| Moorhayes Estates Limited | Real estate | 1999 |
| Moorhouse Care Services Limited | Health & social care | 2019 |
| Moorhouse Communications Ltd | Administrative & support | 2008 |
| Moos Enterprises Ltd | Professional & scientific | 2014 |
| Mooso Consulting Limited | Professional & scientific | 2007 |
| Moppet Ltd | Wholesale & retail | 2018 |
| MOR1X Limited | Professional & scientific | 2023 |
| Morgan Moore Limited | Professional & scientific | 2017 |
| Morko Capital Ltd. | Financial services | 2018 |
| MOS Eisley Ltd | Professional & scientific | 2005 |
| Moses Dawn Ltd | Health & social care | 2012 |
| Moss Technologies Limited | Administrative & support | 2015 |
| Motopro Limited | Administrative & support | 2012 |
| Mouiex Ltd | Professional & scientific | 2019 |
| Mouiez Limited | Professional & scientific | 2019 |
| Mountain Padel Limited | Arts & recreation | 2025 |
| Movimo Ltd. | Information & communication | 2022 |
| Moving on Care Management Limited | Hospitality | 1999 |
| Mowatt Properties Ltd | Real estate | 2002 |
| Moxie PR Limited | Professional & scientific | 2016 |
| MPH Services Ltd | Transport & logistics | 2023 |
| MPS Romford Ltd | Hospitality | 2019 |
| MQ Projects Ltd | Construction | 2016 |
| MR Automotive Services Limited | Wholesale & retail | 2024 |
| MR Facility Management Ltd | Administrative & support | 2025 |
| MR Transfers Limited | Transport & logistics | 2024 |
| MRC Catering Limited | Hospitality | 2020 |
| MSI Kingswood Limited | Construction | 2015 |
| MTQ Limited | Professional & scientific | 2020 |
| Mudfords Bar & Grill Ltd | Hospitality | 2021 |
| Mujimuse Limited | Wholesale & retail | 2021 |
| Mulas Construction Ltd | Construction | 2020 |
| Mulgravia (Maintenance) Limited | Households | 1960 |
| Mutare Essential Limited | Health & social care | 2016 |
| Mvtherapy Ltd | Other services | 2025 |
| MWF Holdings Ltd | Real estate | 2018 |
| My Body Rocks Events Limited | Arts & recreation | 2024 |
| My Colour IS Gold Ltd | Administrative & support | 2021 |
| My Favorite Productions Limited | Arts & recreation | 1998 |
| My Second Home in Bulgaria Ltd | Real estate | 2006 |
| Myclubhaus Limited | Construction | 2021 |
| Myths & Legends Ltd | Professional & scientific | 2024 |
| N J RAY Accountants Ltd | Professional & scientific | 2026 |
| N J RAY Accounting Services Limited | Administrative & support | 2011 |
| N J RAY Properties Ltd | Hospitality | 2021 |
| N R Corp Limited | Arts & recreation | 2015 |
| Nafintra Ltd | Professional & scientific | 2026 |
| Nairdwood Properties Ltd | Real estate | 2014 |
| Nasreen Care Limited | Health & social care | 2021 |
| NAT Maher Ltd | Professional & scientific | 2019 |
| National Abrasives Ltd | Wholesale & retail | 2004 |
| National Adhesives Ltd | Manufacturing | 2023 |
| National Diploma in Beekeeping Examination Board Limited | Education | 2024 |
| Natura Elegantia Limited | Wholesale & retail | 2025 |
| Natural Heritage Capital Ltd | Financial services | 2019 |
| Nature Impact (Kensham) Ltd | Agriculture & fishing | 2024 |
| Nature Impact (Skinners) Ltd | Agriculture & fishing | 2024 |
| Nature Impact (Wrotham) Ltd | Agriculture & fishing | 2025 |
| Nature Impact Ltd | Professional & scientific | 2023 |
| Nature Reclaimed Limited | Manufacturing | 2020 |
| Naturehive Ltd | Wholesale & retail | 2025 |
| Nautilus Finance Limited | Financial services | 1998 |
| Navara Energy Ltd | Professional & scientific | 2020 |
| NCG Services Ltd. | Construction | 2020 |
| Neate Heating and Plumbing Ltd | Construction | 2019 |
| Neaves Lease Consultancy Limited | Real estate | 2024 |
| Neighborhood Ltd | Construction | 2021 |
| Neil Keegan Costs Ltd | Professional & scientific | 2018 |
| Neriah Property Solution Ltd | Real estate | 2026 |
| NES Projects Limited | Construction | 2010 |
| Nestcraft Projects Limited | Real estate | 2025 |
| Netcom IT Solutions Limited | Information & communication | 2005 |
| Netherne Water Tower Management Limited | Households | 2006 |
| Netherton Consulting Ltd | Professional & scientific | 2024 |
| New Britain International Ltd | Professional & scientific | 2025 |
| New ERA Beverages Limited | Manufacturing | 2026 |
| New HK Garden Ltd | Hospitality | 2024 |
| New Power Venture Ltd | Construction | 2021 |
| New Skies Ltd | Other services | 2020 |
| Newbanq Solutions Limited | Professional & scientific | 2008 |
| Newgamenewrules Ltd | Professional & scientific | 2023 |
| Newland Development Services Limited | Professional & scientific | 2016 |
| Newlands School Limited | Extraterritorial | 2014 |
| Newtonlea Ltd | Real estate | 1999 |
| Newtype Media Limited | Information & communication | 2010 |
| Nexus Data Centre Ltd | Information & communication | 2025 |
| NFP Forestry Ltd | Agriculture & fishing | 2021 |
| Niche Experience Limited | Administrative & support | 2024 |
| Nick Maxted Limited | Information & communication | 2016 |
| Nicola Jordan Consultancy Ltd | Professional & scientific | 2021 |
| Nigel Simpson Associates Limited | Administrative & support | 2002 |
| Nikevo Limited | Administrative & support | 2007 |
| NIKKITASTIC2 Ltd | Professional & scientific | 2022 |
| Niksan Ventures Ltd | Construction | 2024 |
| Nimana Ltd | Manufacturing | 2025 |
| Nimrod Healthcare Limited | Health & social care | 2011 |
| Nineteen Productions Limited | Administrative & support | 2021 |
| NINETY9 Ventures Limited | Real estate | 2026 |
| Ninfield Investments Ltd | Construction | 2019 |
| Ninja Systems Ltd | Wholesale & retail | 2026 |