| Happy Hounds Carrickfergus Ltd | Carrickfergus | 2020 |
| Happy Hounds Daycare Exeter Ltd | Exeter | 2022 |
| Happy Hounds Glasgow Ltd | Glasgow | 2019 |
| Happy Hounds Holidays Limited | Slough | 2021 |
| Happy Hounds Huddersfield Ltd | Wakefield | 2023 |
| Happy Life Together NI CIC | Belfast | 2023 |
| Happy Meadows Ltd | Norwich | 2025 |
| Happy Paws Day Care Centre Ltd | Halifax | 2020 |
| Happy Pigs Consultancy Limited | Market Drayton | 2014 |
| Happy Rabbit Limited | Yeovil | 2003 |
| Happy Salmon Company Ltd | Newtongrange | 2026 |
| Happy Shrimp House HSH Ltd | Liverpool | 2026 |
| Happy Tails Home Stay Ltd | Bury St. Edmunds | 2024 |
| Happy Tails RC Limited | Sunderland | 2025 |
| Happy Valley Honey Limited | Macclesfield | 2018 |
| Happyard Ltd | Dorchester | 2020 |
| Happycaps Mushroom Farm Ltd | Cheltenham | 2024 |
| Happytayls Ltd | South Shields | 2023 |
| Hapsford Limited | Bristol | 1989 |
| Harambee Mews Ltd | Liphook | 2023 |
| Harbottle Castle Estate Company | Morpeth | 1947 |
| Harbour Ranch Ltd | Woodmancote | 2018 |
| Harbour Tree Care Services Ltd | Loughborough | 2014 |
| Harbourne Vineyard Ltd | Sittingbourne | 2024 |
| Harbourside Flowers Ltd | Hayling Island | 2024 |
| Harbourview Engineering Limited | Newry | 2012 |
| Harcamlow Biomass Limited | Huntingdon | 2025 |
| Harcarse Hill Farm Ltd | Duns | 2024 |
| Harcourt Hemp Limited | Weybridge | 2021 |
| Harcus Fishing Company Limited | St. Ola | 1996 |
| Hardcastle Renewables Limited | Goole | 2013 |
| Hardcastle Ventacrop ( 2000 ) Limited | Driffield | 2007 |
| Hardee-Kerr Limited | Cambridge | 2015 |
| Hardgain Limited | Carnforth | 2016 |
| Hardgrave Farm, (Dumfries) Limited | Dumfries | 1954 |
| Hardgrove Farms Ltd | Dumfries | 2025 |
| Hardham Farming Limited | Axminster | 2013 |
| Hardham Horses Limited | London | 2025 |
| Hardhaugh Farming and Plant Ltd | Keith | 2021 |
| Hardie Services Ltd | Forfar | 2026 |
| Hardiman Fake Farming Limited | Downham Market | 2019 |
| Hardingham Farms Limited | Norwich | 1964 |
| Hardmet Landforce Limited | Dorchester | 2009 |
| Hardnaze Farm Estate Ltd | Keighley | 2025 |
| Hardstaff Linby Unlimited | Nottingham | 2011 |
| Hardwell Forestry Ltd | Blackburn | 2026 |
| Hardwick Agriculture Limited | Newark | 2024 |
| Hardwick Contracting Limited | Chepstow | 2024 |
| Hardwick Farming Company Limited | Cambridge | 2023 |
| Hardwick Hall Estate Limited | Ellesmere | 2015 |
| Hardwick Hall Farm Ltd | Doncaster | 2012 |
| Hardwick Ventures Limited | Bridlington | 2008 |
| Hardwood Logs & Supplies Ltd | Matlock | 2025 |
| Hardy Agronomy Ltd | Swaffham | 2023 |
| Hardy Paul Limited | Heathfield | 2015 |
| Hardy Tree Surgeons Limited | Dorchester | 2002 |
| Hardy Woodland Services Limited | Chippenham | 2017 |
| Hardys Farm Limited | Skegness | 2015 |
| Hare Hatch Sheeplands Limited | Bognor Regis | 2017 |
| Harefield Farming Ltd | Maidenhead | 2021 |
| Harefields Smallholders Limited | Lichfield | 2026 |
| Harefold Limited | London | 1985 |
| Harehill Alpacas Ltd | Ballynahinch | 2022 |
| Harehill Farms Limited | Ashbourne | 2009 |
| Harehope Farms Limited | Alnwick | 1969 |
| Harehope Quarry Project Limited | Bishop Auckland | 1999 |
| Harelands Limited | Bruton | 2026 |
| Harelaw Trout Fishery Ltd | Ayr | 2021 |
| Harepie Ltd | Barnstaple | 2024 |
| Hares Contracting Ltd | Bristol | 2023 |
| Hares Forestry Ltd | Broadway | 2017 |
| Harestone Moss Farms Ltd | Aberdeen | 2018 |
| Harewood END Growers Limited | Hereford | 1999 |
| Harewood Farming Company Limited (the) | Leeds | 1973 |
| Harewood Hill Limited | Harrogate | 1982 |
| Harewood Livery Limited | Shipley | 2026 |
| Harford Marine Ltd | Helston | 2024 |
| Harford Renewables Ltd | Amersham | 2018 |
| Hargitai-Aranykalasz Limited | Tarleton Preston | 2023 |
| Hargoose Beauly Ltd | Bakewell | 2025 |
| Hargrave Farming Limited | Huntingdon | 1996 |
| Hargreaves Dairies Limited | Lybster | 2025 |
| Hargreaves Farming Co Limited | Lybster | 2020 |
| Harir House Ltd | Manchester | 2025 |
| Harkness New Roses Limited | Herts | 1967 |
| Harkness Roses (UK Sales) Ltd | Biggleswade | 2022 |
| Harlands Holdings 2026 Limited | Bridlington | 2025 |
| Harlaston (Packington) Limited | Burton-On-Trent | 2011 |
| Harley Farms (Wilts) Limited | Chippenham | 2007 |
| Harling Spraying Services Limited | Norwich | 2025 |
| Harling Wood Stud Ltd | Thetford | 2024 |
| Harlton Farms Limited | Cambridge | 1963 |
| Harmer Farms Limited | Norwich | 2009 |
| Harmin Agriculture Limited | Chester | 2023 |
| Harmonia Herbals Limited | Chepstow | 2024 |
| Harmony 777 Ltd | Sturmore | 2013 |
| Harmony Fields Limited | Cowdenbeath | 2018 |
| Harmony Garden CIC | Waltham Cross | 2025 |
| Harmony Halal Farm Ltd | Pontypool | 2024 |
| Harmony Stables C.I.C. | Buckley | 2023 |