| Lawson Cypress Ltd | Administrative & support | 2020 |
| Lawson Surveying & Engineering Ltd | Professional & scientific | 2015 |
| Layene Consulting Ltd | Professional & scientific | 2026 |
| Lazy GAL Journals Ltd | Wholesale & retail | 2025 |
| Lazy Llama Coffee House Ltd | Wholesale & retail | 2019 |
| LBC Carpentry Building & Renovations Ltd | Administrative & support | 2008 |
| LBZ Limited | Information & communication | 2010 |
| LC GAS and Electric Services Ltd | Professional & scientific | 2019 |
| LC Trees and Landscaping Ltd | Administrative & support | 2023 |
| LCM Construction & Maintenance Ltd | Construction | 2024 |
| LCT Medical Limited | Professional & scientific | 2004 |
| LCV Finance & Leasing Ltd | Administrative & support | 2019 |
| LDA Properties Limited | Real estate | 2004 |
| LDB Molinera Ltd | Financial services | 2019 |
| LDC Consultancy Services Limited | Professional & scientific | 2018 |
| LDD Trading Ltd | Wholesale & retail | 2022 |
| LDF Enterprises Limited | Real estate | 2013 |
| LDK Sports Therapy Clinic Ltd | Health & social care | 2023 |
| LDN Luxury Build Ltd | Construction | 2023 |
| LDT Westerham Limited | Wholesale & retail | 1983 |
| Leadership WOW Factor Limited | Administrative & support | 2022 |
| Leah D Ltd | Transport & logistics | 2026 |
| Lean on ME Personal Training Ltd | Arts & recreation | 2023 |
| Leanach Limited | Real estate | 2014 |
| Lear Media Ltd | Information & communication | 2023 |
| Learnfx Ltd | Education | 2024 |
| Learning & Wellbeing Psychology CIC | Education | 2019 |
| Learning With Care Ltd | Education | 2026 |
| Leaside Auto Repairs Ltd | Wholesale & retail | 2025 |
| Leaside Cars Ltd | Water & waste | 2018 |
| Leaside Property Services Ltd | Real estate | 2021 |
| Leat Consulting Ltd | Professional & scientific | 2019 |
| Leat Services Ltd | Other services | 2009 |
| Leathem Consulting Ltd | Real estate | 2021 |
| Ledgemore Services & Supplies Limited | Professional & scientific | 2012 |
| Leeron Finance Ltd | Professional & scientific | 2025 |
| Leeway Bros Ltd | Construction | 2026 |
| Leeway Brothers Ltd | Construction | 2015 |
| Legacy Mortgage Services Ltd | Administrative & support | 2026 |
| Leggane Ltd | Real estate | 2013 |
| Leigh Clark Engineers Limited | Professional & scientific | 1989 |
| Leisure Employment Services Limited | Professional & scientific | 1969 |
| Lemonfield Limited | Administrative & support | 2015 |
| Lemstar Projects Ltd | Construction | 2024 |
| Leon's Catering Staff Ltd | Hospitality | 2005 |
| Leone & Co Notaries Ltd | Professional & scientific | 2016 |
| Leoni Fragrance Ltd | Manufacturing | 2026 |
| Leoni Group Ltd | Wholesale & retail | 2026 |
| Leon’S Plumbing & Construction Limited | Construction | 2023 |
| Lepidoptera Ltd | Administrative & support | 2025 |
| LER Group Ltd | Construction | 2020 |
| Leslie Properties Ltd | Real estate | 2020 |
| Let’S Switch IT Limited | Construction | 2025 |
| Level PAR Property Limited | Real estate | 2023 |
| Leverstock Autocare Ltd | Wholesale & retail | 2011 |
| Leverstock Consulting Ltd | Professional & scientific | 2022 |
| Leverstock Green Farmhouse Management Company Limited | Real estate | 2007 |
| Leverstock Green Lawn Tennis Club Limited | Arts & recreation | 2022 |
| Leverstock Green Property Management (2010) Limited | Households | 2010 |
| Leverstock Recruitment Limited | Administrative & support | 2020 |
| Levva Pro Service Ltd | Other services | 2026 |
| Lewis Daniels Transport Ltd | Transport & logistics | 2024 |
| Lewis Interactive Learning Ltd | Administrative & support | 2011 |
| Lewmax Programming Limited | Information & communication | 1994 |
| Lexability Education Ltd | Education | 2022 |
| Lexcap IP Limited | Financial services | 2025 |
| Lexitup Limited | Information & communication | 2013 |
| Lexx Publishing & Media Limited | Administrative & support | 2004 |
| Lezha Building Ltd | Construction | 2022 |
| Lgfh Limited | Construction | 2024 |
| LGG Properties Limited | Real estate | 2021 |
| LH Building Contractors Limited | Construction | 2013 |
| LH Cashmere Ltd | Wholesale & retail | 2014 |
| LH Design Services Ltd | Professional & scientific | 2023 |
| Liam Scott Developments Ltd | Construction | 2024 |
| Libelle Decor Ltd | Wholesale & retail | 2025 |
| Liberate Consultancy Limited | Professional & scientific | 2014 |
| Liberty Tea Rooms and Community Hub | Health & social care | 1999 |
| Lica Properties Ltd | Real estate | 2023 |
| Lichedes Ltd | Wholesale & retail | 2024 |
| Lickey Road (Longbridge) Estate Management Company Limited | Households | 2013 |
| Lifebeyondhorizons Ltd | Education | 2024 |
| Lifestyle Inclusion Future Together CIC | Education | 2022 |
| Lifestyle Studios and Healthy U Education and Well-Being Facility C.I.C. | Hospitality | 2014 |
| Light Them UP Event Hire Ltd | Other services | 2022 |
| Lightbeam Advisors Limited | Real estate | 2019 |
| Lighthouse Children's Residential Services Ltd | Health & social care | 2018 |
| Lighting by Plum Ltd | Professional & scientific | 2018 |
| Lightning FX Limited | Professional & scientific | 2019 |
| Lightoaks Investments Limited | Real estate | 1986 |
| Lights, Camera, Accounting Ltd | Professional & scientific | 2025 |
| Lilium Consultancy Ltd | Professional & scientific | 2024 |
| Lilley Developments Ltd | Construction | 2023 |
| Lilmisssunshyn Ltd | Health & social care | 2018 |
| Lime and Lead Global Ltd | Transport & logistics | 2017 |
| Lime Projects Limited | Manufacturing | 2007 |
| Liminocentric Ltd | Information & communication | 2018 |
| Limitless Engineering Services Ltd | Manufacturing | 2021 |
| LIN Bookkeeping Services Ltd | Professional & scientific | 2015 |
| Lindisfarne Court Management Company Limited | Households | 1988 |