| Wulfric Aarne Racing Ltd | Norwich | 2024 |
| WV Fishing Lakes Ltd | Slough | 2024 |
| WV Logs Local Ltd | Keighley | 2025 |
| WW Fishing Ltd | Fraserburgh | 2025 |
| Wwcc Limited | Chelmsford | 2000 |
| WWL12 Ltd | London | 2020 |
| Wyau Evans Eggs Ltd | Ystrad Meurig | 2026 |
| Wyau Llainwen Eggs CYF | Ruthin | 2026 |
| Wyau Llŷn Eggs CYF | St. Asaph | 2025 |
| Wychling Agricultural Limited | Hailsham | 2003 |
| Wychnor Trees Limited | Tamworth | 2002 |
| Wychwood Arboriculture Ltd | Chipping Norton | 2025 |
| Wychwood Rescue Ltd | Lilleshall | 2025 |
| Wyck Livestock Limited | Newmarket | 1982 |
| Wyddial Hall Farms Ltd | Buntingford | 2020 |
| Wydra Farmers Limited | Harrogate | 2003 |
| WYE Agricultural Limited | Benenden | 2008 |
| WYE Coppice CIC | Coleford | 2021 |
| WYE Fishing Ltd | Kington | 2022 |
| WYE Hops Limited | Kent | 1996 |
| WYE Valley Flowers Ltd | Lydney | 2008 |
| WYE Valley Forestry Limited | Cardiff | 2021 |
| WYE Valley Wines Limited | Ross-On-Wye | 2023 |
| WYE Valley Woodlands Ltd | Chepstow | 2009 |
| WYE Willows Ltd | Ruardean | 2021 |
| Wyecarr Canine Limited | Driffield | 2021 |
| Wyelands Estates Limited | Lydney | 1976 |
| Wyes Cats & Dogs Limited | Chepstow | 2018 |
| Wyevale Container Plants Limited | Hereford | 1996 |
| Wyevale Hawkins Limited | Hereford | 1973 |
| Wyevale Transplants (Forestry) Limited | Hereford | 1987 |
| Wyevale Trees Limited | | 1990 |
| Wyfold Vineyard Limited | Henley On Thames | 2014 |
| Wykeham Farms Limited | Scarborough | 1954 |
| Wykeham Fields Farm Limited | Banbury | 2020 |
| Wykeham Trees Limited | Scarborough | 1981 |
| Wykham Park Farm Limited | Banbury | 2019 |
| Wyld LEA Company Limited | Glastonbury | 2015 |
| Wylder Estate Limited | Abingdon | 2023 |
| Wyldewood Tree and Garden Ltd | Southampton | 2019 |
| Wyldherbs (SLU) Limited | London | 2024 |
| Wyldlands Ltd | Bridport | 2019 |
| Wylie Livestock Ltd | Newtownabbey | 2022 |
| Wylye Valley Farming Limited | London | 1947 |
| Wylye Valley Limited | Warminster | 2008 |
| Wymondham Garden Centre Ltd | Norwich | 2005 |
| Wymondham Woodland and Ways CIC | Melton Mowbray | 2025 |
| WYN Wood Limited | Swansea | 2005 |
| Wyndford Wagyu Ltd | Newport | 2021 |
| Wynford Farm Limited | Glasgow | 2023 |
| Wynn Farming Limited | Thame | 2017 |
| Wynnstay Farming Company Limited | St. Asaph | 1995 |
| Wynnstay Fishing & Conservation Limited | Sandbach | 2006 |
| Wyrd Botanica Ltd | Teignmouth | 2025 |
| Wyre Forest Aquaculture Limited | Wolverhampton | 2014 |
| Wyre Forest Pest Control Ltd | Kidderminster | 2012 |
| Wyresdale Anglers Club Ltd | Preston | 2022 |
| Wyreside Mushrooms Ltd | Lancaster | 2022 |
| Wyrley Farms Limited | Staffordshire | 1993 |
| Wythywyndle Apiary Ltd | Pencader | 2018 |
| Wyvern Farm Limited | Bury St Edmunds | 2013 |
| Wyvis Tree Services Ltd | Inverness | 2018 |
| Wyvols Court Farm Limited | Reading | 2008 |
| X Angling Ltd | Norfolk | 2018 |
| X-Kiwi Marketing Limited | Berwick Upon Tweed | 1998 |
| Xale Limited | Walton-On-Thames | 2022 |
| Xamituk Global Resources UK Ltd | London | 2020 |
| Xanadu Farms Ltd | Enniskillen | 2021 |
| Xanadu Stud Ltd | Robertsbridge | 2018 |
| Xcavateagri Ltd | Chorley | 2025 |
| Xcelbio Ltd | Glastonbury | 2018 |
| Xcell Dogs Limited | Newmarket | 2020 |
| Xecureme Limited | Edinburgh | 2019 |
| Xenophon's Horse Limited | Virginia Water | 2022 |
| Xiankai Technology Co., Limited | Cardiff | 2021 |
| XIN Wang Food Ltd | Glasgow | 2024 |
| Xing Signature Ltd | Manchester | 2022 |
| Xinlifeng Biotechnology Limited | Beckenham | 2024 |
| Xinzo Limited | Devon | 2003 |
| XL Asset Management Limited | Market Harborough | 2008 |
| XL Horticulture Limited | Ottery St Mary | 2005 |
| XMT Cellini Co Limited | London | 2026 |
| Xpel Environmental Services Limited | Cannock | 2006 |
| Xpertz Ltd. | London | 2023 |
| Xpressplus Limited | London | 1998 |
| Xseed Farms Limited | London | 2024 |
| Xtralarge Global Agritourism Ltd | Croydon | 2025 |
| Xylem Global | Dorking | 2020 |
| XYQ Management Limited | London | 2021 |
| Y Delves Limited | Grimsby | 2022 |
| Y H Stabling Limited | Carlisle | 2024 |
| Y-Fishing Limited | Marazion | 2019 |
| Y.M.S Group Ltd | Leeds | 2026 |
| Y.T.L Limited | Wakefield | 2005 |
| Y20 Ltd | Lockerbie | 2020 |
| Yair Estates 2009 Limited | Galashiels | 2009 |
| Yaldham Woodland Management Ltd | Sevenoaks | 2022 |
| Yallo Limited | Standish | 2022 |
| Yamato (China) Co., Ltd | London | 2019 |
| Yana Alpacas Ltd | Ripley | 2017 |