| Lake Land Assets Limited | Real estate | 2014 |
| Lakeland Properties Investments Limited | Real estate | 2014 |
| Lakeside Fisheries Ltd | Agriculture & fishing | 2022 |
| Lakeview (Kings Langley) Limited | Households | 1987 |
| Lakin & Co Group Limited | Real estate | 2009 |
| Lakshya Software Technologies Private Limited | Information & communication | 2024 |
| Lalli Legacy Limited | Real estate | 2020 |
| Lalokimo Limited | Health & social care | 2014 |
| Lama Limited | Wholesale & retail | 1983 |
| Lamaa and Company II Limited | Hospitality | 2025 |
| Lamaa and Company Limited | Hospitality | 2003 |
| Lamaa Holdings Ltd | Financial services | 2018 |
| Lamaa Services Limited | Real estate | 2016 |
| Lamb Bar Bar Limited | Administrative & support | 2010 |
| Lamba G Properties Limited | Real estate | 2018 |
| Lampco Construction Limited | Construction | 2013 |
| Lampco Properties Limited | Real estate | 2005 |
| Lancar Group Ltd | Transport & logistics | 2020 |
| Lancaster Court Northwood Limited | Real estate | 2014 |
| Lancaster House (Hertford) Management Limited | Real estate | 2023 |
| Landmark Financial Consultancy Ltd | Professional & scientific | 2019 |
| Landmark Mobile Tyres Ltd | Wholesale & retail | 2023 |
| Landmark Protection Group Ltd | Administrative & support | 2025 |
| LANDMARK1 Developers Limited | Construction | 2025 |
| Landsculptors Ltd | Professional & scientific | 2024 |
| Landswick Development Limited | Real estate | 2023 |
| Lane's Clink Liquor Ltd | Manufacturing | 2026 |
| Langthorne Investments Limited | Financial services | 2025 |
| Languages Management Ltd | Administrative & support | 2018 |
| Lansbury Avenue Ltd | Real estate | 2024 |
| Lantern (Real Estate) Limited | Construction | 1964 |
| LAO Cheng DU Uxbridge Limited | Hospitality | 2018 |
| LAP Property Design Ltd | Real estate | 2026 |
| Lap-Jap Frozen Foods Ltd | Hospitality | 2026 |
| Laray Foods Limited | Wholesale & retail | 2020 |
| Laray Healthcare Services Ltd | Administrative & support | 2018 |
| Laray Limited | Information & communication | 2017 |
| Laray Lodge Ltd | Administrative & support | 2018 |
| Larkridge Construction Limited | Construction | 2006 |
| Larkridge Limited | Transport & logistics | 2021 |
| Lasbae Limited | Other services | 2021 |
| Laser Construction Ltd | Construction | 2022 |
| Last Piece Ltd. | Wholesale & retail | 2017 |
| Lasting C Change Limited | Professional & scientific | 2021 |
| Latticeservices Limited | Construction | 2018 |
| Laurel Green Healthcare Services Ltd | Administrative & support | 2023 |
| Laurence Court (Marlow) Limited | Households | 1981 |
| Lavanyah Homes and Stays Ltd | Hospitality | 2026 |
| Lavazza Coffee (UK) Limited | Wholesale & retail | 1989 |
| Lavender Sky Limited | Real estate | 2013 |
| Lavish Events Ltd | Health & social care | 2013 |
| Lavish Invest Limited | Real estate | 2024 |
| Lavish Lives Limited | Wholesale & retail | 2024 |
| Lawcaussidicusworld.Net Limited | Health & social care | 2016 |
| Lawlor Lighting & Maintenance Services Limited | Construction | 2017 |
| Lawlor Private Investment Ltd | Extraterritorial | 2012 |
| Lawo Ltd | Manufacturing | 2018 |
| Lawrence Grove Studio Limited | Wholesale & retail | 2022 |
| LAY Wood Ltd | Construction | 2025 |
| LAZ - W Essentials Ltd | Information & communication | 2026 |
| Lazluxcars Ltd | Transport & logistics | 2025 |
| LB Event Management Ltd | Administrative & support | 2025 |
| LB Expressions Limited | Wholesale & retail | 2013 |
| LBF Construction Limited | Construction | 2021 |
| Lb’S Kerbside Autos Ltd | Professional & scientific | 2026 |
| LC Construction Services Ltd | Construction | 2021 |
| LC Golden Touch Ltd | Other services | 2024 |
| LC Roofing Solutions Ltd | Construction | 2025 |
| Ldbs Frays Academy Trust | Education | 2012 |
| LDV Properties Limited | Real estate | 2020 |
| LE Casa Property Solutions Limited | Construction | 2024 |
| LE Cure Medical Services Limited | Health & social care | 2025 |
| LE Mighty Oak Limited | Real estate | 2008 |
| LE Nuage Limited | Information & communication | 2018 |
| LE Shop Limited | Real estate | 2010 |
| Leadcooler Ltd | Information & communication | 2023 |
| Leader Car Sales Ltd | Wholesale & retail | 2023 |
| Leading Consultant Service Ltd | Wholesale & retail | 2022 |
| Leah Wood Art Work Limited | Arts & recreation | 2023 |
| Leander Films Ltd | Information & communication | 2011 |
| Learning Labs Hayes Ltd | Education | 2018 |
| Learning Labs Hounslow Ltd | Education | 2021 |
| Learning Labs Publications Ltd | Education | 2019 |
| Leasehold Management Holdings Ltd | Real estate | 2020 |
| Leather Prive Ltd | Wholesale & retail | 2024 |
| Leatherton Limited | Wholesale & retail | 2024 |
| Lebanese Deli Ltd | Hospitality | 2025 |
| Lebo Grill House Ltd | Hospitality | 2026 |
| LED H Build Limited | Real estate | 2024 |
| LED Lighting Dynamics Ltd | Manufacturing | 2007 |
| LEE B Henry Limited | Construction | 2026 |
| Leemarc Consulting Ltd | Information & communication | 2006 |
| Leena Swan Coaching Ltd | Other services | 2022 |
| Lees Place 4 Ltd | Real estate | 2025 |
| Legacy Homes Limited | Households | 2014 |
| Legacy Nest Investments Ltd | Hospitality | 2023 |
| Legacy Practice Services Ltd | Other services | 2026 |
| Legacy Retail Store Ltd | Wholesale & retail | 2025 |
| Legacy Soccer Academy Ltd | Arts & recreation | 2012 |
| Legendweb Ltd | Information & communication | 2023 |