| Maple Syrup Marketing Ltd | Professional & scientific | 2026 |
| Maple Tyres Ltd | Wholesale & retail | 2024 |
| Mara Marketing Limited | Professional & scientific | 2025 |
| Marah Super Stores Limited | Wholesale & retail | 2025 |
| Marajjas Ltd | Wholesale & retail | 2020 |
| Marantomark Limited | Health & social care | 2000 |
| Marcelus Ltd | Information & communication | 2022 |
| Marceo Limited | Health & social care | 2019 |
| March 247 Limited | Health & social care | 2014 |
| Mardec & Co Accountants Ltd | Administrative & support | 2022 |
| Marhan Ltd | Transport & logistics | 2024 |
| Maria Toma Ltd | Administrative & support | 2026 |
| Mariam Collection Ltd | Wholesale & retail | 2025 |
| Mariedo's Bar & Kitchen Ltd | Hospitality | 2024 |
| Marikosun Limited | Professional & scientific | 2025 |
| Marilyn Hopkins Estate Agents Ltd | Real estate | 2014 |
| Marina House RTM Company Limited | Households | 2026 |
| Mario Ir-Trans Ltd | Transport & logistics | 2022 |
| Mario's (Oldham) Limited | Real estate | 1982 |
| Marius SRL Ltd | Wholesale & retail | 2022 |
| Mark a Reynolds Ltd | Administrative & support | 2018 |
| Mark Demsteader Limited | Arts & recreation | 2011 |
| Mark Goodwin Pianos Limited | Wholesale & retail | 2003 |
| Mark Higgins Limited | Administrative & support | 2008 |
| Mark Leeming T/A the Pull Limited | Professional & scientific | 2023 |
| Mark Neary Physiotherapy Limited | Health & social care | 2009 |
| Mark Plumbing Ltd | Construction | 2026 |
| Mark Robert Limited | Real estate | 2016 |
| Mark Sweeney Properties Ltd | Real estate | 2023 |
| Mark Twain (Rochdale) Ltd | Hospitality | 2024 |
| Mark Wilson Furniture Limited | Manufacturing | 2008 |
| MARK8 Management Limited | Health & social care | 2011 |
| Markdan Designs Ltd | Professional & scientific | 1996 |
| Market Effects Limited | Administrative & support | 2011 |
| Market Lane Ltd | Wholesale & retail | 2025 |
| Market Place (Europe) Limited | Wholesale & retail | 2004 |
| Market Place (Property) Limited | Real estate | 2013 |
| Market Place Events Limited | Wholesale & retail | 2005 |
| Market Place Management Limited | Administrative & support | 2007 |
| Market Place NW Ltd | Professional & scientific | 2025 |
| Market Place Tavern Ltd | Hospitality | 2017 |
| Market Street Enterprises Limited | Real estate | 2023 |
| Market Street Law Limited | Professional & scientific | 2014 |
| MARKET2AT Ltd | Professional & scientific | 2025 |
| Marketmaverick Ltd | Wholesale & retail | 2025 |
| Marketplaces Invest AZ Ltd. | Professional & scientific | 2024 |
| Marks Jewellers and Pawnbrokers Limited | Wholesale & retail | 2010 |
| Marlowe Geophysical Limited | Mining & quarrying | 2006 |
| Marlows Home Improvements Ltd | Construction | 2022 |
| Maroushka N Holdings Ltd | Wholesale & retail | 2025 |
| Marple Convenience Limited | Wholesale & retail | 2024 |
| Marpol Tech Ltd | Wholesale & retail | 2024 |
| Marqueesbybnb Ltd | Administrative & support | 2025 |
| Marrigold Ltd | Other services | 2020 |
| Marsanz UK Limited | Wholesale & retail | 2008 |
| Marsch & Co. Ltd. | Administrative & support | 2008 |
| Marsden Metal Products Ltd | Manufacturing | 2019 |
| Marsh Farm Ltd | Agriculture & fishing | 2024 |
| Marshall & Sons Renovations & Property Management Ltd | Real estate | 2023 |
| Mart on Store Ltd | Wholesale & retail | 2021 |
| MART786 Ltd | Manufacturing | 2025 |
| Martin Halkyard Limited | Professional & scientific | 2016 |
| Martin LEE Homes Ltd | Construction | 2020 |
| MARTRUS15 Ltd | Real estate | 2017 |
| Marwoods Private Limited | Wholesale & retail | 2020 |
| Marxten Consulting Limited | Wholesale & retail | 2025 |
| Mary Ventures Ltd | Wholesale & retail | 2025 |
| Mary's Kitchen Oldham Ltd | Hospitality | 2025 |
| Marzees Enterprises Ltd | Other services | 2026 |
| MAS and Sons Auto UK Limited | Wholesale & retail | 2020 |
| MAS Electrics Limited | Construction | 2026 |
| MAS NW Consultants Ltd | Other services | 2024 |
| MAS of Shaw Limited | Wholesale & retail | 2006 |
| MAS Painting & Decorating Ltd | Construction | 2010 |
| MAS Private Travels Limited | Transport & logistics | 2026 |
| MAS Safety (NW) Ltd | Administrative & support | 2025 |
| MAS Service Centre Limited | Wholesale & retail | 2023 |
| Masalamaza Ltd | Hospitality | 2018 |
| Masart Joinery Ltd | Construction | 2022 |
| Mashreqi Limited | Wholesale & retail | 2024 |
| Masmf Limited | Real estate | 2024 |
| Masoo Ltd | Construction | 2024 |
| Masoom Ltd | Real estate | 2020 |
| Mass Energy Solutions Ltd | Construction | 2024 |
| Massive Technical Solutions Limited | Administrative & support | 2006 |
| Master Blinds Ltd | Manufacturing | 2023 |
| Master Build NW Ltd | Construction | 2026 |
| Master Contact Centre Ltd | Professional & scientific | 2025 |
| Master Mobile Tyre and Auto Care Ltd | Wholesale & retail | 2025 |
| Master Moves Ltd | Transport & logistics | 2007 |
| Master Rides Ltd | Transport & logistics | 2025 |
| Master UK Seller Ltd | Wholesale & retail | 2021 |
| Masuma Express Limited | Hospitality | 2024 |
| Mathz Ltd | Transport & logistics | 2022 |
| Matila Services Limited | Water & waste | 2025 |
| Matley Services Limited | Construction | 2017 |
| Matos Events & Caters Ltd | Construction | 2024 |
| Matreex Ltd | Information & communication | 2025 |
| Matrix Building Services Ltd | Construction | 2023 |
| Matt Hoyle Personal Training Ltd | Arts & recreation | 2016 |