| Harmony Vineyard Ltd. | Shoreham-By-Sea | 2016 |
| Harnage Estates Limited | Liverpool | 1961 |
| Harnan Forestry Ltd | Melton Mowbray | 2025 |
| Harnett Agricultural Services Ltd | Aylesbury | 2025 |
| Harnham Hall Farming Limited | Hexham | 2022 |
| Harold B. Paynter Limited | Bedford | 1944 |
| Harold Davies & Partners Limited | Neston | 1960 |
| Harold Davies Holdings Limited | Neston | 2025 |
| Harold Jones (Farms) Limited | | 1951 |
| Harold Savage (Butchers) Limited | Mansfield | 1956 |
| Harold Savage (Farmers & Butchers) Limited | Mansfield | 1956 |
| Harold Sergeant and Sons Limited | Brough | 1963 |
| Harold W Smart & SON Limited | Glos | 1964 |
| Harolds Park Wildland Limited | Norwich | 2024 |
| Harome Trout Farm Limited | York | 2019 |
| Harp Contracting Ltd | Boston | 2017 |
| Harp Farm Limited | Wokingham | 1962 |
| Harper & Hunter Fishing Ltd | Brixham | 2025 |
| Harper & Wilkes Limited | Northallerton | 2011 |
| Harper 7 Ltd | Nelson | 2025 |
| Harper Contracts Insch Ltd. | Aberdeenshire | 2019 |
| Harper Seeds Ltd | Humbie | 2021 |
| Harper's Holdings Limited | Holsworthy | 2009 |
| Harperdean Landpower Limited | East Lothian | 1997 |
| Harperfoldstables Limited | Manchester | 2020 |
| Harperrig Fisheries Ltd. | West Lothian | 2005 |
| Harphall Poultry Ltd | Ballymena | 2015 |
| Harpswell Farms Limited | Gainsborough | 1977 |
| Harracott Farm Ltd | Torrington | 2003 |
| Harries Services Limited | Welshpool | 2018 |
| Harrimere Oaks Ltd | Ely | 2016 |
| Harrington Equine Sales Ltd | Dover | 2026 |
| Harrington Estates Driby Limited | Lincolnshire | 1997 |
| Harrington Farming Enterprises Limited | Spilsby | 2018 |
| Harrington Farms Limited | Northampton | 2004 |
| Harrington Hall Farms Limited | Lincolnshire | 1996 |
| Harrington Horticultural Holdings Ltd | Wisbech | 2025 |
| Harrington Nurseries Limited | Cambs | 2007 |
| Harrington Stud Limited | Ashford | 2025 |
| Harrington Woodfuel Co. Limited | Wythall | 2016 |
| Harris & Garrod (Holdings) Limited | East Yorkshire | 2019 |
| Harris & Garrod Limited | Grimsby | 1947 |
| Harris Arboriculture Ltd | Sittingbourne | 2023 |
| Harris Bulldogs Limited | Dewsbury | 2019 |
| Harris Endeavor Limited | Yarm | 2009 |
| Harris Equine Ltd | Hamilton | 2021 |
| Harris Farms Ltd | Blairgowrie | 2007 |
| Harris Smith Holdings Ltd | London | 2023 |
| Harris Tree Care Limited | Taunton | 2017 |
| Harris Venison & Co Limited | Towcester | 2016 |
| Harris Wilderness Mowing Ltd | Shrewsbury | 2024 |
| Harris's Highlanders Ltd | Glasgow | 2025 |
| Harrisagri Ltd | Helston | 2016 |
| Harrisburg Lake Forest Limited | Glasgow | 2007 |
| Harrison & Hetherington Limited | Carlisle | 1999 |
| Harrison Agricultural Contracting Limited | Ely | 2010 |
| Harrison Arboriculture Ltd. | Basingstoke | 2014 |
| Harrison Contract Services Ltd | Clitheroe | 2017 |
| Harrison Farming Limited | Richmond | 2025 |
| Harrison Farms (Kilham) Limited | Driffield | 2003 |
| Harrison Farms Limited | Rudgwick Horsham | 1995 |
| Harrison Farms Services (Kilham) Limited | Driffield | 2011 |
| Harrison Pups Ltd | Bournemouth | 2022 |
| Harrison Shellfish Limited | Pwllheli | 2003 |
| Harrison Tree Services (North West) Limited | Warrington | 2019 |
| Harrisons (Sykehead) | Carlisle | 2003 |
| Harrisons Tree Service Limited | Herts | 2009 |
| Harrison’S Livestock Limited | Scarborough | 2025 |
| Harrod Engineering Ltd | Great Addington | 2024 |
| Harrod Outdoors Limited | Great Yarmouth | 2020 |
| Harrogate Bespoke Pet Care Ltd | Harrogate | 2024 |
| Harrold Fruit Farming Limited | Cambridge | 2016 |
| Harrow & Plough Limited | Swadlincote | 2025 |
| Harrowden Farms Group Limited | Wellingborough | 2014 |
| Harrowden Farms Limited | Wellingborough | 1964 |
| Harrowden Turf Limited | Kettering | 2014 |
| Harry Blockley Limited | Bradford | 2026 |
| Harry Emslie Farmers Limited | Peterhead | 1977 |
| Harry Fairhead Limited | Loughton | 1936 |
| Harry Ferguson Farms Limited | Freshwater | 1954 |
| Harry FRY Racing Limited | Ilminster | 2013 |
| Harry Gibbs & Sons (Upper Bentley) Limited | Worcestershire | 1972 |
| Harry Harris Dipwcf Ltd | Axbridge | 2023 |
| Harry Horgan Eventing Ltd | Chesham | 2025 |
| Harry Horrell Limited | Peterborough | 1997 |
| Harry J White Ltd | Richmond | 2025 |
| Harry Kiddy Contracts Limited | Halstead | 2024 |
| Harry Masters Cider & Brandy Ltd | Stockbridge | 2018 |
| Harry Meade Limited | Chippenham | 2013 |
| Harry Parvin Agricultural Services Ltd | York | 2022 |
| Harry Ruffell & Co Limited | Suffolk | 1942 |
| Harry Smith Fishing Limited | Fraserburgh | 2015 |
| Harry Travis (Rishworth) Limited | Sowerby Bridge | 1983 |
| Harry Turner Family Limited | Chelmsford | 2010 |
| Harry Veall Limited | Staplehurst | 1959 |
| Harry W Chase Farming Ltd | Leominster | 2014 |
| Harry Wakefield Forestry Ltd | Melton Constable | 2021 |
| Harry Wood Livestock Ltd | Preston | 2023 |
| Hart Forestry Ltd | Bristol | 2018 |
| Hart LEE Tree Surgery Ltd | Canterbury | 2014 |