| Love to EAT (Ormskirk) Limited | Hospitality | 2016 |
| Loveday International Limited | Wholesale & retail | 2018 |
| Low-Key Electrical Contractors Limited | Construction | 2023 |
| LPH Retail Limited | Wholesale & retail | 2020 |
| LRA Law Ltd | Professional & scientific | 2023 |
| LRD2026 Ltd | Health & social care | 2026 |
| LRT Lubricants Limited | Wholesale & retail | 2022 |
| Lubing (UK & Ireland) Limited | Manufacturing | 2008 |
| Luca Emilio Ltd | Real estate | 2019 |
| Lucky U 718 Ltd | Hospitality | 2024 |
| Lumsden Foods Ltd | Hospitality | 2020 |
| Luna Rose Investments Ltd | Households | 2023 |
| Lusso Hub Limited | Wholesale & retail | 2025 |
| Luxcarz Ltd | Wholesale & retail | 2024 |
| Luxury Holiday Parks Limited | Hospitality | 2017 |
| LVS Living Ltd | Real estate | 2018 |
| Lynch Derbyshire Limited | Transport & logistics | 2022 |
| Lyncroft Farm Limited | Agriculture & fishing | 2005 |
| Lynext Tech Ltd | Wholesale & retail | 2025 |
| Lyon Plumbing and Heating Limited | Construction | 2012 |
| Lyons 3 Limited | Financial services | 2010 |
| M & E Autos Limited | Wholesale & retail | 2011 |
| M C & Co Surveyors Limited | Real estate | 2020 |
| M G Financial Limited | Financial services | 2008 |
| M J Electrical Services EOT Limited | Administrative & support | 2020 |
| M J Electrical Services Limited | Construction | 2004 |
| M J Griffiths Transport Limited | Transport & logistics | 1997 |
| M Squared Brokers Ltd | Administrative & support | 2019 |
| M Wignall Plumbing & Heating Ltd | Construction | 2021 |
| M&D Moores Homes Limited | Real estate | 2023 |
| M. J. Griffiths (Properties) Limited | Transport & logistics | 2003 |
| M.A.B. Contractors Limited | Construction | 2007 |
| M.C.M. Rentals Limited | Hospitality | 2017 |
| MAB Builders Ltd | Construction | 2014 |
| Macreid Group Limited | Financial services | 2016 |
| Madcap Creative Services Limited | Information & communication | 2005 |
| MADNEO2 Ltd | Professional & scientific | 2018 |
| Maeves Hospitality Ltd | Hospitality | 2025 |
| Maex Developments Limited | Wholesale & retail | 2012 |
| Maex Holdings Limited | Real estate | 2020 |
| Maghull Coaches Limited | Transport & logistics | 2001 |
| Magic 13 Limited | Professional & scientific | 2023 |
| Magma Effect Limited | Professional & scientific | 2005 |
| Magnetic Measurements Ltd. | Manufacturing | 1994 |
| Maharishi School Trust Ltd | Education | 1985 |
| Majestic Beauty Warehouse Limited | Other services | 2019 |
| Majestic Lashes Limited | Other services | 2019 |
| Make Believe Boutique Ltd | Wholesale & retail | 2014 |
| Malthouse Property Holdings Ltd | Real estate | 2015 |
| Malwa Energy Ltd | Professional & scientific | 2025 |
| Manor Design Build Ltd | Construction | 2026 |
| Mara Publicity Ltd | Professional & scientific | 2016 |
| Marcus Bleasdale Limited | Extraterritorial | 2019 |
| Marjwin Enterprise Ltd | Hospitality | 2011 |
| Mark Birchall Chef Consulting Ltd | Hospitality | 2025 |
| Mark Challis Limited | Professional & scientific | 2017 |
| Mark Travis Audio Limited | Manufacturing | 2025 |
| Markhogan Limited | Transport & logistics | 2026 |
| Marshall-Abram Limited | Wholesale & retail | 1965 |
| Martin & Clavis Tiling Ltd | Construction | 2009 |
| Martin G Property Investments Ltd | Real estate | 2024 |
| Martin House Farms Limited | Agriculture & fishing | 2019 |
| Martyn Hicks Limited | Professional & scientific | 2014 |
| Mary's Place CIC | Education | 2023 |
| Matchday Tech Co. Ltd | Arts & recreation | 2024 |
| Matrix Services UK Limited | Professional & scientific | 1999 |
| Matt Hobson Surveys Ltd | Professional & scientific | 2025 |
| Matt Wood Architect Limited | Professional & scientific | 2018 |
| Mawdesley Engineering Contractors Limited | Professional & scientific | 2018 |
| Mawdesley Village Playing Field CIC | Arts & recreation | 2025 |
| Mawdsley Bros. Farms Limited | Agriculture & fishing | 1999 |
| Mawtec Systems Limited | Manufacturing | 2012 |
| MAX Torque Cans Ltd | Manufacturing | 2014 |
| Maximum Pads Limited | Real estate | 2024 |
| Maxwell Building Services Limited | Construction | 2016 |
| MAY Brothers (NW) Limited | Construction | 2013 |
| Mayfield Developments (NW) Limited | Construction | 2025 |
| Mayfield Heritage Limited | Construction | 2025 |
| MB Trading (NW) Limited | Wholesale & retail | 2024 |
| MC Lets NW Ltd | Households | 2023 |
| Mcalpine Facilities Services Limited | Households | 2026 |
| Mcbride Transport Ltd | Transport & logistics | 2025 |
| Mccabe Safety Solutions Ltd | Professional & scientific | 2024 |
| Mccomb Property Company Limited | Real estate | 1998 |
| Mccomb Property Holdings Limited | Financial services | 2023 |
| Mccomb Property Investments Limited | Real estate | 2018 |
| Mccomb Property Management Limited | Real estate | 2022 |
| Mcdougall Property Lettings Ltd | Real estate | 2026 |
| Mcelhinney Property Limited | Real estate | 2020 |
| Mckenna Communications Limited | Professional & scientific | 2009 |
| MCM Investments Limited | Other services | 1997 |
| Mcnamara's Sports Bar (Ormskirk) Limited | Hospitality | 2024 |
| Mcnamaras Sports Bar Limited | Hospitality | 2023 |
| MD Carpentry & Joinery NW Ltd | Construction | 2026 |
| MDE (Consultant Services) Limited | Administrative & support | 2016 |
| MDE Medico-Legal Limited | Administrative & support | 2014 |
| MDW Surveying and Engineering Services Limited | Professional & scientific | 2017 |
| ME Signalling Ltd | Manufacturing | 2023 |
| Mechra Limited | Professional & scientific | 2016 |
| Medi-File Limited | Professional & scientific | 2012 |