| KY Star Services Ltd | Wholesale & retail | 2025 |
| Kyarum Limited | Professional & scientific | 2021 |
| KYK Management Ltd | Extraterritorial | 2019 |
| Kylendale Limited | Financial services | 2004 |
| KZL Forever Ltd | Transport & logistics | 2017 |
| L & O Building Consultants Ltd | Construction | 2012 |
| L & R Fabrications Limited | Construction | 2025 |
| L & T Contractors Ltd | Construction | 2023 |
| L & X Tax Ltd | Professional & scientific | 2024 |
| L a EAR Care Clinic Ltd | Health & social care | 2021 |
| L Boshell Consultancy Ltd | Professional & scientific | 2024 |
| L Corney Electrical Ltd | Construction | 2009 |
| L D Homestyle Ltd | Wholesale & retail | 2003 |
| L Gallant Signs Limited | Construction | 2025 |
| L Houghton Ltd | Information & communication | 2020 |
| L N L Builders Limited | Construction | 2022 |
| L P Partitions Limited | Construction | 2020 |
| L T P Contracts Limited | Construction | 2009 |
| L T Tucker Limited | Construction | 2015 |
| L Tucker Electrical Ltd | Construction | 2019 |
| L V B Packaging Limited | Manufacturing | 2014 |
| L Volpe Plumbing and Heating Ltd | Construction | 2026 |
| L&A Merchandise Ltd | Transport & logistics | 2019 |
| L&D CAD Ltd | Professional & scientific | 2024 |
| L&D Print Services Limited | Manufacturing | 2026 |
| L&J Foods Holdings Ltd | Manufacturing | 2026 |
| L&R Hospitality Essentials Ltd | Agriculture & fishing | 2024 |
| L. S Laser Cutting Ltd | Manufacturing | 2011 |
| L.A.K Developments Limited | Real estate | 2025 |
| L.I.M Properties Limited | Real estate | 2018 |
| L.J Quinn Electrical Contractors Ltd | Construction | 2016 |
| L.J.M Property Essex Limited | Real estate | 2021 |
| L.P. Window Controls Limited | Construction | 2006 |
| L.R.G. (Finance & Leasing) Limited | Extraterritorial | 1989 |
| LA Dolce Italia Tiramisu Limited | Administrative & support | 2016 |
| LA Mariée Limited | Other services | 2017 |
| LAB (UK) Limited | Professional & scientific | 2008 |
| Laceys Event Services Ltd | Other services | 2013 |
| Ladies of Leisure London Ltd | Wholesale & retail | 2026 |
| Ladun Cakes and Services Limited | Manufacturing | 2025 |
| Lady Decor Services Limited | Administrative & support | 2025 |
| Lady's Pride Beautycare Ltd | Information & communication | 2024 |
| Laggers Limited | Construction | 2020 |
| Laindon Commercial Services Limited | Administrative & support | 2014 |
| Laindon Community Centre Limited | Administrative & support | 2021 |
| Laindon Community Trading Company Limited | Hospitality | 1994 |
| Laindon Credit Services Limited | Administrative & support | 1936 |
| Laindon Holdings Limited | Professional & scientific | 1937 |
| Laindon Kebab Ltd | Hospitality | 2023 |
| Laindon Ltd | Professional & scientific | 2024 |
| Laindon Metals Ltd | Water & waste | 2021 |
| Laindon Properties Ltd | Real estate | 2025 |
| Laindon Trading LLP | | 2010 |
| LAK Traders Ltd | Wholesale & retail | 2022 |
| Lakefield Enterprises Ltd | Construction | 1995 |
| Lakeside Curry Ltd | Hospitality | 2018 |
| Lakeview Design & Build Ltd | Construction | 2018 |
| Lakeview Lettings Limited | Real estate | 2022 |
| Lakeview Property Group Limited | Real estate | 2016 |
| Lakewood Capital Limited | Professional & scientific | 2019 |
| Landlord Property Maintenance & Services Limited | Construction | 2024 |
| Landscape a Plan Ltd | Construction | 2020 |
| Landwey UK Limited | Construction | 2021 |
| Landz Cleaning Ltd | Administrative & support | 2016 |
| Lane Design Studio Limited | Professional & scientific | 2020 |
| Lanfid Autos Limited | Wholesale & retail | 2017 |
| Lang Financial Services Limited | Financial services | 2006 |
| Langdon Associates Limited | Professional & scientific | 2013 |
| Langdon Green Limited | Information & communication | 2024 |
| Langdon Hills Developments Limited | Construction | 2006 |
| Langdon Hills Estate Residents Association Ltd | Professional & scientific | 2019 |
| Langdon Hills Homes Limited | Real estate | 2021 |
| Langdon Hills Lettings Ltd | Real estate | 2025 |
| Langdon Property Ltd | Real estate | 2023 |
| Lange Studios Ltd | Professional & scientific | 2020 |
| Lanplex Limited | Professional & scientific | 2013 |
| Lanz Security Ltd | Administrative & support | 2022 |
| Lanzz Security Ltd | Administrative & support | 2022 |
| Laochra Data Services Ltd | Information & communication | 2017 |
| Laouami Limited | Health & social care | 2013 |
| Laryss Trans Ltd | Transport & logistics | 2018 |
| Laser Magic - Made With Love Ltd | Wholesale & retail | 2024 |
| Lash Bank Ltd | Wholesale & retail | 2019 |
| Lashes by LOZ Ltd | Other services | 2022 |
| Last One Standing Limited | Extraterritorial | 2016 |
| Latchford & Sons Carpentry Limited | Manufacturing | 2017 |
| Lauren Brooke Enterprises Ltd | Administrative & support | 2024 |
| Laurens D'Auray Limited | Other services | 2003 |
| Lawal Teaching Lessons Limited | Education | 2025 |
| Lawal TM Ltd | Construction | 2024 |
| Lawmer Gold Assets & Investments Ltd | Real estate | 2012 |
| Lawon BAK Limited | Professional & scientific | 2016 |
| Lawow Ltd | Education | 2024 |
| Lawrence & Browne Ltd | Real estate | 2012 |
| Lawrence and Smith Limited | Real estate | 2020 |
| Lazizall Ltd | Health & social care | 2022 |
| Lazy Sloth Coffee Ltd | Hospitality | 2024 |
| LB Blinds Limited | Manufacturing | 2025 |
| LB Exterior Services Ltd | Administrative & support | 2025 |
| LB Skin & Laser Limited | Other services | 2026 |