| Lwcn Properties Ltd | Real estate | 2026 |
| Lyon Incorporated Limited | Information & communication | 2024 |
| Lyons Estates Ltd | Real estate | 2013 |
| Lyster Holdings Ltd | Manufacturing | 2017 |
| M & J Arnold Property Ltd | Real estate | 2026 |
| M and E Fabrications Ltd | Manufacturing | 2018 |
| M J Hayden Consultancies Ltd | Manufacturing | 2025 |
| M K Developments Northwest Ltd | Real estate | 2011 |
| M Sweeney Properties Limited | Real estate | 2025 |
| M. Packenham Limited | Wholesale & retail | 1962 |
| M.G.M.Invest Ltd | Other services | 2022 |
| M.L. Development Ltd | Construction | 2019 |
| MA 1 Scaffolding Limited | Construction | 2022 |
| MA Trucking Limited | Transport & logistics | 2020 |
| MAC Cladding and Fire Protection Systems Limited | Construction | 2025 |
| MAC Electrical Contractors Limited | Construction | 2020 |
| MAD That Ltd | Information & communication | 2026 |
| Madam P African Shop 2 Ltd | Wholesale & retail | 2024 |
| Madam P African Shop Ltd | Wholesale & retail | 2023 |
| Maddocks Portfolio Limited | Real estate | 2025 |
| Maghull Double Glazing Group Limited | Manufacturing | 2024 |
| Maghull Double Glazing Ltd | Professional & scientific | 2006 |
| Magic Carwash Ltd | Administrative & support | 2026 |
| Magic Logistics Supply and Storage Services Limited | Transport & logistics | 2021 |
| Magic Touch Cleaning Services UK Ltd | Wholesale & retail | 2019 |
| Magnorium Ltd. | Information & communication | 2025 |
| Mainframe Computer Services Group Limited | Wholesale & retail | 1988 |
| Mainstreme Limited | Other services | 2012 |
| MAK Consult Ltd | Information & communication | 2015 |
| MAK Engineering Limited | Construction | 2019 |
| Makarios Enterprise Ltd | Transport & logistics | 2024 |
| Makela Cosmetics Ltd | Wholesale & retail | 2024 |
| Malexuk Ltd | Wholesale & retail | 2025 |
| Maltman Medical Imaging Ltd | Professional & scientific | 2020 |
| Manas Park Limited | Financial services | 2026 |
| Manna Care Ltd | Education | 2008 |
| Manna Day Centre Ltd | Health & social care | 2016 |
| Manor Building Solutions (UK) Ltd | Construction | 2012 |
| Many More Goods Limited | Wholesale & retail | 2023 |
| MAR CNC Limited | Manufacturing | 2017 |
| Marello Cosmetics and Fragrances Limited | Wholesale & retail | 2012 |
| Mariellem. Business Ltd | Health & social care | 2019 |
| Marina Carpets Centre Limited | Wholesale & retail | 2020 |
| Marina Technologies Ltd | Information & communication | 2019 |
| Marinastanciu Limited | Health & social care | 2019 |
| Mario Trans 80 Ltd | Transport & logistics | 2024 |
| Maris Arican Shop Ltd | Wholesale & retail | 2025 |
| Maritime Community Development Agency Limited | Education | 1997 |
| Mark IAN Kenny Ltd | Professional & scientific | 2024 |
| Marlborough Build Ltd | Construction | 2019 |
| Marshall Moore Recruitment Ltd | Administrative & support | 2025 |
| Mart Lines NW Ltd | Wholesale & retail | 2026 |
| Marx Capital Ltd | Construction | 2022 |
| Mary Davey Chemists Limited | Wholesale & retail | 2000 |
| Masefield Crescent 1955 Limited | Extraterritorial | 2014 |
| Mason & Jackson Ltd | Professional & scientific | 2023 |
| Mason's World CIC | Education | 2025 |
| Mast Diagnostics Limited | Health & social care | 1973 |
| Master Concrete (Liverpool) Limited | Construction | 2013 |
| Masters Walsh Holdings Ltd | Real estate | 2025 |
| Matelot Marine Limited | Professional & scientific | 2016 |
| Matisla Ltd | Information & communication | 2025 |
| Mattjon Financial Services Limited | Financial services | 2012 |
| Maxsn Ltd | Wholesale & retail | 2024 |
| Mayfair Care Solutions Limited | Health & social care | 2025 |
| Mayz Building Consultancy Limited | Professional & scientific | 2009 |
| MAZ Properties Limited | Real estate | 2004 |
| MB Power Projects Ltd | Construction | 2025 |
| Mb-Liverpool Ltd | Wholesale & retail | 2011 |
| MBB Method Coaching Ltd | Arts & recreation | 2025 |
| Mbek Group Limited | Wholesale & retail | 2025 |
| Mbek Properties Limited | Real estate | 2024 |
| MBN (Norwood) Limited | Construction | 2017 |
| Mbvoni Company Limited | Construction | 2011 |
| MC Architecture & Design Limited | Professional & scientific | 2015 |
| Mcallister Kerr Ltd | Other services | 2025 |
| Mcconville Enterprises Limited | Information & communication | 2014 |
| Mcdj Limited | Professional & scientific | 2012 |
| Mceveley Consulting Ltd | Administrative & support | 2025 |
| Mcilvenna Roofing and Cladding Ltd | Professional & scientific | 2020 |
| Mcloughlin's Property's Limited | Hospitality | 2025 |
| Mcnally Media Services Limited | Information & communication | 2009 |
| MCO Properties Limited | Real estate | 2025 |
| Mcphail Security Services Ltd | Construction | 2025 |
| MCS (Wirral) Limited | Information & communication | 2006 |
| MCS Technology Holdings Limited | Financial services | 2024 |
| Mcvitie Properties Ltd | Households | 2016 |
| MD Engineering & Fabrication Ltd | Manufacturing | 2020 |
| Mdvcs Limited | Administrative & support | 2017 |
| Medi Stick IT Ltd | Health & social care | 2018 |
| Mediterranean Tile Distributors Limited | Wholesale & retail | 2026 |
| Medley Pharma Limited | Manufacturing | 2014 |
| Medortho Ltd. | Health & social care | 2024 |
| Megabigprint.Com Limited | Manufacturing | 2008 |
| Mehari Convenience Store Ltd | Wholesale & retail | 2025 |
| Mekong Thai Ltd | Hospitality | 2021 |
| MEL Inn Ltd | Administrative & support | 2025 |
| MEL Inn PUB Ltd | Administrative & support | 2026 |
| MEL Properties Ltd | Real estate | 2018 |
| Melvin Mayard Limited | Professional & scientific | 2024 |