work IT Group Ltd | Arts & recreation | 2017 |
| Work IT Studios Ltd | Arts & recreation | 2017 |
| Work Vibrant Ltd | Professional & scientific | 2014 |
| Worker BEE Properties Ltd | Real estate | 2025 |
| Workero Limited | Construction | 2025 |
| Workllama Ltd | Information & communication | 2022 |
| World Word Translations Limited | Professional & scientific | 2024 |
| Wrea Green Management Company Limited | Households | 2011 |
| Wrexham Road Garden Village Management Company Limited | Households | 2019 |
| Wrongly Accused Ltd | Professional & scientific | 2016 |
| WSC London Ltd | Manufacturing | 2018 |
| WVG Properties Ltd | Real estate | 2024 |
| WW Business Services Limited | Professional & scientific | 2016 |
| Wwld Limited | Construction | 2019 |
| Wycliffe Court (Battersea) Management Co. Limited | Households | 1996 |
| Wygate Management Company Limited | Households | 2012 |
| Wymington Road (Rushden) Management Company Limited | Households | 2013 |
| Wyndhams Ground Services Ltd | Administrative & support | 2014 |
| Xclusiv Classics Limited | Wholesale & retail | 2021 |
| Xeno Estates Limited | Real estate | 2018 |
| XF Design Limited | Construction | 2013 |
| Xtra Construction Limited | Construction | 2022 |
| Xtra Loft Space Limited | Construction | 2020 |
| Xtra Property Development Limited | Real estate | 2023 |
| YAH Holistic Therapy CIC | Health & social care | 2020 |
| Yanis Daniel Auto Limited | Wholesale & retail | 2017 |
| Yarn Street (Hunslet) Management Company Limited | Households | 2009 |
| Yasmina & Dana Ltd | Transport & logistics | 2025 |
| YEW Gardens (Edlington) Management Company Limited | Households | 2012 |
| YEW Gardens Management Company Limited | Households | 2015 |
| YEW Tree Lane Management Company Limited | Professional & scientific | 2024 |
| YEW Tree Park Management Company Burscough Limited | Households | 2018 |
| Yewlands Holdings Ltd | Financial services | 2021 |
| Ylim Limited | Hospitality | 2014 |
| Yonyk Decorations Ltd | Wholesale & retail | 2025 |
| Yorkshire Basements Limited | Construction | 2023 |
| Young Life International | Other services | 2002 |
| Your Legacy Limited | Other services | 2024 |
| Your Option Services Ltd | Other services | 2021 |
| Your Property Solution Partner Ltd | Real estate | 2022 |
| Youx Ltd | Information & communication | 2024 |
| Yskye Global Ltd | Wholesale & retail | 2025 |
| Zakirah London Ltd | Administrative & support | 2015 |
| Zeniga Limited | Information & communication | 2009 |
| Zevorify Ltd | Wholesale & retail | 2025 |
| Zigzag SVS Limited | Construction | 2021 |
| Zintra Holdings Limited | Financial services | 2026 |
| Zobek Ltd | Arts & recreation | 2024 |
| Zoetrope Limited | Professional & scientific | 2021 |
| Zoon Link Limited | Administrative & support | 2007 |