| Mustang Tools Limited | Extraterritorial | 1967 |
| Mxam Distributions Limited | Wholesale & retail | 2025 |
| N7 Properties Limited | Construction | 2005 |
| N7 Property Solutions Ltd | Real estate | 2019 |
| Natures Love Limited | Wholesale & retail | 2003 |
| Neil Williams Holdings Limited | Construction | 2024 |
| Neochic Digital Ltd | Information & communication | 2025 |
| New Stages Projects CIC | Education | 2021 |
| Newnham Installations Limited | Manufacturing | 2012 |
| Newnham Structures Ltd | Construction | 2009 |
| Nextfan Limited | Real estate | 1999 |
| Nico Electrical Contracting Limited | Construction | 2022 |
| Nigel Mervyn Webber Limited | Extraterritorial | 2024 |
| Nitrogen Well Services Ltd | Mining & quarrying | 2003 |
| Norfolk Beauty Ltd | Other services | 2019 |
| Norfolk Binding Ltd | Manufacturing | 2025 |
| Norfolk Cleaning Group Ltd | Professional & scientific | 2015 |
| Norfolk Cleaning Ltd | Administrative & support | 2008 |
| Norfolk Coastal Cleaning Ltd | Administrative & support | 2019 |
| Norfolk Gleam Clean Ltd | Administrative & support | 2025 |
| Norfolk Laundry Services Limited | Extraterritorial | 2010 |
| Norfolk Linen Hire Ltd | Administrative & support | 2020 |
| Norfolk Paranormal UK Ltd | Arts & recreation | 2024 |
| Norfolk Raws Pet Food Ltd | Wholesale & retail | 2024 |
| Norgate Builders Limited | Construction | 2000 |
| Norman MAY (Knapton) Limited | Agriculture & fishing | 1961 |
| North Norfolk Community Transport | Transport & logistics | 2000 |
| North Norfolk Conservative Holdings Limited | Real estate | 1960 |
| North Norfolk Property Holdings Ltd | Real estate | 2024 |
| North Walsham Carpentry Ltd | Construction | 2013 |
| North Walsham Chiropractic Clinic | Health & social care | 2006 |
| North Walsham Gymnastics Club | Arts & recreation | 2015 |
| North Walsham Scaffolding Limited | Construction | 2008 |
| North Walsham Signs Ltd | Manufacturing | 2011 |
| Northern Ocean Star Ltd | Hospitality | 2023 |
| Northwalshamvans Ltd | Wholesale & retail | 2025 |
| Norwich 100 Ltd | Other services | 2025 |
| Nourish Co Vending Ltd | Wholesale & retail | 2025 |
| NR Heating & Plumbing Ltd | Construction | 2018 |
| NW Hand Car Wash Limited | Other services | 2024 |
| NW Rentals LLP | | 2016 |
| Oak Tree Norwich Ltd | Hospitality | 2026 |
| Oakden Engineering Limited | Extraterritorial | 2016 |
| Oasis Agriculture Limited | Professional & scientific | 1994 |
| Ogfba Limited | Wholesale & retail | 2023 |
| Oilfield Supplies and Services Limited | Manufacturing | 2008 |
| Oldub Ltd | Information & communication | 2024 |
| One BAG Enterprise Ltd | Wholesale & retail | 2018 |
| One Eighty Partners Ltd | Professional & scientific | 2025 |
| Orchard PH Ltd | Hospitality | 2009 |
| Oren Enterprise Ltd | Wholesale & retail | 2025 |
| OSS Leisure Swim School Ltd | Education | 2017 |
| P & P Professional Farmers Limited | Agriculture & fishing | 1985 |
| P G Products Ltd. | Manufacturing | 1969 |
| P P Auto Limited | Wholesale & retail | 2013 |
| P S ELY Ltd | Professional & scientific | 2009 |
| Paddy Wagon Grooming Ltd | Other services | 2025 |
| Parallax Keyboards Limited | Wholesale & retail | 2023 |
| Passmore Property Rentals Limited | Real estate | 2015 |
| Paterson AG Limited | Agriculture & fishing | 2012 |
| Paterson Farming Partnership Ltd | Agriculture & fishing | 2018 |
| Pathfinder Management Ltd | Professional & scientific | 2017 |
| Pauls 24/7 Emergency Plumbing & GAS (Norfolk) Ltd | Construction | 2026 |
| Paygora Limited | Information & communication | 2017 |
| Peninsula Site Management Limited | Real estate | 2024 |
| Performance and Classic Cars Ltd. | Wholesale & retail | 2016 |
| Performance Solutions & Plant Repairs Ltd | Manufacturing | 2023 |
| Pivotal Solutions Ltd. | Information & communication | 2000 |
| Pixnet Control Limited | Manufacturing | 2022 |
| Pkprestige Ltd | Wholesale & retail | 2023 |
| Pledge Point Ltd | Professional & scientific | 2025 |
| PMC Consultancy Services Limited | Construction | 2015 |
| Polynova PMC Limited | Wholesale & retail | 2020 |
| PPA Property Ltd | Real estate | 2017 |
| PPL Investments Limited | Real estate | 2014 |
| PPL Property Investments Ltd | Construction | 2014 |
| Profit by Design Ltd | Professional & scientific | 2021 |
| Promotional Product World Limited | Manufacturing | 2008 |
| Property Caretakers Ltd | Households | 2024 |
| PTS Group (Norfolk) Limited | Transport & logistics | 2016 |
| Pura Vida Pans Limited | Hospitality | 2025 |
| Quantrill Partners Ltd | Professional & scientific | 2018 |
| Quill Holdings Limited | Financial services | 2026 |
| R Bell Firewood Ltd | Agriculture & fishing | 2014 |
| R Bell UK Ltd | Administrative & support | 2006 |
| R R Payne Ltd | Professional & scientific | 2025 |
| Rainbow Children's Nursery Limited | Education | 1999 |
| Rainbow Rags Cleaning Services Limited | Administrative & support | 2023 |
| Randell Agriculture Limited | Wholesale & retail | 1978 |
| RBR Properties Limited | Real estate | 2011 |
| Redding Civil Construction Limited | Construction | 2006 |
| Reeve Electrical Ltd | Professional & scientific | 2015 |
| Remembering Together CIC | Health & social care | 2024 |
| Remy John's Ltd | Administrative & support | 2022 |
| Rentals Direct Plus Limited | Administrative & support | 2009 |
| Resourceability Limited | Construction | 2010 |
| RFH (Norfolk) Limited | Financial services | 2020 |
| RM Heating Services Ltd | Construction | 2018 |
| RMC Care Services LLP | | 2012 |
| RMC Partners Ltd | Administrative & support | 2014 |