| Kwik MOT Manchester Ltd | Wholesale & retail | 2021 |
| Kwnet Ltd | Wholesale & retail | 2023 |
| Kyba Ltd | Wholesale & retail | 2023 |
| KYD Investments Limited | Real estate | 2015 |
| KYN Pharma Ltd | Professional & scientific | 2022 |
| Kyng COD Limited | Hospitality | 2015 |
| Kynoch Lewis Partnership Limited | Professional & scientific | 2003 |
| Kyoudai Ramen Ltd | Hospitality | 2026 |
| L & D Supplies Ltd | Transport & logistics | 2001 |
| L & H Driveways Limited | Construction | 1994 |
| L D Roberts Limited | Construction | 2016 |
| L M C Surveying Limited | Professional & scientific | 2015 |
| L M Stone Limited | Real estate | 2019 |
| L N Jeavons & SON (Heating and Plumbing) Limited | Construction | 1978 |
| L S Builders Midlands Ltd | Administrative & support | 2019 |
| L&A Performance Limited | Professional & scientific | 2017 |
| L&M Medical Group Limited | Health & social care | 2023 |
| L&S Human Capital Ltd | Administrative & support | 2017 |
| L'Cree's Signature Ltd | Wholesale & retail | 2021 |
| L-K-S Contracts UK Ltd | Construction | 2021 |
| L. Fulcher Limited | Extraterritorial | 1978 |
| L. M. Buxton Ltd | Information & communication | 2016 |
| L.A Jones Properties Ltd | Real estate | 2026 |
| L.A.D.S. Repetition Company Limited | Manufacturing | 1973 |
| L.Cooper Sprinkler Installations Ltd | Administrative & support | 2019 |
| L.D.A Pipework Installation Ltd | Construction | 2019 |
| L.H. Dance Studio Limited | Arts & recreation | 2025 |
| L.J.Clegg Limited | Extraterritorial | 1960 |
| L.J.S Fencing Ltd | Construction | 2017 |
| L.N.Mitchell Limited | Agriculture & fishing | 1956 |
| L5 Enterprises Limited | Information & communication | 2009 |
| LA (Trenchard) Build Ltd | Construction | 2025 |
| LA Beauty & Aesthetix Ltd | Other services | 2022 |
| LA Casita Midlands Ltd | Hospitality | 2019 |
| LA Cultura Group Ltd | Professional & scientific | 2016 |
| LA MAC Consultancy Limited | Professional & scientific | 2025 |
| LA Terra Group Ltd | Financial services | 2021 |
| Labbaik Properties Ltd | Real estate | 2025 |
| LAD Trading & Service Ltd | Other services | 2023 |
| LADIES2CLEAN Ltd | Administrative & support | 2023 |
| Ladrik Properties Limited | Real estate | 2024 |
| Laila's Design Office Ltd | Professional & scientific | 2022 |
| Lain Construction Limited | Construction | 2017 |
| Lakescroft Limited | Real estate | 2016 |
| Lally Properties Limited | Real estate | 2025 |
| Lambda Properties Limited | Construction | 1994 |
| Lambda Property Investments Ltd | Real estate | 2025 |
| Lambda Property Management (Birmingham) Ltd | Real estate | 2025 |
| Lambeth & Brixton Community Funeral Services Limited | Extraterritorial | 1941 |
| Lambeth Funeral Services Ltd. | Extraterritorial | 1961 |
| Lambtree Ltd | Hospitality | 2022 |
| Landkey Limited | Administrative & support | 2018 |
| Landmark Distribution Limited | Construction | 2023 |
| Langan Carpets & Interiors Limited | Construction | 2002 |
| Langley Hall Management Limited | Households | 1988 |
| Langley Heath Enterprises Limited | Professional & scientific | 1982 |
| Langthorne Limited | Wholesale & retail | 2012 |
| Lantern Housing Limited | Real estate | 2019 |
| Lantic Bay Marine Ltd | Wholesale & retail | 2026 |
| Lanyon BPM Consulting Ltd | Information & communication | 2009 |
| LAP Consulting Community Interest Company | Health & social care | 2009 |
| Lapislibrary Limited | Information & communication | 2023 |
| Lapra Limited | Households | 1979 |
| Laser Skin Leeds Ltd | Other services | 2025 |
| Laton Limited | Real estate | 2001 |
| Latticemail Ltd | Information & communication | 2019 |
| Lauben Limited | Professional & scientific | 2007 |
| Launch-Uk Ltd | Information & communication | 2005 |
| Lauraconwayhair Ltd | Other services | 2022 |
| Lavender Rose Consulting Ltd | Professional & scientific | 2015 |
| Lavender Rose Properties Ltd | Real estate | 2026 |
| Law Camp Limited | Professional & scientific | 2016 |
| Lawn Care SC Limited | Administrative & support | 2019 |
| Lawrence Funeral Service Limited(The) | Extraterritorial | 1962 |
| LAY Brothers Limited | Wholesale & retail | 1982 |
| Layla Enterprises Ltd | Wholesale & retail | 2024 |
| LBF Plant & Machinery Sales Limited | Wholesale & retail | 2021 |
| LBP 2000 Limited | Real estate | 1995 |
| LBW Project Management Limited | Administrative & support | 2023 |
| LC Property Renovations Ltd | Construction | 2023 |
| LDP Homes and Construction Ltd | Construction | 2024 |
| LEA Connex Ltd | Professional & scientific | 2026 |
| LEA Marston Shooting Club Ltd | Arts & recreation | 2013 |
| LEA Marston Sports Limited | Arts & recreation | 2023 |
| LEA Valley Funeral Services Limited | Extraterritorial | 1996 |
| Lea-Goodman Limited | Wholesale & retail | 2023 |
| Leacy Property Limited | Real estate | 2008 |
| Leading for Success Ltd | Education | 2017 |
| Leaford Farm Barns Limited | Construction | 2023 |
| Leaford Farm Limited | Financial services | 2021 |
| Leafton Limited | Hospitality | 2025 |
| Leafwise Ltd | Agriculture & fishing | 2023 |
| Leamington Spa Investments (Southern) Ltd | Real estate | 2024 |
| Leamington Spa Partnership (Southern) LLP | | 2024 |
| Leamingtonspa Developments Ltd | Construction | 2015 |
| Lean Craft Global Ltd | Wholesale & retail | 2024 |
| Learning Academy and Training Ltd | Education | 2024 |
| Learning Journeys Consulting Limited | Education | 2014 |
| Learning Made Easy Limited | Education | 2022 |
| Leaste DI Soha Limited | Manufacturing | 2019 |