| William Davis Limited | Construction | 1949 |
| Willoughby Bowls Club Ltd | Arts & recreation | 2023 |
| Willoughby Wraparound Childcare Limited | Health & social care | 2023 |
| Willow Bay Productions Limited | Information & communication | 2015 |
| Willow Construction Management Services Ltd | Construction | 2017 |
| Willow Rise Estates Ltd | Real estate | 2025 |
| Wilmots & Co Ltd | Professional & scientific | 2013 |
| Wilson & Wilson Estates Ltd | Real estate | 2019 |
| Wilson Bros. (Loughborough) Limited | Construction | 1936 |
| Wilson Investment Group Limited | Construction | 2022 |
| Wilton Street Group Ltd | Real estate | 1974 |
| WIN Group International Ltd | Professional & scientific | 2019 |
| Windover Court Estate Management Company Limited | Households | 2018 |
| Windsorgate Limited | Construction | 1999 |
| Winf Limited | Information & communication | 2023 |
| Wing Tian U.K. Investment Ltd. | Hospitality | 2019 |
| Wing Tian U.K. Property Ltd. | Real estate | 2021 |
| Wingfield Apex Limited | Health & social care | 2014 |
| Winjoinery Limited | Construction | 2010 |
| Winner's Circle Consultancy Ltd | Administrative & support | 2020 |
| Winsor Properties Limited | Real estate | 2019 |
| Winterdyne Properties Limited | Real estate | 2002 |
| Wipemaster Limited | Wholesale & retail | 2010 |
| Wire Tree Limited | Real estate | 1974 |
| Wiredworks Electrical Installation Engineers Limited | Construction | 2025 |
| Wireless Social Holdings Limited | Administrative & support | 2019 |
| Wireless Social Limited | Professional & scientific | 2003 |
| Wishmiq Ltd | Information & communication | 2025 |
| Wisla Loughborough Ltd | Wholesale & retail | 2015 |
| WJB57 Ltd | Wholesale & retail | 2018 |
| WK Electrical Services Limited | Construction | 2010 |
| WLP Welding Ltd | Construction | 2015 |
| WLR Legal Holdings Ltd | Administrative & support | 2019 |
| WMK Catering Ltd | Hospitality | 2025 |
| Wolds Developments LLP | | 2022 |
| Wolds FS Ltd | Construction | 2006 |
| Wolf Auto Services Ltd | Wholesale & retail | 2019 |
| Wood and Johncock Ltd | Real estate | 2020 |
| Woodborough Admin Services Ltd | Administrative & support | 2024 |
| Woodbrook Vale School | Education | 2011 |
| Woodcock Care Services Ltd | Health & social care | 2019 |
| Woodgate Financial Planning Ltd | Financial services | 2003 |
| Woodhayes Investments Ltd | Financial services | 2024 |
| Woodhouse Property Solutions Ltd | Construction | 2014 |
| Woodland Grove Residents Management Company Limited | Real estate | 2014 |
| Woodro Homes Ltd | Real estate | 2025 |
| Woodro Ltd | Construction | 2024 |
| Woolley, Beardsleys & Bosworth LLP | | 2012 |
| Wooly Sales Limited | Wholesale & retail | 2026 |
| Worklounge Limited | Real estate | 2023 |
| Workplace Consulting Limited | Extraterritorial | 2009 |
| World Class Football Limited | Arts & recreation | 2019 |
| World of Afrika Limited | Wholesale & retail | 2025 |
| World of Goodness Limited | Financial services | 2023 |
| World of Goodness UK Midco 1 Limited | Financial services | 2023 |
| World of Goodness UK Midco 2 Limited | Financial services | 2023 |
| World of Little BEE Ltd | Wholesale & retail | 2022 |
| World of Sweets (Bonds) Limited | Wholesale & retail | 1999 |
| World of Sweets (Distribution) Limited | Wholesale & retail | 2002 |
| World of Sweets Group Limited | Professional & scientific | 2012 |
| World of Sweets Limited | Professional & scientific | 2016 |
| Worth-It Positive Education CIC | Education | 2018 |
| Woven Image (UK) Limited | Wholesale & retail | 2000 |
| WOW Consultancy Services Ltd | Administrative & support | 2023 |
| WQ China Import & Export Service Ltd | Professional & scientific | 2021 |
| Wrapped Lifestyle Limited | Extraterritorial | 2018 |
| Wright and Rose Limited | Professional & scientific | 2012 |
| Wright Fitting Composites Ltd | Manufacturing | 2017 |
| WRM Haulage Ltd | Wholesale & retail | 2024 |
| WRP Design & Construction Limited | Construction | 2021 |
| Wrttn OFF Limited | Wholesale & retail | 2025 |
| WX Floating OW Ltd | Financial services | 2021 |
| Wyetronics Ltd | Manufacturing | 2014 |
| Wymeswold Pharmacy Limited | Wholesale & retail | 2002 |
| Wynne Crest Limited | Health & social care | 2002 |
| X L Designs (Midlands) Limited | Real estate | 2007 |
| Xact Packing Limited | Administrative & support | 2022 |
| Xaira XYZ Ltd | Wholesale & retail | 2025 |
| Xanton Holdings Limited | Financial services | 2021 |
| Xcros Furniture Limited | Manufacturing | 2026 |
| XD Retail LLP | | 2013 |
| Xecpro Services Limited | Professional & scientific | 2018 |
| XES Holdings Ltd | Administrative & support | 2023 |
| XL Commercial & Residential Interiors Limited | Construction | 2025 |
| XLU Ltd | Professional & scientific | 2017 |
| Y S F Electrical Services Ltd | Construction | 2021 |
| Yadev Limited | Real estate | 1995 |
| Yakii Express Limited | Real estate | 2015 |
| Yakii Loughborough Ltd | Hospitality | 2024 |
| Yangjin Dale Ecommerce Co. Ltd | Professional & scientific | 2019 |
| Yard.Reclaim.Coffee Ltd | Wholesale & retail | 2026 |
| Yarny Consulting Limited | Information & communication | 2018 |
| YAY Mimo Ltd | Wholesale & retail | 2026 |
| YC Real Estate Investment Ltd | Real estate | 2022 |
| Yelkar Holdings Ltd | Real estate | 2023 |
| Yelkar Investments Ltd | Financial services | 2020 |
| Yelkar Limited | Real estate | 1987 |
| Yelkar Trading Ltd | Financial services | 2023 |
| Yellow Dog Creative Studio Ltd | Information & communication | 2020 |
| Yellow Leaf Limited | Real estate | 2023 |