| Lovely Shop Birkenhead Ltd | Wholesale & retail | 2025 |
| Lovely Vape Shop Ltd | Wholesale & retail | 2025 |
| Lovette Software Ltd | Professional & scientific | 2024 |
| LOW Cost Drives and Patios Ltd | Construction | 2026 |
| Lrfc Services Limited | Construction | 2024 |
| LTA65 Ltd | Hospitality | 2024 |
| Ltfd MAN Ltd | Real estate | 2016 |
| Luap Services Limited | Professional & scientific | 2003 |
| Lucky Red Competitions Limited | Administrative & support | 2025 |
| Lucky Star Wirral Ltd | Hospitality | 2024 |
| Lucky’S Café Limited | Hospitality | 2026 |
| Luis 12 Consultancy Limited | Public administration | 2023 |
| Lukasz Skiba Transport Ltd. | Transport & logistics | 2014 |
| Lukerative Limited | Financial services | 2025 |
| Luma and Stone Ltd | Real estate | 2025 |
| Lundy Lettings Ltd | Real estate | 2026 |
| Luosto 2022 | Financial services | 2022 |
| Luxcom Europe Ltd | Wholesale & retail | 2015 |
| Luxe Management Ltd | Hospitality | 2025 |
| Lydiate Village Stores Limited | Wholesale & retail | 2015 |
| Lyndmark Ltd | Health & social care | 2019 |
| Lyndsay's Beauty Room Limited | Other services | 2017 |
| Lyon Engineering Systems Limited | Professional & scientific | 2006 |
| Lyte Digital Ltd | Information & communication | 2020 |
| M & Butler Property Ltd | Real estate | 2024 |
| M & J Creations Ltd | Manufacturing | 2024 |
| M & O (NW) Limited | Hospitality | 2018 |
| M LYE Autos Ltd | Wholesale & retail | 2018 |
| M Rylands Limited | Manufacturing | 2014 |
| M&B Ltd | Real estate | 2025 |
| M&J Food Brokers Ltd | Wholesale & retail | 2013 |
| M&M Cleaners (Wirral and Liverpool) Ltd | Administrative & support | 2025 |
| M&M Cleaners Holding Ltd | Financial services | 2025 |
| M&O Trends Ltd | Wholesale & retail | 2025 |
| M&R L Propertys Ltd | Households | 2024 |
| M. P. Edwards Limited | Construction | 2003 |
| M.P Services Ltd | Transport & logistics | 2025 |
| M.R Events Ltd | Hospitality | 2024 |
| M56 Pallets Limited | Other services | 2024 |
| MAC Installations Limited | Construction | 2015 |
| MAC Property Maintenance (NW) Limited | Real estate | 2017 |
| Mace Homes (NW) Limited | Construction | 2020 |
| Macs Place Ltd | Hospitality | 2024 |
| MAD Properties Inc. Ltd. | Real estate | 2025 |
| Magenta Living | Real estate | 2003 |
| Maguire Building & Construction Ltd | Construction | 2013 |
| Maguire Electrical Services Limited | Construction | 1994 |
| Mahaledsumy Convenience Ltd | Wholesale & retail | 2025 |
| Mailings Direct Ltd | Administrative & support | 2023 |
| Mainstay Care and Support Limited | Health & social care | 2022 |
| Maison Beauty Limited | Other services | 2025 |
| Makatswata Limited | Health & social care | 2014 |
| Make IT Happen Birkenhead C.I.C. | Wholesale & retail | 2019 |
| Make LCR CIC | Real estate | 2014 |
| Makespace Limited | Administrative & support | 2004 |
| Malacu Ltd | Transport & logistics | 2026 |
| Malone Developments Ltd | Hospitality | 2017 |
| Malu Hairdressing Ltd | Other services | 2017 |
| Malverns Investment Company Limited | Real estate | 2022 |
| Mamoo Ltd | Wholesale & retail | 2023 |
| MAN PV Ltd | Real estate | 2022 |
| Manage Your Home Ltd | Households | 2021 |
| Managed Mechanical Services Limited | Construction | 2017 |
| MANINE41 Ltd | Hospitality | 2025 |
| Manufacturing Support Services Ltd | Professional & scientific | 2003 |
| Maoin Group Limited | Real estate | 2023 |
| MAR Clients Ltd | Professional & scientific | 2025 |
| MAR PR Ltd | Professional & scientific | 2023 |
| Marine Consultants NW Ltd | Professional & scientific | 2026 |
| Marine Mammal Legal Research Limited | Professional & scientific | 2025 |
| Marine Point Restaurant Limited | Hospitality | 2019 |
| Marine Turbo Engineering Limited | Manufacturing | 1970 |
| Marios Pizza 46 Ltd | Hospitality | 2025 |
| Maristella Fashion House Ltd | Manufacturing | 2024 |
| Mark K Ward Limited | Construction | 2016 |
| Mark Watson Architects Limited | Professional & scientific | 2017 |
| Market Networks Limited | Information & communication | 2013 |
| Market Place Developments Limited | Real estate | 2018 |
| Market Street Lock & Key Ltd | Other services | 2026 |
| Marksign Ltd | Manufacturing | 2026 |
| Marley Property Ltd | Real estate | 2019 |
| Marnsurf Services Limited | Other services | 2020 |
| Marriage Tax Claims Limited | Wholesale & retail | 2017 |
| Marriott Motorcycles Limited | Wholesale & retail | 1999 |
| Marsh Cars Ltd | Transport & logistics | 2022 |
| Martin Kingdon Ltd | Construction | 2010 |
| Martin Wood Consulting Limited | Professional & scientific | 2007 |
| MAS Optimal Limited | Information & communication | 2012 |
| Masefield Holdings Limited | Real estate | 2023 |
| Mash Gym Products Ltd | Manufacturing | 2025 |
| Mason Locum Services Ltd | Health & social care | 2017 |
| Mason SJ Transport Ltd | Transport & logistics | 2015 |
| Masonic Temple Birkenhead Limited | Real estate | 1920 |
| Match Properties NW Ltd | Real estate | 2024 |
| Mathieson Developments Limited | Real estate | 1996 |
| Mattshepley.Com Ltd | Professional & scientific | 2024 |
| MAXIMB2B Ltd | Professional & scientific | 2009 |
| Maximum Roofing and Scaffolding Ltd | Construction | 2025 |
| Maximum Scaffolding Ltd | Construction | 2025 |
| Maxtier Ltd | Wholesale & retail | 2023 |