| Luxury Travel NW Ltd | Transport & logistics | 2022 |
| Luxx International Cosmetic Academy Ltd | Other services | 2022 |
| LWC Trading Subsidiary Limited | Other services | 2017 |
| LYC Consul Ltd | Information & communication | 2024 |
| Lyfe Style Leasing Limited | Administrative & support | 2017 |
| Lyfe Style Nutrition Limited | Wholesale & retail | 2021 |
| Lynn Scholes Consultancy Ltd | Administrative & support | 2021 |
| M & S Enterprises (NW) Ltd | Wholesale & retail | 2023 |
| M & S Mini Market Ltd | Wholesale & retail | 2021 |
| M & S Restaurants and Bars Ltd | Hospitality | 2015 |
| M and GT Housing Limited | Real estate | 2020 |
| M H Properties NW Ltd | Real estate | 2016 |
| M J Ballard Consultants Limited | Professional & scientific | 2014 |
| M Pollard Joinery and Construction Ltd | Construction | 2022 |
| M&M Cabz Ltd | Transport & logistics | 2025 |
| M-Tex Europe Limited | Wholesale & retail | 2005 |
| M. Hunka Ltd | Construction | 2020 |
| M. Mandziak Limited | Manufacturing | 2008 |
| M.A Motors Northwest Ltd | Wholesale & retail | 2026 |
| M.I Real Estate Group Ltd | Real estate | 2023 |
| M.M.Ross the Design House Ltd | Wholesale & retail | 2019 |
| M.P.V. Packaging (Holdings) Limited | Financial services | 2004 |
| M.P.V. Packaging Limited | Manufacturing | 2001 |
| M.S Building & Maintenance Ltd | Construction | 2025 |
| M.T.P Engineering Services Padiham Ltd | Professional & scientific | 2017 |
| M2 Construction (North West) Limited | Construction | 2015 |
| M2D Property Maintenance Ltd | Construction | 2025 |
| M65 Vehicle Repair Centre Ltd | Manufacturing | 2017 |
| MA Builders MCR Ltd | Construction | 2022 |
| MA Medical Ltd | Health & social care | 2024 |
| MA NW Ltd | Wholesale & retail | 2024 |
| MACH1 Joinery Ltd | Construction | 2021 |
| Machine Operators (Northwest) Limited | Construction | 2015 |
| Machine Tools FW Limited | Wholesale & retail | 2025 |
| Macreadys Transport Ltd | Transport & logistics | 2026 |
| MAD Jack's Custom's Ltd | Manufacturing | 2019 |
| Maden Medical Services Ltd | Health & social care | 2016 |
| Madmixer Ltd | Hospitality | 2025 |
| Madni Travels Ltd | Real estate | 2014 |
| Maerdy Mawr Farm Limited | Professional & scientific | 2005 |
| Magdi Fernandes Limited | Administrative & support | 2013 |
| MAGN8 Ltd | Information & communication | 2023 |
| Major Scale Music Education Limited | Education | 2025 |
| MAK A&A Limited | Transport & logistics | 2024 |
| MAK Operations Ltd | Transport & logistics | 2022 |
| Manchester Blinds 123 Limited | Manufacturing | 2023 |
| Manchester Hiab Hire Limited | Professional & scientific | 1998 |
| Manchester Road Convenience Store Ltd | Wholesale & retail | 2026 |
| Manchester Stove Installers Limited | Construction | 2022 |
| Manor House Child Care Ltd | Health & social care | 2018 |
| Mapleford Limited | Professional & scientific | 1988 |
| Marbar Transport Ltd | Transport & logistics | 2016 |
| Marchbridge Builders Limited | Construction | 1981 |
| Marco BB Limited | Wholesale & retail | 2025 |
| Mark Holmes Building Ltd | Construction | 2020 |
| Mark Holmes Properties Ltd | Real estate | 2026 |
| Markalytic Ltd | Information & communication | 2019 |
| Marlie (Civils) Limited | Construction | 2012 |
| Marnia Estate Limited | Real estate | 2026 |
| Marriet Construction Limited | Construction | 2024 |
| Marshmallows (Accrington) Ltd | Education | 2004 |
| Maryam & Faiza Ltd | Hospitality | 2025 |
| MAS 300 Ltd | Households | 2018 |
| Masoom Investments Ltd | Real estate | 2026 |
| Master Foam Products Import & Export Ltd | Manufacturing | 2025 |
| Master Foam-Products Ltd | Manufacturing | 2020 |
| Master FU Ltd | Hospitality | 2021 |
| Master Ground Services Limited | Construction | 2010 |
| Master of Martial Arts HQ CIC | Education | 2021 |
| Masterbutlercollection Limited | Professional & scientific | 2024 |
| Masters of Martial Arts LLP | | 2015 |
| Masters Personal Training Limited | Health & social care | 2007 |
| Masuta Ltd | Wholesale & retail | 2014 |
| Material Girl Accrington Ltd | Wholesale & retail | 2025 |
| Matrix Roofing Ltd | Construction | 2025 |
| Matrix Soccer Academy Ltd | Education | 2018 |
| Matt Culpin Design Limited | Professional & scientific | 2015 |
| Matthew Baldwin Consultants Limited | Construction | 2019 |
| Mattrest Limited | Manufacturing | 2024 |
| Maude and Franks Company Limited | Wholesale & retail | 2020 |
| Maverick Fabrication Ltd | Construction | 2017 |
| MAX & MAX Enterprises Ltd | Wholesale & retail | 2017 |
| MAX Cars Accrington Limited | Transport & logistics | 2018 |
| MAX MOT (Accrington) Ltd | Wholesale & retail | 2019 |
| Maximise Group Ltd | Professional & scientific | 2024 |
| Maxwell Rose Investments Ltd | Administrative & support | 2019 |
| Mayfair Estates NW Limited | Real estate | 2025 |
| MBE Facades Ltd | Construction | 2022 |
| Mcdaid Investments Ltd | Real estate | 2023 |
| Mcgauley Plumbing & Heating Services Ltd | Construction | 2023 |
| Mcgrath Wealth Management Ltd | Financial services | 2015 |
| Mcgreen Developments Limited | Real estate | 2025 |
| Mckenna Motors Limited | Wholesale & retail | 2019 |
| MCL (NW) Holdings Limited | Financial services | 2025 |
| MCL (NW) Limited | Financial services | 2020 |
| Mcmurray's Haulage Limited | Transport & logistics | 2003 |
| Mcmurrays Haulage Holdings Limited | Administrative & support | 1982 |
| MCR Fire Protection Limited | Construction | 2021 |
| MCR Investment Properties Ltd | Real estate | 2023 |
| Mcsorley Properties (NW) Ltd | Real estate | 2023 |