| Nonna MIA Ltd | Wholesale & retail | 2026 |
| Noodles CRP Ltd | Hospitality | 2025 |
| Noor Store Ipswich Ltd | Wholesale & retail | 2026 |
| Norfolk and Suffolk Healthcare Limited | Health & social care | 2017 |
| Normalised Business Services Limited | Information & communication | 2000 |
| Norris Media Limited | Information & communication | 2018 |
| Norse Contracting Limited | Administrative & support | 2014 |
| North Acton BID Limited | Other services | 2025 |
| North Cleaners Ltd | Administrative & support | 2025 |
| North East Stays Limited | Real estate | 2023 |
| North Shore Consulting Limited | Education | 2022 |
| North Stand Homes Limited | Real estate | 2020 |
| Northcote Partners Ltd | Professional & scientific | 2026 |
| Northdown Systems Ltd | Administrative & support | 2017 |
| Northern Echo Apartments Ltd | Construction | 2019 |
| Northern Light Translations Limited | Professional & scientific | 2013 |
| Northern Spire Property Limited | Real estate | 2023 |
| Northern Spire Property Partners Investments Limited | Real estate | 2022 |
| Northern Steelworks & Fabrication Ltd | Professional & scientific | 2021 |
| Northern Wood Terminals Limited | Extraterritorial | 2008 |
| Northgate E K K a Limited | Arts & recreation | 2012 |
| Northgate Motors Limited | Wholesale & retail | 1973 |
| Northgate Taverns Limited | Hospitality | 2022 |
| Northgrade Limited | Arts & recreation | 2014 |
| Northwood (South Suffolk) Ltd | Real estate | 2016 |
| Norton and Sons Property Ltd | Real estate | 2024 |
| Norton Plastics Machinery Limited | Administrative & support | 2006 |
| Nortona Ltd | Extraterritorial | 2019 |
| Norvanta Learning Ltd | Professional & scientific | 2025 |
| Norwich Hand Car Wash Ltd | Other services | 2019 |
| Norwich House (Guildford) Limited | Construction | 2022 |
| Norwich House Guildford Operations Ltd | Real estate | 2025 |
| Norwich Road Cafe Bar Ltd | Hospitality | 2018 |
| Norwich Road Ipswich Ltd | Hospitality | 2019 |
| Norwich Road Portfolio Ltd | Real estate | 2014 |
| Norwich Training Centre Ltd | Education | 2024 |
| Nosegay Gardening & Cleaning Services Limited | Administrative & support | 2003 |
| Nossnoss Ltd | Wholesale & retail | 2023 |
| Nosurrenderfitness Ltd | Arts & recreation | 2025 |
| NOT Quite Past Ltd | Professional & scientific | 2024 |
| NOT Saints C.I.C. | Information & communication | 2019 |
| Notable Properties Limited | Real estate | 2025 |
| Nouveau Creative Ltd | Administrative & support | 2015 |
| Nova Brix Ltd | Wholesale & retail | 2025 |
| Nova Care Connect Limited | Administrative & support | 2022 |
| Nova Horizons Limited | Wholesale & retail | 2023 |
| Nova Tattoo & Laser Studios Ltd | Arts & recreation | 2020 |
| Novabond Limited | Wholesale & retail | 2024 |
| Novaed Ltd | Education | 2024 |
| Novagrid Media Limited | Professional & scientific | 2025 |
| Novak Transport Ltd | Transport & logistics | 2019 |
| Novamar Group Ltd | Wholesale & retail | 2024 |
| Novasoft Hub Ltd | Wholesale & retail | 2024 |
| Novelize Book Print Ltd. | Manufacturing | 2007 |
| Noveus Energy Limited | Professional & scientific | 2014 |
| Noveus Limited | Construction | 2006 |
| Novus Euro-Build Ltd | Construction | 2026 |
| Novustech Solutions Limited | Information & communication | 2024 |
| NOX Aviation Ltd | Transport & logistics | 2022 |
| NPK Homes Limited | Construction | 2015 |
| NR Food & Convenience Store Ltd | Wholesale & retail | 2026 |
| NRC (GBR) Ltd | Construction | 2017 |
| NRS Communications Ltd | Information & communication | 2007 |
| NSD Haulage Ltd | Transport & logistics | 2017 |
| Nsew Property Limited | Construction | 2020 |
| NSG Enterprise Solutions Ltd | Information & communication | 2023 |
| NSY UKS Ltd | Construction | 2022 |
| NT Food Store Ltd | Wholesale & retail | 2021 |
| Nt&T Limited | Health & social care | 2023 |
| NTR Admin & Consulting Ltd | Public administration | 2023 |
| NTY Prop Ltd | Real estate | 2023 |
| NU Alliance Group Ltd | Construction | 2020 |
| NU VUE Home Improvements Ltd | Construction | 2022 |
| Nuclear East Limited | Extraterritorial | 2024 |
| Nucleus Connection Limited | Other services | 2025 |
| Nuevolution Ltd | Administrative & support | 2023 |
| Nullmedia Limited | Extraterritorial | 2013 |
| Number Nineteen Consultancy Ltd | Real estate | 2022 |
| Number Plate Zone Ltd | Wholesale & retail | 2023 |
| Numptees Limited | Manufacturing | 2023 |
| Nunn Pro Brickwork Ltd | Construction | 2016 |
| Nunn Pro Holding Ltd | Financial services | 2022 |
| Nunn Pro Properties Ltd | Real estate | 2022 |
| Nuno Pinho Refurb Services Limited | Construction | 2026 |
| Nupur Ltd | Hospitality | 2008 |
| Nupur Pizza Ltd | Hospitality | 2008 |
| Nurse & Care Limited | Administrative & support | 2022 |
| Nurtured Hub Ltd | Information & communication | 2026 |
| Nuru Care Ltd | Health & social care | 2025 |
| Nuru Removal Ltd | Transport & logistics | 2025 |
| Nusrah Ltd | Wholesale & retail | 2023 |
| Nutrafusion UK Limited | Health & social care | 2025 |
| Nutrition by ME Limited | Health & social care | 2013 |
| Nutshells (East Anglia) Limited | Wholesale & retail | 2018 |
| Nuvera Home Ltd | Wholesale & retail | 2025 |
| Nuwco Ltd | Wholesale & retail | 2014 |
| NW Cluck'D Ltd | Hospitality | 2021 |
| NW Development Group Ltd | Construction | 2026 |
| NWA Planning Limited | Professional & scientific | 2002 |
| NXT GEN Group Ltd | Real estate | 2020 |