| Modus MA Ltd | Professional & scientific | 2022 |
| Moglie Limited | Wholesale & retail | 2018 |
| Molloy Developers Limited | Construction | 1988 |
| Moltexflex Limited | Professional & scientific | 2022 |
| Monkeyfisk Ltd | Professional & scientific | 2025 |
| Monochrome Vehicle Sales Ltd | Wholesale & retail | 2021 |
| Montgomery Maxwell Commercial Finance Limited | Financial services | 2025 |
| Moodbox Ecom Ltd | Wholesale & retail | 2025 |
| Moodbox Limited | Wholesale & retail | 2013 |
| Moose Investments Ltd | Real estate | 2020 |
| Morel Restaurant Limited | Hospitality | 2023 |
| Morgs Design Limited | Professional & scientific | 2025 |
| Motor Industry Communicators Ltd | Other services | 2021 |
| Motor Trade Online Ltd | Wholesale & retail | 1986 |
| Motorail (UK) Limited | Manufacturing | 2004 |
| Mototcs Limited | Professional & scientific | 2009 |
| Motta Living Ltd | Professional & scientific | 2021 |
| Mould Works Ltd | Wholesale & retail | 2024 |
| Mouve Clothing Ltd | Wholesale & retail | 2026 |
| Movara AI Limited | Information & communication | 2025 |
| Mowat Business Intelligence Ltd | Information & communication | 2023 |
| MPS UK Services Ltd | Transport & logistics | 2018 |
| MS Chipping Norton Ltd | Other services | 2026 |
| Msau Limited | Real estate | 2025 |
| MSG Building Services Limited | Construction | 2010 |
| Msjd Ltd | Hospitality | 2017 |
| MSS Energy Ltd | Professional & scientific | 2022 |
| Mtechnical Limited | Information & communication | 2009 |
| MTM Hold Co Ltd | Financial services | 2024 |
| MTS Electrical 2018 Ltd | Construction | 2018 |
| Mucking About Ltd | Health & social care | 2023 |
| MUD Hutter Properties Limited | Real estate | 2014 |
| Muddy Munchkins Ltd | Health & social care | 2023 |
| Mulberry Court Limited | Administrative & support | 2005 |
| Mulberry Froud Associates Limited | Professional & scientific | 2010 |
| Mulberry Management Investment Ltd | Professional & scientific | 2016 |
| Mutton's Country Store Limited | Wholesale & retail | 2018 |
| MV Cleans Ltd | Administrative & support | 2026 |
| MVC Pro Cleaning Solution Limited | Administrative & support | 2025 |
| MW Accounting & Consultancy Ltd | Professional & scientific | 2024 |
| MW Produce Ltd | Wholesale & retail | 2026 |
| My Art Project Limited | Information & communication | 2012 |
| My Hospitality Partners Ltd | Professional & scientific | 2024 |
| Myltech Services Limited | Professional & scientific | 2006 |
| Myroutine Limited | Manufacturing | 2023 |
| N S Health Ltd | Other services | 2024 |
| Nabu Industries Limited | Manufacturing | 2013 |
| Nana's Caff Limited | Hospitality | 2024 |
| Natdave Investments Ltd | Construction | 2019 |
| National Specialist Canine Training Organisation Ltd | Education | 2023 |
| Naunton Lodge Management Company Limited | Households | 2021 |
| Navigate Limited | Wholesale & retail | 2001 |
| Naylor Fine Foods Limited | Hospitality | 2012 |
| ND2 Consulting Ltd | Professional & scientific | 2024 |
| NDB 1234 Limited | Information & communication | 2024 |
| Neat Home Ltd | Manufacturing | 2019 |
| Needan Limited | Real estate | 2016 |
| Neil Mcmillan Consulting Limited | Construction | 2016 |
| Neil Monk Limited | Construction | 2011 |
| Neil Wypior Ltd | Professional & scientific | 2022 |
| Nelson's Wharf (Stockton) Limited | Real estate | 2016 |
| Neon Node Limited | Information & communication | 2019 |
| NET Visibility Web Marketing Limited | Information & communication | 2011 |
| NETB4 Ltd | Information & communication | 2017 |
| Netham Bamboo Limited | Wholesale & retail | 2019 |
| Nevis Stables Ltd | Manufacturing | 2024 |
| New Dawn Associates (UK) Limited | Professional & scientific | 2014 |
| New HAT Limited | Information & communication | 2000 |
| New Homes for Sale .Co.Uk Limited | Information & communication | 1995 |
| New Space Productions Ltd | Arts & recreation | 2023 |
| New Terrain Limited | Professional & scientific | 1999 |
| New Touch Plus Ltd | Other services | 2025 |
| New Tower Investments NO 2 Limited | Real estate | 2018 |
| Newbold Solutions Limited | Information & communication | 2010 |
| Newborough Investments Limited | Financial services | 2019 |
| Newco January 2021 Ltd | Public administration | 2019 |
| Newhouse Farm Business Centre Limited | Real estate | 2008 |
| Newson Health Limited | Health & social care | 2017 |
| Newson Media Limited | Health & social care | 2015 |
| Newson Partnerships Ltd | Other services | 2025 |
| Nexabyte Ltd | Information & communication | 2024 |
| Nextcamino Ltd | Information & communication | 2016 |
| NG Yuet SAR (Restaurant) Limited | Real estate | 1966 |
| Nhre Ltd | Health & social care | 2019 |
| NIC Shaw Consulting Limited | Professional & scientific | 2016 |
| Niche Wardrobe Ltd | Wholesale & retail | 2023 |
| Nicholls Breslin Limited | Professional & scientific | 2025 |
| Nick Castle Design Ltd | Professional & scientific | 2022 |
| Nick Welton Polymer & Coatings Consultancy Ltd | Professional & scientific | 2015 |
| Nightingale Property Limited | Real estate | 2025 |
| Nimbus Digital & Technology Innovations Ltd | Information & communication | 1997 |
| Ninetree Music Ltd | Information & communication | 2025 |
| NLJ Limited | Health & social care | 2015 |
| NNS Staffing Ltd | Health & social care | 2025 |
| NO Ordinary Pigeon Limited | Professional & scientific | 2025 |
| Noahs Nook Limited | Hospitality | 2026 |
| North Beach Holdings Limited | Financial services | 2024 |
| North East Campervans Limited | Wholesale & retail | 2023 |
| North MA Ltd | Information & communication | 2025 |
| North Quay Management Limited | Households | 1984 |