| Mishtech Solutions Ltd | Wholesale & retail | 2024 |
| Missymac Limited | Information & communication | 2005 |
| Mitchell Contracting (North West) Limited | Administrative & support | 2005 |
| Mitchell Financial Holdings Limited | Financial services | 2021 |
| MIX Grill Limited | Hospitality | 2026 |
| Mixalmond Ltd | Wholesale & retail | 2018 |
| Miza Medical Ltd | Health & social care | 2026 |
| MJ Dental Ltd | Health & social care | 2021 |
| MJ Dental Property Ltd | Real estate | 2021 |
| MJ FBA Ltd | Wholesale & retail | 2023 |
| MJ Scaffolding & Rigging Limited | Construction | 2023 |
| Mj's Bar Ltd | Hospitality | 2023 |
| Mjbf Holdings Limited | Construction | 2025 |
| Mjkm Financial Services Limited | Professional & scientific | 2021 |
| MJS Echocardiography Limited | Health & social care | 2022 |
| MK & a Properties Limited | Real estate | 2025 |
| MK by MK Ltd | Wholesale & retail | 2026 |
| MK Joiners Ltd | Manufacturing | 2023 |
| MK Recovery Limited | Transport & logistics | 2020 |
| MK Superstores Ltd | Wholesale & retail | 2014 |
| MKA Plumbing & Heating Limited | Construction | 2012 |
| Mkhb Investments Ltd | Real estate | 2018 |
| Mkhb Ltd | Wholesale & retail | 2016 |
| Mkks Properties Ltd | Construction | 2025 |
| MKO Performance & Support Ltd | Professional & scientific | 2024 |
| MKS Facility Group Limited | Professional & scientific | 2025 |
| MKT Styles Limited | Wholesale & retail | 2020 |
| MKY Roofing Ltd | Construction | 2025 |
| ML Events Limited | Arts & recreation | 2022 |
| MLC Properties (N.W.) Ltd | Real estate | 2022 |
| MLG Governance Services Ltd | Professional & scientific | 2014 |
| MLP Management Ltd | Real estate | 2012 |
| MLW Electrical NW Ltd | Construction | 2023 |
| MLY CAD Services Limited | Professional & scientific | 2022 |
| Mmctsafetynow Ltd | Professional & scientific | 2025 |
| MMK Builders Ltd | Construction | 2022 |
| MMT Furniture Designs Limited | Wholesale & retail | 2013 |
| Mmuiz Limited | Other services | 2021 |
| MN Training and Compliance Ltd | Professional & scientific | 2026 |
| Mnajaffery Ltd | Wholesale & retail | 2023 |
| MNS Locum Limited | Professional & scientific | 2008 |
| Mobi Motors Ltd | Wholesale & retail | 2026 |
| Mobile Panda Ltd | Wholesale & retail | 2024 |
| Mobile Smart Repair Tech Ltd | Wholesale & retail | 2024 |
| Mobile ZIP Wire Hire Limited | Other services | 2012 |
| Mobiles &Tablets Bolton Limited | Wholesale & retail | 2015 |
| MOD Partners Limited | Professional & scientific | 2013 |
| Modbury Court Management Company Limited | Households | 1995 |
| Model ME Aesthetics Limited | Wholesale & retail | 2019 |
| Modern Painting Solutions Ltd | Wholesale & retail | 2016 |
| Modev Group Limited | Administrative & support | 2024 |
| Modtex Limited | Extraterritorial | 2026 |
| Modulift Limited | Real estate | 1999 |
| Modwen Quays Ltd | Real estate | 2015 |
| Molen Technic Ltd | Construction | 2017 |
| Molivian Limited | Real estate | 2014 |
| Mollow Capital Limited | Real estate | 2025 |
| Momentumfx Limited | Financial services | 2020 |
| Monarch Aesthetics and Beauty Ltd | Other services | 2025 |
| Money Reclaim Expert Ltd. | Information & communication | 2011 |
| Money Saving Group Limited | Financial services | 2004 |
| Monopoly Properties Business Ltd | Real estate | 2019 |
| Montec Estates Limited | Real estate | 2006 |
| Monthlee Ltd | Wholesale & retail | 2024 |
| Montreal Group Ltd | Wholesale & retail | 2021 |
| Monvex Ltd | Wholesale & retail | 2025 |
| MOO Fashion Ltd | Wholesale & retail | 2025 |
| Moon Juice Creative Limited | Arts & recreation | 2004 |
| Moonhead Ventures Ltd | Information & communication | 2023 |
| Moonlit Media Limited | Professional & scientific | 2024 |
| Moontec Limited | Professional & scientific | 2018 |
| Moorcroft Real Estate Limited | Real estate | 2020 |
| Moore & Moore Windows Ltd | Information & communication | 2016 |
| Moore Strategic Consulting Limited | Professional & scientific | 2013 |
| Moorgate Grill Ltd | Hospitality | 2020 |
| Moorland Heights Ltd | Real estate | 2013 |
| Morganpowell Ltd | Real estate | 2018 |
| Moris Car BOD Accident Repair Ltd | Wholesale & retail | 2025 |
| Morrell Group Investments Limited | Administrative & support | 2019 |
| Mortgage Changes Ltd | Financial services | 2012 |
| Moscrops Financial Planning (Bury) LLP | | 2010 |
| Moscrops Financial Planning Limited | Professional & scientific | 2008 |
| Moss Bank Flooring Ltd | Other services | 2019 |
| Mosses Community PRE School C.I.C. | Education | 2019 |
| Mossglade Fabrics Limited | Wholesale & retail | 2008 |
| Motherzen CIC | Education | 2024 |
| Motion Contractors Ltd | Administrative & support | 2025 |
| Motion Industries (U.K.) Limited | Wholesale & retail | 1999 |
| Motion Industries Holdings Limited | Financial services | 2025 |
| Motley Bar Services Ltd | Professional & scientific | 2025 |
| Motor 365 Ltd | Wholesale & retail | 2020 |
| Motor Car Parts Ltd | Wholesale & retail | 2025 |
| Motor Claim Guru Ltd. | Financial services | 2014 |
| Motor Pals Ltd | Wholesale & retail | 2025 |
| Motor Restore Ltd | Manufacturing | 2015 |
| Motor Switch Ltd | Wholesale & retail | 2017 |
| Motorpool Services Ltd | Wholesale & retail | 2021 |
| Motorshift Limited | Wholesale & retail | 2023 |
| Mottram ST Developments Limited | Real estate | 2022 |
| Mounfield Industries Limited | Professional & scientific | 2014 |