| Linden Capital Assets Limited | Professional & scientific | 2010 |
| Linden Enterprises Limited | Real estate | 2007 |
| Linden Organisation Limited | Professional & scientific | 2005 |
| Lindley Forklift Training Limited | Education | 2013 |
| Lineplus Solution Limited | Manufacturing | 2014 |
| Link My Ride Ltd | Information & communication | 2021 |
| Link Network Solutions Ltd | Information & communication | 2025 |
| Linkdeal IO Ltd | Information & communication | 2024 |
| Linnco Limited | Wholesale & retail | 1983 |
| Lion Archive Limited | Transport & logistics | 2025 |
| Lion Eyes Ltd | Transport & logistics | 2023 |
| Lioness Security Limited | Administrative & support | 2024 |
| Liquid Commodity Solutions Limited | Wholesale & retail | 2026 |
| Liquid Control Ltd. | Manufacturing | 2014 |
| Lisa Benge Psychotherapy Limited | Health & social care | 2021 |
| Lister Property Company Ltd | Real estate | 2019 |
| Litterit Limited | Information & communication | 2017 |
| Little Doris Association Limited | Health & social care | 2023 |
| Little Doris Company Limited | Manufacturing | 2012 |
| Little Europe Northampton Ltd | Wholesale & retail | 2018 |
| Little Italy W Ltd | Hospitality | 2026 |
| Little Loonies Ltd | Other services | 2025 |
| Little Stars Care Service Ltd | Health & social care | 2023 |
| Live Better Locations Limited | Information & communication | 2010 |
| Livelocal Limited | Information & communication | 2009 |
| Living Grace Church | Other services | 2015 |
| Liviu Baican Transport Ltd | Wholesale & retail | 2021 |
| Lizphil Ltd | Wholesale & retail | 2023 |
| LJP LED Lighting Ltd | Wholesale & retail | 2025 |
| Llewellyn (Safety Advisors) Europe Ltd | Professional & scientific | 2005 |
| LMA Electrical Multitraders Ltd | Construction | 2026 |
| Lmjm Cars Limited | Wholesale & retail | 2018 |
| LMR Building Supplies Limited | Wholesale & retail | 2018 |
| LMR Timber Supplies Limited | Wholesale & retail | 2023 |
| Lnrlw Ltd | Other services | 2016 |
| Lockwood Hvac Limited | Construction | 2023 |
| Locs and Beauty Ltd | Other services | 2024 |
| Lofthaus Limited | Construction | 2013 |
| Logime Ltd | Transport & logistics | 2018 |
| Logue Homes Limited | Construction | 2015 |
| Loki Heavy Haulage Ltd | Construction | 2024 |
| LOM Estates Ltd | Real estate | 2024 |
| Londis Pension Trustees Limited | Administrative & support | 2015 |
| Londis(Holdings)Limited | Wholesale & retail | 1959 |
| London & Northern Estates Co Limited(The) | Financial services | 1964 |
| London Academy of Art and Design Ltd | Extraterritorial | 2025 |
| London Academy of Art Ltd | Professional & scientific | 2024 |
| Londonize Ltd | Wholesale & retail | 2022 |
| Long Marsh Limited | Administrative & support | 1956 |
| Longknight Ltd | Transport & logistics | 2024 |
| Lonsdale Office Solutions Limited | Wholesale & retail | 2023 |
| Lonsdale Print Solutions Limited | Manufacturing | 1917 |
| Lords Development Ltd | Construction | 2025 |
| Lorry Pro Construction Ltd | Construction | 2024 |
| Lottstone LLP | | 2017 |
| Lotus Phama UK Ltd | Professional & scientific | 2025 |
| Lotys Accommodation Ltd | Hospitality | 2022 |
| Lotys Properties Ltd | Real estate | 2022 |
| Louise Green Ltd | Other services | 2016 |
| Loup Digital Marketing Limited | Professional & scientific | 2025 |
| Love 2 Shop Boutique Ltd | Wholesale & retail | 2015 |
| Love Your Look Limited | Other services | 2010 |
| LOW Farm Equestrian Ltd | Agriculture & fishing | 2021 |
| Lowen Music Limited | Arts & recreation | 2023 |
| Lowflow Ltd | Construction | 2019 |
| Lowry Lighting Solutions Ltd | Construction | 2005 |
| Loyal Healthcare Ltd | Health & social care | 2014 |
| LPH Elite Roofing Ltd | Construction | 2024 |
| LPM Property Rentals Ltd | Real estate | 2015 |
| LSR Innovations Ltd | Construction | 2022 |
| LTN Catering Limited | Hospitality | 2024 |
| LU & Co Transport Ltd | Transport & logistics | 2015 |
| Lucatalia Properties Ltd | Extraterritorial | 2025 |
| Luccars Ltd | Manufacturing | 2024 |
| Lucent Home Care CIC | Health & social care | 2025 |
| Lucie Downer Performing Arts Ltd | Arts & recreation | 2019 |
| Lucky Dragon Trading Limited | Hospitality | 2015 |
| Lucy Francesca Limited | Extraterritorial | 2017 |
| Lujaynana Nigeria Jollof Rice Ltd | Hospitality | 2024 |
| Luluna Ltd | Wholesale & retail | 2018 |
| Lumora Kitchen Ltd | Hospitality | 2026 |
| Lumynara Ltd | Transport & logistics | 2024 |
| Luna&Lily Limited | Professional & scientific | 2025 |
| Lunarcloud Ltd | Information & communication | 2021 |
| Lusean Properties Limited | Real estate | 2026 |
| Luxe Beauty Hair Ltd | Wholesale & retail | 2026 |
| Luxe Concept Limited | Hospitality | 2023 |
| Luxury Nails 05 Ltd | Other services | 2023 |
| Luxury Nails 12 Ltd | Other services | 2024 |
| Luxy Transport Limited | Wholesale & retail | 2026 |
| LV Cabs Ltd | Transport & logistics | 2024 |
| LV Trans Ltd | Transport & logistics | 2019 |
| LVM Transport Ltd | Transport & logistics | 2019 |
| Lychee and Kale Ltd | Other services | 2019 |
| Lycrys Ltd | Transport & logistics | 2018 |
| Lynx Fencing Ltd | Extraterritorial | 2025 |
| Lyonheir Holdings Ltd | Wholesale & retail | 2018 |
| M & D Plumbing Limited | Construction | 2014 |
| M & K Window Installations Ltd | Construction | 2017 |
| M & L Construction & Maintenance Limited | Construction | 2006 |