| White Lodge (Newmarket) Management Company Limited | Households | 1999 |
| White Media UK Limited | Administrative & support | 2009 |
| Whitehat Premium Healthcare Ltd | Health & social care | 2021 |
| Whitehat Technologies Limited | Information & communication | 2010 |
| Whites Solutions Ltd | Construction | 2023 |
| White’S Brokering Ltd | Wholesale & retail | 2020 |
| Whitford Investments Ltd | Financial services | 2023 |
| Whitshade Consulting Ltd | Information & communication | 2025 |
| Whittlesford Station Road Management Company Limited | Households | 2008 |
| Wholesale Flower Trade Limited | Wholesale & retail | 2021 |
| WHS Essex Limited | Wholesale & retail | 2013 |
| Whykay Business and Datum Solutions Limited | Information & communication | 2015 |
| Wicatam Support Services Limited | Professional & scientific | 2013 |
| Wickham House Management Limited | Households | 1983 |
| Wickhams Wharf Management Limited | Households | 1985 |
| Wigmore Jones Limited | Real estate | 2011 |
| Wild 'N' Wacky Ltd | Arts & recreation | 2008 |
| Wild Tiger Property Investments Ltd | Real estate | 2022 |
| Wildheart Rebels Ltd | Information & communication | 2024 |
| Wilk-Trans Ltd | Transport & logistics | 2019 |
| Will NOT Comply Ltd | Professional & scientific | 2026 |
| Will U Remember ME Ltd | Professional & scientific | 2023 |
| Williams & Partners Limited | Financial services | 2008 |
| Williams Experts Limited | Health & social care | 2026 |
| Willis Enterprises Ltd | Administrative & support | 2017 |
| Willmott & Lake Ltd | Real estate | 2024 |
| Willow Grange Residents Management Company Limited | Households | 2011 |
| Willow Place Holdings Limited | Financial services | 2018 |
| Willow Place Property Limited | Real estate | 2018 |
| Willow Walk Management Co. Limited | Households | 1998 |
| Wills Skip Hire Ltd | Water & waste | 2019 |
| Wilsamo Limited | Professional & scientific | 2007 |
| Wilson Davies & Co Ltd | Professional & scientific | 2023 |
| Wilsonclark Limited | Construction | 2021 |
| Windmill Luxury Stays Ltd | Real estate | 2023 |
| Windows Doors Conservatories Limited | Construction | 2023 |
| Winmax Estate Limited | Real estate | 2021 |
| Winmax Platform Innovation Ltd | Professional & scientific | 2023 |
| Winners Golden Chance Ventures Limited | Real estate | 2020 |
| Winnold's Green Property Limited | Households | 2005 |
| Wintry Shells Ltd | Information & communication | 2023 |
| Wipe & GLO Ltd | Wholesale & retail | 2025 |
| Wired Weird Productions Ltd | Information & communication | 2025 |
| Wise FIN Ltd | Information & communication | 2024 |
| Wise Global Services Limited | Health & social care | 2017 |
| Wiseman Contracting Solutions Ltd | Construction | 2025 |
| Wizmoe Limited | Health & social care | 2025 |
| Wizrd Limited | Manufacturing | 2012 |
| WJ Secretarial Services Ltd | Administrative & support | 2017 |
| WJC Cleaning & Maintenance Services Ltd | Administrative & support | 2024 |
| WJM Property & Maintenance Ltd | Real estate | 2021 |
| WJS Haulage Ltd | Transport & logistics | 2019 |
| WK9 Services Limited | Administrative & support | 2023 |
| WK9 Training Services Limited | Professional & scientific | 2025 |
| WLE Trading Ltd | Wholesale & retail | 2025 |
| WLJ Estates Ltd | Real estate | 2023 |
| WM Legal Holdings Limited | Financial services | 2026 |
| WM Legal Services Limited | Professional & scientific | 2020 |
| Wofida Property Ltd | Real estate | 2026 |
| Wolf & HAT Ltd | Professional & scientific | 2019 |
| Woloch Limited | Construction | 2020 |
| Woman of Elegance Ltd | Professional & scientific | 2021 |
| Wondershops Ltd | Wholesale & retail | 2025 |
| Woodcote (Milton Keynes) Management Company Limited | Households | 1991 |
| Woodcutters Meadow Management Company Limited | Households | 2003 |
| Woodford House (Residents Association) Limited | Households | 1978 |
| Woodland Barks Limited | Other services | 2025 |
| Woodland Chase (IMC) Management Company Limited | Households | 2010 |
| Woodland Corporate Interiors Limited | Professional & scientific | 2003 |
| Woodpoint Management & Consultancy Limited | Professional & scientific | 2021 |
| Woods Building Services Limited | Water & waste | 1994 |
| Woods END Management Company Limited | Households | 2011 |
| Woodside (Milton Keynes) Management Company Limited | Households | 2001 |
| Woodstock Street Lighting Services Ltd | Construction | 2016 |
| Wooji (UK) Limited | Wholesale & retail | 2016 |
| Woollensbrook Management Company Limited | Households | 1982 |
| Woowcontractors Ltd | Construction | 2017 |
| Work Solution Ltd | Administrative & support | 2011 |
| Workerbee Consult Ltd | Wholesale & retail | 2011 |
| World Bizlink Services Ltd | Wholesale & retail | 2020 |
| World Produce Services Limited | Wholesale & retail | 2007 |
| Worldwide Cleaning Support Limited | Administrative & support | 1996 |
| Worldwide PPE Ltd | Manufacturing | 2025 |
| Wormleybury Manor Limited | Households | 1995 |
| Worn Studios Ltd | Information & communication | 2025 |
| Worth Court (Monkston) Residents Association Limited | Households | 2002 |
| Worthedge Consulting Limited | Professional & scientific | 2023 |
| Wotton Homes Ltd | Real estate | 2015 |
| Woven Technology Consultants Ltd | Information & communication | 2023 |
| WOW Wizz Ltd | Wholesale & retail | 2024 |
| Woyinprebi Properties Limited | Real estate | 2022 |
| Wpak Properties Limited | Real estate | 2022 |
| Wren Building Company Limited | Construction | 1980 |
| Wright’S Milling Limited | Manufacturing | 2020 |
| WRJ Developments Ltd | Construction | 2023 |
| WRS Rail Limited | Construction | 2016 |
| WS Boutique Ltd | Wholesale & retail | 2024 |
| WSA Cleaning Services Limited | Administrative & support | 2019 |
| WSL Group Ltd | Financial services | 2022 |
| WSL Property Ltd | Construction | 2022 |