| Winners Bingo Limited | Arts & recreation | 2002 |
| Winney Enterprise Ltd | Transport & logistics | 2025 |
| Winster Property Developments Limited | Administrative & support | 2001 |
| Winston Bakery Ltd | Manufacturing | 2022 |
| Winston Capital Ltd | Wholesale & retail | 2021 |
| Winter Ground Limited | Real estate | 2002 |
| Winter ICT Services Limited | Information & communication | 2023 |
| Winton Upholstery & Design Limited | Manufacturing | 2015 |
| Wintwire Holdings Ltd | Financial services | 2020 |
| Wintwire Limited | Manufacturing | 2001 |
| Winwick Land Investments Limited | Construction | 2020 |
| Winworld Innovative Solutions Hub Ltd | Information & communication | 2024 |
| Wire Agencies UK Limited | Professional & scientific | 2017 |
| Wire Magazine Limited(The) | Information & communication | 1984 |
| Wire Mill Estates Limited | Real estate | 2012 |
| Wired by Walkers Ltd | Construction | 2024 |
| Wireframe Studio Limited | Professional & scientific | 2003 |
| Wirelessforyou Ltd | Information & communication | 2018 |
| Wirelessinc Ltd | Information & communication | 2010 |
| Wisdom & SON Motors Ltd | Wholesale & retail | 2014 |
| Wise Owls Tutoring Ltd | Education | 2021 |
| Wise Security Systems Ltd | Administrative & support | 2018 |
| Wiseadvisergroup Ltd | Financial services | 2018 |
| Wisecourt Limited | Real estate | 2013 |
| Wisen Allen Services Ltd | Education | 2023 |
| Wiseton Court Limited | Households | 1987 |
| Wiseweb Property Investment Limited | Real estate | 2024 |
| Wiseweb Technology Limited | Information & communication | 2005 |
| Wisewood Hydro Ltd | Energy | 2015 |
| Wisniewski Deliveries Ltd | Transport & logistics | 2025 |
| Wisteria Gardens Management Company Limited | Households | 2005 |
| Wistl Ltd | Information & communication | 2026 |
| Witchwood Production House Limited | Information & communication | 2016 |
| Witchy Craft Design Ltd | Wholesale & retail | 2024 |
| With Bells Records Ltd | Arts & recreation | 2016 |
| Withamley Limited | Agriculture & fishing | 2019 |
| Withbio Scientific Limited | Wholesale & retail | 2026 |
| Within Reach (Sheffield) | Professional & scientific | 1995 |
| Within Reason (Sheffield) Limited | Wholesale & retail | 2001 |
| Witoo Limited | Wholesale & retail | 2022 |
| Wittea Media Ltd | Professional & scientific | 2025 |
| Witteveen+Bos UK Limited | Professional & scientific | 2015 |
| Witton Consultancy Limited | Professional & scientific | 2021 |
| WIX & Burn Candle Company Ltd | Wholesale & retail | 2024 |
| WIZ Impex Ltd | Professional & scientific | 2025 |
| Wizard Shrimp Games Ltd | Information & communication | 2022 |
| Wizecare Solution Limited | Administrative & support | 2025 |
| Wizzy WOW Limited | Information & communication | 2012 |
| WJ K Head Ltd | Hospitality | 2024 |
| WJ Media Limited | Professional & scientific | 2024 |
| Wjls Properties Ltd | Real estate | 2022 |
| WJS Holdings Ltd | Real estate | 2016 |
| WJS Property Developments Ltd | Real estate | 2020 |
| WK Drylining Ltd | Construction | 2014 |
| WL Leisure Ltd | Hospitality | 2019 |
| Wlka Holding Limited | Financial services | 2022 |
| Wlka Properties Ltd | Real estate | 2021 |
| WLV Ltd | Information & communication | 2023 |
| WM & JD Properties Ltd | Real estate | 2003 |
| WM Services Engineering Limited | Manufacturing | 2012 |
| WMI Limited | Manufacturing | 1944 |
| WMT Holdings Ltd | | 2016 |
| WN Networks Ltd | Construction | 2019 |
| Wntd Cars Ltd | Information & communication | 2023 |
| Woensdag Limited | Administrative & support | 2022 |
| WOH Limited | Other services | 2026 |
| Wohanka and Associates Limited | Professional & scientific | 2000 |
| WOK Dale Limited | Hospitality | 2018 |
| WOK Express U.K. Limited | Hospitality | 2021 |
| Woken-Outdoors Ltd | Wholesale & retail | 2025 |
| Wokie Box Limited | Hospitality | 2022 |
| Wokometry Limited | Hospitality | 2020 |
| Wolf & Co Mens Hairdressing Limited | Other services | 2009 |
| Wolf Clothing Collective Ltd | Wholesale & retail | 2020 |
| Wolf Safety Lamp Company Limited(The) | Manufacturing | 1916 |
| Wolf Ultra Ltd | Wholesale & retail | 2025 |
| Wolff Onsite Limited | Administrative & support | 2015 |
| Wolffkran Limited | Construction | 2015 |
| Wolfride Clothing Ltd | Wholesale & retail | 2015 |
| Wolfshark Ltd | Information & communication | 2017 |
| Wollaton Trade Ltd | Hospitality | 2021 |
| Wolseley Road Gym Ltd | Arts & recreation | 2018 |
| Woltrex Limited | Agriculture & fishing | 2012 |
| Wolverhampton Abrasives Limited | Extraterritorial | 1965 |
| Womanthology Limited | Information & communication | 2013 |
| Wombwell Convenience Store Limited | Wholesale & retail | 2025 |
| Women Colab Ltd | Information & communication | 2020 |
| Women in Security Enterprise UK Ltd | Hospitality | 2025 |
| Women of Automotive UK Limited | Professional & scientific | 2026 |
| Women of South Yorkshire C.I.C. | Education | 2025 |
| Women to Work Ltd | Administrative & support | 2014 |
| Women's Best UK Ltd. | Manufacturing | 2018 |
| Womersley Restoration Limited | Water & waste | 2019 |
| Womy Developments Limited | Real estate | 2017 |
| Wondeerful Ltd | Wholesale & retail | 2018 |
| Wonder Comms Limited | Professional & scientific | 2025 |
| Wonderbody Ltd | Other services | 2025 |
| Wonderful Catering Ltd | Manufacturing | 2024 |
| Wonderful Network (UK) Limited | Wholesale & retail | 2010 |
| Wonderful S5 Ltd | Hospitality | 2025 |