| Weddel Meats Limited | Wholesale & retail | 1985 |
| Weddel Swift (Exports) Limited | Wholesale & retail | 1998 |
| Weddel Swift (Imports) Limited | Wholesale & retail | 1998 |
| Weddel Swift (Trading) Limited | Wholesale & retail | 1998 |
| Weddel Swift Distribution Limited | Wholesale & retail | 1984 |
| Wedding Cinema Club Limited | Information & communication | 2018 |
| Wellbeing Fitness Education Centre Ltd | Education | 2020 |
| Wellbeing Fitness Limited | Arts & recreation | 2009 |
| Wemix Limited | Wholesale & retail | 2017 |
| Wenan Group Limited | Financial services | 2026 |
| Wenan Homes Ltd | Real estate | 2021 |
| West Park Consulting Limited | Professional & scientific | 2009 |
| West Park Ventures Limited | Construction | 2018 |
| West Park Whittlebury LLP | | 2010 |
| Wheatley Amps Holdings Ltd | Financial services | 2016 |
| Wheels to Work Silverstone | Wholesale & retail | 2020 |
| Whisky Bravo Ltd | Information & communication | 2026 |
| Whitecliffs,Limited | Construction | 1935 |
| Whitepark Services Ltd | Wholesale & retail | 2018 |
| Whittlebury Estates Limited | Extraterritorial | 2017 |
| Whittlebury Hall & Spa Limited | Hospitality | 2011 |
| Whittlebury Lodge Limited | Construction | 2005 |
| Whittlebury Paddocks LLP | | 2013 |
| Whittlebury Park Enterprises Limited | Financial services | 2012 |
| Whittlebury Park Golf & Country Club Limited | Extraterritorial | 2010 |
| Wibley Sports Ltd | Wholesale & retail | 2018 |
| Wikeley Solutions Limited | Manufacturing | 2012 |
| Wild Focus Photography Limited | Professional & scientific | 2025 |
| Wilde 4 IT Limited | Information & communication | 2006 |
| WILDE4ENTERPRISES Ltd | Hospitality | 2023 |
| Wildfire Live Creative Management Agency Ltd | Professional & scientific | 2023 |
| Wildfire Live Events Ltd | Professional & scientific | 2023 |
| Wildfire Live Limited | Professional & scientific | 2022 |
| Wildfire Live Media Ltd | Manufacturing | 2023 |
| Wildfire Live Security Ltd | Administrative & support | 2023 |
| Wildfire Live Ticketing Ltd | Wholesale & retail | 2023 |
| Wilford & Dean Ltd | Extraterritorial | 2012 |
| Willow & Rose Interiors Limited | Wholesale & retail | 2020 |
| Wilson Invests Limited | Information & communication | 2016 |
| Wintle's Workshop Ltd | Wholesale & retail | 2025 |
| Wise Guys Film Limited | Professional & scientific | 2017 |
| Wishagift Limited | Wholesale & retail | 2019 |
| Wittering Communications Limited | Wholesale & retail | 2018 |
| Wolfhill Limited | Real estate | 2000 |
| Wolfish (Delingpole) Ltd | Information & communication | 2012 |
| Wonderful & Weird Ltd | Real estate | 2023 |
| Wood Dragon Ltd | Information & communication | 2024 |
| Woodcote and Copse Limited | Wholesale & retail | 2017 |
| Woodfern Ltd | Administrative & support | 2017 |
| Woodhism Community Interest Company | Agriculture & fishing | 2020 |
| Woodpecker Way RTM Company Limited | Households | 2022 |
| Woods Consultants Limited | Financial services | 2018 |
| Woof N' Whiskers Pet Care Services Ltd | Arts & recreation | 2021 |
| Woolgrowers Field Ltd | Construction | 2020 |
| Woolwich Bridge Ltd | Professional & scientific | 2015 |
| Work and Wheels Ltd | Extraterritorial | 2003 |
| Work Research Limited | Professional & scientific | 2018 |
| Working Bodies Limited | Health & social care | 2007 |
| WORLDWIDE101 Holdings Ltd | Financial services | 2016 |
| WSC Finance Ltd | Financial services | 2022 |
| WSC Risk and Protection Ltd | Financial services | 2025 |
| Wyatt James (Property Investments) Ltd | Real estate | 2016 |
| Wyatt James Limited | Professional & scientific | 2008 |
| X-Right Engineering Ltd | Manufacturing | 2014 |
| Xachoh Limited | Professional & scientific | 2018 |
| XPB Images Ltd | Professional & scientific | 2012 |
| XSW Group Ltd | Financial services | 2025 |
| Xtraction Live UK Limited | Arts & recreation | 2026 |
| Yabbie Ltd | Construction | 2023 |
| Yaqoob Holdings Ltd | Other services | 2018 |
| Yardley Arts Community Interest Company | Other services | 2012 |
| Yardley Hair & Beauty Lounge Ltd | Other services | 2022 |
| YCT Trading Ltd | Administrative & support | 2018 |
| YEW - Prop Ltd | Real estate | 2013 |
| Yew-Homes Ltd | Real estate | 2020 |
| Yigido 27 Ltd | Hospitality | 2025 |
| Yosensi UK Limited | Information & communication | 2023 |
| YOU & ME Properties Limited | Real estate | 2017 |
| Your Cloud Works Ltd | Information & communication | 2010 |
| Your I-Hub Ltd | Extraterritorial | 2019 |
| Youth Mindfulness Education CIC | Administrative & support | 2016 |
| Youyi Management Limited | Real estate | 2024 |
| Yuhr Ltd | Construction | 2026 |
| Yume Interiors Ltd | Professional & scientific | 2025 |
| YVC Management Limited | Hospitality | 2019 |
| Yyhm Ltd | Real estate | 2024 |
| YZE Holding Limited | Financial services | 2020 |
| Zakapps Software UK Limited | Information & communication | 2018 |
| ZAP & Toes Limited | Wholesale & retail | 2015 |
| Zapasnik Plumbing and Heating Limited | Construction | 2022 |
| Zest Physiotherapy Ltd | Extraterritorial | 2026 |
| Zest Racecar Engineering Ltd | Arts & recreation | 2016 |
| ZIP Kart (International) Limited | Wholesale & retail | 2012 |
| ZIP Kart Limited | Manufacturing | 1989 |
| Zixia Limited | Financial services | 2012 |
| Zoom Taxi Management Ltd | Transport & logistics | 2025 |
| Zusammen Group Ltd | Professional & scientific | 2025 |
| Zusammen LLP | | 2022 |
| ZW Consultants Limited | Wholesale & retail | 2024 |