| Windmill Hill Fruits (PX) Limited | Hereford | 2025 |
| Windmill Hill Fruits Limited | Hereford | 2014 |
| Windmill Lakes Ltd | Biggleswade | 2003 |
| Windmill Retreats Farm Ltd | Harrogate | 2025 |
| Windmill Stud Farm Ltd | Oxford | 2025 |
| Windmill Stud Ltd | Swindon | 2015 |
| Windmill View Farm Ltd | Aylesbury | 2024 |
| Windmill Wood Limited | Ewloe | 2023 |
| Windward Services Ltd | Dunoon | 2020 |
| Windwhistle Farms Limited | Romsey | 1993 |
| Windy Bank Dairy Farm Limited | Liversedge | 1985 |
| Windy Hill Eggs Limited | Omagh | 2026 |
| Windy Hollow Farm Limited | By Auchterarder | 2015 |
| Windy House Limited | Caithness | 2006 |
| Windy Ridge VEG Limited | Downham Market | 2007 |
| Windyedge Equestrian Ltd | Motherwell | 2015 |
| Windyedge Green Limited | Huddersfield | 2021 |
| Windyedge Livery Ltd | Motherwell | 2015 |
| Windyridge Fishing Ltd | Peterhead | 2024 |
| Wine Marketing CRU Limited | Haywards Heath | 2011 |
| Winesandvines Limited | Sherborne | 2025 |
| Wineworth Limited | Andover | 2025 |
| Winfield Farms Limited | Woodbridge | 2013 |
| Winford Farm Fisheries Limited | Shanklin | 2022 |
| Winfrey Farms Limited | Oakham | 2017 |
| Wingate Road Allotments Association | Wirral | 2012 |
| Wingrove Racing Ltd | Bridgnorth | 2023 |
| Winklestone Vineyard Ltd | Uckfield | 2020 |
| Winkley Hall Farm Ltd | Blackburn | 2022 |
| Winks Grooming Ltd | Chelmsford | 2024 |
| Winley Hill Contractors Limited | Middlesbrough | 2023 |
| Winn-Darley Limited | York | 2012 |
| Winnall Down Farm Limited | Winchester | 1996 |
| Winnington Dairy Farms Limited | Stafford | 2002 |
| Winnington Wood Limited | Lytham St. Annes | 2026 |
| Winnow House Ltd | Stroud | 2024 |
| Winrow Limited | Bridgwater | 1997 |
| Winsbury Livestock Limited | Montgomery | 2009 |
| Winshaw Woofies Ltd | Swadlincote | 2024 |
| Winson Farms Limited | Cirencester | 1953 |
| Winson Woodcraft Ltd | Sonning | 2017 |
| Winsortan Limited | Chelmsford | 2024 |
| Winstar Food Holdings Limited | Kington, | 2014 |
| Winster Valley Game Limited | Windermere | 2024 |
| Winston Woods Ltd | Beccles | 2024 |
| Winstow Limited | Norwich | 2016 |
| Wintayre Equine Ltd | Glossop | 2026 |
| Winter Brothers Farmers Limited | Appleby-In-Westmorland | 1963 |
| Winter Close Limited | High Peak | 2023 |
| Winter Hill Farms Ltd | Barnsley | 2025 |
| Winter Park Holdings Limited | Hitchin | 2019 |
| Winterbeck Manor Stud Limited | Nottingham | 2000 |
| Winterbourne Folly Limited | Uckfield | 2022 |
| Winterbrook Garden Nurseries Limited | Wallingford | 2018 |
| Winterfields Farm Limited | Pulborough | 1995 |
| Winterfold Estate & Vineyard Limited | Godalming | 2017 |
| Winterfold Tree Services Limited | Cranleigh | 2000 |
| Wintergreen Groundcare Limited | Ellerker | 2002 |
| Winterquay Limited | Harrogate | 1996 |
| Winters Equestrian XC Training Ltd | Market Rasen | 2020 |
| Wintersett Fisheries Limited | Dewsbury | 2021 |
| Winterton Farm Marloes Limited | Southampton | 2021 |
| Winterton Farming Limited | Great Yarmouth | 2015 |
| Winterton Fencing Limited | Melton Mowbray | 2024 |
| Winterwell Farm Limited | Chippenham | 2012 |
| Winterwell Ltd | Chippenham | 2022 |
| Winterwood Farms Ltd | Maidstone | 2000 |
| Wintmoor Market Gardens Limited | Horncastle | 1948 |
| Winton Contractors Limited | Aboyne | 2021 |
| Wintons Fishery Limited | Burgess Hill | 2017 |
| Winview Fabrications Limited | Maidstone | 2004 |
| Winward Dairy Farming Limited | Malpas | 2016 |
| Winward Engineering Limited | Walsall | 1999 |
| Winzer Farming Ltd | Tiverton | 2026 |
| Winzor-Saile Ltd | Beccles | 2009 |
| Winzwood Ltd | Leicester | 2018 |
| Wirksworthlogs Ltd | Mansfield | 2017 |
| Wirral Branch Limited | Wirral | 2022 |
| Wirral Pet Nanny Limited | Wirral | 2011 |
| Wirral Tree Care Ltd. | Wirral | 2016 |
| Wirral Tree Services Limited | Penrith | 2014 |
| Wirral Tree Surgeons Limited | Penrith | 2014 |
| Wirral Turf Ltd | Liverpool | 2008 |
| Wisbech Contract Farming Ltd | Wisbech | 2003 |
| Wisbech Plant Company Limited | Wisbech | 1946 |
| Wise OWL Farm Ltd | Oswaldtwistle | 2025 |
| Wisefarm Ltd | Fraserburgh | 2021 |
| Wiseman Contracting Ltd | Dereham | 2013 |
| Wiseman Fishing Company Limited | Aberdeen | 1995 |
| Wiseton Limited | Doncaster | 2020 |
| Wishaw Abattoir Limited | Lanarkshire | 1976 |
| Wishforfish Ltd | Tintagel | 2021 |
| Wishsight Limited | Bury St. Edmunds | 1983 |
| Wisloe Farm Services Limited | Stonehouse | 2014 |
| Wispington Farms Limited | Sleaford | 1995 |
| Wispington Poultry Limited | Sleaford | 2025 |
| Wisteria (Eco) Ltd | Derby | 2021 |
| Wisteria Farm Ltd | Derby | 2025 |
| Wiston Farms Limited | Chichester | 1983 |
| Witcham Farm Limited | Manea | 2023 |