| Norfolk Drywall Group Limited | Construction | 2024 |
| Normand Associates Limited | Real estate | 1976 |
| Normire Ltd | Wholesale & retail | 2022 |
| Norst Ltd | Manufacturing | 2022 |
| North Chailey One Residents Company Limited | Households | 2017 |
| North Colchester Business Incubation Centre C.I.C. | Administrative & support | 2010 |
| North Colchester PCN Limited | Health & social care | 2024 |
| North East Essex Building Company Limited | Extraterritorial | 2002 |
| North Essex Developments Limited | Construction | 2023 |
| North Essex Forklifts Ltd | Manufacturing | 2010 |
| North Essex Medical Properties Ltd | Administrative & support | 2017 |
| North Essex Property Holdings Ltd | Construction | 2023 |
| North Essex Render School Limited | Education | 2023 |
| North Essex Render Services Limited | Construction | 2023 |
| North Essex Render Supplies Limited | Administrative & support | 2021 |
| North Essex Signs Limited | Manufacturing | 1994 |
| North Essex Tyres Limited | Wholesale & retail | 2009 |
| North Green Homes Limited | Construction | 2004 |
| North Hill Accountants Limited | Professional & scientific | 2014 |
| North Hill Food Ltd | Hospitality | 2024 |
| North Hill Holdings Ltd | Real estate | 2019 |
| North Hill Management Ltd | Real estate | 2018 |
| North Hill Surgery Limited | Health & social care | 2006 |
| North Hill Surgery One Limited | Health & social care | 2016 |
| North Island Development Ltd | Hospitality | 2024 |
| North Star Childminder Services Ltd | Health & social care | 2020 |
| North Station Food Ltd | Hospitality | 2023 |
| North Station Road (115 to 150) Management Co. Limited | Households | 1988 |
| North Writing Services Ltd | Arts & recreation | 2018 |
| NORTH54 Consulting Limited | Professional & scientific | 2022 |
| Northgate Heritage Ltd | Professional & scientific | 2018 |
| Northgate Property Services Ltd | Construction | 2019 |
| Northstar (Communications & Marketing) Ltd. | Professional & scientific | 2020 |
| Northstar Benson Limited | Health & social care | 2015 |
| Northstar Pulse Limited | Wholesale & retail | 2026 |
| Norton Folgate Holdings Limited | Professional & scientific | 2007 |
| Norton Folgate Marketing Ltd | Wholesale & retail | 1997 |
| Norton Welding Ltd | Construction | 2022 |
| Nortown Beverage Ltd | Hospitality | 2024 |
| Nortown Rooms Ltd | Hospitality | 2024 |
| Norwich Mortgage Centre Ltd | Financial services | 2018 |
| NOS 7-12 Manningtree RD, Management Company Limited | Households | 2018 |
| Nosh Tech Ltd. | Information & communication | 2022 |
| Nost UK Support Limited | Professional & scientific | 2018 |
| Nostimo Delicatessen Ltd | Wholesale & retail | 2015 |
| Notable Drylining Limited | Administrative & support | 2017 |
| Notts Outreach Limited | Health & social care | 2009 |
| Nouman's Emarket Ltd | Wholesale & retail | 2023 |
| Nous Technology Limited | Information & communication | 2010 |
| Nova Content Ltd | Information & communication | 2023 |
| Nova Engineering Limited | Energy | 2003 |
| Nova SEC Services Ltd | Administrative & support | 2025 |
| Novafutures Ltd | Wholesale & retail | 2025 |
| Novasai Limited | Information & communication | 2026 |
| Novelle Group Ltd | Administrative & support | 2026 |
| Novex (UK) Ltd | Wholesale & retail | 2015 |
| Novidell Limited | Wholesale & retail | 2014 |
| Novo Studios Ltd | Information & communication | 2023 |
| Novr Studio Limited | Information & communication | 2025 |
| Novum Partnership Limited | Financial services | 2022 |
| Novumldn Ltd | Wholesale & retail | 2026 |
| Novus Actuarial & Administration LLP | | 2004 |
| Novus Black Ltd | Financial services | 2021 |
| Nowhere Known Ltd | Administrative & support | 2026 |
| Nowton Apartments Management Company Limited | Households | 2011 |
| Npaa Warehouse Services Ltd | Transport & logistics | 2021 |
| NPG Barron Building Services Ltd | Construction | 2022 |
| Npoku Construction Ltd | Construction | 2025 |
| NRD Financial Consultancy Limited | Financial services | 2018 |
| NRG City Ltd | Financial services | 2017 |
| NRG Consulting (GB) Ltd | Professional & scientific | 2010 |
| NRG Home Retail Ltd | Real estate | 2017 |
| NRG Planning Ltd | Professional & scientific | 2017 |
| NRG PV Ltd | Professional & scientific | 2016 |
| NRG Subfloor Systems Ltd | Construction | 2024 |
| Nrgetic Ltd | Professional & scientific | 2025 |
| Nrsr Services Limited | Construction | 2010 |
| NS Primary Care Services Ltd | Health & social care | 2026 |
| NS2A Global Trading (UK) Ltd | Wholesale & retail | 2025 |
| Nscp LLP | | 2003 |
| NSF Property Limited | Real estate | 2017 |
| NSI (Euro) Ltd | Manufacturing | 2007 |
| Nslookup Ltd | Information & communication | 2023 |
| NSN Caribbean Street Food Ltd | Hospitality | 2026 |
| NST Property Management Ltd | Real estate | 2022 |
| NTA Properties Limited | Financial services | 2018 |
| NTH Ground Investigation Support Ltd | Professional & scientific | 2026 |
| NU Trendz Hair and Beauty Ltd | Other services | 2023 |
| Nu-Wave Services Limited | Construction | 2025 |
| Nubo Plumbing & Property Maintenance Ltd | Construction | 2024 |
| Nudge Drinks Limited | Wholesale & retail | 2014 |
| Nudge Events Limited | Administrative & support | 2005 |
| Nuhealth Care Services Ltd | Health & social care | 2023 |
| Number 12 Limited | Administrative & support | 2020 |
| Number 8 Solutions Ltd | Administrative & support | 2007 |
| Numberdate Property Management Limited | Households | 1996 |
| Numical Accounts Limited | Professional & scientific | 2025 |
| Nun's Green (Great Yeldham) Management Company Limited | Households | 2021 |
| Nunkoo Practitioner Limited | Health & social care | 2023 |
| Nuphoenix Limited | Professional & scientific | 2023 |