| Local Planning Services Limited | Professional & scientific | 2014 |
| Local Tanker Services Ltd | Administrative & support | 2020 |
| Local Will Storage Ltd | Other services | 2025 |
| Localfindz Ltd | Information & communication | 2025 |
| LOCATE3 Ltd | Information & communication | 2013 |
| Location Support Limited | Information & communication | 2014 |
| Locational Analysis Limited | Information & communication | 2020 |
| Lochore Enterprises Ltd | Real estate | 2019 |
| Lochwood Works Ltd | Professional & scientific | 2025 |
| Lock Electrical Limited | Construction | 1975 |
| Lockerbilly Limited | Arts & recreation | 2015 |
| Lockwood Surveying Consultancy Limited | Construction | 2024 |
| Locus Insight Limited | Extraterritorial | 2022 |
| Locus Planning Limited | Professional & scientific | 2015 |
| Locusta Holdings Limited | Financial services | 2025 |
| Lodestar Studios Ltd | Information & communication | 2026 |
| Lodge Lane 1 Limited | Professional & scientific | 2025 |
| Lodge Lane 2 Limited | Construction | 2025 |
| Lodge Park Business Centre Ltd | Extraterritorial | 2003 |
| Lodge Park Estates Ltd | Extraterritorial | 2003 |
| Loft Zone Limited | Administrative & support | 2011 |
| Logibritt Ltd | Wholesale & retail | 2025 |
| Logic Displays Ltd | Administrative & support | 2007 |
| Logic Facility Services Limited | Administrative & support | 2025 |
| Logical Logistics & Training Ltd | Transport & logistics | 2020 |
| Logika Holdings Limited | Administrative & support | 2018 |
| Logun Pillar Capital Ltd | Households | 2025 |
| Lokjaw Limited | Information & communication | 2014 |
| Lola Faith Construction Ltd | Construction | 2024 |
| LOLA2020 Ltd | Construction | 2020 |
| Lomas & Pigeon Ltd | Manufacturing | 2016 |
| London & Istanbul Limited Liability Partnership | | 2008 |
| London Ayur Medix Practitioners Ltd | Health & social care | 2024 |
| London Ceram Limited | Health & social care | 2012 |
| London City Antiques Limited | Wholesale & retail | 2020 |
| London Co Properties Ltd | Real estate | 2022 |
| London Debt Exchange Ltd | Information & communication | 2019 |
| London Fashion Services Limited | Administrative & support | 2004 |
| London Fire Extinguishers & Risk Assessments Limited | Extraterritorial | 2017 |
| London Lintels Limited | Construction | 2011 |
| London Management Consultant Training Limited | Construction | 2022 |
| London Management Qualifications Ltd | Education | 2013 |
| London Market Change Ltd | Professional & scientific | 2025 |
| London Photo Company Limited | Professional & scientific | 2005 |
| London Road Bakery Ltd | Wholesale & retail | 2023 |
| London Road Barbers Ltd | Other services | 2025 |
| London Theatre and Cabaret Workshop Limited | Arts & recreation | 2013 |
| London Tourist Guides Limited | Administrative & support | 2016 |
| London Upper GI Surgery Ltd | Health & social care | 2022 |
| London Wagyu Company Ltd | Wholesale & retail | 2022 |
| Long Melford Antiques Ltd | Real estate | 2007 |
| Longmeadow Widford LLP | | 2020 |
| Longridge Contracting Limited | Administrative & support | 1984 |
| Longs of London Limited | Real estate | 2014 |
| Longwyre Development Ltd | Real estate | 2022 |
| Longwyre Services Limited | Wholesale & retail | 2023 |
| Loni 02 Ltd | Hospitality | 2026 |
| Loofers Food & Coffee Co Ltd | Hospitality | 2016 |
| Look Garden Build Limited | Administrative & support | 2003 |
| Look Lush With LIV Ltd | Other services | 2025 |
| Look West Plus Limited | Other services | 2008 |
| Looksystems Ltd | Information & communication | 1998 |
| Loomes Plumbing and Heating Limited | Construction | 2006 |
| Loralex Ltd | Transport & logistics | 2019 |
| Loram Racing Ltd | Wholesale & retail | 2001 |
| Loratrad Ltd | Health & social care | 2015 |
| Lord Residential Limited | Real estate | 2006 |
| Lordven Properties Limited | Real estate | 2026 |
| Lorem Ipsum Limited | Professional & scientific | 2015 |
| Lotterly Ltd | Arts & recreation | 2026 |
| Lotus Analysis and Investment Company Ltd | Financial services | 2025 |
| Lotus Restaurant Ltd | Hospitality | 2023 |
| Loughton Chase Freehold Limited | Households | 2015 |
| Louise Margiotta Limited | Financial services | 2022 |
| Lourenco Ltd | Extraterritorial | 2021 |
| Love at First Swipe Ltd | Wholesale & retail | 2018 |
| Love French Interiors Ltd | Wholesale & retail | 2023 |
| Love Implants Ltd | Health & social care | 2025 |
| Love Life Retreats Ltd | Professional & scientific | 2023 |
| Love Local CIC | Wholesale & retail | 2025 |
| Love Love Ltd | Information & communication | 2019 |
| Love of GOD Gospel Ministry A.K.A Agape Chapel International C.I.C. | Other services | 2017 |
| Love Purple People Ltd | Health & social care | 2018 |
| Lovejoy Leisure Limited | Manufacturing | 2025 |
| Lovely House Ltd | Real estate | 2026 |
| Loves Skin Ltd | Other services | 2019 |
| Loveth Care Services Limited | Health & social care | 2019 |
| LOW Motive Ltd | Wholesale & retail | 2025 |
| Lowe Design and Construction Ltd | Construction | 2019 |
| Loxley Court (Sible Hedingham) Management Company Limited | Households | 2006 |
| Lozenge Logic Ltd | Information & communication | 2023 |
| LP and SM Knight Limited | Wholesale & retail | 2016 |
| LP Management Services Limited | Health & social care | 2008 |
| LPR Agency Ltd | Information & communication | 2021 |
| LR Contractors Limited | Construction | 2025 |
| LR Dasi Limited | Wholesale & retail | 2017 |
| LR8 Properties Ltd | Real estate | 2025 |
| LRC Associates Ltd | Financial services | 2022 |
| LRC Building and Carpentry Services Limited | Administrative & support | 2020 |
| Lrdf Solutions Ltd | Professional & scientific | 2023 |