| Lucksall Farm Ltd | Wisbech | 2022 |
| Lucksbridge Horticulture Limited | Spalding | 2008 |
| Lucky Animal Care Ltd | Loughborough | 2026 |
| Lucky Clucks Smallholding C.I.C. | Paignton | 2025 |
| Lucky Education Group Co., Ltd | Cardiff | 2021 |
| Lucky Landings Ltd | Bath | 2024 |
| Lucville Limited | Horsham | 2021 |
| Lucy Jackson Eventing Limited | Stow-On-The-Wold | 2021 |
| LUD Castle (Computing) Limited | Blairgowrie | 1986 |
| Ludchurch Farms Limited | Haverfordwest | 2002 |
| Ludford Farm Limited | Wrexham | 2025 |
| Ludpit Organic Cereals Farm Ltd | Ashford | 2024 |
| Ludwell Partners Limited | Devon | 2007 |
| Luffness Mains Farming Ltd | Longniddry | 1957 |
| Lugden Hill Farms Limited | Kings Lynn | 2018 |
| Lugg & Gould Limited | Dunfermline | 1990 |
| Luke Barton Horses and Ponies Ltd | Aughnacloy | 2026 |
| Luke Coleman Agricultural Services Limited | Wisbech | 2023 |
| Luke Collett Tree Surgeons Limited | Kingswinford | 2004 |
| Luke Jennings Tree Surgery Ltd | Ware | 2018 |
| Luke Mellor Farms Limited | Uttoxeter | 2017 |
| Lukes Logs Ltd | Carryduff | 2014 |
| Lullington Court Farm Limited | Bristol | 2015 |
| Lullula Ecology Limited | Eastleigh | 2024 |
| Lulu Services Limited | St. Albans | 2009 |
| Lulu's Doggy Day Care & Boarding Ltd | Southampton | 2025 |
| Lulu's Friends Ltd | Billingshurst | 2023 |
| Lulu's Kennels Ltd | Lincoln | 2026 |
| Lumanex Limited | Inverurie | 2024 |
| Lumber Jack Services Limited | Wolverhampton | 2016 |
| Lumber-Jacks Tree Services Ltd | Woking | 2019 |
| Lumberjack Jack Limited | Quorn | 2022 |
| Lumberjack Tree Services (Great Leighs) Ltd | Needham Market | 2024 |
| Lumberjoe Tree Services Limited | Wilmslow | 2025 |
| Lumberscapes Ltd | Hailsham | 2025 |
| Lumgair Poultry Limited | Tayside | 2004 |
| Lumley Farming Company Limited | Grantham | 2022 |
| Lumonyx Ltd | Epsom | 2025 |
| Lumsden Forestry Ltd | Inverness | 2019 |
| Luna Grooms Limited | Chester | 2023 |
| Lunan Bay Farm Limited | Arbroath | 2018 |
| Lunar Farming Ltd | Kilham | 2022 |
| Lunar Fishing Company Limited | Peterhead | 1981 |
| Lunar Harvest Fishing Limited | Peterhead | 2020 |
| Lunar QMG Limited | Peterhead | 2009 |
| Lunar Wren Ltd | Barfrestone | 2022 |
| Lunarex Limited | Bolton | 2021 |
| Lunasol Limited | Bridport | 1997 |
| Lund Court Farm Limited | Scarborough | 1985 |
| Lundforest Partnership Limited | Malton | 2021 |
| Lundie Castle Limited | Dundee | 2001 |
| Lundie Farming Limited | Carlisle | 2013 |
| Lune and Fylde Farmers Limited | Carnforth | 1996 |
| Lune Valley Pheasantries Limited | Kendal | 2005 |
| Lunesdale Equine Limited | Carnforth | 2020 |
| Lunn Upstream Consultants Limited | Ashford | 2002 |
| Lunnon Raising Poultry Ltd | Wirral | 2023 |
| Lunnun Trading and Sales Ltd | Derbyshire | 2002 |
| Luomara Ltd | Liverpool | 2026 |
| Lupus Engineering Services Limited | Aberdeenshire | 2000 |
| Lurashell Limited | London | 1977 |
| Lurcombe Farm Company | Devon | 1977 |
| Lure Geek Limited | Harpenden | 2015 |
| Lurra URA Ltd | Plymouth | 2022 |
| Luscious Greens Ltd | Lutterworth | 2020 |
| Luscombe Farms Limited | Taunton | 2014 |
| Lush Greens Bristol Community Interest Company | Bristol | 2024 |
| Lush Pups (UK) Limited | Ayr | 2018 |
| Lushland Limited | Gillingham | 2001 |
| Lusitania Fishing Ltd | London | 2024 |
| Lusitano Limited | Leeds | 2025 |
| Luss Estates Company | Alexandria | 1961 |
| Lusso Leaf Limited | Andover | 2020 |
| Lustre Enterprises Limited | Aberdeen | 2008 |
| Lutece Farm Ltd | Carmarthen | 2021 |
| Luton HOO Estate Nominees (NO.2) Limited | Luton | 2021 |
| Luton HOO Farming Company Limited | Luton | 2003 |
| Lutton & Co. Ltd | Moffat | 1990 |
| Lutton Farms (Steeple) Limited | Dorset | 1961 |
| Lutton Farms Limited | Birmingham | 2012 |
| Lutton Straw Contracting Limited | Station Road | 2016 |
| Luttrell Farm Limited | Tiverton | 2009 |
| Luwembagrace Ltd | Ruislip, | 2025 |
| LUX Drone Systems Ltd | Ipswich | 2026 |
| LUX E.C Ltd | Stirling | 2018 |
| LUX Floral Designs by Shell Ltd | London | 2019 |
| Luxe K9 Ltd | Linwood | 2023 |
| Luxinvent Ltd | Manchester | 2026 |
| LUXM1 Recruitment Limited | Mansfield | 2023 |
| Luxury Logburner Fitters Ltd | Liverpool | 2023 |
| Luxury Outdoor Getaways Ltd | Gloucester | 2020 |
| Luxury Rhule's Ltd | Cardiff | 2017 |
| LV Equestrian Limited | Epping | 2007 |
| LVT Services Ltd | Lancaster | 2025 |
| Lwaquaticraffles Limited | Stroud | 2025 |
| LWB Agricultural Services Ltd | Rugby | 2019 |
| LWS Services Ltd | Helensburgh | 2023 |
| Lybrook Farm Limited | Broadway | 2007 |
| LYC Business Consultancy Ltd | Leicester | 2013 |
| Lycett Racing Limited | Leamington Spa | 2018 |