| L & M Securities Limited | Financial services | 1989 |
| L.Simpson Plumbing & Heating Limited | Construction | 2024 |
| LA Belle Hair and Beauty Salon Ltd | Other services | 2017 |
| LA Heat Limited | Other services | 2019 |
| Laing Property Investments Limited | Professional & scientific | 2010 |
| Lakewood Ventures Ltd | Financial services | 2025 |
| Lambs Green Limited | Construction | 2019 |
| Lamwell Holdings Limited | Wholesale & retail | 2013 |
| Lamwell Motor Co Ltd | Wholesale & retail | 2002 |
| Land & Wave Training Ltd | Financial services | 2026 |
| Lankage Care Limited | Administrative & support | 2023 |
| Lanmak and Sons Ltd | Health & social care | 2025 |
| Lansdowne Woodward Financial Services Limited | Financial services | 2003 |
| Lansdowne Woodward Limited | Financial services | 2002 |
| Largo Limited | Extraterritorial | 2000 |
| Lathikka Ltd | Wholesale & retail | 2017 |
| Laura Wood Hair Loss Clinic Limited | Other services | 2026 |
| LB Content Creation Limited | Professional & scientific | 2026 |
| LCC Governance Limited | Professional & scientific | 2022 |
| LDM Aero Limited | Transport & logistics | 2013 |
| Leapchallen Limited | Real estate | 1987 |
| Learnstack Ltd | Information & communication | 2023 |
| Leclef Ltd | Professional & scientific | 2018 |
| Leclef Sardal Dubai Chocolates Ltd | Professional & scientific | 2022 |
| Led-Zip Lighting Limited | Wholesale & retail | 2008 |
| Legacy Machine Services Limited | Manufacturing | 2022 |
| Lemon Tree Training Academy Ltd | Education | 2010 |
| Lester Property Group Limited | Real estate | 2019 |
| Letzprotect Property Inspections Ltd | Real estate | 2013 |
| Lewis White Limited | Information & communication | 2005 |
| Lewis William Investments Limited | Construction | 2020 |
| LIB Holdco 2022 Ltd | Professional & scientific | 2022 |
| Liberty James Studio Ltd | Wholesale & retail | 2022 |
| Lifedriveuk Limited | Education | 2018 |
| Lifestyle Gains Limited | Arts & recreation | 2020 |
| Light Visualisation Limited | Real estate | 2023 |
| Liink Ltd | Construction | 2024 |
| Lilliput Investments Ltd | Real estate | 2012 |
| Limarus Ltd | Professional & scientific | 2009 |
| Lime Coast Catering Ltd | Hospitality | 2024 |
| Linaria & Vine Ltd | Wholesale & retail | 2019 |
| Lion Works Studios Limited | Information & communication | 2020 |
| Litpo Holding Ltd | Real estate | 2025 |
| Little Lindens Lettings Ltd | Real estate | 2025 |
| Littleblackdress Ltd | Administrative & support | 2023 |
| Livonia Productions Ltd | Information & communication | 2000 |
| LK Control Systems Ltd | Manufacturing | 2015 |
| Lockwise Mobile Locksmith Limited | Wholesale & retail | 1999 |
| Logik Copying Systems Limited | Wholesale & retail | 1996 |
| Lolligo Ltd | Construction | 2017 |
| London Lounge Limited | Wholesale & retail | 1998 |
| Longham Farm Management Company Limited | Households | 2012 |
| Longham Property Investments LLP | | 2011 |
| Longview Strategic Holdings Limited | Financial services | 2026 |
| Lotus Press Limited | Manufacturing | 1998 |
| Lotus Thai Massage & Spa Limited | Health & social care | 2022 |
| Lotus Thai Massage & Spa Minehead Limited | Health & social care | 2022 |
| Lotus Thai Massage & Spa Taunton Limited | Health & social care | 2023 |
| Love Anousta Limited | Wholesale & retail | 2018 |
| Loxwood (Ferndown) Management Limited | Real estate | 2008 |
| LP Medical (Services) Limited | Health & social care | 2014 |
| LPR Automotive Ltd | Wholesale & retail | 2025 |
| LRB Technology Ltd | Information & communication | 2017 |
| Lrcp Ltd | Professional & scientific | 2024 |
| LS Ventures Limited | Administrative & support | 2025 |
| LSW Developments Ltd | Real estate | 2025 |
| Luff Brook Carter Limited | Professional & scientific | 2008 |
| Lumen Developments Ltd | Construction | 2025 |
| Lumiis Properties Ltd | Real estate | 2018 |
| Lumina Luxe Beauty Ltd | Wholesale & retail | 2026 |
| Lunaflow Limited | Arts & recreation | 2024 |
| Luxe Mangment Limited | Hospitality | 2024 |
| Luxe Motor Group Poole Ltd | Wholesale & retail | 2019 |
| Luxelocks Ltd | Other services | 2026 |
| Lyndon Court Management Company Limited | Real estate | 2010 |
| M & a Transport Limited | Transport & logistics | 2017 |
| M & S Mouldings Ltd | Construction | 2015 |
| M N Carpentry & Building Ltd | Construction | 2018 |
| M&Cw Limited | Financial services | 2025 |
| M4C Attire Ltd | Wholesale & retail | 2024 |
| Mabey Francis Limited | Professional & scientific | 2008 |
| Made With Coffee Limited | Information & communication | 2017 |
| Madgewick Ltd | Professional & scientific | 2017 |
| Mainchannel Developments Limited | Construction | 2015 |
| Malgo Management Services Limited | Professional & scientific | 2018 |
| Mallard Enterprises Limited | Arts & recreation | 2010 |
| Malpasso Consultancy Ltd | Administrative & support | 2007 |
| Management and Marketing Initiatives Limited | Professional & scientific | 1993 |
| Mandrax UK Ltd | Financial services | 2019 |
| Manufacturing Envision Ltd | Manufacturing | 2018 |
| Maranatha Christian Church | Other services | 2010 |
| Marianne Limited | Professional & scientific | 2017 |
| Mark Catton Associates Ltd | Professional & scientific | 2025 |
| Mark Catton Limited | Professional & scientific | 2013 |
| Markee Limited | Other services | 2014 |
| Maroc Secret Ltd | Wholesale & retail | 2024 |
| Martial Sports Network Limited | Arts & recreation | 2015 |
| Mascots Inc Limited | Manufacturing | 2019 |
| Match Marketing Services Ltd | Administrative & support | 2017 |
| Matrix Peripheral Services Limited | Other services | 2001 |