| WGX Ltd | Information & communication | 2018 |
| WH Recycling Ltd | Water & waste | 2025 |
| WH Turton Investments Ltd | Real estate | 2018 |
| WHB Construction Services Limited | Construction | 2020 |
| Whiley Rentals Ltd | Households | 2024 |
| Whimsical Trading Post Limited | Wholesale & retail | 2019 |
| Whippersnapper Properties Limited | Real estate | 2020 |
| White Cube Promotions Ltd | Administrative & support | 2003 |
| White Dog Property Development Ltd | Construction | 2021 |
| White Grove Consulting Ltd | Professional & scientific | 2008 |
| White Grove Property Ltd | Real estate | 2020 |
| White House Commercial Services Ltd | Professional & scientific | 2018 |
| White Lady Funerals Limited | Extraterritorial | 1936 |
| Whitedust.C Ltd | Manufacturing | 2026 |
| Whitehouse Building Limited | Construction | 2017 |
| Whitehouse Fish Bar Limited | Hospitality | 2019 |
| Whitehouse GAS and Plumbing Ltd | Construction | 2024 |
| Whites Removals Ltd | Transport & logistics | 2011 |
| Whittle Painting Contractors Ltd | Construction | 2022 |
| Wholesale Building Materials Limited | Wholesale & retail | 2026 |
| WHS C S Ltd | Manufacturing | 2025 |
| WHS Central Services Ltd | Administrative & support | 2017 |
| WHS Holdco 1 Limited | Other services | 2018 |
| WHS Plastics Limited | Manufacturing | 1961 |
| WHS Plastics Runcorn Ltd | Manufacturing | 2002 |
| Whynot Service Station Limited | Wholesale & retail | 2016 |
| Whyse Ltd | Professional & scientific | 2025 |
| Wicklen (Midlands) Limited | Professional & scientific | 2013 |
| Wide Bridges Limited | Construction | 2009 |
| Wide Horizons | Other services | 2002 |
| Wide Open Throttle Limited | Administrative & support | 2006 |
| Wiekert Property Refurbishment & Development Ltd | Real estate | 2025 |
| Wild Wizard Ltd | Information & communication | 2025 |
| Wildwood Florist Limited | Other services | 2018 |
| Wilkes Brothers Ltd | Real estate | 2023 |
| Wilkes Properties Ltd | Real estate | 2023 |
| Wilks Solutions Limited | Information & communication | 2017 |
| Willesley Investments Limited | Real estate | 2014 |
| William Pearce & Son,Limited | Extraterritorial | 1938 |
| William Yeates Ltd | Professional & scientific | 2023 |
| Willis Business Enterprises Ltd | Wholesale & retail | 2008 |
| Willows Care Limited | Health & social care | 2004 |
| Willtang Tech Limited | Information & communication | 2019 |
| Wilmshurst & Dickson Limited | Extraterritorial | 1969 |
| Wilson & Webb Ltd | Construction | 2017 |
| Wilson Contracts Ltd | Construction | 2023 |
| WIN Holdings Limited | Financial services | 2018 |
| Window S.O.S Ltd | Construction | 2019 |
| Windyridge Property Investments Limited | Construction | 2018 |
| Winfield Property Group Ltd | Real estate | 2024 |
| Winner Education Limited | Administrative & support | 2019 |
| Winner FM Limited | Administrative & support | 2024 |
| Winner Racing Limited | Arts & recreation | 2024 |
| Winner Recruitment (Birmingham) Ltd | Administrative & support | 2010 |
| Winross Birmingham LLP | | 2023 |
| Winsun KO Lighting Ltd | Wholesale & retail | 2025 |
| Winterfam Limited | Professional & scientific | 2009 |
| Wiredu Properties Ltd | Real estate | 2019 |
| Wise Style IT Ltd | Information & communication | 2011 |
| Wiseman Taxation Consultants Limited | Professional & scientific | 2003 |
| Wish Salon Limited | Other services | 2008 |
| Wishaw Finance Limited | Financial services | 2015 |
| Wishaw Flooring Ltd | Construction | 2022 |
| Wishaw Riding Centre Limited | Arts & recreation | 1994 |
| Wishaw Trading Ltd | Extraterritorial | 2023 |
| Wishingwellproperties Ltd | Real estate | 2025 |
| Wisteria Care Agency Ltd | Health & social care | 2011 |
| With Love Ziggy Limited | Wholesale & retail | 2025 |
| Wizards With Property Ltd | Real estate | 2022 |
| WK & Co Accountants Limited | Professional & scientific | 2015 |
| Wlasmw Ltd | Health & social care | 2022 |
| Wmislt Limited | Health & social care | 2013 |
| Wocopoto Ltd | Information & communication | 2015 |
| WOK to Success Ltd | Hospitality | 2019 |
| Wolff Pipelines Ltd | Extraterritorial | 2015 |
| Women's Professional Golf Association | Arts & recreation | 1985 |
| Wong’S Brotherhood Limited | Construction | 2023 |
| Woodbury Homes Limited | Construction | 2022 |
| Woodbury Housing Limited | Real estate | 2020 |
| Woodfield Park Funeral Home Ltd | Extraterritorial | 2000 |
| Woodfield ST George Limited | Administrative & support | 2018 |
| Woodhall Property Limited | Construction | 2025 |
| Woodheath Property Limited | Real estate | 2022 |
| Woodhouse Hotel Ltd | Hospitality | 2022 |
| Woodline Construction Ltd | Construction | 2023 |
| Woodrow Takeaway Ltd | Hospitality | 2023 |
| Woods Warehouse Ltd | Wholesale & retail | 2024 |
| Woodside (Streetly Lane) Limited | Households | 2000 |
| Woodside Anaesthetic Practice Limited | Health & social care | 2009 |
| Woodside Corporate Finance Limited | Professional & scientific | 2009 |
| Woodstock Drive Management Company Limited | Households | 1995 |
| Woodstock Flooring & Carpentry Ltd | Construction | 2021 |
| Woodthorne Grange Management Limited | Households | 2020 |
| Woodview Business Solutions Limited | Professional & scientific | 1999 |
| Woof Local Ltd | Information & communication | 2020 |
| Woof Properties Limited | Real estate | 2012 |
| Woollaston Estates Limited | Real estate | 2013 |
| Woollastons Solicitors Ltd | Professional & scientific | 2016 |
| Work Public Relations Limited | Professional & scientific | 2006 |
| Work Signals Limited | Information & communication | 2025 |