| LJM Company Ltd | Health & social care | 2015 |
| LJV Solutions Limited | Professional & scientific | 2021 |
| LK Echo Ltd | Extraterritorial | 2016 |
| Llid Ltd | Transport & logistics | 2023 |
| Llimoxy Balmy Limited | Wholesale & retail | 2025 |
| LLM Acting Ltd | Information & communication | 2025 |
| LLM Holdings & Investments Ltd | Financial services | 2025 |
| Llmg Holdings Ltd | Financial services | 2026 |
| LLR Canetown Ltd | Transport & logistics | 2015 |
| LM Drainage Solutions Ltd | Water & waste | 2025 |
| LM29 Ltd | Wholesale & retail | 2026 |
| Lmgb Limited | Real estate | 2019 |
| LMR TM Ltd | Construction | 2024 |
| Loaded Crust Ltd | Hospitality | 2026 |
| Local Kebabs Limited | Hospitality | 2025 |
| Local Pizza and Kebab Limited | Hospitality | 2025 |
| Localrun (Building) Limited | Real estate | 2012 |
| Lockable 24/7 Locksmiths Limited | Administrative & support | 2015 |
| Lockfast Adhesives Limited | Professional & scientific | 1993 |
| Lodge 8 Ltd | Financial services | 2024 |
| Lodge Parking Limited | Transport & logistics | 2017 |
| Lodgefield Electrical Limited | Extraterritorial | 2008 |
| Log-It Software Limited | Information & communication | 2024 |
| Lolka Butique Ltd | Wholesale & retail | 2021 |
| Lolla's Kitchen Ltd | Wholesale & retail | 2023 |
| London Pathway School Limited | Education | 2022 |
| Lonely Globe Ltd | Wholesale & retail | 2025 |
| Loobys Designer Bargains Ltd | Wholesale & retail | 2024 |
| Lorella Aesthetics Limited | Manufacturing | 2021 |
| Lotus Construction Services Ltd | Construction | 2024 |
| Love Fasteners Ltd | Manufacturing | 2015 |
| Love Grassroots Ltd | Wholesale & retail | 2024 |
| Love Internal and Care Limited | Health & social care | 2024 |
| Love Rattan Furniture Ltd | Wholesale & retail | 2020 |
| Love Your Home Ltd | Administrative & support | 2026 |
| Lovely Little Treats Ltd | Wholesale & retail | 2020 |
| Lovetholan Limited | Health & social care | 2016 |
| Lower Hartshay Ltd | Administrative & support | 2022 |
| Lowki.Ai Limited | Information & communication | 2025 |
| LP SD Forty Limited | Wholesale & retail | 2023 |
| LP SD Thirty Eight Limited | Wholesale & retail | 2023 |
| LP SD Thirty Five Limited | Wholesale & retail | 2023 |
| LP SD Thirty Nine Limited | Wholesale & retail | 2023 |
| LP SD Thirty SIX Limited | Wholesale & retail | 2023 |
| LPK Bodyshop Ltd | Wholesale & retail | 2015 |
| LR Parr Ltd | Construction | 2022 |
| Lrph Events Ltd | Hospitality | 2024 |
| LSA Development Holdings Ltd | Real estate | 2024 |
| Lsfs-Ac UK Limited | Professional & scientific | 2022 |
| LSR Site Services Ltd | Administrative & support | 2019 |
| LST Holdings and Investments Ltd | Financial services | 2025 |
| LST Transport Ltd | Transport & logistics | 2025 |
| Luchiz Beauty Ltd | Other services | 2024 |
| Lucid Pursuit Group (LP Social) Ltd | Financial services | 2025 |
| Lucid Pursuit Social Connection Ltd | Extraterritorial | 2025 |
| Lucrum Capital Holdings Limited | Professional & scientific | 2024 |
| Luke Martin Coachworks Limited | Wholesale & retail | 2022 |
| Lumberjack Tools Ltd | Wholesale & retail | 2017 |
| Lumina Global Media Ltd | Information & communication | 2025 |
| Lumleys Florist Limited | Wholesale & retail | 2010 |
| Lunch on the Run Limited | Administrative & support | 1999 |
| Lune Luxe Ltd | Other services | 2025 |
| Lurenni Ltd | Information & communication | 2026 |
| Luxe Beauty & Home Solutions Limited | Wholesale & retail | 2024 |
| Luxury Holidays Cornwall Ltd | Real estate | 2019 |
| Luxury LOG Burners Ltd | Construction | 2023 |
| Luxury Valeting Services Ltd | Other services | 2017 |
| LVW Beauty Academy Ltd | Extraterritorial | 2015 |
| Lwan Ltd | Wholesale & retail | 2021 |
| LWC Children's Services Limited | Public administration | 2024 |
| LWR Cleaning Services Ltd | Administrative & support | 2020 |
| Lyde Court Limited | Real estate | 2006 |
| Lymo Tech Ltd | Information & communication | 2025 |
| Lymphcare UK CIC | Health & social care | 2011 |
| Lyna Nails Limited | Other services | 2021 |
| Lynner Consulting Limited | Health & social care | 2014 |
| Lynsey Parkes Cardiac Physiologist Limited | Health & social care | 2023 |
| Lynx Engineering Ltd | Construction | 2006 |
| Lyrico Limited | Information & communication | 2011 |
| Lyttelton Framing Gallery Limited | Other services | 2026 |
| M & G Sheds Ltd | Other services | 2018 |
| M & J Bahri Limited | Wholesale & retail | 2013 |
| M & J Welding (2011) Ltd | Administrative & support | 2009 |
| M & K Metals Limited | Extraterritorial | 2011 |
| M & MI Limited | Real estate | 2018 |
| M & N Propco Limited | Real estate | 2025 |
| M & N Properties Holdings Limited | Financial services | 2025 |
| M & N Wholesalers Limited | Real estate | 1991 |
| M & S Commercial Property Investments Ltd | Real estate | 2023 |
| M & T Electrical Ltd | Construction | 2023 |
| M a Heating and Electrical Limited | Construction | 2021 |
| M Baines Utilities Ltd | Construction | 2023 |
| M Bari & Sons Ltd | Hospitality | 2024 |
| M Cooper Motor Repairs Limited | Wholesale & retail | 2006 |
| M D Flat Roofing Ltd | Construction | 2024 |
| M E Services 2020 Ltd | Transport & logistics | 2020 |
| M H a J Ltd | Real estate | 2026 |
| M Hales & SON Limited | Transport & logistics | 2015 |
| M J Hayward Associates Limited | Professional & scientific | 2007 |
| M JAY Estates Limited | Real estate | 1985 |