| Nirvana Managed Services Ltd | Administrative & support | 2024 |
| Nisbett LLP | | 2022 |
| Nisi Management Limited | Professional & scientific | 2014 |
| Nivi & SU Limited | Hospitality | 2020 |
| NIX FD Solutions Limited | Professional & scientific | 2025 |
| Niyama Limited | Professional & scientific | 2021 |
| Njhd Consulting Limited | Professional & scientific | 2024 |
| NJO Property Holdings Ltd | Real estate | 2023 |
| NJW Group Limited | Financial services | 2020 |
| NK Building Consultancy Limited | Professional & scientific | 2020 |
| Nkeys Ltd | Real estate | 2023 |
| NKI Digital Limited | Information & communication | 2022 |
| NKM Trading Limited | Professional & scientific | 2022 |
| NKT Bars Ltd | Hospitality | 2011 |
| NKT Projects Ltd | Construction | 2019 |
| NLB Investments Ltd | Households | 2025 |
| Nlist Limited | Professional & scientific | 2018 |
| Nlnh Limited | Professional & scientific | 2016 |
| NM Trustees Limited | Professional & scientific | 1997 |
| NME Developments Limited | Information & communication | 2026 |
| NMK Services Limited | Professional & scientific | 2017 |
| Nmlh Limited | Professional & scientific | 2021 |
| NNB Properties Limited | Real estate | 2016 |
| Nnerg Group Limited | Professional & scientific | 2018 |
| Nni-Klar Mach Limited | Financial services | 2026 |
| NO 3 Pubs UK Limited | Hospitality | 2025 |
| NO 36 Westbourne Terrace Management Company Limited | Households | 1969 |
| NO Pause Ltd | Professional & scientific | 2022 |
| NO Small Measure Consulting Limited | Professional & scientific | 2024 |
| NO. 3 Heald Road Management Company Limited | Households | 1989 |
| NO. 6 Heald Road Management Company Limited | Households | 1989 |
| Noair Limited | Wholesale & retail | 2026 |
| Noble Corporation 2022 Limited | Mining & quarrying | 2020 |
| Noble Corporation PLC | Mining & quarrying | 2020 |
| Noble Drilling UK Ltd | Mining & quarrying | 2011 |
| Noble Highlander UK Ltd | Mining & quarrying | 2016 |
| Noble Holdco (UK) Limited | Financial services | 2024 |
| Noble Holding Land Support Limited | Mining & quarrying | 2016 |
| Noble International Group Limited | Wholesale & retail | 2018 |
| Noble Ndus Holdings UK Limited | Mining & quarrying | 2022 |
| Noble Ndus UK Leasing Limited | Mining & quarrying | 2022 |
| Noble Ndus UK Ltd | Mining & quarrying | 2022 |
| Noble NEC Holdings Limited | Financial services | 2019 |
| Noble Offshore Drilling (UK) Ltd | Mining & quarrying | 1992 |
| Noble Two Ltd | Real estate | 2024 |
| Node Capital Venture Two L.P. | | 2024 |
| Noir Barber Shop Limited | Other services | 2025 |
| Noir by Noir Limited | Other services | 2025 |
| Nolan Software Limited | Information & communication | 2022 |
| Nolava Consulting Limited | Professional & scientific | 2024 |
| Nomad Consultants Ltd. | Information & communication | 2019 |
| Nomad Luggage Limited | Wholesale & retail | 2024 |
| Nomad Tech Ltd | Information & communication | 2018 |
| Nominal IT Limited | Professional & scientific | 2024 |
| Noobon Limited | Information & communication | 2016 |
| Nook and Key Holdings Limited | Administrative & support | 2017 |
| Noord Developments Limited | Real estate | 2023 |
| Nord Digital Consultancy Limited | Professional & scientific | 2021 |
| Nordhavn Ltd | Wholesale & retail | 2025 |
| Norit UK Acqco Limited | Financial services | 2022 |
| Normal Computing UK Ltd | Professional & scientific | 2024 |
| Normally Enterprise Limited | Professional & scientific | 2023 |
| Normanby Consultancy Limited | Real estate | 2010 |
| Norney Holdings Limited | Professional & scientific | 2015 |
| Norse Projekts Ltd | Wholesale & retail | 2025 |
| North AI Ltd | Information & communication | 2023 |
| North Bridge Advisory Ltd | Professional & scientific | 2026 |
| North by Northwest Consultants Limited | Information & communication | 2016 |
| North Cheshire Management Consultants Limited | Administrative & support | 2001 |
| North Eagle Star Limited | Administrative & support | 2006 |
| North House Consulting Limited | Professional & scientific | 2025 |
| North Vision UK Ltd | Real estate | 2019 |
| North West Coffee Limited | Hospitality | 2008 |
| North West Land and Planning Ltd | Extraterritorial | 2017 |
| North West Lung Centre | Health & social care | 2000 |
| North West Luxury Beds Limited | Wholesale & retail | 2024 |
| North West Parcel Ltd | Transport & logistics | 2026 |
| North Western Trading Limited | Wholesale & retail | 2023 |
| Northenden Court Management Limited | Construction | 1992 |
| Northern Architects Limited | Professional & scientific | 2023 |
| Northern Bearing Limited | Information & communication | 2011 |
| Northern Independent Medical Services Limited | Health & social care | 2015 |
| Northern Inventions Ltd | Professional & scientific | 2010 |
| Northern Packaging Holdings Limited | Manufacturing | 2015 |
| Northern Packaging Limited | Manufacturing | 1980 |
| Northern Residential Ltd | Real estate | 2025 |
| Northern Safety Signs Limited | Wholesale & retail | 1997 |
| Northern Technical Recruitment Limited | Administrative & support | 1976 |
| Northlands Management Limited | Professional & scientific | 1981 |
| Northstar Broadcast Services Limited | Financial services | 2025 |
| Northstar Delta Consulting Limited | Professional & scientific | 2025 |
| Northstar Media Ltd | Financial services | 2017 |
| Northumberland Stain Away Ltd | Administrative & support | 2025 |
| Northumbria Coast and Country Cottages Limited | Real estate | 2000 |
| Northwest Hongkongers Professional Network Limited | Other services | 2025 |
| Northwest Medics Ltd | Health & social care | 2026 |
| Northwold House Management Co Limited | Households | 2000 |
| Northwood EYE Clinic Limited | Health & social care | 2011 |
| Norton Car & Van Hire Limited | Administrative & support | 2005 |
| Norwell Construction Ltd | Construction | 2018 |