| Laura Lian Statues Limited | Other services | 2018 |
| Lavender BEE Farm Limited | Other services | 2021 |
| Lavender Lane Ltd | Wholesale & retail | 2011 |
| Lawpool Court Management Company Limited | Households | 1991 |
| Lcmc Consulting Ltd | Professional & scientific | 2023 |
| Leaf Property Services (Client Holdings) Limited | Extraterritorial | 2019 |
| Leaf Property Services Limited | Real estate | 2012 |
| Lear Land & New Homes Limited | Real estate | 2007 |
| Learn FOX Ltd | Information & communication | 2017 |
| Lechmere Nominees Limited | Extraterritorial | 1998 |
| LEE a. Dodd Ltd | Construction | 2015 |
| LEH Productions Limited | Information & communication | 2020 |
| Leigh Farm Administration Ltd | Real estate | 2015 |
| Leon Bailey Limited | Transport & logistics | 1998 |
| Level 7 Consulting Ltd | Information & communication | 2014 |
| LH Spa & Wellness Ltd | Other services | 2025 |
| LH Talent Solutions Limited | Administrative & support | 2022 |
| Lievito Ltd | Manufacturing | 2012 |
| Lifesystems Limited | Professional & scientific | 2002 |
| Lightning Mortgages Ltd | Financial services | 2025 |
| Lindall Properties Limited | Construction | 2008 |
| Linden Tree Conservation Limited | Construction | 2011 |
| Linear Ventures Ltd | Wholesale & retail | 2020 |
| Link 4 Developments Limited | Real estate | 2008 |
| Lioncorp-Craneparts Ltd | Wholesale & retail | 2021 |
| Lippeatts Limited | Manufacturing | 1995 |
| Liquid Design Solutions Limited | Professional & scientific | 2009 |
| Liquid Visions Ltd | Manufacturing | 2026 |
| Litetile Limited | Wholesale & retail | 2011 |
| Lizardlogic Ltd. | Information & communication | 2012 |
| Lloyd's Property Holdings Limited | Real estate | 2016 |
| Lloyds Property Developments Limited | Real estate | 2021 |
| Lockyer's Bees Ltd | Agriculture & fishing | 2023 |
| Lodestone Estate Agents Limited | Real estate | 2016 |
| London House (Wells) Limited | Wholesale & retail | 2019 |
| Long Story Ltd | Hospitality | 2022 |
| Longcross East Studios Limited | Financial services | 2024 |
| Longcross Serious Studios Limited | Real estate | 2021 |
| Longcross South Studios Limited | Extraterritorial | 2022 |
| Longpre Cabinet Makers Limited | Financial services | 2011 |
| Longpre Limited | Manufacturing | 1998 |
| Lord Howson Ltd | Real estate | 2022 |
| Lothlorien Developments Limited | Construction | 2015 |
| Lovington Agricultural Services Limited | Manufacturing | 2005 |
| Lovington Bakery Limited | Extraterritorial | 2015 |
| LP Performing Arts LLP | | 2023 |
| Lucas-Chave Dermatology Limited | Other services | 2010 |
| Lucy Payne Performing Arts Ltd | Education | 2014 |
| Luminous Construct Ltd | Construction | 2025 |
| Luna 3-6-5 Healthcare Services Ltd | Public administration | 2021 |
| Luxe and Twine Interiors Limited | Wholesale & retail | 2015 |
| Lydstep Nursery Ltd | Real estate | 2021 |
| Lynda's Loaf Ltd | Hospitality | 2013 |
| Lynnsey Kelly Flowers Limited | Wholesale & retail | 2013 |
| Lynx Media Ltd | Manufacturing | 2011 |
| Lyonsleaf Ltd | Manufacturing | 2015 |
| M & J Investment Solutions Limited | Professional & scientific | 2011 |
| M Higgins Drylining Ltd | Construction | 2014 |
| M J Lambert Building Services Ltd | Construction | 2009 |
| M J Sheppard Funeral Directors Ltd | Other services | 2013 |
| M P Hilton Medical Ltd | Health & social care | 2018 |
| M. R. S Audit Solutions Limited | Professional & scientific | 2024 |
| M.G. Limond (Land) Co. Limited | Real estate | 1994 |
| M5 Data Limited | Manufacturing | 2002 |
| M8 International Events Limited | Professional & scientific | 2022 |
| MAC Wizard Limited | Wholesale & retail | 2013 |
| Machin & Machin Limited | Wholesale & retail | 2017 |
| Madel Property Ltd | Real estate | 2025 |
| Magdalena Dyka Limited | Administrative & support | 2017 |
| Magic Circus Ltd | Professional & scientific | 1988 |
| Magique Ltd | Arts & recreation | 2009 |
| Makita Financial Services Limited | Professional & scientific | 2024 |
| Managed Print Services Limited | Information & communication | 2008 |
| Marcus Hogg Ecology Ltd | Professional & scientific | 2023 |
| Maria Darby-Walker Ltd | Professional & scientific | 2012 |
| Marine Renewable Engineering Ltd | Professional & scientific | 2017 |
| Maritime Cranes and Components Ltd | Manufacturing | 2019 |
| Mark Cairns Landscapes Ltd | Administrative & support | 2019 |
| Mark Griffiths Properties Limited | Real estate | 2018 |
| Mark Obrien Ltd | Manufacturing | 2020 |
| Market Street Antiques and Interiors Ltd | Wholesale & retail | 2012 |
| Marketing Experience Limited | Information & communication | 2010 |
| Marshfield and Buckley Ltd | Other services | 2026 |
| Martin Hares Agri Services Limited | Agriculture & fishing | 2011 |
| Martini Investments SW Limited | Construction | 2019 |
| MAT Finishing & Fixings Ltd | Administrative & support | 2017 |
| Matt Jelfs Consultancy Limited | Information & communication | 2013 |
| MAX Pro Painter Ltd | Administrative & support | 2019 |
| Mayproco Limited | Real estate | 2025 |
| Mcah Consultancy Limited | Professional & scientific | 2024 |
| MCB Investments Limited | Administrative & support | 2007 |
| MD Agricultural Services Limited | Agriculture & fishing | 1997 |
| ME Time Ventures Limited | Construction | 2024 |
| Meadow House Limited | Real estate | 2024 |
| Meadowsweet Kitchen Ltd | Hospitality | 2012 |
| Mechanical House Limited | Financial services | 2022 |
| Mechanical Mouse Limited | Information & communication | 2013 |
| Mechanova Ltd | Manufacturing | 2011 |
| Meehan Building Ltd | Construction | 2016 |
| Melbourne House Mews (Wells) Management Company Limited | Households | 1994 |