| Weston Allison Wright Limited | Professional & scientific | 2022 |
| Westwick Melrose & Cromwell Limited | Administrative & support | 2013 |
| Westwoods Property Services Ltd | Construction | 2026 |
| WH Property Ltd | Real estate | 2020 |
| WHEEL2 Ltd | Energy | 2026 |
| Wheelhouse Underwriting Limited | Financial services | 2009 |
| Wheels in the Field Limited | Other services | 2018 |
| Whirling Black Business Services Ltd | Professional & scientific | 2014 |
| Whitcombe Gunn Properties Limited | Real estate | 2019 |
| White Barn Equine Clinic Limited | Professional & scientific | 2005 |
| White Oak Landscaping Ltd | Administrative & support | 2018 |
| White Swan (Rentals) Ltd | Real estate | 2023 |
| Whitelaw Associates Ltd | Professional & scientific | 2004 |
| Whiting & SON Group Limited | Financial services | 2025 |
| WHO Lets Your Dog OUT? Limited | Other services | 2023 |
| Wickerbys C.I.C. | Wholesale & retail | 2025 |
| Wicks Electrical Services Ltd | Construction | 2015 |
| Wiggy’S PUB Company Limited | Hospitality | 2025 |
| Wiktoria Interpreting Ltd | Professional & scientific | 2025 |
| Wildattr Ltd | Wholesale & retail | 2024 |
| Wildens Ltd | Wholesale & retail | 2024 |
| Wilding Construction Limited | Construction | 1995 |
| Wilkinson Property Ltd | Real estate | 2025 |
| Wilkinson Services Ltd | Construction | 2024 |
| Will B Rich Limited | Arts & recreation | 1986 |
| Will Mcintosh Limited | Real estate | 2017 |
| Willerby Caravan Rentals Ltd | Hospitality | 2026 |
| William and Bernard Ltd | Information & communication | 2020 |
| William Lonsdale Limited | Professional & scientific | 2015 |
| William Van DER Hart Limited | Professional & scientific | 2023 |
| Williams Close Management Company Limited | Households | 2019 |
| Willow Farm Equine Assisted Therapy CIC | Education | 2021 |
| Willow Lane Motors Ltd | Wholesale & retail | 2026 |
| Willow Mews Lettings Limited | Real estate | 2019 |
| Willsmere Fields Management Limited | Real estate | 2024 |
| Wilsford 1957 Limited | Extraterritorial | 2013 |
| Wilsford Estates Limited | Real estate | 2011 |
| Wilsford Green CIC | Energy | 2026 |
| Wilsons Site Surveying Limited | Construction | 2002 |
| Wimm Properties Ltd | Households | 2020 |
| Winfield Engineering Limited | Manufacturing | 1974 |
| Wisteria Design & Build Limited | Manufacturing | 2025 |
| Witch Flame Ltd | Manufacturing | 2024 |
| Witch Hunt Limited | Wholesale & retail | 2021 |
| With... Chocolate Ltd | Real estate | 2017 |
| Witham (Specialist Vehicles) Holdings Limited | Extraterritorial | 2020 |
| Witham (Specialist Vehicles) Limited | Wholesale & retail | 1982 |
| Witham Garage EOT Ltd | Professional & scientific | 2022 |
| Witham Holdings Limited | Financial services | 2018 |
| Witham View Limited | Professional & scientific | 2022 |
| Wittgenstein Limited | Real estate | 2017 |
| Wiveton Properties Ltd | Real estate | 2019 |
| WJH Consulting Ltd | Professional & scientific | 2023 |
| WMC Consulting Ltd | Real estate | 2002 |
| WMC Partners Ltd | Administrative & support | 2025 |
| WOK This Way 29 Ltd | Hospitality | 2025 |
| Woldbrook Ltd | Real estate | 2019 |
| Wolff Pack Lettings Ltd | Real estate | 2025 |
| Wolff Pack Ltd | Wholesale & retail | 2022 |
| Wolfgang Financial Limited | Professional & scientific | 2023 |
| Wollathe Ltd | Wholesale & retail | 2021 |
| Wonsaphy Ltd | Wholesale & retail | 2021 |
| Wood Panel Industries Federation | Other services | 1995 |
| Woodbine Health and Safety Solutions Ltd | Professional & scientific | 2020 |
| Woodland Trust (Enterprises) Limited | Wholesale & retail | 1988 |
| Woodland Trust Farming Limited | Agriculture & fishing | 2007 |
| Woodland Trust(The) | Agriculture & fishing | 1986 |
| Woodland Waters Limited | Agriculture & fishing | 1995 |
| Woodlands Rural Ltd | Professional & scientific | 2022 |
| Woodsford Risk LLP | | 2006 |
| Woodsford Underwriting LLP | | 2009 |
| Woodslee Investments Limited | Financial services | 2010 |
| Woodwards Car Care Centre Limited | Wholesale & retail | 2014 |
| Woody's Boarding Kennels Ltd | Agriculture & fishing | 2020 |
| Woof Love Ltd | Other services | 2020 |
| Woolsthorpe Road 1970 Limited | Extraterritorial | 2013 |
| Woolsthorpe Village Shop Limited | Wholesale & retail | 2024 |
| Work Planner Ltd | Information & communication | 2026 |
| Wormalls Limited | Transport & logistics | 2025 |
| Wornzic Ltd | Wholesale & retail | 2021 |
| Worth While Promotions Limited | Administrative & support | 2011 |
| WOS Ltd | Wholesale & retail | 2015 |
| Wpif Environmental Limited | Other services | 2000 |
| Wroxall Drive Flats (Grantham) Limited | Real estate | 1976 |
| WS Prior Ltd | Transport & logistics | 2021 |
| Wyndham Park Tea Rooms Limited | Hospitality | 2022 |
| XA Lock Ltd | Health & social care | 2021 |
| Xemitten Ltd | Wholesale & retail | 2021 |
| Xpag Limited | Manufacturing | 2010 |
| XT Eastcombe Underwriting Limited | Financial services | 2009 |
| Yalonga UK Limited | Financial services | 2021 |
| Yanis Tyre & OIL Ltd | Wholesale & retail | 2024 |
| Yavanika Talkies Limited | Information & communication | 2023 |
| Yellow Market Ltd | Wholesale & retail | 2024 |
| Yellowbelly Farms Ltd | Agriculture & fishing | 2021 |
| Yellowfin Underwriting Limited | Financial services | 2009 |
| YES WE Can-Business Ltd | Professional & scientific | 2016 |
| YM Media Limited | Manufacturing | 2014 |
| York Media Ltd | Manufacturing | 2017 |
| Young's Plumbing & GAS Ltd | Construction | 2024 |