| Lawfords Consulting Limited | Professional & scientific | 1999 |
| Lawnstripes Limited | Administrative & support | 2016 |
| Lawson Guitar Works Ltd | Wholesale & retail | 2026 |
| Layana London LLP | | 2013 |
| LAZ Lezzet Limited | Hospitality | 2022 |
| Lbm:Cg Ltd | Professional & scientific | 2026 |
| LCE(N8) Ltd | Wholesale & retail | 2012 |
| LCI Consulting Limited | Other services | 2019 |
| Lcif 2 General Partner Limited | Financial services | 2019 |
| Lcif Representatives Limited | Extraterritorial | 2012 |
| LCIF2-B General Partner Limited | Financial services | 2021 |
| LCS Sports Limited | Arts & recreation | 2015 |
| Lcsi | Financial services | 2017 |
| LDB Wealth Management Ltd | Professional & scientific | 2014 |
| LDN Blue Sky Limited | Real estate | 2021 |
| LDN Real Estate Limited | Real estate | 2020 |
| LDN Rentals Limited | Construction | 2022 |
| Leaders Within Ltd | Professional & scientific | 2025 |
| Leadership Circle Service Ltd | Professional & scientific | 2025 |
| Leadership Talent Coaching Limited | Other services | 2017 |
| Leafy Street Limited | Wholesale & retail | 1995 |
| Leal Designs Ltd | Professional & scientific | 2012 |
| Leanwise Limited | Wholesale & retail | 2011 |
| Leasenor Limited | Administrative & support | 2026 |
| Leatherluxe Limited | Wholesale & retail | 2016 |
| LEB Incorporated Ltd | Financial services | 2021 |
| Lebanese Please Ltd | Hospitality | 2018 |
| Ledmore (Services) Limited | Professional & scientific | 2014 |
| LEE Bernard Ltd | Health & social care | 2013 |
| LEE Hadley Props Limited | Construction | 2026 |
| LEE Jackson Ltd | Administrative & support | 2025 |
| LEE Lifting Services Limited | Administrative & support | 1986 |
| Leefi Limited | Manufacturing | 2018 |
| Leep Construction Ltd | Construction | 2019 |
| Leesco Food Ltd. | Real estate | 2022 |
| Leesco Hotel Limited | Hospitality | 2023 |
| Leesco Ltd | Hospitality | 2021 |
| Legends Boxing Gym Limited | Arts & recreation | 2007 |
| Leisure Development Partners Emea Limited | Other services | 2025 |
| Leisure Development Partners LLP | | 2009 |
| Leisure PR and Communications Limited | Professional & scientific | 2004 |
| Lelive UK Ltd | Wholesale & retail | 2023 |
| Lenelby Court Limited | Extraterritorial | 2013 |
| LEO & Rose Ltd | Real estate | 2016 |
| LEO Bancroft Holdings Limited | Financial services | 2012 |
| LEO Bancroft Salons Limited | Other services | 2012 |
| Leopard Logistics Limited | Transport & logistics | 2018 |
| LES Fleurs Consulting Limited | Administrative & support | 2024 |
| Lesimar Ltd | Other services | 2019 |
| Leslie James Property Limited | Wholesale & retail | 2020 |
| Levin IT Ltd | Information & communication | 2023 |
| LEW Advisory Limited | Administrative & support | 2020 |
| Lewis Hospitality Ltd | Hospitality | 2010 |
| Leyborne Capital Limited | Professional & scientific | 2013 |
| LF Therapy Ltd | Health & social care | 2024 |
| LG Electronics U.K. Ltd | Wholesale & retail | 1987 |
| LG Pro Landscaping Limited | Administrative & support | 2021 |
| LG Wealth Management Ltd | Professional & scientific | 2012 |
| LGM Aviation Capital Ltd | Transport & logistics | 2024 |
| LGM Aviation Ltd | Transport & logistics | 2017 |
| LGM Investments Ltd | Financial services | 2023 |
| LGM Marine Ltd | Wholesale & retail | 2020 |
| LHS Surveyors Ltd | Professional & scientific | 2015 |
| Libra Lettings & Property Management Limited | Real estate | 2023 |
| License to Chill Foods Ltd | Hospitality | 2008 |
| Lifeking Limited | Financial services | 2008 |
| Lightning Consortium Limited | Professional & scientific | 2005 |
| Lightup Tutoring Limited | Education | 2023 |
| Lighurst Limited | Manufacturing | 1977 |
| Lili Love (Photography) Limited | Professional & scientific | 2001 |
| Lime Juice Consulting Limited | Professional & scientific | 2017 |
| Limebush Close Limited | Households | 1983 |
| Limit Group Trade Ltd | Construction | 2026 |
| Linework Solutions Ltd | Professional & scientific | 2010 |
| Linstead Consulting Limited | Information & communication | 2012 |
| Lion House Film Services Limited | Information & communication | 2014 |
| Lion ORE Ltd | Mining & quarrying | 2017 |
| Liquid Assets Ltd. | Wholesale & retail | 2018 |
| Lisa Harris Plant Science Skin Care Limited | Wholesale & retail | 2021 |
| Listen to ME Counselling Service Ltd | Other services | 2015 |
| Little Miss PR Limited | Professional & scientific | 2017 |
| Little Nell Limited | Real estate | 2007 |
| Little Raccoons Day Nursery (Apsley) Limited | Education | 2014 |
| Little Raccoons Day Nursery (Chesham) Limited | Health & social care | 2017 |
| Little Raccoons Day Nursery (Coulsdon) Limited | Education | 2018 |
| Little Raccoons Day Nursery (Elstree) Limited | Health & social care | 2020 |
| Little Raccoons Day Nursery (Finchley) Limited | Health & social care | 2021 |
| Little Raccoons Day Nursery (Fitzrovia) Limited | Health & social care | 2022 |
| Little Raccoons Day Nursery (Pinner) Limited | Education | 2014 |
| Little Raccoons Day Nursery (Weybridge) Limited | Health & social care | 2023 |
| Little Raccoons Day Nursery Limited | Education | 2011 |
| Little Raccoons Nursery Limited | Education | 2012 |
| Little Sundry Ltd | Wholesale & retail | 2022 |
| Little Wish List Limited | Wholesale & retail | 2017 |
| Livehouse Limited | Real estate | 2001 |
| Living Media Events Limited | Administrative & support | 2017 |
| Livingwallz Ltd | Administrative & support | 2015 |
| Livogo Ltd | Professional & scientific | 2016 |
| LIZ Arnold-Smith Associates Limited | Professional & scientific | 2000 |
| LJC Tiling Perfection Ltd | Construction | 2019 |