| MA & a Medical Services Ltd | Health & social care | 2024 |
| MA Cars Rental Limited | Administrative & support | 2026 |
| MA Contracting Ltd | Construction | 2026 |
| MA Home Improvements Ltd | Construction | 2019 |
| MA Linens Limited | Manufacturing | 2019 |
| MA Medical Consultant Ltd | Health & social care | 2025 |
| MA Palace Ltd | Hospitality | 2025 |
| MA Pharma NW Limited | Health & social care | 2019 |
| MA Phoenix Holdings Ltd | Professional & scientific | 2026 |
| MA Rochdale Ltd | Real estate | 2025 |
| MA Spares Limited | Manufacturing | 2025 |
| MAA JEE Properties UK Ltd | Real estate | 2026 |
| MAA Property Lettings Ltd | Real estate | 2025 |
| Maazgo Logistics Limited | Transport & logistics | 2025 |
| MAB Contract Engineers Limited | Construction | 2005 |
| MAC Elevators Ltd | Professional & scientific | 2022 |
| MAC Engineering Installation Ltd | Professional & scientific | 2025 |
| Maccess Group Limited | Professional & scientific | 2006 |
| MAD Frog Media Ltd | Professional & scientific | 2025 |
| MAD50 210 Ltd | Real estate | 2024 |
| Made 2 Help Ltd | Administrative & support | 2022 |
| Made UP Hair Extensions Limited | Other services | 2025 |
| Madeley Heath Developmental Limited | Other services | 2015 |
| Madina & Co UK Ltd | Hospitality | 2024 |
| Madina Catering Limited | Hospitality | 2015 |
| Madina Food Store Rochdale Limited | Wholesale & retail | 2023 |
| Madina Super Store Rochdale Ltd | Wholesale & retail | 2017 |
| Madjack Health Limited | Other services | 2011 |
| Madz Ltd | Information & communication | 2019 |
| MAGENIX817GROUP Ltd | Manufacturing | 2025 |
| Magic Group Ltd | Administrative & support | 2017 |
| Magic Mobile Limited | Wholesale & retail | 2014 |
| Magill Electrical Ltd | Construction | 2020 |
| Magnum Car Panels Limited | Manufacturing | 1973 |
| Maguire and Hurst Painting Contractors Limited | Construction | 2012 |
| MAH Global Traders Ltd | Wholesale & retail | 2026 |
| MAH Housing Limited | Households | 2023 |
| MAH Sellers Ltd | Wholesale & retail | 2026 |
| Mahadev Developments Ltd | Real estate | 2022 |
| Mahapooja Ltd | Wholesale & retail | 2019 |
| Mahar Traders PVT Ltd | Hospitality | 2025 |
| Mahertar&Sons Ltd | Construction | 2024 |
| Mahizh Limited | Wholesale & retail | 2026 |
| Mahoney Catering Management Ltd | Hospitality | 2022 |
| MAI Group Properties Limited | Real estate | 2017 |
| Maine Consultants Ltd | Professional & scientific | 2020 |
| Mains Building Contractors Ltd | Construction | 2020 |
| Mains Restoration Services Ltd | Transport & logistics | 2023 |
| Maison Aurele Ltd | Wholesale & retail | 2025 |
| MAJ Optical Limited | Health & social care | 2026 |
| Majeed Properties Limited | Arts & recreation | 2023 |
| Majestic Imports UK Ltd | Wholesale & retail | 2023 |
| Majestic Medical Limited | Extraterritorial | 2023 |
| Majestic Patrol-Safe Security Ltd | Administrative & support | 2025 |
| Major DEE Investments Ltd | Real estate | 2024 |
| MAK Solutions Ltd | Professional & scientific | 2022 |
| Makaan+ Limited | Real estate | 2021 |
| Makin Associates Limited | Professional & scientific | 2025 |
| Makin Metal Powders (UK) Limited | Manufacturing | 2009 |
| Making Tax DIGITAL-4-U Ltd | Professional & scientific | 2026 |
| Makk Cars Ltd | Wholesale & retail | 2024 |
| Maktrans Logistics Ltd | Transport & logistics | 2018 |
| Malaikah PVT Limited | Health & social care | 2024 |
| Malik Bros Properties Ltd | Real estate | 2025 |
| Malik Consulting Group Ltd | Professional & scientific | 2025 |
| Malik Food Plus Ltd | Hospitality | 2023 |
| Maliks Mini Mart Ltd | Wholesale & retail | 2023 |
| Malsi Group Ltd | Health & social care | 2023 |
| Malthouse Inns PLC | Wholesale & retail | 1998 |
| MAM Investments Limited | Real estate | 2020 |
| Mama Buka Ltd | Manufacturing | 2023 |
| Managed Payroll Services Ltd | Professional & scientific | 2018 |
| Manchester Blooms Ltd | Wholesale & retail | 2025 |
| Manchester Building and Testing Laboratories Limited | Professional & scientific | 1969 |
| Manchester Commercial Parts Ltd | Wholesale & retail | 2023 |
| Manchester Commercial Vehicle Cleaning Limited | Administrative & support | 2010 |
| Manchester One Driving School Ltd | Education | 2025 |
| Manchester Outdoor Fitness Graham Ltd | Other services | 2025 |
| Manchester School of Driving Ltd | Education | 2026 |
| Manchester Shutter Specialist Ltd | Manufacturing | 2023 |
| Manchester Solid Construction and Design Company Ltd | Construction | 2018 |
| Manchester Traders Limited | Wholesale & retail | 2017 |
| MANCHESTER2MAKKAH Ltd | Administrative & support | 2024 |
| Mania Events Limited | Arts & recreation | 2022 |
| Maniora Enterprises PVT Ltd | Other services | 2026 |
| Mansfield Soft Furnishings Ltd | Construction | 2000 |
| Manthravadis LLP | | 2025 |
| Mantis Systems Ltd | Construction | 2016 |
| Maqbool & Jones Gardening Services Ltd | Administrative & support | 2025 |
| Maqio Group Limited | Financial services | 2021 |
| Maqio Limited | Wholesale & retail | 2010 |
| Marathon Trading Ltd | Wholesale & retail | 2026 |
| Marcus J Limited | Administrative & support | 2019 |
| Marhab Services Ltd | Professional & scientific | 2024 |
| Marhome Property Services Limited | Real estate | 2017 |
| Mariana Cares Limited | Health & social care | 2015 |
| Marisona Ltd | Manufacturing | 2025 |
| Marizzz Limited | Wholesale & retail | 2023 |
| Marjaan Investment Limited | Real estate | 2026 |
| Mark Ashworth Transport Ltd | Transport & logistics | 2013 |