| Kyle Investments Limited | Professional & scientific | 2001 |
| Kzar Childcare Limited | Education | 2007 |
| Kzar Property Limited | Construction | 2007 |
| L & a Prestige Books Ltd | Wholesale & retail | 2025 |
| L H Consultancy 2005 Ltd | Professional & scientific | 2005 |
| L&C Real Estate Investment Ltd | Real estate | 2025 |
| L&D Scenery Limited | Construction | 2025 |
| L&O Strategic Limited | Construction | 2021 |
| L.B. Technical Associates Limited | Construction | 2001 |
| L.E.C. Electrical Engineers Limited | Construction | 1997 |
| L.K. Executive Services Ltd | Transport & logistics | 2018 |
| LA Fontaine Management Ltd | Households | 2019 |
| Labintee Ltd | Professional & scientific | 2025 |
| Labotronics Ltd | Manufacturing | 2022 |
| Labtron Equipment Ltd | Manufacturing | 2015 |
| Lacasa Property Assests Ltd | Real estate | 2021 |
| Ladies HQ Limited | Other services | 2013 |
| Ladymead Holdings Limited | Transport & logistics | 2026 |
| Lakeside Business Park Management Limited | Households | 1999 |
| Lamichhane Property Group Limited | Real estate | 2025 |
| Lamplight Consultants Limited | Wholesale & retail | 1997 |
| Lancaster Road Management Company Limited | Real estate | 2026 |
| Lancaster Strategies Limited | Information & communication | 2003 |
| Lance-A-Lot Limited | Extraterritorial | 2004 |
| Lancescapes Limited | Administrative & support | 2012 |
| Lanescot Ltd | Other services | 2001 |
| Langdale Title Limited | Professional & scientific | 2016 |
| Langdon Construction Services Limited | Administrative & support | 2006 |
| Langstaff,Erembert and Co.Limited | Transport & logistics | 1951 |
| Lanita Group Limited | Wholesale & retail | 2023 |
| Lanode Limited | Information & communication | 1992 |
| Lansdowne Court Flat Management (Alton) Limited | Households | 1978 |
| Laoben Ltd | Information & communication | 2016 |
| Laradan Resourcing Limited | Administrative & support | 2009 |
| Larchwood Residents Company Limited | Households | 1982 |
| Larco Homes Limited | Real estate | 2018 |
| Lark Rise Advisory Ltd | Professional & scientific | 2026 |
| Larsen Homebrew (UK) Limited | Wholesale & retail | 2003 |
| Larsen Wholesale Group Ltd | Wholesale & retail | 2023 |
| Lash Element Ltd | Wholesale & retail | 2026 |
| Last Visual Ltd | Construction | 2020 |
| Latham Eversley Limited | Professional & scientific | 2020 |
| Latimer House (Beaconsfield) Management Company Limited | Households | 2022 |
| Latsec Limited | Information & communication | 2014 |
| Laud Construction Ltd | Construction | 2025 |
| Lauriston Flat Management Limited | Households | 1969 |
| Lawfords Hairdressing Limited | Other services | 1999 |
| Lawson Developments Limited | Professional & scientific | 1993 |
| Lawson Home Improvements Ltd | Manufacturing | 2019 |
| Laxmi Landlord Limited | Real estate | 2023 |
| Layers Consulting Ltd | Professional & scientific | 2007 |
| LB Windows & Doors Limited | Construction | 2019 |
| LBC Design and Install Limited | Construction | 2023 |
| LBC Residential Ltd | Real estate | 2026 |
| LCP Designs Ltd | Professional & scientific | 2017 |
| LDB Property Limited | Professional & scientific | 1996 |
| LDC Designs Ltd | Professional & scientific | 2023 |
| LDC Logistic Consultants Ltd | Transport & logistics | 2024 |
| LDF Flooring Limited | Construction | 2016 |
| LDM Group UK Holdings Ltd | Construction | 2023 |
| LE Smurf Lighting Limited | Administrative & support | 2018 |
| Leader and Team Limited | Professional & scientific | 2016 |
| Leaders First in Letting Limited | Professional & scientific | 2013 |
| Leaders Group | Professional & scientific | 1995 |
| Leaders Jordans Limited | Extraterritorial | 2012 |
| Leaders Lettings Limited | Professional & scientific | 2009 |
| Leaders Lettings Trading Limited | Professional & scientific | 2005 |
| Leaders Limited | Real estate | 1983 |
| Leaders MA (Holdings) Limited | Extraterritorial | 2013 |
| Leaders Sales Limited | Real estate | 2002 |
| Leaders the Rental Agents Limited | Professional & scientific | 2013 |
| Leaders Waterside Properties Ltd | Extraterritorial | 1997 |
| Leadership and Culture Transformations Ltd | Professional & scientific | 1989 |
| Leadingedj Limited | Professional & scientific | 2004 |
| Leaf Operations Ltd. | Wholesale & retail | 2025 |
| Leafield Feeds Limited | Manufacturing | 2010 |
| Leak Delete Limited | Information & communication | 2015 |
| Leanspring Limited | Households | 1988 |
| Leapfrog Group Holdings Limited | Financial services | 2019 |
| Leapsand Limited | Real estate | 2023 |
| LEC Building and Interior Contractors Limited | Professional & scientific | 2008 |
| Lecruit Limited | Administrative & support | 2016 |
| Ledger Capital Limited | Financial services | 2015 |
| Ledger Gardens (Sandcross Lane) Management Company Limited | Households | 2019 |
| Ledgerify Ltd | Professional & scientific | 2024 |
| Leemerh Group Ltd | Professional & scientific | 2026 |
| Legacy Performance Sportswear Ltd | Wholesale & retail | 2019 |
| Legatum Group Limited | Information & communication | 2026 |
| Legc Associates Limited | Administrative & support | 2003 |
| Legend Accommodations Ltd | Real estate | 2023 |
| Legend Vacation Club Title Limited | Professional & scientific | 2010 |
| Legendary Services Limited | Health & social care | 2016 |
| Leilarn Services Ltd | Construction | 2013 |
| Lekali Food Limited | Hospitality | 2025 |
| Lemon Fresh Cleans (Woking) Limited | Other services | 2018 |
| Lemon Fresh Laundry Ltd | Administrative & support | 2019 |
| Lemon Tree Construction Limited | Construction | 2024 |
| Lemuria Invest Limited | Real estate | 2010 |
| Lenwell Limited | Extraterritorial | 1990 |
| Lettme Invest Limited | Real estate | 2021 |