| Mindset Momentum Ltd | Other services | 2020 |
| Minotaur Trading Ltd | Extraterritorial | 2016 |
| Minster Motors Limited | Transport & logistics | 1976 |
| Mistress Sea Charters Limited | Agriculture & fishing | 2007 |
| MJT Carpets & Flooring Ltd | Wholesale & retail | 2025 |
| Modern Haze Ltd | Wholesale & retail | 2026 |
| Mountain Holt Investments Ltd | Financial services | 2020 |
| MRA Holdings (UK) Ltd | Financial services | 2015 |
| MSB Heating & Plumbing Ltd | Construction | 2019 |
| Muthapuppa Ltd | Wholesale & retail | 2021 |
| My Architectural Service Ltd | Extraterritorial | 2016 |
| N and M Education Ltd | Education | 2024 |
| Naish Property Services Ltd | Construction | 2024 |
| Nakd Fitness (Holdings) Limited | Financial services | 2018 |
| Nakd Fitness (Outwell) Limited | Health & social care | 2022 |
| Nakd Fitness Limited | Arts & recreation | 2018 |
| Nathosca Holdings Limited | Information & communication | 2008 |
| NB Decorating Services Ltd | Construction | 2023 |
| Neil Minns & Co Limited | Professional & scientific | 2006 |
| Nelson House Management Company (NO. 2) Limited | Households | 2011 |
| New Whip UK Ltd | Wholesale & retail | 2022 |
| Nicotine Nation Limited | Wholesale & retail | 2023 |
| NJC Utilities & Construction Limited | Construction | 2007 |
| Noozu Limited | Information & communication | 2003 |
| Norfolk Building Specialists Ltd | Real estate | 2020 |
| Norfolk Construction & Groundworks Ltd | Construction | 2022 |
| Norfolk Container Services Ltd | Transport & logistics | 2025 |
| Norfolk Estate Investments Ltd | Real estate | 2023 |
| Norfolk Estate Management Services Ltd | Real estate | 2023 |
| Norfolk Farm Leisure Limited | Hospitality | 2018 |
| Norfolk Grounds Maintenance Ltd | Administrative & support | 2025 |
| Norfolk Pride Developments Limited | Construction | 2004 |
| Norfolk Pride Estates Ltd | Real estate | 2008 |
| Norfolk Renovations Ltd | Construction | 2013 |
| Norfolking Around Ltd | Wholesale & retail | 2020 |
| Nu-Build (Norfolk) Ltd | Construction | 2022 |
| Nursery Drive Management Company Limited | Households | 2023 |
| O'Brien Enterprises Limited | Professional & scientific | 1991 |
| Oakland Trading Ltd | Wholesale & retail | 2013 |
| Oakwood Property Rentals Limited | Real estate | 2024 |
| Octagon Computer Generated Images Ltd | Real estate | 2016 |
| Officescape Business Interiors LLP | | 2008 |
| OJG Electrical Ltd | Energy | 2014 |
| Old Hall Farm Company Limited | Agriculture & fishing | 1949 |
| Omex Agrifluids Limited | Manufacturing | 1991 |
| One Studio Hair & Beauty Ltd | Other services | 2016 |
| Onsite Electrical Limited | Construction | 2007 |
| Onyx Gymnastics Ltd | Education | 2021 |
| P.K.S. (Construction) Limited | Construction | 1974 |
| Packer Industrial Limited | Extraterritorial | 2020 |
| Paint Red Limited | Administrative & support | 2008 |
| Palm Paper Limited | Manufacturing | 1964 |
| Palm Recycling Limited | Water & waste | 2010 |
| Party Wall Consulting Limited | Professional & scientific | 2013 |
| Parworth Inns Limited | Hospitality | 2006 |
| Parworth Limited | Real estate | 2003 |
| Passion Taverns Ltd | Hospitality | 2019 |
| Pattern Services (UK) Ltd | Manufacturing | 2003 |
| Paulroy Services Ltd | Extraterritorial | 2014 |
| Payne Pallet Inverters Limited | Manufacturing | 1994 |
| PCD Builders Ltd | Construction | 2014 |
| PCD Estates Ltd | Construction | 2017 |
| Penguin Hygiene Limited | Extraterritorial | 2020 |
| Penson Holdco Ltd | Financial services | 2026 |
| Pentad-Se Ltd | Information & communication | 2008 |
| Pentagon Amenity Marketing Limited | Wholesale & retail | 1999 |
| Pentney Farms Limited | Agriculture & fishing | 1965 |
| People Reflect Ltd | Administrative & support | 2007 |
| Pharmadelivery Solutions Limited | Professional & scientific | 2003 |
| Pharminox Isolation Ltd | Professional & scientific | 2013 |
| Phoenix Fresh Produce Consultancy Ltd | Professional & scientific | 2025 |
| Pink Moves Ltd | Transport & logistics | 2024 |
| Plann:D Ltd | Other services | 2021 |
| Pmds Kreative Kollection Ltd | Manufacturing | 2025 |
| Polar Systems Limited | Manufacturing | 1986 |
| PORT3 Engineering Limited | Administrative & support | 2011 |
| Portmanteaux Ltd | Manufacturing | 2021 |
| Porvair PLC | Manufacturing | 1982 |
| Positively Hair Limited | Wholesale & retail | 2017 |
| Pro Build Norfolk Ltd | Construction | 2014 |
| Q.R.C. (Norfolk) Limited | Professional & scientific | 2013 |
| Qatec Solutions Ltd | Professional & scientific | 2017 |
| QCM Care C.I.C. | Public administration | 2023 |
| Quayside Renovations Ltd | Construction | 2020 |
| Qube Construction (Norfolk) Ltd | Construction | 2024 |
| R & B Consultancy Services Limited | Professional & scientific | 2017 |
| R.D Plumbing & Heating Solutions Ltd | Construction | 2025 |
| R.W.Walpole Limited | Agriculture & fishing | 1981 |
| Rainbow Amusement Arcades Ltd | Arts & recreation | 2024 |
| Ramidus Consulting Limited | Administrative & support | 2003 |
| RBG Car Deals Ltd | Wholesale & retail | 2023 |
| RBM Properties (Narborough) Limited | Construction | 1977 |
| Real Build Construction Services Ltd | Construction | 2021 |
| Red Sky Properties (Norfolk) Ltd | Construction | 2021 |
| Redroc Estates Ltd | Real estate | 2024 |
| Redroc Group Ltd | Construction | 2021 |
| Reeve Design Ltd | Professional & scientific | 2018 |
| Reflections Hair & Beauty Ltd | Other services | 2013 |
| Regis V P Ltd | Professional & scientific | 2022 |
| Resilient Accounting Ltd | Professional & scientific | 2022 |