| Wood Comfort Ltd | Manufacturing | 2022 |
| Wood OR Wire Limited | Construction | 2021 |
| Wood View Billericay Limited | Construction | 2020 |
| Woodham Holdings Limited | Administrative & support | 2017 |
| Woodland 47 Ltd | Other services | 2022 |
| Woodland Lodge (Hutton) Management Company Limited | Households | 2011 |
| Woodland Parks & Leisure Limited | Construction | 2015 |
| Woods Taylor (Essex) Ltd | Construction | 2014 |
| Woodstock Animal Enterprises Ltd | Agriculture & fishing | 2019 |
| Woodstyle Interiors Ltd | Manufacturing | 2024 |
| Woodstyle Kitchen & Bedroom Limited | Manufacturing | 2024 |
| Woodwise Interiors Limited | Manufacturing | 2025 |
| Woodwright Carpentry & Joinery Ltd | Manufacturing | 2011 |
| Word Practitioners Ministry | Other services | 2024 |
| Working With Boys Limited | Wholesale & retail | 2025 |
| World Design Ltd | Information & communication | 2007 |
| World of Combat Limited | Arts & recreation | 2026 |
| World Star Trading Ltd | Wholesale & retail | 2025 |
| World Travel Shop Ltd | Administrative & support | 2024 |
| Worldbonus Limited | Professional & scientific | 1990 |
| Worrin Properties Limited | Real estate | 2021 |
| Worthycleanz Ltd | Administrative & support | 2025 |
| Wosiwosi Digital Solution Ltd | Information & communication | 2026 |
| Wosiwosi Foods Limited | Wholesale & retail | 2013 |
| Wosl SPV IV Limited | Financial services | 2021 |
| Woulfe Engineering Limited | Professional & scientific | 2023 |
| Woven Grid Ltd | Information & communication | 2025 |
| Wovenbeyond Ltd | Wholesale & retail | 2022 |
| WPC Supplies Ltd | Wholesale & retail | 2025 |
| WR Equipment Ltd | Arts & recreation | 2025 |
| WR Refurbishment Limited | Other services | 2023 |
| Wrapped UP UK Graphics Ltd. | Manufacturing | 2021 |
| Wrenside UK Limited | Other services | 2002 |
| Wrestling Media Limited | Information & communication | 2026 |
| Wright Bespoke Design Limited | Manufacturing | 2024 |
| Wright Electrical & SON Limited | Construction | 2011 |
| Wright Heating and Plumbing Limited | Construction | 2015 |
| Wright Insulation Ltd | Construction | 2015 |
| Wright Travel Consultancy Limited | Administrative & support | 2025 |
| WS Sales & Service Limited | | 1990 |
| WSC Contracts Limited | Administrative & support | 2025 |
| WSH Electrical Ltd | Construction | 2023 |
| WSH Property Maintenance Limited | Households | 2026 |
| WT Asbestos Essex Limited | Other services | 2023 |
| WT Building Contractors Ltd | Construction | 2011 |
| WT Consult Limited | Professional & scientific | 2018 |
| WT Fire Limited | Manufacturing | 2022 |
| WTE Global Ltd | Water & waste | 2019 |
| WU Technologies Ltd | Information & communication | 2014 |
| WW Trading U.K Limited | Professional & scientific | 2020 |
| Wyatt Contractors Limited | Manufacturing | 2013 |
| Wyatt's Welders Limited | Construction | 2014 |
| X&F Construction Home Improvements Ltd | Construction | 2025 |
| Xcel Logistics Ltd | Transport & logistics | 2011 |
| Xcesspoint Ltd | Information & communication | 2023 |
| Xcoynz Ltd | Other services | 2018 |
| Xeti Ltd | Wholesale & retail | 2025 |
| XP Construction Ltd | Construction | 2024 |
| XP Consulting Limited | Professional & scientific | 2015 |
| Xpert Security Group Ltd | Administrative & support | 2017 |
| Xpertfunding Limited | Financial services | 2001 |
| Xray Yards Limited | Real estate | 2017 |
| Y&H Associates Limited | Information & communication | 2012 |
| Yahya Tandoori Limited | Hospitality | 2025 |
| Yalpaak Limited | Health & social care | 2022 |
| Yamunaji Limited | Wholesale & retail | 2024 |
| YAR & DIM Limited | Other services | 2018 |
| Yasaaa Services Ltd | Professional & scientific | 2024 |
| Yastog Ltd | Wholesale & retail | 2022 |
| Yazaki Europe Limited | Wholesale & retail | 1980 |
| YBE Ltd | Information & communication | 2025 |
| YCG - Your Consultants Gurus Limited | Information & communication | 2025 |
| Yemak Consult Ltd | Real estate | 2022 |
| Yemlister Care Limited | Administrative & support | 2023 |
| Yenko Logistics Ltd | Transport & logistics | 2025 |
| Yewdale Properties Limited | Administrative & support | 2003 |
| YFW Online Limited | Wholesale & retail | 2025 |
| Yinkss Limited | Health & social care | 2013 |
| YK Analytic Limited | Other services | 2024 |
| YMA Transport Ltd | Wholesale & retail | 2021 |
| Yohan Yophi Caribbean European Salon Ltd | Other services | 2017 |
| Yolo Motors and Recovery Ltd | Wholesale & retail | 2025 |
| Yolsk Ltd | Other services | 2013 |
| Yoni Ltd | Transport & logistics | 2025 |
| Yoospace Ltd | Real estate | 2018 |
| York Road (Billericay) Management Company Limited | Households | 1989 |
| Yorkman Group Ltd | Construction | 2019 |
| YOU Beauty Cambridge Ltd | Other services | 2025 |
| Youeatitalian Ltd | Manufacturing | 2019 |
| Yougothis Ltd | Wholesale & retail | 2025 |
| Young and Sunny Trading Limited | Wholesale & retail | 2023 |
| Young Gubbings Limited | Transport & logistics | 2007 |
| Young Railway Signalling Limited | Information & communication | 2010 |
| Your Birthing Journey Ltd | Health & social care | 2025 |
| Your DO IT Yourself Centre Limited | Wholesale & retail | 2010 |
| Your Hotel Integration (Contracts) Limited | Administrative & support | 1998 |
| Your Perfect Flowers Ltd | Other services | 2025 |
| Your Personal Jeweller LLP | | 2009 |
| Your the Girl Limited | Wholesale & retail | 2018 |
| Your Vision Home Improvements Ltd | Construction | 2025 |