| Waterhounds Ltd | Other services | 2011 |
| Waterhouse Braintree Ltd | Wholesale & retail | 2023 |
| Waterloo PT Property Holdings Limited | Real estate | 2021 |
| Wats Accounting Ltd | Professional & scientific | 2014 |
| Watson Associates (Accountants) Ltd | Real estate | 2003 |
| Watt Wise Ltd | Construction | 2024 |
| Watts Curran Roofing Group Limited | Construction | 2026 |
| WAVE2 Limited | Information & communication | 2000 |
| Wayfarers Flying Club Ltd | Transport & logistics | 2020 |
| Wayne Evans Brickwork Ltd | Construction | 2022 |
| WBE Management Limited | Financial services | 2018 |
| WE Should Talk Ltd | Health & social care | 2007 |
| Webhive Digital Limited | Professional & scientific | 2023 |
| Weighed on Site Ltd | Wholesale & retail | 2026 |
| Welland Power Technology Ltd | Professional & scientific | 2018 |
| WEMAKE4U Ltd | Manufacturing | 2026 |
| Wentworth Court Management Limited | Households | 1983 |
| Wesley 100 International Limited | Other services | 2024 |
| West Corp IT Limited | Information & communication | 2005 |
| West Essex Security Limited | Information & communication | 2018 |
| Westgarth Lettings Ltd | Real estate | 2017 |
| Westgrey Properties Limited | Administrative & support | 1998 |
| Wethersfield 1956 Limited | Extraterritorial | 2015 |
| WGB One Ltd | Hospitality | 2026 |
| Wheatsheaf Mews Development Ltd | Construction | 2022 |
| Whippet Retreat Limited | Hospitality | 2022 |
| Whispering Woods Ltd | Wholesale & retail | 2025 |
| White ARC Welding Services Ltd | Manufacturing | 2024 |
| White Bodyworks Limited | Wholesale & retail | 2025 |
| White Crane Property Group Ltd | Financial services | 2018 |
| White Crane Property Investments Ltd | Real estate | 2018 |
| White Crane Property Services Ltd | Real estate | 2018 |
| White Dove Communications Ltd | Wholesale & retail | 2018 |
| White Elegance Supplier Ltd | Wholesale & retail | 2023 |
| White Light Design Associates Limited | Arts & recreation | 1998 |
| Whitehouse Logistics Limited | Extraterritorial | 2019 |
| Whittons Consulting Limited | Professional & scientific | 2018 |
| Whizz Kids Pre-School (Hockley) Limited | Health & social care | 2015 |
| WHOLELIFE-10 Limited | Professional & scientific | 2015 |
| Wicks Experience Ltd | Hospitality | 2025 |
| Wickwar Farms Limited | Agriculture & fishing | 2014 |
| Widford Property Land Limited | Construction | 2022 |
| Wildlife.Farm Ltd | Agriculture & fishing | 2025 |
| Wildlife.Lawyer Ltd | Professional & scientific | 2025 |
| Wildlife.Movie Ltd | Information & communication | 2025 |
| Wilkinson-Jennings Financial Services Ltd | Financial services | 2024 |
| Will Protect Limited | Other services | 2011 |
| Will's Workbench Model Railways Limited | Wholesale & retail | 2022 |
| Willenbrock Ltd | Professional & scientific | 2025 |
| Williams Accident Repair Limited | Wholesale & retail | 2022 |
| Williams Drive Management Company Limited | Households | 2011 |
| Willing Care UK Limited | Health & social care | 2019 |
| Willis Global Limited | Administrative & support | 2015 |
| Willow and MAW Limited | Wholesale & retail | 2025 |
| Willow Housing Developments Ltd | Construction | 2025 |
| Willows Hair Hub Ltd | Other services | 2025 |
| Wingman Marketing Ltd | Administrative & support | 2018 |
| Winniebuild Developments Limited | Construction | 2014 |
| Wise Renew Ltd | Energy | 2019 |
| Wivenhoe Properties Limited | Real estate | 2016 |
| WIX Farms Limited | Agriculture & fishing | 2014 |
| WIZ Technology Limited | Manufacturing | 2024 |
| Wizard Press Limited | Manufacturing | 2019 |
| WOK Wraps Ltd | Hospitality | 2024 |
| WOLFPACK13.MOVIE Ltd | Information & communication | 2025 |
| Wondercat & Buddy Ltd | Real estate | 2019 |
| Woodbridge Road Healthcare Ltd | Wholesale & retail | 2009 |
| Woodchests Limited | Other services | 2017 |
| Woodland Castle Limited | Construction | 2006 |
| Woodstock Solutions Limited | Construction | 2019 |
| Woodwrights Furniture Limited | Manufacturing | 2013 |
| Woofie Supplies Ltd | Wholesale & retail | 2024 |
| Woofs and Waves Ltd | Administrative & support | 2025 |
| Woohoo App Ltd | Information & communication | 2026 |
| Woolaccom Ltd | Hospitality | 2022 |
| Woolfenden Developments Ltd | Real estate | 2021 |
| Woolfood Ltd | Hospitality | 2022 |
| Wooltown Property Four Ltd | Real estate | 2024 |
| Wordsrider Limited | Professional & scientific | 2006 |
| Working SIX Days a Week Limited | Wholesale & retail | 2014 |
| Workmaze Limited | Education | 2000 |
| Workshop Studios London Limited | Professional & scientific | 2026 |
| Worldtech Electronics Ltd | Wholesale & retail | 2012 |
| Worthpr Limited | Professional & scientific | 2013 |
| Wortley Hyett & Griffiths Limited | Financial services | 1964 |
| Wren Electrics Ltd | Construction | 2014 |
| Wrench Elite Services Limited | Construction | 2016 |
| Wrenovations Limited | Construction | 2023 |
| Wright Family Investors Limited | Financial services | 2023 |
| WS Distribution Limited | Real estate | 2025 |
| WWB Enterprise Ltd | Professional & scientific | 2024 |
| Wyndcrest Investments Limited | Administrative & support | 2009 |
| Wyndcrest Limited | Construction | 2015 |
| Xlbi Ltd | Information & communication | 2012 |
| Xpedia Limited | Administrative & support | 2009 |
| Xpediator Limited | Financial services | 2016 |
| Yeldham Sand & Gravel Limited | Wholesale & retail | 2015 |
| Yelo Taxis Limited | Extraterritorial | 2012 |
| YES WE Caption Limited | Manufacturing | 2015 |
| Yiayiamaritsa Limited | Arts & recreation | 2019 |