| Leestlin Trawlers Limited | Newry | 2010 |
| Leet Hill Farm Limited | Halesworth | 2015 |
| Leeway Farm Services Ltd | Haywards Heath | 2020 |
| Lefkara Land Corporation Ltd | Chigwell | 2013 |
| Left Field Agriculture Ltd | Taunton | 2025 |
| Leftfield Urban Limited | Aberdeen | 2020 |
| Legacy Equine Rehabilitation Centre Ltd | Derby | 2023 |
| Legacy Gardens Ltd | Chorley | 2024 |
| Legacy Resorts Limited | Birmingham | 2013 |
| Legars Limited | Kelso | 2013 |
| Legaston Farming Company Limited | Arbroath | 1997 |
| Legavallon Investments Limited | Dungiven | 2004 |
| Legend Land Limited | Callington | 2014 |
| Leger Lakes Ltd | Sheffield | 2021 |
| Legerwood Investments Limited | Earlston | 2013 |
| Leggat Farming Limited | Maidstone | 2019 |
| Leggate Leisure Ltd | Lincoln | 2017 |
| Legge Farm Ltd | Beaworthy | 2021 |
| Leggett Straw Ltd | Ipswich | 2012 |
| Leggett's Farm Limited | Beccles | 1943 |
| Leggott Farming Limited | Doncaster | 2008 |
| Leggs Farm Ltd | Speldhurst | 2020 |
| Leggygowan Eggs Limited | Ballynahinch | 2021 |
| Legmore Farms Ltd | Craigavon | 2009 |
| Legnabrocky Farms Ltd | Enniskillen | 2011 |
| Legnegoppack Farms Limited | Downpatrick | 2014 |
| Legrys Havelock Estates Ltd. | Edenbridge | 2012 |
| Leia and Friends Dog Boarding Ltd | Doncaster | 2025 |
| Leicester Tree Surgeon Ltd | Leicester | 2019 |
| Leicestershire and Rutland Farriery Ltd | Melton Mowbray | 2023 |
| Leicestershire Tree Care Ltd | Leicester | 2019 |
| Leicestershire Tree Surgeon Ltd | Leicester | 2019 |
| Leichefurde Equestrian Livery Ltd | Lanark | 2025 |
| Leiff Côte D’Ivoire Limited | London | 2023 |
| Leiff Natural Capital Solutions Ltd | London | 2021 |
| Leiff Partners Limited | London | 2024 |
| Leiff Romania Limited | London | 2024 |
| Leigh Court Farm Limited | Bristol | 2002 |
| Leigh Farm Limited | Eastleigh | 2015 |
| Leigh Farming Ltd | Dulverton | 2018 |
| Leigh Land Limited | Sherborne | 2006 |
| Leigh Mowat Ltd | St Margaret'S Hope | 2013 |
| Leigh Puppies Limited | Oswestry | 2021 |
| Leigh Sinton Farm & Nurseries Limited | Nr Malvern | 1956 |
| Leigh's Bees Limited | King'S Lynn | 2018 |
| Leigh's Forestry & Firewood Ltd | Woodbridge | 2013 |
| Leighmar Ltd | Fraserburgh | 2016 |
| Leighton Farms Limited | Welshpool | 2024 |
| Leitrim Farms Limited | London | 2019 |
| Leitrim Livestock Ltd | Newry | 2023 |
| Lelance Dairy Ltd | Orpington | 2026 |
| Lello Bros. Limited | Camborne | 1945 |
| LEM Sporting Ltd | Leeds | 2020 |
| Lembell Limited | Binsted | 1990 |
| Lemhill Farms Limited | Oxford | 1996 |
| Lemken Nurseries Limited | Ormskirk | 2001 |
| Lemp Services Ltd | Telford | 2021 |
| Lemsford Smallholding Ltd | Pinner | 2023 |
| Lemy Pharma Ltd | London | 2025 |
| LEN Wright Ltd. | Preston | 1993 |
| LEN Wright Salads Ltd | Preston | 2008 |
| Lenaghan Farms Limited | Enniskillen | 1978 |
| Lendstand Enterprises Limited | Manchester | 1994 |
| Lenger Seafoods Ireland Ltd | Kilkeel | 2007 |
| Lennon Equine Ltd | Newtownards | 2018 |
| Lennon Farms Ltd | Armagh | 2026 |
| Lennon Livestock Ltd | Newry | 2014 |
| Lennoxwoods Limited | Edinburgh | 1994 |
| Lenny Agrimedico Services Ltd | Brecon | 2016 |
| Lenor Limited | Downpatrick | 2012 |
| Lens Orchard Logs Ltd | Bridgnorth | 2024 |
| Lenton Brothers,Limited | Hunts | 1947 |
| LEO Pest Control Environment Services Limited | Herefordshire | 2007 |
| Leon Brown Arb-Agri Contracting Ltd | Bury St Edmunds | 2022 |
| Leon Farms Limited | London | 2014 |
| Leonard Towler & Company Limited | Norfolk | 1952 |
| Leonard William Mackie Trading Limited | Liverpool | 2015 |
| Leonards Pigs Limited | Attleborough | 2016 |
| Leoware Limited | Norwich | 1962 |
| LES Beaux Lacs Limited | Broxbourne | 2002 |
| LES Blanches Vineries (UK) Limited | Wimborne | 2003 |
| LES Cotton Contractors Limited | Halesworth | 2004 |
| LES Halman Nurseries Limited | Knutsford | 2002 |
| LES Hughes & SON Ltd | Montgomery | 2007 |
| LES Lions Farm Limited | London | 1991 |
| LES Owen Dairy Supplies Limited | Welshpool | 2002 |
| Leslie Brown Contracting Services Ltd | Darlington | 2012 |
| Leslie Farm Services Ltd | Haddington | 2018 |
| Leslie Kennedy | Newton Abbot | 2010 |
| Leslie Murray Limited | Buckie | 2007 |
| Lesotho Rural Afforestation Holdings Ltd | Kington | 2025 |
| Less Travelled Lamb Limited | Stoke-On-Trent | 2020 |
| Lester (Fallen Stock) Limited | Bristol | 2004 |
| Lestrem Spinney (Fyfield) Limited | Loughton | 2017 |
| Let's Chat Ltd | London | 2017 |
| Let's Farm Extra CIC | Chester | 2023 |
| Let's Farm Limited | Chester | 2021 |
| Let's GET Racing Limited | Yarm | 2016 |
| Letchworth Garden City Angling Association Limited | Hertfordshire | 2003 |
| Letham Farm Fife Limited | Leven | 2010 |