| UK Carbonisation Company Limited | Manufacturing | 2018 |
| UK Management Ltd | Real estate | 2022 |
| UK Premier Pilates Teacher Training School Ltd | Education | 2025 |
| UK Safaris Ltd | Administrative & support | 2025 |
| UK Therapy Services Limited | Public administration | 2014 |
| UMA Retail Ltd | Wholesale & retail | 2025 |
| Un-Bay Limited | Hospitality | 2024 |
| Unveiled Venues Ltd | Financial services | 2022 |
| Urban Fitness (Amble) Ltd | Arts & recreation | 2026 |
| Urban Fitness Alnwick Ltd | Arts & recreation | 2024 |
| Van Match Ltd | Wholesale & retail | 2012 |
| Vapour Tech (Alnwick) Ltd | Wholesale & retail | 2021 |
| Vapour Tech Ltd | Wholesale & retail | 2019 |
| VAR Technology Limited | Construction | 2022 |
| Verityair Systems Ltd | Information & communication | 2026 |
| Vetra Limited | Transport & logistics | 2007 |
| Vistay Ltd | Administrative & support | 2021 |
| Vividline Limited | Construction | 1996 |
| W R Veevers & SON Limited | Construction | 2021 |
| W. Baston (Flooring) Limited | Extraterritorial | 2009 |
| W.Pringle Limited | Wholesale & retail | 1960 |
| Waffling on | Hospitality | 2017 |
| Wagonway House Management Company Limited | Households | 2017 |
| Wagtail Engineering Limited | Professional & scientific | 2014 |
| Wandering Tribe Ltd | Administrative & support | 2016 |
| Wantmakehave Ltd | Professional & scientific | 2022 |
| Warcup Law Firm Ltd | Professional & scientific | 2012 |
| Warkworth House Hotel LLP | | 2012 |
| Washd Valeting Ltd | Wholesale & retail | 2026 |
| Waste Removal Northumberland Limited | Water & waste | 2025 |
| Water-Value Limited | Administrative & support | 2010 |
| Waters Edge Holidays Limited | Hospitality | 2025 |
| WB Cyber Limited | Information & communication | 2026 |
| Wealth Connected Limited | Information & communication | 2025 |
| Weightman Plumbing & Heating Ltd | Construction | 2024 |
| Well Wish Limited | Transport & logistics | 2016 |
| Wendy Pilmer Limited | Professional & scientific | 2008 |
| Werkroom Studios Ltd | Extraterritorial | 2025 |
| Westend Station Limited | Extraterritorial | 2009 |
| Westfield Properties (Seahouses) Ltd | Real estate | 2022 |
| Westpoduk Ltd | Construction | 2023 |
| Wild With Consent Ltd | Administrative & support | 2014 |
| William Hackett Holdings Limited | Administrative & support | 2012 |
| William Hackett Lifting Products Limited | Manufacturing | 2015 |
| Willis of Alnwick Limited | Wholesale & retail | 1991 |
| Willow & Olive Limited | Manufacturing | 2024 |
| Wonkyeye Ltd | Professional & scientific | 2022 |
| Wood and Sons Maintenance & Repairs Ltd | Manufacturing | 2025 |
| Wood Holiday Cottages Ltd | Real estate | 2025 |
| Woods of Berwick Limited | Transport & logistics | 2022 |
| Wooler Bars Limited | Hospitality | 2023 |
| WORKWEAR2GO Ltd | Wholesale & retail | 2006 |
| Worldhead Limited | Wholesale & retail | 2017 |
| Yves Christian Consulting Limited | Professional & scientific | 2017 |