| Lets MIX Bars Ltd | Hospitality | 2022 |
| Let’S MIX Ltd | Wholesale & retail | 2021 |
| Levels Hair Studios Ltd | Other services | 2025 |
| Leveluplifetdy Ltd | Households | 2025 |
| Lewis & Company (Financial Management) Limited | Professional & scientific | 2000 |
| Lewis Harrison Estates Ltd | Real estate | 2025 |
| Lewis Jenkins Limited | Information & communication | 2025 |
| Lewis Till Limited | Financial services | 2011 |
| Lewiston Studios Limited | Information & communication | 2024 |
| Lewis’S Food Hall Ltd | Wholesale & retail | 2025 |
| LG Consultancy Services Ltd | Financial services | 2023 |
| LHC Project Management Limited | Professional & scientific | 2025 |
| LI Productions Ltd | Information & communication | 2025 |
| Liberta Consult Limited | Professional & scientific | 2023 |
| Life Christchurch Limited | Health & social care | 2019 |
| Light Contrast Limited | Arts & recreation | 2015 |
| Lilliput Retreats Ltd | Hospitality | 2024 |
| Lilly Rose Developments Ltd | Construction | 2023 |
| Lily Promotions Ltd | Information & communication | 2018 |
| Lima Charlie Bravo Property Ltd | Real estate | 2025 |
| Limbo Pictures Ltd | Information & communication | 2016 |
| Lindenburn Logistics Ltd | Transport & logistics | 2020 |
| Linear Vision Ltd | Information & communication | 2011 |
| Lines & Company Ltd | Professional & scientific | 2017 |
| Lineup Enterprises Limited | Professional & scientific | 2011 |
| Lineup Media Limited | Extraterritorial | 2010 |
| Linkfirst Limited | Wholesale & retail | 2014 |
| Listening Heart Consultancy Ltd | Education | 2022 |
| Little Bear Woods CIC | Education | 2025 |
| Little Dahlings Ltd | Arts & recreation | 2021 |
| Liutrendy Fashion Hub Limited | Wholesale & retail | 2025 |
| Liver Building Ltd | Construction | 2018 |
| Livy VH Limited | Professional & scientific | 2014 |
| Loadmaster Logistics Ltd | Transport & logistics | 2016 |
| Local Deli Ltd | Hospitality | 2025 |
| Local Jobs Direct Limited | Administrative & support | 2022 |
| Local Jobs.Com (UK) Limited | Other services | 2017 |
| Localdigitalmarketing.Com Ltd | Professional & scientific | 2009 |
| Logical Business Ltd | Information & communication | 2016 |
| Logicforge Solutions Limited | Information & communication | 2025 |
| Logobugs Limited | Professional & scientific | 1996 |
| London IVF and Genetics Limited | Health & social care | 2014 |
| Lookci Ltd | Information & communication | 2022 |
| Lord Bute Ltd | Hospitality | 2021 |
| Love Child Care Limited | Administrative & support | 2024 |
| Love Organic Limited | Wholesale & retail | 2003 |
| Love Your Home Installations Ltd | Construction | 2024 |
| Lovegrove Financial Solutions Ltd | Financial services | 2020 |
| Lowe’S Shipwrights Ltd | Manufacturing | 2021 |
| Lowie Holdings Limited | Financial services | 2024 |
| Lowie Properties Limited | Real estate | 2024 |
| LRB Therapy Limited | Other services | 2022 |
| LRG Global Limited | Financial services | 2026 |
| LSP Sports Management Ltd | Professional & scientific | 2022 |
| Ludbrook Services Ltd | Administrative & support | 2014 |
| Luke English Media Law Limited | Professional & scientific | 2020 |
| Lukodzi Ltd | Professional & scientific | 2021 |
| Lume-Hr Ltd | Information & communication | 2025 |
| Lumin Social Ltd | Other services | 2025 |
| Luneus International Limited | Administrative & support | 2011 |
| Luneus Limited | Administrative & support | 2011 |
| Luno Systems Ltd | Manufacturing | 2012 |
| Lymington Yachting Limited | Arts & recreation | 2003 |
| Lyndhurst Park Management Limited | Households | 2024 |
| Lyte Drive Ltd | Manufacturing | 2021 |
| M & a Tollman Holdings Ltd | Households | 2025 |
| M & M (Christchurch ) Ltd | Professional & scientific | 2016 |
| M C a Aviation Limited | Professional & scientific | 2004 |
| M E P Barry (Holdings) Ltd | Real estate | 2017 |
| M Lockyer Electrical Limited | Construction | 2003 |
| M R Consultancy (Dorset) Limited | Professional & scientific | 2024 |
| M W Sales & Marketing Limited | Financial services | 2005 |
| M. Lockyer Ltd | Manufacturing | 2018 |
| M.R.N Body Blueprint Limited | Arts & recreation | 2026 |
| M18 Consulting Ltd | Information & communication | 2022 |
| M18 Enterprises Ltd | Financial services | 2022 |
| Maap Consultants Ltd | Construction | 1994 |
| MAC in the Box Ltd | Manufacturing | 2025 |
| Macdona Property Company Limited | Hospitality | 1945 |
| Machine Doctor Ltd | Professional & scientific | 2021 |
| MAD COW Investments Ltd | Real estate | 2024 |
| Made 2 Measure Fitted Furniture Limited | Manufacturing | 2003 |
| Madegood Limited | Wholesale & retail | 2025 |
| Magg Galaxy Limited | Information & communication | 2026 |
| Magnitude Electrical Services Ltd | Construction | 2023 |
| Mahmatli Limited | Wholesale & retail | 2025 |
| Mahoney Scaffolding and Roofing Ltd | Construction | 2025 |
| Maison Rayne Limited | Wholesale & retail | 2024 |
| Maison Sera Limited | Administrative & support | 2025 |
| Make Photography LLP | | 2021 |
| Makro Organics UK Ltd | Water & waste | 2024 |
| Mallet & Brush Ltd | Construction | 2020 |
| Maltings Management (Poole) Limited (the) | Households | 1972 |
| Manderley Management Limited | Households | 1976 |
| Manky Dog Ltd | Manufacturing | 2011 |
| Manning Avenue Properties Limited | Hospitality | 2013 |
| Manta Makes Gifts Limited | Manufacturing | 2025 |
| Maples Label Limited | Manufacturing | 2025 |
| Mapt. on Demand Liquidity Ltd | Administrative & support | 2020 |
| MAR Industries Limited | Administrative & support | 2026 |