| Whaij Ltd | Health & social care | 2019 |
| What IF? Property Management Limited | Households | 2024 |
| White Rose Spa Limited | Other services | 2023 |
| White Swan Consultancy Services Ltd | Administrative & support | 2006 |
| Whitefriars Management Limited | Professional & scientific | 2019 |
| Whitegate Estates Ltd | Real estate | 2026 |
| Wickford Express Limited | Hospitality | 2026 |
| William Page Property Ltd | Administrative & support | 2025 |
| Wilmot Software Ltd | Information & communication | 2025 |
| Wilsh Consulting Limited | Professional & scientific | 2012 |
| Wilson James Capital Limited | Professional & scientific | 2018 |
| Wilson James Group Limited | Professional & scientific | 2008 |
| Wilsons Coffee Shop Limited | Hospitality | 2022 |
| Window Cleaning Southend Ltd | Administrative & support | 2025 |
| Windy Millers Contract Milling Ltd | Manufacturing | 2020 |
| Winet Ltd | Information & communication | 2016 |
| Wing LEE Limited | Hospitality | 2012 |
| Winruby Limited | Administrative & support | 2021 |
| Winton Lodge Freehold Limited | Households | 2025 |
| Winton Lodge Tenant Association Limited | Households | 1960 |
| Wiresec Ltd | Information & communication | 2024 |
| WIS Publishing Limited | Information & communication | 2009 |
| Wiselee Holding Limited | Financial services | 2026 |
| WISEMAN84 Ltd | Professional & scientific | 2024 |
| Witham Star Limited | Hospitality | 2026 |
| Wittywealth Ltd | Health & social care | 2019 |
| WO Sing Limited | Hospitality | 2003 |
| WOK and Rose Limited | Hospitality | 2026 |
| WOLLATON125 Limited | Hospitality | 2025 |
| Woodbridge Interiors Limited | Manufacturing | 1991 |
| Woodford & Ross Photographic Ltd. | Professional & scientific | 2024 |
| Woodford Storage 9A Ltd | Households | 2025 |
| Woodham Joinery (UK) Ltd | Manufacturing | 2012 |
| Woodsford Properties Limited | Real estate | 2020 |
| Worst Ltd | Wholesale & retail | 2022 |
| Wrane Ltd | Hospitality | 2014 |
| Wren Accountancy (Essex) Limited | Professional & scientific | 2011 |
| WS Management Services Ltd | Professional & scientific | 2019 |
| Xandray Limited | Hospitality | 2019 |
| Xiang YUN Guesthouse Limited | Hospitality | 2018 |
| Xiangxiang Limited | Hospitality | 2026 |
| XIN LEI Catering Limited | Hospitality | 2019 |
| Y Y MAN LLP | | 2019 |
| YAH World Ltd | Health & social care | 2023 |
| Yamer Limited | Hospitality | 2019 |
| Yardley Business Services Ltd | Administrative & support | 2022 |
| Yers Ltd | Hospitality | 2013 |
| Yfink Ltd | Real estate | 2020 |
| YG Healthcare Ltd | Health & social care | 2025 |
| YO Marketer Ltd | Professional & scientific | 2023 |
| York Hall 2 Ltd | Real estate | 2021 |
| York Hall Ltd | Other services | 2021 |
| YOU and Yeti Ltd | Wholesale & retail | 2026 |
| Younis Global Products Ltd | Wholesale & retail | 2021 |
| Your Best Solution Limited | Information & communication | 2026 |
| Yours Cafe Ltd | Hospitality | 2026 |
| Youth and Women Support Network Limited | Hospitality | 2015 |
| YP Empire Limited | Wholesale & retail | 2025 |
| Yuen Trading Limited | Hospitality | 2025 |
| Yuzumi Ltd | Wholesale & retail | 2026 |
| Yy&G Estates Ltd | Real estate | 2023 |
| Z S Consultants Ltd | Households | 2026 |
| Zaara Leigh on Sea Ltd | Hospitality | 2014 |
| Zanore & Co Limited | Wholesale & retail | 2025 |
| Zaynoor Ltd | Wholesale & retail | 2025 |
| Zayrah Living Ltd | Wholesale & retail | 2025 |
| Zelis Legal Ltd | Professional & scientific | 2022 |
| ZEN City & Sakura Limited | Hospitality | 2017 |
| Zenhomeandgarden Ltd | Wholesale & retail | 2026 |
| Zero 11 Ltd | Manufacturing | 2017 |
| Zero 6 Limited | Real estate | 2016 |
| Zero 7 Group Ltd | Financial services | 2024 |
| Zigel 2 Ltd | Hospitality | 2020 |
| ZIGEL1 Ltd | Construction | 2020 |
| Zimplicity Limited | Professional & scientific | 2015 |
| ZM Legacy Investment Ltd | Real estate | 2024 |
| Zsem Services Ltd | Real estate | 2013 |
| ZTS Solutions Limited | Information & communication | 2021 |
| Zuriath Care Services Ltd | Health & social care | 2015 |
| Zvtw Estates Ltd | Real estate | 2025 |