| Vyrax Ltd | Wholesale & retail | 2026 |
| Vyro Space Ltd | Wholesale & retail | 2026 |
| Vyvd Ltd | Professional & scientific | 2022 |
| W 2 S Limited | Professional & scientific | 2003 |
| W-B UK | | 1994 |
| W. H. Guntrip Ltd. | Other services | 2012 |
| W. H. Guntrip Painting & Decorating Limited | Construction | 2025 |
| Waponi Limited | Professional & scientific | 2007 |
| Wardhaughs Ltd | Professional & scientific | 2024 |
| Warmbrick Homes Ltd | Construction | 2026 |
| Watermelon Media Ltd | Information & communication | 2024 |
| Watkins & Middleton Catering Limited | Hospitality | 2023 |
| Watkins & Middleton Limited | Hospitality | 2021 |
| WCS (MK) Ltd | Administrative & support | 2024 |
| Wealth Capital Holding AH Limited | Real estate | 2023 |
| Web Design MK Ltd | Information & communication | 2018 |
| Webbline UK Limited | Wholesale & retail | 2019 |
| Weight Loss Riga Limited | Administrative & support | 2019 |
| Welcome Break Birchanger Limited | Professional & scientific | 2006 |
| Welcome Break Burger King Limited | Extraterritorial | 2006 |
| Welcome Break Coffee Primo Limited | Professional & scientific | 2005 |
| Welcome Break Finance (2) Limited | Professional & scientific | 2003 |
| Welcome Break Finance (3) Limited | Professional & scientific | 2003 |
| Welcome Break Gretna Green Partnership | | 2025 |
| Welcome Break Group Limited | Wholesale & retail | 1996 |
| Welcome Break Holdings (1) Limited | Financial services | 2000 |
| Welcome Break Holdings (2) Limited. | Financial services | 2002 |
| Welcome Break Holdings Limited | Financial services | 1996 |
| Welcome Break KFC Limited | Professional & scientific | 2005 |
| Welcome Break KFC Starbucks Limited | Extraterritorial | 2006 |
| Welcome Break Limited | Wholesale & retail | 1983 |
| Welcome Break Mcdonald's Limited | Professional & scientific | 2009 |
| Welcome Break NO. 1 Limited | Financial services | 2012 |
| Welcome Break NO. 2 Limited | Financial services | 2012 |
| Welcome Break Services Limited | Wholesale & retail | 2000 |
| Welcome Break Starbucks Burger King Limited | Extraterritorial | 2009 |
| Welcome Break Starbucks Mcdonald's Limited | Professional & scientific | 2010 |
| Welcome Break Starbucks Waitrose Burger King Limited | Extraterritorial | 2009 |
| Welcome Break Starbucks Waitrose KFC Limited | Extraterritorial | 2009 |
| Welcome Break Waitrose KFC Limited | Professional & scientific | 2009 |
| Welcome Break Waitrose Limited | Professional & scientific | 2008 |
| Welcomegain Property Management Limited | Real estate | 1992 |
| Wellies Day Nursery Limited | Health & social care | 2011 |
| Wells Associates Limited | Information & communication | 2018 |
| Wendale Property Ltd | Real estate | 2020 |
| Wentworth Accountancy Limited | Professional & scientific | 2018 |
| Wentworth Advisory Ltd | Professional & scientific | 2015 |
| WER3 Limited | Administrative & support | 2024 |
| Wesley Plumbing and Heating Limited | Construction | 2011 |
| Westfourstreet Limited | Information & communication | 2012 |
| Westfriers Limited | Hospitality | 2024 |
| Westone Prospectors Limited | Real estate | 1966 |
| WFA Support Limited | Information & communication | 2018 |
| What's the Drama Ltd | Health & social care | 2016 |
| Whickham Home Improvements Ltd | Construction | 2024 |
| Whickham Landscaping Ltd | Administrative & support | 2024 |
| Whitespace Growth Limited | Professional & scientific | 2025 |
| Whiteways at Ddns Limited | Information & communication | 2021 |
| Willards (MK) Limited | Wholesale & retail | 2003 |
| Williams Alder Ltd | Real estate | 2011 |
| Williamsitsolutions Ltd | Information & communication | 2025 |
| Willowbee Consulting Limited | Information & communication | 2025 |
| Wilson-Lea Ltd | Administrative & support | 2013 |
| Wilted Rose Publishing Limited | Information & communication | 2023 |
| Woad Corner Limited | Construction | 2003 |
| Woburn Landscaping Limited | Administrative & support | 2024 |
| Woburn Property Group Limited | Real estate | 2025 |
| Wolverton Employment Project Limited | Administrative & support | 1994 |
| Wood's Flooring (Milton Keynes) Limited | Construction | 1987 |
| Word Go Limited | Information & communication | 2008 |
| Word of Light International Ministries Ltd | Other services | 2012 |
| Work Fleet Consultancy Services Limited | Wholesale & retail | 2025 |
| World Cheerleading Company Limited | Arts & recreation | 2012 |
| Worldwide Event Structures Ltd | Arts & recreation | 2023 |
| Wpfg Limited | Real estate | 2017 |
| WTA FIC Ltd | Professional & scientific | 2025 |
| Your Claims Portal MK Ltd | Administrative & support | 2025 |
| Your Place Hotels Ltd | Hospitality | 2022 |
| Youtopia Ltd | Professional & scientific | 2017 |
| Z&A Travel Ltd | Administrative & support | 2025 |
| Zack's Repairs Limited | Wholesale & retail | 2019 |
| Zemzem Trading Limited | Hospitality | 2024 |
| Zenvic Meats Ltd | Other services | 2021 |
| Zest Associates UK Limited | Other services | 2016 |
| Zinzino UK Ltd | Wholesale & retail | 2013 |
| Zizo Software Limited | Information & communication | 1999 |
| Zumbach Electronics Limited | Manufacturing | 1975 |