| KW Nails & Beauty Ltd | Other services | 2023 |
| KY Homes Limited | Real estate | 2024 |
| Kydoni Consulting Limited | Professional & scientific | 2024 |
| Kylecomms Ltd | Information & communication | 2025 |
| Kyum Properties Ltd | Real estate | 2026 |
| L & O Investments (U.K.) | Professional & scientific | 1996 |
| L B Commercial Fittings Ltd | Construction | 2021 |
| L Brown Quantity Surveying Ltd | Professional & scientific | 2026 |
| L D Golf Ltd | Arts & recreation | 2016 |
| L G Gutter Cleaning Commercial Limited | Other services | 2018 |
| L G Gutter Cleaning Services Limited | Administrative & support | 2016 |
| L G Solar Panel Meshing & Cleaning Services Limited | Other services | 2023 |
| L G Window Cleaning Services Limited | Other services | 2021 |
| L H Hydraulics Limited | Manufacturing | 2017 |
| L M Joinery and Building Services Limited | Construction | 2024 |
| L Marsh Services Limited | Professional & scientific | 2023 |
| L P M Trans Limited | Transport & logistics | 2023 |
| L S Civils Limited | Construction | 2008 |
| L&S Rural Ltd | Hospitality | 2023 |
| L.C.C. Transport Limited | Information & communication | 1990 |
| L3EMTECH Ltd | Manufacturing | 2024 |
| L8WATERTRAINING Ltd | Professional & scientific | 2015 |
| LA DOI Pasi Scunny Ltd | Wholesale & retail | 2023 |
| LA Equine Limited | Agriculture & fishing | 2016 |
| LA Gardening Services Ltd | Administrative & support | 2025 |
| LA Mona Cakes Boutique Ltd | Wholesale & retail | 2026 |
| LA Petite Cafe Ltd. | Hospitality | 2023 |
| Laark Diagnostics Limited | Health & social care | 2018 |
| Labham General Stores Limited | Wholesale & retail | 2024 |
| Laiyun Ltd | Hospitality | 2026 |
| Lakes Ealand 18 Ltd | Construction | 2021 |
| Lakes Ealand Limited | Construction | 2021 |
| Lakes Ealand Management Ltd | Construction | 2021 |
| Lakeside Radio Ltd | Information & communication | 2026 |
| Lakeside Thorpe Limited | Wholesale & retail | 2016 |
| Lally Holdings Ltd | Financial services | 2018 |
| Lamano Pasta Ltd | Hospitality | 2026 |
| Lampos Limited | Professional & scientific | 2015 |
| Lanes Countryside Services Limited | Other services | 2015 |
| Langton AV Solutions Ltd | Arts & recreation | 2025 |
| Langtry Design Ltd | Extraterritorial | 2006 |
| LAS Metals Limited | Wholesale & retail | 2003 |
| Lasaras Limited | Real estate | 2019 |
| Laundry Lounge Ltd | Other services | 2021 |
| Lauren Ramsay Radiology Ltd | Health & social care | 2023 |
| Laurentiu Pro Express Ltd | Transport & logistics | 2025 |
| Laurilsel Property Holdings Limited | Extraterritorial | 2025 |
| Lavender Town Trading Ltd | Wholesale & retail | 2026 |
| Law Exports Limited | Wholesale & retail | 2008 |
| Lawson Medical Limited | Health & social care | 2015 |
| Laxey House Trading Ltd | Wholesale & retail | 2025 |
| Lazar Transport Services Limited | Transport & logistics | 2024 |
| Laztex Limited | Arts & recreation | 2009 |
| LBJ Medical Limited | Health & social care | 2021 |
| LBM Developments Limited | Construction | 2026 |
| LD Engineering (Scunthorpe) Ltd | Professional & scientific | 2021 |
| LDB Plumbing & Heating & SON Ltd | Construction | 2024 |
| Ldrd Trading Limited | Wholesale & retail | 2025 |
| Leaders in Safeguarding Limited | Education | 2006 |
| Leadus Trade Ltd | Wholesale & retail | 2024 |
| Leah Nails Limited | Other services | 2023 |
| Lean Energy Ltd | Information & communication | 2026 |
| Lean Living Ltd | Hospitality | 2016 |
| Lease Extensions Organisation Limited | Real estate | 2021 |
| Lebus Furniture Limited | Real estate | 2005 |
| Lebus Upholstery Limited | Manufacturing | 2005 |
| LED Training Ltd | Education | 2023 |
| Ledgerwood Morgan (Sports Cars) Limited | Wholesale & retail | 2010 |
| Leepizza Limited | Hospitality | 2019 |
| Leggotts Jewellers Limited | Wholesale & retail | 2002 |
| Leisure Components Ltd | Other services | 2022 |
| Lema Takeaway Limited | Hospitality | 2025 |
| Lenko Care Limited | Health & social care | 2015 |
| Lesman Ltd | Transport & logistics | 2016 |
| Level UP Merchandise Limited | Wholesale & retail | 2024 |
| Lewis GAS and Plumbing Services Limited | Construction | 2020 |
| Lewis Goodhand Ltd | Construction | 2025 |
| Lgaps Limited | Construction | 2021 |
| LGJ Vehicle Paintwork Services Limited | Wholesale & retail | 2012 |
| LGS Automotive Sales Ltd | Wholesale & retail | 2024 |
| LGS Car Sales Ltd | Wholesale & retail | 2024 |
| LH Power Limited | Manufacturing | 2024 |
| LHR Developments Ltd | Wholesale & retail | 2023 |
| Liam Flanagan Limited | Construction | 2008 |
| Liam Hewson Ltd | Construction | 2020 |
| Liba&Angela Ltd | Transport & logistics | 2022 |
| Liberty Merchant Bar PLC | Manufacturing | 1984 |
| Libertylets Limited | Real estate | 2011 |
| Lifeline Healthcare Services Limited | Health & social care | 2022 |
| Lift Horizon Global Initiative Ltd | Information & communication | 2026 |
| Light UP Winterton CIC | Other services | 2023 |
| Lightleap Limited | Information & communication | 2022 |
| Lili Trans Ltd | Transport & logistics | 2025 |
| Limb Property and Investments Limited | Real estate | 2025 |
| Limb Shipping & Chartering (UK) Limited | Transport & logistics | 2009 |
| Limeade Properties Limited | Real estate | 2020 |
| Limelight Products Limited | Wholesale & retail | 2022 |
| Linacre Holdings Limited | Financial services | 2024 |
| Lincdesign Limited | Construction | 2017 |
| Lincoln Gardens Pre-School Ltd | Education | 2014 |