| MV JV Ltd | Hospitality | 2023 |
| Mvfit Ltd | Arts & recreation | 2026 |
| MVJ Limited | Financial services | 2012 |
| MVM Leisure Ltd | Hospitality | 2025 |
| Mweb Practice Limited | Health & social care | 2012 |
| MXN Developments Ltd | Construction | 2026 |
| My China Diner Ltd | Hospitality | 2025 |
| My Door Ltd | Wholesale & retail | 2023 |
| My Medical Support Community C.I.C. | Administrative & support | 2025 |
| My Plaice Gorleston Limited | Hospitality | 2016 |
| Myhills Holdings Limited | Wholesale & retail | 2017 |
| N J Short Engineering Limited | Manufacturing | 2014 |
| N-Ergise Inspection & Verification Ltd | Professional & scientific | 2026 |
| N-Ergise Limited | Professional & scientific | 2015 |
| N2 OIL and GAS Ltd | Mining & quarrying | 2011 |
| N21 Tyremarks Ltd | Wholesale & retail | 2018 |
| Nadia Bestiala Ltd | Construction | 2024 |
| Nakana Trading Ltd | Wholesale & retail | 2020 |
| Namshi Limited | Wholesale & retail | 2017 |
| Nancy Durrant (Mucky Pups) Limited | Other services | 2017 |
| NAS STA Properties Ltd | Real estate | 2019 |
| Nashville Truck & Trailer Limited | Wholesale & retail | 2025 |
| Nathan Ashton Welding Limited | Professional & scientific | 2015 |
| Native Fortress Limited | Hospitality | 2006 |
| Natural Aesthetics by Rebecca Jane Ltd | Other services | 2022 |
| Naturally RAW Dog Food Limited | Wholesale & retail | 2023 |
| Nautical Wealth Ltd | Professional & scientific | 2021 |
| NBV Enterprise Solutions Limited | Administrative & support | 1982 |
| NBV Property Management Ltd | Real estate | 2001 |
| Nbyco Ltd | Manufacturing | 2019 |
| Neaves Close Management Company Ltd | Households | 2020 |
| Nedvic Property Maintenance Limited | Real estate | 2016 |
| Neekmobile Ltd | Other services | 2023 |
| Neighbourhood Dining Ltd | Professional & scientific | 2019 |
| Neil Carter Consulting Services Ltd | Professional & scientific | 2025 |
| NEK Services Limited | Manufacturing | 2022 |
| Nelson County Construction Ltd | Construction | 2021 |
| Nelsons Commercial Maintenance Limited | Construction | 2008 |
| Nemea Investments Limited | Real estate | 2020 |
| Nemesis Consultants Limited | Administrative & support | 2012 |
| Neonat Ltd | Administrative & support | 2024 |
| Ness Point Properties Limited | Real estate | 2025 |
| Nestest Limited | Professional & scientific | 2008 |
| Neufollica Ltd | Wholesale & retail | 2025 |
| New B Limited | Professional & scientific | 2002 |
| New Bridge Garage Ltd | Wholesale & retail | 2022 |
| New Home Property Developments Limited | Real estate | 2013 |
| New Rock | Information & communication | 2020 |
| New Sage Restaurant Limited | Hospitality | 2021 |
| New Venture Landscapes Ltd | Administrative & support | 2016 |
| New World Cinema Ltd. | Information & communication | 2009 |
| Newer Heights Scaffolding Ltd | Construction | 2015 |
| Newlette Limited | Administrative & support | 2001 |
| Newstar Associates Limited | Real estate | 1999 |
| Newstar Retail Limited | Wholesale & retail | 2000 |
| Newton Choice Ltd | Wholesale & retail | 2025 |
| Nexcura Ltd | Information & communication | 2026 |
| Nexgen Dental Limited | Health & social care | 2017 |
| Nexius Limited | Construction | 2018 |
| Nextgenapparel Ltd | Manufacturing | 2017 |
| Nexus Finds Limited | Wholesale & retail | 2025 |
| NI Investments Holdings Limited | Real estate | 2025 |
| Nicholas Hospitality 1 Ltd | Hospitality | 2025 |
| Nicholas Hospitality 2 Ltd | Hospitality | 2025 |
| Nicholas Hospitality Ltd | Hospitality | 2024 |
| Nichols Restaurants Limited | Administrative & support | 1949 |
| Nicholsonross Enterprises Ltd | Hospitality | 2017 |
| Nicks Cars Ltd | Manufacturing | 2022 |
| Nicky Crawley Tennis Coaching Limited | Arts & recreation | 2015 |
| Nicola Albon Media Limited | Information & communication | 2004 |
| Nigel RIX Property Maintenance Limited | Construction | 2012 |
| Nigel Smith Trading Ltd | Other services | 2018 |
| Nightingale & Galen Ltd | Professional & scientific | 1984 |
| Ninchar Offshore Recruitment Ltd | Administrative & support | 2016 |
| NINETY9DESIGN Ltd | Professional & scientific | 2011 |
| Njjs Investment Company Limited | Financial services | 2020 |
| NJN Barbers Limited | Other services | 2017 |
| NJW Engineering Solutions Limited | Professional & scientific | 2021 |
| NKJ Marvel Ltd | Real estate | 2026 |
| NKS Properties(Felixstowe) Ltd | Real estate | 2025 |
| NL Home Improvments Limited | Construction | 2025 |
| NN Telecoms Ltd | Information & communication | 2018 |
| Noak Bridge Pharmacy Limited | Wholesale & retail | 2003 |
| Noble House (Great Yarmouth) Ltd | Hospitality | 2011 |
| Noble Wood Enterprises Ltd | Construction | 2025 |
| Nokkam Limited | Health & social care | 2023 |
| Nolloth Engineering Limited | Other services | 2013 |
| Nomaz Limited | Health & social care | 2018 |
| Nomaz Property Limited | Real estate | 2022 |
| NOR Height Assets Ltd | Administrative & support | 2023 |
| NOR Height Holdings Ltd | Financial services | 2023 |
| NOR Height Ltd | Wholesale & retail | 2019 |
| Norada Enterprise Ltd | Hospitality | 2023 |
| Norada Holdings Ltd | Real estate | 2024 |
| Norada PUB and Tavern Ltd | Hospitality | 2023 |
| Norfolk & Suffolk Roller Shutter Doors Limited | Construction | 2017 |
| Norfolk Air Conditioning Services Ltd | Construction | 2025 |
| Norfolk and Suffolk Podiatry Limited | Health & social care | 2015 |
| Norfolk and Waveney Enterprise Services | Administrative & support | 1982 |
| Norfolk Ants Ltd | Construction | 2016 |