| Westerfield House Ltd | Construction | 1982 |
| Westerfield Management Ltd | Administrative & support | 2016 |
| Westerfield Manor Group Ltd | Real estate | 2018 |
| Westerfield Residential Care Home Ltd | Health & social care | 1969 |
| Westerfield Road Management Company Limited | Administrative & support | 1995 |
| Westgate Building Services Limited | Construction | 2016 |
| Westgate Fried Chicken Ltd | Hospitality | 2025 |
| Westgate Takeaway Ltd | Hospitality | 2025 |
| Westgate Welding Limited | Manufacturing | 2016 |
| Westley Driving School Ltd | Other services | 2014 |
| Westminster Blinds Limited | Wholesale & retail | 2024 |
| Westminsterwealth Advisors Ltd | Extraterritorial | 2026 |
| Westwater Yacht Sales Ltd | Wholesale & retail | 2012 |
| Westwater Yachts (Walton-On-The-Naze) Ltd | Transport & logistics | 2023 |
| Westwood Renewable Energy Ltd | Other services | 2022 |
| Westwoods Construction Ltd | Administrative & support | 2023 |
| Westwoods Felixstowe Ltd | Professional & scientific | 2019 |
| Wetherall AOO Limited | Construction | 2024 |
| Wexel Tiling Group Ltd | Construction | 2023 |
| WEY Meadows Holdings Limited | Real estate | 2022 |
| Weybridge Construction Ltd | Construction | 2020 |
| Weywet Ltd | Health & social care | 2025 |
| WGT Consultancy Ltd | Professional & scientific | 2022 |
| Whale Education Ltd | Education | 2025 |
| Wharf View Capital Limited | Real estate | 2024 |
| What Associates Limited | Professional & scientific | 2014 |
| What's YA Flava Ltd | Wholesale & retail | 2019 |
| Wheatfields (Dickleburgh) Management Company Limited | Households | 2018 |
| Wheathill Campsite Ltd | Hospitality | 2021 |
| Wheatley Group Ltd | Professional & scientific | 2017 |
| Wheatsheaf Court (Colchester) Management Limited | Households | 1986 |
| Wheel Ideas Limited | Information & communication | 2010 |
| Wheelbarrow Imports Ltd | Wholesale & retail | 2019 |
| Wheeler Trevitt Consultants Limited | Professional & scientific | 1995 |
| Wheels 2009 Limited | Wholesale & retail | 2009 |
| Whelan Health Ltd | Public administration | 2019 |
| Wheldon Consultants Limited | Professional & scientific | 2017 |
| Where Does IT Come From? Limited | Manufacturing | 2013 |
| Wherry Quay Marine Limited | | 1986 |
| Wherstead Road Residents Association Limited | Health & social care | 1971 |
| Whip Street Motors Limited | Wholesale & retail | 2002 |
| Whisker Ltd | Other services | 2007 |
| Whitcott Holdings Limited | Professional & scientific | 2015 |
| White & Rotherham Group Ltd | Professional & scientific | 2025 |
| White & Rotherham Hospitality Ltd | Hospitality | 2026 |
| White & Rotherham Property Ltd | Real estate | 2025 |
| White & Rotherham Property Management Ltd | Real estate | 2026 |
| White Christmas Designs Limited | Construction | 2018 |
| White Diamond Beauty Ltd | Other services | 2014 |
| White Diamond Developers Limited | Construction | 2015 |
| White ELM Woodland CIC | Arts & recreation | 2018 |
| White Enamel Limited | Health & social care | 2014 |
| White Formula UK Ltd | Manufacturing | 2008 |
| White House Forge Ltd | Other services | 2015 |
| White Kingfisher Ltd | Wholesale & retail | 2017 |
| White Lion Court Management Limited | Households | 1998 |
| White Lion Hotel Residents Management Company Limited | Real estate | 2018 |
| White Star Ltd | Administrative & support | 2020 |
| Whitebridge Consulting Limited | Professional & scientific | 2007 |
| Whitebridge Venture Consulting Limited | Professional & scientific | 2019 |
| Whitehouse Kebab Ltd | Hospitality | 2023 |
| Whittaker Joinery Ltd | Construction | 2019 |
| Whitton Stores Ltd | Wholesale & retail | 2022 |
| Whitwell Services Limited | Manufacturing | 2016 |
| Whitworth 2011 Ltd | Real estate | 2011 |
| Whiz Transport Ltd | Transport & logistics | 2020 |
| WHO and Y? Limited | Professional & scientific | 2003 |
| Wholeness Physiotherapy Ltd | Health & social care | 2025 |
| Whot Limited | Wholesale & retail | 2016 |
| WHW ENG Ltd | Construction | 2024 |
| WHY Stop Limited | Wholesale & retail | 2008 |
| Whyman Asset Management Ltd | Agriculture & fishing | 2013 |
| Whyman Risk Solutions Ltd | Financial services | 2016 |
| Wickham Care Company (West Suffolk) Ltd | Health & social care | 2020 |
| Wickham Gate (Wickham Market) Management Company Limited | Households | 2022 |
| Wickham Market (Chapel Lane) Management Company Limited | Households | 2014 |
| Widewish Limited | Wholesale & retail | 2025 |
| Wild Card Inc Ltd | Professional & scientific | 2018 |
| Wild MAN Marketing Ltd | Professional & scientific | 2023 |
| Wild Plumbing & Heating Ltd | Construction | 2025 |
| Wild Wellness Retreats Ltd | Health & social care | 2025 |
| Wilde & Greene Ltd | Wholesale & retail | 2019 |
| Wilder Logistics (Felixstowe) Ltd | Transport & logistics | 2011 |
| Wildgoose Fine Foods Limited | Wholesale & retail | 2019 |
| Wilding Tiling Limited | Construction | 2008 |
| Wildrix Group Ltd | Financial services | 2026 |
| Wildshep’S Ltd | Information & communication | 2025 |
| Wildwood Camping Limited | Hospitality | 2016 |
| Wilfrid Properties Limited | Real estate | 2020 |
| Will and Document Protectors Limited | Professional & scientific | 1998 |
| Will Bayley Table Tennis Limited | Arts & recreation | 2013 |
| Will Usher Limited | Administrative & support | 2025 |
| Willabean Ltd | Wholesale & retail | 2023 |
| Willem Schenk LLP | | 2009 |
| Willhall Properties Ltd. | Real estate | 2006 |
| Willi Betz UK Limited | Transport & logistics | 2004 |
| William Langford Tattoos Ltd | Other services | 2018 |
| William. a . Dykes Limited | Health & social care | 2003 |
| Williams Advisory Ltd | Professional & scientific | 2019 |
| Williams Farrall Woodward Ltd | Financial services | 2005 |