| KVC Roofing & Building Ltd | Construction | 2025 |
| Kvector Limited | Information & communication | 2024 |
| KW Resprays Limited | Wholesale & retail | 2019 |
| KW Wealth Management Ltd | Financial services | 2016 |
| KWS3 Media Limited | Information & communication | 2015 |
| KY Sales Ltd | Wholesale & retail | 2026 |
| Kylr Holding Ltd | Real estate | 2026 |
| Kyte Car Parts & Lubricants Ltd | Wholesale & retail | 2017 |
| Kyzmetix Boutique Hair & Aesthetics Training Ltd | Other services | 2026 |
| L & D Consultancy Limited | Professional & scientific | 2023 |
| L & K Locksmiths Ltd | Manufacturing | 2019 |
| L & L Renewable Energy Ltd | Construction | 2022 |
| L & R Ayre Ltd | Health & social care | 2015 |
| L & R Saddles Ltd. | Manufacturing | 1992 |
| L & S Heating Services Ltd | Construction | 2003 |
| L a D S Management Ltd | Real estate | 2015 |
| L and L Brook Limited | Real estate | 2015 |
| L B Photography Ltd | Professional & scientific | 2019 |
| L C Catering Ltd | Hospitality | 2008 |
| L Cooper Contracting Limited | Construction | 2023 |
| L H Tree Services Limited | Other services | 2022 |
| L J Sutherland Limited | Administrative & support | 2015 |
| L K Resins Limited | Construction | 2016 |
| L M Griffith Estates Limited | Real estate | 2004 |
| L Moriarty Ltd | Other services | 2019 |
| L Poselay Limited | Wholesale & retail | 2024 |
| L Smith Surveying Ltd | Professional & scientific | 2023 |
| L V Doors Ltd | Wholesale & retail | 2018 |
| L Wright Holdings Limited | Financial services | 2022 |
| L&A Manufacturing Ltd | Manufacturing | 2022 |
| L&A Upholstery Ltd | Manufacturing | 2017 |
| L&D Project Management and Commercial Services Ltd | Professional & scientific | 2025 |
| L&E Beyond Group Ltd | Construction | 2022 |
| L&J's Driving School Limited | Education | 2023 |
| L&J's Passion for Finances Limited | Professional & scientific | 2021 |
| L&R Asset Management Ltd | Real estate | 2026 |
| L&S Bargain Bliss Limited | Wholesale & retail | 2024 |
| L&S Property Renovations Ltd | Construction | 2025 |
| L. a. B. Electrical Limited | Construction | 2016 |
| L. Bayliss Decorators Ltd | Construction | 2009 |
| L. C. I. Installation & Maintenance Limited | Construction | 2009 |
| L.E. Velo Club Limited(The) | Other services | 1983 |
| L.E.J Creatives Ltd | Administrative & support | 2025 |
| L.E.M Consultants Limited | Professional & scientific | 2022 |
| L.R. Brickwork Limited | Construction | 2026 |
| L.V.H. Coatings Limited | Manufacturing | 1990 |
| L4 Print Ltd | Wholesale & retail | 2018 |
| LA Alloys Limited | Financial services | 2012 |
| LA BAN Global Consulting Ltd | Professional & scientific | 2025 |
| LA Casa DEL Shawarma Ltd | Hospitality | 2024 |
| LA Commercials Ltd | Wholesale & retail | 2004 |
| LA Gabitza Events Ltd | Transport & logistics | 2023 |
| LA Services Limited | Transport & logistics | 2020 |
| LA Viva Foods Ltd | Hospitality | 2023 |
| La-Decor London Ltd | Wholesale & retail | 2024 |
| Laavanya Limited | Administrative & support | 2018 |
| LAB Machines EU Ltd | Professional & scientific | 2023 |
| Label Store (for the Animals) Ltd | Wholesale & retail | 2020 |
| Labyrinth Property Management Ltd | Real estate | 2024 |
| Lacotte Ltd | Administrative & support | 2022 |
| LAD Capital Holdings Ltd | Real estate | 2026 |
| LAD Chemist Limited | Wholesale & retail | 2001 |
| Laeba Care Ltd | Health & social care | 2019 |
| Laiba Smiles Ltd | Health & social care | 2025 |
| Laima Builder Ltd | Construction | 2016 |
| Lakecross Ltd | Education | 2026 |
| Lakhi Construction Ltd | Construction | 2026 |
| Lakin Properties Limited | Real estate | 2024 |
| LAL IT Consultant Ltd | Information & communication | 2024 |
| Lala G'S Pizza & Kebab House Ltd | Hospitality | 2024 |
| Lala G'S Pizza & Takeaway Ltd | Hospitality | 2026 |
| Lala Valeting Ltd | Other services | 2021 |
| Lalli Legal Services Ltd | Professional & scientific | 2019 |
| Lals Medical Services Ltd | Health & social care | 2023 |
| Lambard.Inc Ltd | Other services | 2025 |
| Landfills 2 Landmarks CIC | Water & waste | 2025 |
| Landscaping & General Maintenance Ltd | Administrative & support | 2014 |
| Landywood Estates Ltd | Real estate | 2020 |
| Landywood Holdings Ltd | Financial services | 2019 |
| Landywood Land and Acquisitions Ltd | Real estate | 2019 |
| Lane & Co Solicitors Limited | Professional & scientific | 2011 |
| Lane Reality Limited | Real estate | 2026 |
| Lane Wood Fuels Ltd | Wholesale & retail | 2019 |
| Langdale Western Limited | Real estate | 2000 |
| Langford Close (Walsall) Limited | Professional & scientific | 1978 |
| Langley Group Investments Limited | Construction | 2018 |
| Langley Properties SW Limited | Construction | 2020 |
| Langstaff Project Planning Limited | Professional & scientific | 2008 |
| Lanhide Ltd | Energy | 2015 |
| Lani Health Solutions Ltd | Health & social care | 2024 |
| Lanten Energy Ltd | Professional & scientific | 1995 |
| Lanten Metering Services Ltd | Professional & scientific | 2013 |
| Lanty Synergy Enterprises Ltd | Wholesale & retail | 2025 |
| Laples Ltd | Wholesale & retail | 2023 |
| Lapworth Motors Ltd | Wholesale & retail | 2024 |
| Larchwood Supplies Limited | Other services | 2016 |
| Larvic Limited | Wholesale & retail | 1999 |
| Lascar K Construction Ltd | Construction | 2020 |
| Laser Tools Limited | Professional & scientific | 1998 |
| Laser Tools Racing Limited | Extraterritorial | 2020 |