| Manchester Radar Calibration Limited | Wholesale & retail | 2023 |
| Marcus YS Limited | Real estate | 2022 |
| Mardesafe Care Ltd | Other services | 2023 |
| Marjwood Ltd | Agriculture & fishing | 2009 |
| Mark Bates and Sons (Holdings) Limited | Financial services | 2023 |
| Marlies Trading Ltd. | Hospitality | 2018 |
| MAS Performance Limited | Other services | 2017 |
| Maslo Group Ltd | Real estate | 2025 |
| Masterplan London Limited | Administrative & support | 2024 |
| Mcmh Investments Ltd | Real estate | 2023 |
| MDS Residential Ltd | Real estate | 2024 |
| Meeks Market Place Ltd | Wholesale & retail | 2024 |
| Merlin YS Ltd | Real estate | 2024 |
| Mexstar Solutions Limited | Wholesale & retail | 2016 |
| Meyertech Limited | Manufacturing | 2000 |
| Micronix Limited | Construction | 2018 |
| Middleton Hand Car Wash Ltd | Administrative & support | 2025 |
| Middleton Masonic Club Limited(The) | Hospitality | 1936 |
| Middleton Top Barbers Limited | Other services | 2022 |
| Middletons (Milton Keynes) Limited | Hospitality | 2025 |
| Millennial Vintage Ltd | Wholesale & retail | 2020 |
| Mindfull Journey Limited | Health & social care | 2025 |
| Mirabow Limited | Real estate | 1989 |
| Mishra Properties Ltd | Real estate | 2024 |
| Mister Investor Ltd | Real estate | 2025 |
| Mjjw Ltd | Wholesale & retail | 2024 |
| MLH Plumbing & GAS Limited | Construction | 2024 |
| MNM Property Investments Ltd | Real estate | 2019 |
| Mnnle Ltd | Real estate | 2025 |
| MNY Norfeld Ltd | Real estate | 2025 |
| MOB Agencies Limited | Extraterritorial | 2019 |
| Momo Management Ltd | Administrative & support | 2025 |
| Monsey Ltd | Other services | 2016 |
| Morcal Limited | Construction | 2023 |
| Morgan Advisory Services Limited | Financial services | 2018 |
| Mosedale Care Ltd | Health & social care | 2019 |
| Mount Engraving Tools Limited | Professional & scientific | 1979 |
| MTT Combat Ltd | Arts & recreation | 2019 |
| MV Firm Ltd | Real estate | 2023 |
| My Workspace Ltd | Financial services | 2025 |
| National Protective Properties Ltd | Real estate | 2025 |
| Network House NW Ltd | Real estate | 2022 |
| New Key Properties Limited | Real estate | 2020 |
| Newcombe Ventures Limited | Administrative & support | 2017 |
| Newsbale Newsagents Ltd | Wholesale & retail | 2000 |
| Next Generation Analysts Ltd | Education | 2024 |
| NGS Tech Props Ltd | Arts & recreation | 2021 |
| NMH Developments Ltd | Real estate | 2016 |
| Nodlesh Limited | Other services | 2025 |
| Noraa Collectables Ltd | Construction | 2025 |
| Norris Scaffolding Services Limited | Construction | 2023 |
| Norris Solutions Group Ltd | Construction | 2023 |
| North MCR Waste Services Ltd | Water & waste | 2025 |
| Northwest Car Cosmetics Limited | Wholesale & retail | 2008 |
| Noshers Express Limited | Hospitality | 2018 |
| Nova Construction NW Ltd | Construction | 2024 |
| Nova Painting and Decorating Ltd | Construction | 2024 |
| NU Uniforms Limited | Wholesale & retail | 2011 |
| Numan Holdings Ltd | Real estate | 2025 |
| Nutmeg House Limited | Health & social care | 2017 |
| NW Travel Limited | Real estate | 2022 |
| NW Vending Limited | Wholesale & retail | 2025 |
| Nyra Investments Ltd | Wholesale & retail | 2022 |
| O a Bamgbose Ltd | Health & social care | 2016 |
| O.T.M Restaurant Limited | Hospitality | 2019 |
| Oak FM Limited | Other services | 2020 |
| Oakdale Road London Limited | Administrative & support | 2024 |
| Oakmont Enterprises Limited | Other services | 2014 |
| Oaks Goods Limited | Wholesale & retail | 2010 |
| Oben Construction Ltd | Construction | 2025 |
| Oben Investments Ltd | Administrative & support | 2025 |
| OBP Hairs Ltd | Other services | 2025 |
| Okeover (Hood) Ltd | Real estate | 2021 |
| Oldbay Limited | Hospitality | 2024 |
| Omelet Letting & Management Limited | Real estate | 2018 |
| Omelet Maintenance & Construction Limited | Construction | 2018 |
| Openhall Limited | Real estate | 2025 |
| Orchard House 1020 Right to Manage Company Limited | Households | 2021 |
| Orelis Global Events Ltd | Other services | 2026 |
| Orenda World Ltd | Wholesale & retail | 2025 |
| OS Properties Ltd | Real estate | 2026 |
| Osher Holidays Limited | Hospitality | 2019 |
| P N D Property Maintenance Ltd | Construction | 2024 |
| P R Panels Limited | Manufacturing | 2005 |
| P.T.Zone Ltd | Other services | 2021 |
| Pace Development Ltd | Administrative & support | 2018 |
| Paint ME Red CIC | Administrative & support | 2018 |
| Parkhouse Assist Ltd | Administrative & support | 2026 |
| Paws & Purpose Limited | Wholesale & retail | 2025 |
| Peaktarn | Construction | 1992 |
| Penrose Corp Ltd | Real estate | 2024 |
| Performance Unit Gym Ltd | Arts & recreation | 2024 |
| Peter MAC Properties Ltd | Real estate | 2022 |
| Peter Weir & Co Limited | Administrative & support | 2025 |
| Pimlot Limited | Real estate | 2019 |
| Pinders School Wear Limited | Wholesale & retail | 2016 |
| Plastering Craft Limited | Construction | 2010 |
| Plott Creative Ltd | Arts & recreation | 2007 |
| Ploutus Capital Ltd | Construction | 2023 |
| Precision Plastering NW Limited | Construction | 2024 |