| Kyi'Dar Limited | Manufacturing | 2021 |
| Kyjam Ltd | Hospitality | 2025 |
| KYM Media Ltd | Professional & scientific | 2024 |
| Kyseclothing Ltd | Wholesale & retail | 2025 |
| Kyverra Dynamics Ltd | Professional & scientific | 2026 |
| L & a Lettings Limited | Real estate | 2009 |
| L & a Property Services Ltd | Real estate | 2025 |
| L & J Packaging Holdings Limited | Financial services | 2024 |
| L & J Packaging Limited | Administrative & support | 1990 |
| L & J Portfolio Ltd | Real estate | 2021 |
| L & N Landscaping Ltd | Administrative & support | 2015 |
| L & R Bloodstock Limited | Agriculture & fishing | 2016 |
| L & T Group Co Ltd | Extraterritorial | 2000 |
| L B Motor Sales Ltd | Wholesale & retail | 2018 |
| L B Publicans Limited | Hospitality | 2006 |
| L B Surveyors Ltd | Professional & scientific | 2025 |
| L Brickworks Ltd | Construction | 2024 |
| L Daley Holdings Ltd | Financial services | 2023 |
| L Elwell Limited | Wholesale & retail | 2003 |
| L Gill Properties Limited | Real estate | 2018 |
| L Holub Ltd | Construction | 2024 |
| L Roffey Endoscopy Q.I. Consulting Ltd | Public administration | 2025 |
| L S MFG Ltd | Manufacturing | 2009 |
| L Singh Ltd | Construction | 2019 |
| L V Freight Ltd | Transport & logistics | 2024 |
| L&A Family Investment Company Limited | Financial services | 2026 |
| L&K Transportss Ltd | Transport & logistics | 2016 |
| L&M Food Co Ltd | Hospitality | 2023 |
| L&M Food Group Ltd | Wholesale & retail | 2026 |
| L&M United Ltd | Wholesale & retail | 2024 |
| L. S. Manufacturing U.K. Limited | Manufacturing | 2003 |
| L.A Electrical Solutions Limited | Construction | 2023 |
| L.D Brownlee (Financial Services) Ltd | Professional & scientific | 2007 |
| L.F.L.S 8202 Ltd | Arts & recreation | 2024 |
| L.R Burrows & Co. Limited | Wholesale & retail | 1946 |
| L.S. Embroidery Limited | Manufacturing | 2004 |
| L.S. Tutt (NP) Limited | Professional & scientific | 2015 |
| L.T.D. Enterprises Limited | Wholesale & retail | 2023 |
| L.V.G.H. Investments Limited | Construction | 2001 |
| L1NA V Limited | Real estate | 2025 |
| LA Alayaa by Sonnia Limited | Construction | 2025 |
| LA Cargo Ltd | Construction | 2019 |
| LA Giles Ltd | Administrative & support | 2022 |
| LA Grasii UK Ltd | Wholesale & retail | 2019 |
| LA Liguria Ltd | Hospitality | 2025 |
| LA Perla Fashion Ltd | Wholesale & retail | 2020 |
| LA Vera Wolverhampton Ltd | Hospitality | 2023 |
| LAA Houses Ltd | Real estate | 2026 |
| LAB Fit Ltd | Wholesale & retail | 2021 |
| LAB Investment Ltd | Wholesale & retail | 2025 |
| Labforte Ltd | Administrative & support | 2019 |
| Labmedexpert Diagnostic Limited | Education | 2020 |
| Labmedexpert Limited | Professional & scientific | 2017 |
| Labz Sports CIC | Education | 2025 |
| Labz Sports Consultancy Ltd | Education | 2022 |
| LAC1 Limited | Real estate | 2025 |
| Laddi Mobiles Ltd | Manufacturing | 2024 |
| Laddi Property Ltd | Real estate | 2025 |
| Lade Medicals Limited | Health & social care | 2024 |
| Ladime Family Company Limited | Health & social care | 2024 |
| Lado Real Estate UK Limited | Real estate | 2025 |
| Lads & Lasses School Wear Limited | Wholesale & retail | 2010 |
| Lady ANN Property Services Limited | Households | 2020 |
| Lady Helen's Hall Limited | Hospitality | 2015 |
| LAG Engineering Services Limited | Administrative & support | 2018 |
| Lagos African Store Ltd | Wholesale & retail | 2025 |
| Lahal Logistics Ltd | Transport & logistics | 2017 |
| LAI DO 2 Ltd | Hospitality | 2016 |
| Lakefulllamp Ltd | Administrative & support | 2022 |
| Lakeland Catering (UK) Limited | Hospitality | 2005 |
| Lakshmi Sweet Centre Limited | Wholesale & retail | 2000 |
| Lal's Assets Limited | Wholesale & retail | 2021 |
| Lalli and Son's Properties Limited | Real estate | 2025 |
| LAM Property Developments Ltd | Real estate | 2026 |
| Lambert Parker & Gaines Limited | Professional & scientific | 1897 |
| Lambic Limited | Real estate | 2008 |
| Lamda Building Design Ltd | Professional & scientific | 2024 |
| Lamination Solutions Ltd | Wholesale & retail | 2018 |
| Lamsdale Glazing Limited | Construction | 2002 |
| Lana Group of Companies Limited | Professional & scientific | 2021 |
| Lancashire Roadstone Limited | | 1938 |
| Lancaster & Co (Accountants) Limited | Professional & scientific | 2003 |
| Lancaster Haskins 2 LLP | | 2010 |
| Lancaster Haskins Limited | Professional & scientific | 2015 |
| Lancieco Ltd | Manufacturing | 2025 |
| Landa Property and Investments Limited | Real estate | 2025 |
| Landlords Property Checks Ltd | Wholesale & retail | 2025 |
| Landowner Homes One Limited | Construction | 1997 |
| Landowner Homes Three Limited | Construction | 1997 |
| Landowner Homes Two Limited | Construction | 1997 |
| Landport Meats Limited | Wholesale & retail | 2016 |
| Landstar Logistics Ltd | Transport & logistics | 2025 |
| Landwell Estates Ltd | Wholesale & retail | 2023 |
| Landywood Concrete Products Limited | Manufacturing | 2002 |
| Lanegreen (UK) Limited | Professional & scientific | 2001 |
| Laney Green Limited | Wholesale & retail | 2007 |
| Langa Holdings Limited | Health & social care | 2019 |
| Langtang Ltd | Hospitality | 2024 |
| Languagecert Ltd | Information & communication | 2026 |
| Lapwing Embalming Services Limited | Other services | 2010 |