| Hart Services (Lincs) Ltd | Spalding | 2019 |
| Harter Land Limited | Alvescot | 2006 |
| Hartford Lake Fish Farm Limited | Baldock | 2015 |
| Hartford Tree Care Ltd | Northwich | 2024 |
| Hartham Sporting Ltd | Corsham | 2026 |
| Harthill Farming Limited | Rossendale | 2025 |
| Hartisford Farming & Forrestry Ltd | Lanark | 2015 |
| Hartland Stock Limited | Sudbury | 2021 |
| Hartlepool Fish Co. Limited | Hartlepool | 1996 |
| Hartley Brothers Ltd | Louth | 2025 |
| Hartley Farm Limited | Wisbech | 2023 |
| Hartley Farming (Yorkshire) Limited | York | 2017 |
| Hartley Main Farms Limited | Morpeth | 1953 |
| Hartley Park Farms Limited | Alton | 1987 |
| Hartley Park Group Limited | Alton | 2026 |
| Hartley Park Land (Holdings) Limited | Alton | 2026 |
| Hartley's Dairy Limited | Bashall Eaves | 2025 |
| Hartleys (SW) Ltd | Newton Abbot | 2018 |
| Harts & Hounds Ltd | Aylesbury | 2019 |
| Harts Community Adventure CIC | Birmingham | 2021 |
| Harts Deer Management Ltd | London | 2025 |
| Hartwood Logging Ltd | Selkirk | 2012 |
| Hartwood Timberworks Ltd | Ottery St. Mary | 2010 |
| Hartwood Wild Crafts Ltd | Dailly | 2024 |
| Hartwright Estates Limited | Worcestershire | 1997 |
| Harveni Farm Limited | Crewe | 2025 |
| Harvest Fishing Company Limited | Peterhead | 1999 |
| Harvest for ALL Community Interest Company | Coventry | 2024 |
| Harvest Home Limited | Northallerton | 2009 |
| Harvest Horizon Farm Ltd | Stoke-On-Trent | 2025 |
| Harvest Hues Limited | London | 2023 |
| Harvest Reaper Ltd | Tarbert | 2004 |
| Harvest Renewable Energy Limited | Horncastle | 2004 |
| Harvest Wood Products Ltd | Tilford Farnham | 1985 |
| Harvestaire Ltd | Camborne | 2025 |
| Harvester Chain Sharpening Ltd | Penrith | 2022 |
| Harvester Fishing (Brixham) Limited | Torquay | 2024 |
| Harvester Fruits & Vegetables Prep Ltd | London | 2025 |
| Harvesthawk Agrisystem Ltd | Exeter | 2025 |
| Harvesting OUR Country Ltd | London | 2022 |
| Harvesting Solutions Ltd | Whitland | 2019 |
| Harvey Agricultural Services and Construction Ltd | Kingsbridge | 2004 |
| Harvey Farming Company Limited | Cambridge | 1996 |
| Harvey Farms (Winterbourne) Limited | Salisbury | 2001 |
| Harvey Farms Limited | Burton On Trent | 1996 |
| Harvey Fishing Ltd | Marazion | 2017 |
| Harvey Lloyd Fisheries Limited | Bristol | 2013 |
| Harvey Tree Services Ltd | Stoke-On-Trent | 2022 |
| Harveyson Forestry Limited | Plymouth | 2013 |
| Harviestoun Farming Company Limited | Dollar | 1996 |
| Harwes Farm CIC | Colne | 2014 |
| Harwich Farms Limited | Stansted | 2020 |
| Harwood Import/Export Limited | Boston | 1994 |
| Harwoods (Battisford) Limited | Stowmarket | 1958 |
| Harworth Estates Northumberland Woodland Limited | Rotherham | 2023 |
| Hasad AL Dhahab Ltd | London | 2026 |
| Hascombe & Valiant Stud Limited | Newmarket | 2015 |
| Haskett Ltd | Harlow | 2000 |
| Haslemere Farm (Traditional Breeds) Limited | Ipswich | 2004 |
| Hasmad Global Limited | London | 2023 |
| Hasnain & Hasnain Trader Ltd | London | 2026 |
| Hasse Estate Farming Company Limited | Newmarket | 1997 |
| Hassles Limited(The) | Tonbridge | 1985 |
| Hastings Fishmarket Enterprises Limited | East Sussex | 1989 |
| Haswell Moor Farms Ltd | Co. Durham | 2003 |
| Hatch & Harvest Ltd | Hastings | 2025 |
| Hatchblu Ltd | London | 2026 |
| Hatchlands Farm Limited | Totnes | 2025 |
| Hatem Trading Limited | Ilford | 2020 |
| Hatfield Farms Limited | London | 1977 |
| Hatford Enterprises Ltd | Faringdon | 2008 |
| Hathersage and Outseats Allotment Group | Hope Valley | 2010 |
| Hatley Park Farms Limited | Sandy | 1973 |
| Hats and Barrels Charter Company Limited | Mountain Ash | 2025 |
| Hattchar Agri Limited | York | 2014 |
| Hattens Farm Estates Limited | Norfolk | 2012 |
| Hatton Country Store Ltd | Bishopton | 2022 |
| Hatton Estate Turriff Ltd | Turriff | 2018 |
| Hatton Farms Limited | Coventry | 1986 |
| Hatton Holdings Limited | Sherborne | 2015 |
| Hattrick Farms Limited | Lochwinnoch | 2013 |
| Haughey Farming Limited | Lisburn | 2023 |
| Haughey Farms Ltd | Omagh | 2018 |
| Haughhead Farm Limited | Hamilton | 1992 |
| Haughton Honey Limited | Cardiff | 2003 |
| Haulkerton Farms Limited | Laurencekirk | 1997 |
| Haus of Sausage Ltd | Hull | 2026 |
| Hausehead Ltd | London | 2015 |
| Hautbois Trading Company Limited(The) | Yeovil | 1960 |
| Hauxdale Ltd | Carlisle | 2025 |
| Hauxley Farm Limited | Stockton-On-Tees | 2025 |
| Hauxley Poultry Limited | Stockton-On-Tees | 2024 |
| Havacre Bloodstock Limited | Ely | 2025 |
| Haven Clinical Psychology Practice Ltd | Holsworthy | 2014 |
| Haven Dog Rescue CIC | London | 2025 |
| Haven Fayre Ltd | Horsham | 2026 |
| Haven Herefords | Hereford | 1958 |
| Haven Hill Shoot Limited | Stoke On Trent | 2002 |
| Haven LEA Farms Limited | Wigan | 2015 |
| Havensfield Farm Limited | Woodbridge | 2022 |