| Madina Shop Nelson Limited | Wholesale & retail | 2022 |
| Maius Ltd | Construction | 2024 |
| Majestic Housekeeping Ltd | Administrative & support | 2022 |
| MAL Professional Services Limited | Information & communication | 2013 |
| Manchester Triangle Ltd | Hospitality | 2022 |
| Manchini Pizzeria Ltd | Hospitality | 2024 |
| Mandore Limited | Professional & scientific | 2009 |
| Manor Abbott Properties Ltd | Construction | 2026 |
| Mark Deakin Limited | Construction | 2014 |
| Mark Tracey Consulting Limited | Information & communication | 2012 |
| Mark Whiteoak Driveway Specialist Ltd | Construction | 2021 |
| Mark Yates Projects Ltd | Construction | 2018 |
| Marley Composites Ltd | Manufacturing | 2016 |
| Marlynette Limited | Real estate | 2017 |
| Marsden Investments Limited | Real estate | 2021 |
| Marsdens Property Development Limited | Real estate | 2024 |
| Mathison Digital Limited | Professional & scientific | 2023 |
| Matthew PYE Stonemasonry Limited | Manufacturing | 2020 |
| Mayco Construction Ltd | Construction | 2024 |
| MC Roofing & Guttering Ltd | Construction | 2023 |
| Mcgowan Stone Ltd | Manufacturing | 2019 |
| MCL Stationery Ltd | Wholesale & retail | 2025 |
| MCR Services Ltd | Professional & scientific | 2020 |
| MD Laserworks Ltd | Extraterritorial | 2017 |
| MDJ Doncaster Ltd | Professional & scientific | 2006 |
| MEA Pharma Limited | Health & social care | 2024 |
| MEE Chok Thai Ltd | Hospitality | 2025 |
| Mendo Limited | Manufacturing | 1996 |
| Meranti Capital Ltd | Administrative & support | 2019 |
| Methys UK Limited | Information & communication | 2010 |
| MGB Consulting Limited | Professional & scientific | 2024 |
| MH Landscaping Ltd | Administrative & support | 2023 |
| Midas Supplements Ltd | Education | 2025 |
| Miller & Daughters Ltd | Real estate | 2018 |
| Mitchell Interflex Limited | Manufacturing | 1992 |
| MJM Driveways Ltd | Construction | 2018 |
| MJM Fire Consultants Limited | Professional & scientific | 2026 |
| MJS Creative Ltd | Manufacturing | 2023 |
| MKP Plumbing & Property Maintenance Ltd | Construction | 2026 |
| MKY Events Ltd | Administrative & support | 2018 |
| Modern Wills Ltd | Professional & scientific | 2021 |
| Monk of Colne Limited | Construction | 1971 |
| Moody Hair Ltd | Other services | 2015 |
| Moore Bars Limited | Hospitality | 2015 |
| Moorfield Property Services Ltd | Construction | 2025 |
| Moorvale Grange Limited | Administrative & support | 2014 |
| Morc Properties Limited | Real estate | 2021 |
| Mortimer Wood Ltd | Professional & scientific | 2020 |
| Motor Express Pendle Ltd | Wholesale & retail | 2023 |
| Mrms Solutions Ltd | Water & waste | 2019 |
| MSY Interiors Ltd | Other services | 2024 |
| MUJ. Ansar Properties Limited | Real estate | 2020 |
| Multi Supplies 4U Ltd | Wholesale & retail | 2015 |
| Multicare Mobility Products Ltd | Wholesale & retail | 2014 |
| Murray Mansion Ltd | Real estate | 2026 |
| N Lazenby Heating Ltd | Construction | 2023 |
| N T W Services Limited | Wholesale & retail | 2019 |
| N. R. Automatics (Engineering) Limited | Manufacturing | 1987 |
| N.G. Construction Consultancy Ltd | Construction | 2015 |
| N.P. Structures Limited | Manufacturing | 2001 |
| N.W.T.C Group Limited | Financial services | 2019 |
| N.W.T.C. Limited | Manufacturing | 2000 |
| Narwhal Communications Ltd | Professional & scientific | 2026 |
| Nastras Properties Ltd | Real estate | 2025 |
| National Polytunnels Ltd | Extraterritorial | 2022 |
| National Tunnels Ltd | Manufacturing | 2021 |
| Nationwide Special Projects Limited | Construction | 2000 |
| Nawazish Ltd | Wholesale & retail | 2022 |
| Nayoram Ltd | Transport & logistics | 2021 |
| NAZ Development Ltd | Hospitality | 2026 |
| NCA Accountancy Ltd | Professional & scientific | 2023 |
| Negotiis Consultancy Limited | Professional & scientific | 2016 |
| Nesco Trade LLP | | 2011 |
| Nestling Property Solutions Ltd. | Real estate | 2020 |
| Networking Catholic Education Trust Limited | Education | 2002 |
| Newgen NDT Ltd | Professional & scientific | 2016 |
| NGA Solicitors Limited | Professional & scientific | 2020 |
| Nicofuse Limited | Wholesale & retail | 2014 |
| Nihlobstat Limited | Real estate | 2003 |
| NINETEEN51 Estates Ltd | Real estate | 2026 |
| Niven Truck Bodies Limited | Professional & scientific | 2002 |
| NO More Human Limited | Wholesale & retail | 2024 |
| NO.15 Executive Travel Ltd | Transport & logistics | 2021 |
| Noonan & Co Ltd | Financial services | 2021 |
| Noor Capital Ventures Ltd | Financial services | 2024 |
| Norman Law Motors Ltd | Wholesale & retail | 1999 |
| North Valley Developments Limited | Real estate | 2000 |
| North Valley Retail Ltd | Wholesale & retail | 2016 |
| North Valley Ventures Ltd | Wholesale & retail | 2026 |
| Northern Comfort Furniture Ltd | Wholesale & retail | 2019 |
| Northern Investment Group Limited | Real estate | 2018 |
| Northern Life Media Ltd | Administrative & support | 2024 |
| Northfell Estates Ltd | Real estate | 2026 |
| Northserve Limited | Financial services | 2026 |
| Northstar Creative Design & Advertising LLP | | 2003 |
| Northwest Plumbing&Heating Limited | Construction | 2019 |
| Northwest Render Ltd | Construction | 2016 |
| Noticed. Resourcing Limited | Administrative & support | 2025 |
| Nova Digital Solutions Ltd | Professional & scientific | 2024 |
| Nova Smart Tech Ltd | Information & communication | 2024 |