| Wether Homes Ltd | Health & social care | 2023 |
| Wetherby Holdings Limited | Professional & scientific | 2002 |
| Wett Performance Rituals Limited | Wholesale & retail | 2021 |
| Wheatsheaf Strategic Landholding Limited | Real estate | 2016 |
| Wheeler Family Interest Company Limited | Real estate | 2025 |
| Wheelfresh Ltd | Wholesale & retail | 2026 |
| Wheels Refurb TRS Ltd | Wholesale & retail | 2025 |
| Wheelwright House RTM Company Limited | Households | 2014 |
| Whistle Wood and Reffley Wood Limited | Construction | 2012 |
| White Homes Northampton 2 Ltd | Real estate | 2022 |
| White Homes Northampton 3 Ltd | Real estate | 2024 |
| White Homes Northampton Ltd | Real estate | 2020 |
| White Knight Decorating Limited | Construction | 2011 |
| White Lodge Developments Limited | Construction | 2016 |
| White Willow Recruitment Ltd | Administrative & support | 2024 |
| Whiteside Pass Limited | Professional & scientific | 2017 |
| Whitnel Care UK Ltd | Health & social care | 2014 |
| Wilcrom Services Limited | Health & social care | 2016 |
| Wilddog Events Ltd | Arts & recreation | 2019 |
| Wildwood Coffee Limited | Hospitality | 2026 |
| William Logistics Ltd | Transport & logistics | 2026 |
| Willjammer Consulting Limited | Real estate | 2011 |
| Willowbrook Construction Holdings Limited | Financial services | 2016 |
| Willowbrook Plant Ltd | Manufacturing | 2005 |
| Willowbrook Residential Developments Limited | Construction | 2017 |
| Wilson Telecoms Ltd | Administrative & support | 2020 |
| Wincy & REX Limited | Real estate | 2021 |
| Windbell Technology Limited | Information & communication | 2021 |
| Windmill Meadow (Brigstock) Management Company Limited | Households | 2023 |
| Winfra Consulting Ltd | Information & communication | 2015 |
| Winghing NC Ltd | Hospitality | 2023 |
| Wingships Limited | Manufacturing | 2011 |
| Winlift Solutions Ltd | Construction | 2020 |
| Wise Logistics Investments Limited | Financial services | 2017 |
| Wiseglow Auto Ltd | Administrative & support | 2025 |
| WJO Rattigan Limited | Education | 2019 |
| WL Investco Limited | Real estate | 2024 |
| Wojt-Ed Limited | Wholesale & retail | 2016 |
| Wolbu Ltd | Manufacturing | 2013 |
| Wolf Lifting Dynamics Limited | Construction | 2025 |
| Wolfie (UK) Commerce & Co. Limited | Wholesale & retail | 2026 |
| Womb Warriors CIC | Other services | 2025 |
| Wondergarden Group Ltd | Health & social care | 2022 |
| Wonsapone Ltd | Professional & scientific | 2007 |
| Woodglen Leisure Limited | Hospitality | 1996 |
| Wootton Cleaning Services Ltd | Other services | 2025 |
| Worcester Tile & Stone Limited | Construction | 2024 |
| WORKDONE85 Ltd | Wholesale & retail | 2024 |
| Workers Force Limited | Administrative & support | 2025 |
| Worksafe Direct (UK) Limited | Wholesale & retail | 2012 |
| Worksafe Holdings Limited | Financial services | 2024 |
| Workvista Ltd | Administrative & support | 2025 |
| Worldwide Multi Trade UK Ltd | Wholesale & retail | 2025 |
| Wots the Big Idea Limited | Professional & scientific | 2009 |
| Wrapping Studio Ltd | Professional & scientific | 2024 |
| Wringtons Limited | Wholesale & retail | 1995 |
| Wrox Ltd | Transport & logistics | 2011 |
| Wychewood Close 1963 Limited | Extraterritorial | 2014 |
| Wygofamily Ltd | Wholesale & retail | 2025 |
| Wyke Business Protection Ltd | Financial services | 2026 |
| Wyke Financial Limited | Financial services | 2014 |
| Wyke Group Ltd | Financial services | 2026 |
| Wyke Wills & Trusts Ltd | Financial services | 2026 |
| Wynette Ltd | Health & social care | 2022 |
| X-Freights Ltd | Transport & logistics | 2025 |
| XBX Transport Ltd | Transport & logistics | 2023 |
| XIN Kheng AIK Limited | Real estate | 2023 |
| Xtra Capital Limited | Financial services | 2019 |
| Xtra Catering Limited | Hospitality | 2024 |
| Xtra Estates Limited | Real estate | 2024 |
| Xtra Group Companies Limited | Real estate | 2020 |
| Xtra Healthcare Limited | Health & social care | 2016 |
| Xtra Healthcare Services Limited | Health & social care | 2024 |
| Xtrapush Gadgets Ltd | Wholesale & retail | 2026 |
| Y & B Property Group Limited | Real estate | 2024 |
| Yakol Ltd | Transport & logistics | 2009 |
| Yates Ocetek LLP | | 2018 |
| Yayla Food Ltd | Wholesale & retail | 2023 |
| Ycap Ltd | Information & communication | 2011 |
| YE Olde Oak Foods Limited | Wholesale & retail | 1949 |
| Yello Car Hire Limited | Administrative & support | 2004 |
| Ynot 5102 Ltd | Information & communication | 2015 |
| Yogis Corby Ltd | Hospitality | 2025 |
| YOU ARE NOT Alone Care Limited | Health & social care | 2019 |
| Youngstead Ltd | Professional & scientific | 2008 |
| Younique Dance School Limited | Arts & recreation | 2022 |
| Your Local Property Lettings & Sales Ltd | Real estate | 2010 |
| Your People Matter(S) Ltd | Professional & scientific | 2017 |
| Your Problems Solved Ltd | Other services | 2010 |
| Your Ticket Genie Ltd | Administrative & support | 2024 |
| Yrys Trans Limited | Transport & logistics | 2017 |
| Yuheng Realty Limited | Real estate | 2025 |
| YUR Carepro Limited | Professional & scientific | 2026 |
| Z.I.P Pre-Pitched Pads Ltd | Hospitality | 2018 |
| Zaharia.Team Ltd | Education | 2025 |
| Zaisan Properties Limited | Real estate | 2022 |
| ZAL Ecommerce Ltd | Wholesale & retail | 2025 |
| Zane Beauty Ltd | Other services | 2026 |
| Zapcatrans Ltd | Transport & logistics | 2026 |
| Zapcatransport Ltd | Transport & logistics | 2026 |