| Long Shot Stables Ltd | Pershore | 2019 |
| Long Stratton Pigs Limited | Diss | 2017 |
| Long-Life Nutrition Ltd | Preston | 2021 |
| Longacre Tree Surgery Ltd | Hertford | 2018 |
| Longagra Limited | Carnforth | 2005 |
| Longbridge (Sussex) Limited | Lewes | 2021 |
| Longcroft Agriculture Ltd | Bury St Edmunds | 2021 |
| Longdole Farm Ltd | Bristol | 2020 |
| Longdole Limited | Stanstead Abbotts | 2017 |
| Longdon Stud Limited | Lichfield | 1964 |
| Longdown Activity Farm Limited | Southampton | 2004 |
| Longedge Farm Limited | Burnhope | 2017 |
| Longfield Farm (Plant and Agriculture) Limited | Barrow-Upon-Humber | 2021 |
| Longfield Farm Ltd | Dungannon | 2016 |
| Longfield Tree & Hedge Care Limited | Fleckney | 2015 |
| Longfield Wood Ltd | London | 2011 |
| Longfold Farm Limited | Preston | 2022 |
| Longford Farms Limited | Salisbury | 1951 |
| Longford Investment Limited | Swansea | 2006 |
| Longfurrow Farm (Evesham) Ltd | Evesham | 2012 |
| Longhalves Stud Ltd | Lewes | 2022 |
| Longham Farm Enterprises Limited | Rugby | 2019 |
| Longhay Limited | Hertfordshire | 2003 |
| Longholes Equine Therapy Centre Ltd | London | 2021 |
| Longholes Farm Ltd | Newmarket | 2021 |
| Longhorn Farm Limited | Luton | 2021 |
| Longhouse Enterprises Limited | Pembroke | 2023 |
| Longlakes Equestrian LLE Ltd | London | 2023 |
| Longland Farm Ltd | Canterbury | 2016 |
| Longloch Farm Ltd | Fife | 2005 |
| Longloch Farming Ltd | Fife | 1992 |
| Longmead Developments Limited | Henley-In-Arden | 1995 |
| Longmoor Farm Limited | Taunton | 2014 |
| Longmynd Farms Limited | Shropshire | 1973 |
| Longner Bloodstock Limited | Shrewsbury | 2021 |
| Longney Manor Equestrian Ltd | Gloucester | 2026 |
| Longrove Farms Limited | Cambridge | 2018 |
| Longthorns Farm Limited | Wareham | 2010 |
| Longthorp (Kilpin) Limited | Goole | 1955 |
| Longton Sheepdogs Limited | | 2005 |
| Longview Properties Ltd | Lampeter | 2000 |
| Longview Stud & Bloodstock Ltd | Watford | 1981 |
| Longwaite Ltd | Bath | 2020 |
| Longwood Farm Limited | Henley On Thames | 2021 |
| Longwood Game Farm Limited | Winchester | 2013 |
| Longwood Life CIC | Newton Abbot | 2026 |
| Longwood Organic Farmers Limited | Bury St. Edmunds | 1964 |
| Longwoods Livestock Limited | Shepton Mallet | 2026 |
| Longxiao Trading Co., Ltd | Manchester | 2021 |
| Looe Valley Vineyard Limited | Cornwall | 2006 |
| Looking Glass Exotics UK Ltd | Campbeltown | 2020 |
| Lookmaster Limited | Leicestershire | 1988 |
| Loombest Limited | Halesworth | 2006 |
| Loomport Sourcing U.K Ltd | Macclesfield | 2025 |
| Loopy Agri & Plant Services Limited | Leyland | 2022 |
| Loose Birds (Harome) Ltd. | York | 2000 |
| Loose Hall Farm Limited | Ipswich | 1953 |
| Loose Reins (Dorset) Limited | Poole | 2020 |
| Loose Reins Breeding Co Limited | Poole | 2024 |
| LOP Farm Ltd | Sheffield | 2016 |
| LOR York Limited | Leeds | 2017 |
| Loranthus Fishing Company Limited | Buckie | 2006 |
| Loraxe Arboricultural Consultancy Ltd | Worcester | 2026 |
| Lord Greenwich Ltd | London | 2021 |
| Lord of the Trees Ltd | Dunbar | 2018 |
| Lord Petre's Farms Limited | Essex | 1954 |
| Lord Rayleigh's Farms Limited | Chelmsford | 1930 |
| Lords Fields Farms Limited | Suffolk | 1948 |
| Lordship Stud Limited | Newmarket | 1997 |
| Lorek & Sons Tree Services Ltd | Burton-On-Trent | 2025 |
| Loretta Fishing Limited | Milford Haven | 2003 |
| Lorica Trust Limited | Pulborough | 1997 |
| Lormor Limited | Glasgow | 1943 |
| Lorn Logging Limited | Glasgow | 2017 |
| Lorna Goodall Limited | Knutsford | 2025 |
| Lorraine Laird Ltd | Lisburn | 2023 |
| Lorton Vale Farms Limited | Cockermouth | 2013 |
| Losiradream Limited | Ayr | 2019 |
| Lossett Developments Limited | Belfast | 1978 |
| Lost Dog Recovery UK South CIC | Burgess Hill | 2019 |
| Lost Lake FLY Ltd | Basingstoke | 2020 |
| Lost Paws Dog Rescue & Rehoming CIC | Derby | 2021 |
| Lost Peacock Ltd | Mayfield | 2023 |
| Lostock and Chew Moor Community Orchard CIC | Bolton | 2026 |
| Lostock Tackle Ltd | Preston | 2016 |
| Lotherton Estates Limited | Leeds | 2005 |
| Lothian Pure Bees Ltd | Bathgate | 2020 |
| Loton Surveys Ltd | Shrewsbury | 2016 |
| Lottie Crane Limited | Malton | 2020 |
| Lottie Crocker Horses & Tack Shop Limited | Crowthorne | 2018 |
| Lottie Walsh Equine Therapy Limited | Lancaster | 2024 |
| Lottisham Church Farm Limited | Yeovil | 2020 |
| Lottisham Farms Holdings Limited | Yeovil | 2020 |
| Lottisham Farms Limited | Yeovil | 1960 |
| Lotus Flower Foods Ltd | Croydon | 2016 |
| Lotus Lamb and Animals Sanctuary Limited | Pulborough | 2025 |
| Louch & Ferrari Limited | Henstridge | 2013 |
| Loudham Estates (Suffolk) Limited | Salisbury | 1965 |
| Lough Erne Investments Limited | Lisnaskea | 2012 |
| Lough Foyle Fishing Company Limited | Londonderry | 2014 |