| Waltons Surveying Limited | Construction | 2011 |
| Wansfell Property Services Limited | Construction | 2026 |
| Ward Maritime Limited | Professional & scientific | 2025 |
| Warden Law Developments Limited | Real estate | 1989 |
| Warden Law Kart Club Ltd | Arts & recreation | 2020 |
| Wareda Shah Collection Ltd | Wholesale & retail | 2025 |
| Warm Home Approach Ltd | Construction | 2026 |
| Warm Homes Strategies Ltd | Professional & scientific | 2026 |
| Warmcosy Limited | Construction | 2016 |
| Warmcosy Windows and Doors Ltd | Other services | 2021 |
| Warner of Wingate Limited | Wholesale & retail | 1967 |
| Warren Hughes Racing Limited | Education | 2010 |
| Warriors of Light Ltd | Education | 2025 |
| Warwick Upvc Ltd | Manufacturing | 2014 |
| Warènliu Ltd | Wholesale & retail | 2020 |
| Washington BED Company Ltd | Wholesale & retail | 2024 |
| Watling Hardie Limited | Hospitality | 2017 |
| Watson Contracting Services Ltd | Professional & scientific | 2024 |
| Watson-Cull Associates Limited | Professional & scientific | 2024 |
| Wattmetric Ltd | Information & communication | 2026 |
| Watts Coaching and Consulting Limited | Other services | 2019 |
| Wauchope Windfarm Limited | Energy | 2010 |
| Wauchope Windfarm Partnership LLP | | 2010 |
| Wavelength Psychology Limited | Education | 2015 |
| Waves Festival Limited | Other services | 2022 |
| WAVY22 Ltd | Hospitality | 2022 |
| Way-Finding UK Ltd | Construction | 2019 |
| Waygem Properties Limited | Real estate | 2017 |
| Wayne Coombs Wealth Management Limited | Professional & scientific | 2016 |
| WD & Co Limited | Administrative & support | 2013 |
| WD Secure Services North East Limited | Administrative & support | 2024 |
| WD Security Services North East Ltd | Administrative & support | 2022 |
| WDM Property Group Ltd | Real estate | 2019 |
| WE ARE Panache Community Interest Company | Health & social care | 2018 |
| WE Café and Deli Ltd | Hospitality | 2025 |
| WE Make Culture Community Interest Company | Education | 2017 |
| WE R REC Ltd | Information & communication | 2023 |
| WE R Tyres Limited | Wholesale & retail | 2013 |
| We-Ar Productions Limited | Information & communication | 2026 |
| We-Ar Vehicles Limited | Wholesale & retail | 2013 |
| Wealthy Pillars Global Network Limited | Information & communication | 2025 |
| Wear Access Ltd | Construction | 2023 |
| Wear Beer Ltd | Manufacturing | 2022 |
| Wear Builders Limited | Construction | 2013 |
| Wear Crafts CIC | Arts & recreation | 2026 |
| Wear Drive Ltd | Transport & logistics | 2026 |
| Wear H2 Ltd | Manufacturing | 2025 |
| Wear Heating Ltd | Construction | 2017 |
| Wear Homes Developments Ltd | Real estate | 2023 |
| Wear Homes Investments Ltd | Real estate | 2026 |
| Wear Homes Ltd | Financial services | 2021 |
| Wear Homes Property Management Ltd | Real estate | 2022 |
| Wear Vision Limited | Extraterritorial | 2009 |
| Weardale Holiday Lodges Limited | Hospitality | 2019 |
| Weardigital Limited | Information & communication | 2021 |
| Weare Homes Limited | Construction | 2004 |
| Wearfield Ltd | Wholesale & retail | 2019 |
| Wearflowers Ltd | Wholesale & retail | 2025 |
| Wearside Accommodation Services Limited | Hospitality | 2010 |
| Wearside Arts Forge CIC | Education | 2026 |
| Wearside Executive Limited | Transport & logistics | 2022 |
| Wearside Fencing Limited | Other services | 1993 |
| Wearside Handyman Services Ltd | Construction | 2025 |
| Wearside Home Group Limited | Real estate | 2024 |
| Wearside Home Improvements Ltd | Wholesale & retail | 2017 |
| Wearside Metalworks Limited | Construction | 2024 |
| Wearside Orthodontic Centre Ltd | Health & social care | 2018 |
| Wearside Property Group Ltd | Real estate | 2024 |
| Wearside Property Investors Ltd | Real estate | 2025 |
| Wearside Property Ltd | Real estate | 2018 |
| Wearside Rentals Limited | Real estate | 2026 |
| Wearside Shutters Ltd | Manufacturing | 2015 |
| Wearside Waites Limited | Construction | 2025 |
| Wearside Wheels Ltd | Wholesale & retail | 2024 |
| Webb CDM Ltd | Professional & scientific | 2017 |
| Webster Davidson & Co. Limited | | 1923 |
| Wedding Ceremony Supplies Ltd | Other services | 2026 |
| Weese Keys Ltd | Administrative & support | 2012 |
| Welcome Home Furniture Limited | Wholesale & retail | 2019 |
| Welcome Inn Sunderland Ltd | Hospitality | 2025 |
| Welcome Inn Takeaway Limited | Hospitality | 2015 |
| Welldone Group Ltd | Real estate | 2026 |
| Wellerse Ltd | Information & communication | 2026 |
| Wellington Marketers Limited | Professional & scientific | 2014 |
| Wellness Space Sunderland Ltd | Arts & recreation | 2025 |
| Wesley Construction Ltd | Construction | 2019 |
| Wessington Way Windows Ltd | Manufacturing | 2024 |
| West Benhar Windfarm Limited | Energy | 2011 |
| West Benhar Windfarm Partnership LLP | | 2011 |
| West Estates Development Ltd | Construction | 2018 |
| West Park Industrial Investments Ltd | Construction | 2018 |
| West PAY Limited | Real estate | 2022 |
| West Percy Limited | Wholesale & retail | 2020 |
| West Stream London Ltd | Construction | 2023 |
| Westbrooke Residential Management Ltd | Real estate | 2024 |
| Westburn Residential Limited | Real estate | 2019 |
| Western Park (Hawthorn) Management Company Limited | Households | 2004 |
| Westhome Care Services Ltd | Health & social care | 2010 |
| Westinghouse Brake & Equipment Ltd. | Wholesale & retail | 1996 |
| WF Property Ltd | Real estate | 2021 |