| Havensfield Pigs Limited | Hoxne | 2006 |
| Havering Park Farm Limited | Collier Row Romford | 2000 |
| Havlin Bloodstock Limited | Newmarket | 2019 |
| HAW Farm Limited | Stourport-On-Severn | 2017 |
| Hawarden Happy Hounds Limited | Deeside | 2023 |
| Hawes Arborists Limited | Shaftesbury | 1997 |
| Hawes Forestry Ltd | Annan | 2021 |
| Hawk Experience Limited | Horton In Ribblesdale | 2003 |
| Hawk Farming Limited | Stirling | 1996 |
| Hawker Dairy Limited | Chippenham | 2026 |
| Hawkes Farms Limited | Spilsby | 1959 |
| Hawkes Limited | Spilsby | 1959 |
| Hawkesmill Nurseries Co. Limited | Coventry | 1977 |
| Hawkeye Pest Control Ltd | Newbury | 2005 |
| Hawkfibre Limited | London | 1986 |
| Hawking Farming Limited | Chippenham | 2015 |
| Hawkins Farm and Plant Ltd | Horsham | 2019 |
| Hawkins Farming Limited | Herefordshire | 1977 |
| Hawkins Forestry Limited | Bury St. Edmunds | 2018 |
| Hawkridge Wood Farm Limited | Newbury | 2010 |
| Hawksbury Hunt Ltd | Saffron Walden | 2019 |
| Hawksdrift Limited | Abergavenny | 2011 |
| Hawksfold Ltd | Sheffield | 2026 |
| Hawksmead Parks Limited | Skegness | 2025 |
| Hawkspare Farming Limited | Dartford | 2011 |
| Hawksridge Ltd | Wadebridge | 2025 |
| Hawkwell Orchard Limited | Tunbridge Wells | 2022 |
| Hawridge Farms Limited | Chesham | 2023 |
| Hawthbush Farm Ltd | Heathfield | 2020 |
| Hawthorn & Grove Farm Ltd | Wellingborough | 2023 |
| Hawthorn & Hornbeam Limited | Luton | 2019 |
| Hawthorn Alpaca's Ltd | Harrogate | 2003 |
| Hawthorn Farming Limited | Sandbach | 2020 |
| Hawthorn Fishing Ltd | Fraserburgh | 2018 |
| Hawthorn Green Ltd | London | 2023 |
| Hawthorn Heights Farms Ltd | Londonderry | 2015 |
| Hawthorn Hill Estate Limited | Downpatrick | 2025 |
| Hawthorn Hill Farm Ltd | Newry | 2017 |
| Hawthorn Hill Ltd | Crumlin | 2024 |
| Hawthorn Landscaping and Groundwork Ltd | Bristol | 2013 |
| Hawthorn Shellfish Ltd | Shetland | 2025 |
| Hawthornbank Limited | Edinburgh | 1989 |
| Haxby Fishing Ltd | Driffield | 2016 |
| Haxted Farm Limited | Lingfield | 2023 |
| HAY & Astley Ltd | Uttoxeter | 2019 |
| HAY Bale Farm Ltd | London | 2026 |
| HAY Farm Ltd. | Peterhead | 2002 |
| HAY Farming Contractors Ltd | Peterhead | 2018 |
| HAY Farming Limited | Spalding | 1982 |
| HAY Fell Limited | Penrith | 2018 |
| HAY Spoon & Honey Ltd | Nottingham | 2025 |
| HAY Wood (Ross-On-Wye) Limited | Ross-On-Wye | 2024 |
| Haybrake Farms Limited | Aberdeen | 1999 |
| Haybridge Stud Ltd | Banbury | 2021 |
| Haybrook Farm Limited | Alcester | 2016 |
| Haycombe Farm Livery Ltd | Camelford | 2024 |
| Haycroft Farms Limited | Gerrards Cross | 1995 |
| Hayday Land Management Ltd | Llanfyrnach | 2025 |
| Hayden's Arboricultural Consultants Limited | Bury St Edmunds | 2010 |
| Haydn Wesley & SON Ltd | Lincs | 2005 |
| Haydon House Poultry Limited | Taunton | 2020 |
| Haye Farm Market Garden Ltd | Bewdley | 2023 |
| Hayes Bank Herd Limited | Malvern | 2014 |
| Hayes Bivvy Heaters Ltd | Chorley | 2024 |
| Hayes Farms | Dungannon | 2008 |
| Hayes Forestry Limited | Denmead | 2003 |
| Hayes Grange Farm Ltd | Horsham | 2020 |
| Hayfields Dog Hotel Limited | Daventry | 2012 |
| Haygrove Limited | Herefordshire | 1996 |
| Haygrove Plants Limited | Ledbury | 2018 |
| Haylands Stud Ltd | Gloucester | 2013 |
| Hayles Fruit Farm Limited | Cheltenham | 1938 |
| Hayley Burton Racing Ltd | Newmarket | 2026 |
| Hayley Dog Care Ltd | Bonnyrigg | 2026 |
| Hayley Hoy-Durant Limited | Blackpool | 2016 |
| Hayley's Walkies Ltd | Bedford | 2021 |
| Hayling Island Donkey Sanctuary CIC | Waterlooville | 2023 |
| Hayling Island Scallops Ltd | Portsmouth | 2023 |
| Hayllar Farms | Cumbria | 2006 |
| Haylock Mushrooms Limited | Lowestoft | 2016 |
| Hayman Norton Limited | Pembrokeshire | 2001 |
| Haymarket Agri Plant Ltd | Sudbury | 2024 |
| Haymeadow Limited | Enniskillen | 2009 |
| Haynes Contracting Limited | Kidlington | 2009 |
| Haynes Meadow Limited | Southam | 2022 |
| Haynes Training Limited | Cambridge | 2009 |
| Hayrack Livestock Ltd | Chester | 2022 |
| Hayrick Limited | Benenden | 1998 |
| Hayrish Limited | Camberley | 1994 |
| Hayward & Partners Limited | London | 2025 |
| Hayward Agricultural Holdings Limited | Leamington Spa | 2019 |
| Hayward's Mowing Limited | Pinner | 2004 |
| Hazard Contracting Limited | Melton Mowbray | 2011 |
| Hazco (Banff) Ltd | Fraserburgh | 2023 |
| Hazdog Ltd | Market Rasen | 2026 |
| Hazel Farms Limited | Tiverton | 2015 |
| Hazelbank Enterprises Limited | Strabane | 2007 |
| Hazelburn Poultry Limited | Omagh | 2010 |
| Hazelden Limited | Kilmarnock | 1992 |
| Hazeldine Ground Care Ltd | Runcorn | 2020 |