| LFM Advisory Ltd | Professional & scientific | 2023 |
| Liberty Island Ltd | Financial services | 2023 |
| Life and Health Ltd | Information & communication | 2014 |
| Lifecybernetics UK Ltd | Information & communication | 2020 |
| Light Bearer Media Ltd | Information & communication | 2025 |
| Lighterman Limited | Transport & logistics | 2012 |
| Lighthouse Tavern Ltd | Hospitality | 2020 |
| Lightway Daylight Ltd | Construction | 2014 |
| Lilly Locks Academy Ltd | Other services | 2025 |
| Lily Innovation Advisors Limited | Professional & scientific | 2009 |
| Lily Jacobs Ltd | Wholesale & retail | 2021 |
| Lilyhana Limited | Wholesale & retail | 2025 |
| Lindsay Commercial Limited | Real estate | 2025 |
| Line Dance Fit Ltd | Education | 2026 |
| Lingfield Equine Ltd | Professional & scientific | 2008 |
| Lingfield Equine Holdings Limited | Financial services | 2023 |
| Lingfield Football Club Ltd | Education | 2015 |
| Lingfield Property Limited | Real estate | 2025 |
| Link House (Ashurst Wood) Limited | Households | 2018 |
| Linq Consulting & Management Ltd | Professional & scientific | 2018 |
| LIT 19 Ltd | Wholesale & retail | 2019 |
| Lithgow Nelson & Co Limited | Professional & scientific | 2012 |
| Little Cottage Consultancy Limited | Information & communication | 2002 |
| Little Gemz Limited | Education | 2016 |
| Little Orchard Consultants Ltd | Professional & scientific | 2020 |
| Little X Legacy Ltd | Manufacturing | 2024 |
| Live Better Ltd | Wholesale & retail | 2013 |
| Live Blinds Ltd | Wholesale & retail | 2023 |
| Liverpool Property Developers Ltd | Extraterritorial | 2017 |
| Livoa Vital Limited | Health & social care | 2014 |
| LIZ & M Group Ltd | Wholesale & retail | 2024 |
| LK Assets Limited | Real estate | 2025 |
| Lloyd Recruitment Services Limited | Administrative & support | 1995 |
| Locharidge Holdings Limited | Professional & scientific | 2012 |
| Logical Content Ltd | Wholesale & retail | 2007 |
| London DBT Therapists Ltd | Other services | 2021 |
| Longwall Court Management Limited | Households | 2007 |
| Loof Limited | Wholesale & retail | 2022 |
| Lotus Active Ltd | Professional & scientific | 2025 |
| Lotus Group Properties Ltd | Real estate | 2023 |
| Loup Vert International Law Ltd | Professional & scientific | 2024 |
| Lovat Lane Residences LLP | | 2024 |
| Love Letters Publishing Limited | Information & communication | 2013 |
| Lower Mere East Grinstead Residents Company Limited | Households | 1983 |
| LP Agriculture (Services) Limited | Agriculture & fishing | 2019 |
| LP Rhodes Ltd | Arts & recreation | 2025 |
| LPS Law Ltd | Education | 2021 |
| LS Properties (EG) Limited | Real estate | 2025 |
| Lucie Garside Ltd | Professional & scientific | 2021 |
| Luke Bradley Ltd | Professional & scientific | 2025 |
| Lumin Property Ltd | Real estate | 2019 |
| Lumn Ltd | Wholesale & retail | 2026 |
| Lumora Properties Ltd | Real estate | 2025 |
| Luna Amoure Matresses Ltd | Wholesale & retail | 2025 |
| Lunar Light Laser Ltd | Health & social care | 2024 |
| Luongo Properties Ltd | Real estate | 2017 |
| Luxfords (Sussex) Ltd | Other services | 2025 |
| Luxhiny Professional Ltd | Real estate | 2026 |
| Luxor Strategies Ltd | Administrative & support | 2017 |
| Luxwood Group Ltd | Real estate | 2021 |
| Lvcl Ltd | Construction | 2024 |
| LVS HR Consultancy Limited | Administrative & support | 2014 |
| Lydd Properties Ltd | Real estate | 2010 |
| Lynden Business Services Limited | Professional & scientific | 2026 |
| Lyndhurst RES. Assoc. (Felbridge) Limited | Households | 1993 |
| Lynn Logistics Limited | Transport & logistics | 2025 |
| M & E B Developments Ltd | Real estate | 2007 |
| M & E B Property Ltd | Real estate | 2007 |
| M & P Jones Consulting Limited | Administrative & support | 2017 |
| M Bradford Brickwork Ltd | Construction | 2013 |
| M Hibbett Construction Limited | Construction | 2017 |
| M M Roofing Group Ltd | Construction | 2013 |
| M Pelling Brickwork Ltd | Construction | 2022 |
| M Toon Services Ltd | Construction | 2013 |
| M Valerio Healthcare Ltd | Health & social care | 2017 |
| MA & AM Investment Limited | Financial services | 2025 |
| MA & HA Ltd | Hospitality | 2024 |
| Maccounts Group Ltd | Construction | 2020 |
| Machovia International Limited | Financial services | 2020 |
| Machovia Technology Innovations Ltd | Information & communication | 2013 |
| Mack's Ices Limited | Hospitality | 2023 |
| Mackerel Sky Holdings Ltd | Financial services | 2021 |
| Mackerel Sky Leisure Ltd | Hospitality | 2019 |
| Mactivities Ltd | Wholesale & retail | 2013 |
| Magdi Bunt Ltd. | Professional & scientific | 2016 |
| Magenta Capital Limited | Professional & scientific | 2013 |
| Magic Hour Productions Limited | Information & communication | 2011 |
| Magistro Consulting Ltd | Professional & scientific | 2019 |
| Magnarex Ltd | Wholesale & retail | 2024 |
| Magnetite Global LLP | | 2014 |
| Magnolia Medical Technology Limited | Wholesale & retail | 2014 |
| Magnum Broker Ltd | Real estate | 2021 |
| MAJ Architects LLP | | 2012 |
| Majent Limited | Professional & scientific | 2020 |
| Major Asset Finance & Leasing Limited | Financial services | 2019 |
| Management Teams International Limited | Professional & scientific | 1990 |
| Mane Street Salon LLP | | 2025 |
| Mansell Mctaggart East Grinstead Limited | Real estate | 2012 |
| Mansoor and Sons Limited Limited | Wholesale & retail | 2025 |
| Mansys Limited | Information & communication | 1998 |