| NC Recycling Limited | Information & communication | 2015 |
| NCF (Norwich) Ltd | Real estate | 2023 |
| NCL Contractors Ltd | Construction | 2013 |
| NCL Technical Ltd | Information & communication | 2026 |
| NCM Consulting Ltd | Professional & scientific | 2017 |
| Ncm-Cl Limited | Administrative & support | 2023 |
| NCP Crowes Holdings Limited | Manufacturing | 2011 |
| NCW Commercial Ltd | Administrative & support | 2022 |
| ND Willan Building Contractors Ltd | Construction | 1990 |
| ND Willan Construction Ltd | Construction | 2017 |
| NDB Autos Ltd | Wholesale & retail | 2025 |
| Ndbf Easton Limited | Construction | 2014 |
| NDE Properties Ltd | Real estate | 2024 |
| NDI Insurance & Reinsurance Brokers Limited | Financial services | 2002 |
| NDI Insurance Brokers (UK) Limited | Financial services | 2008 |
| NDI London Markets Limited | Financial services | 2011 |
| NDI Takaful & Retakaful Limited | Financial services | 2012 |
| NDS Homes Property Management Limited | Real estate | 2024 |
| NDT Insight Ltd | Professional & scientific | 2025 |
| NDT Mortgages Limited | Financial services | 2018 |
| NDW Commercial Limited | Construction | 2024 |
| NDW Holdings Limited | Financial services | 2019 |
| NDW Surveys Ltd | Construction | 2018 |
| Nearly Festival UK Limited | Information & communication | 2024 |
| Neat Accounts Limited | Professional & scientific | 2023 |
| Neath Hill Autos Limited | Wholesale & retail | 1992 |
| Neatishead Boatyard Limited | Administrative & support | 1955 |
| Nebert Ltd | Extraterritorial | 2007 |
| Necto Build Ltd | Construction | 2021 |
| Necton Labour Services Limited | Hospitality | 2008 |
| Neda Surgical Solutions Limited | Health & social care | 2024 |
| Needham Market (Bursar's Walk) Management Company Limited | Households | 2004 |
| Needle Holdings Ltd | Extraterritorial | 2023 |
| Needlecraft Wymondham Limited | Wholesale & retail | 2024 |
| Needwood Properties Limited | Real estate | 2020 |
| Neelakanth Ltd | Real estate | 2025 |
| Negus Health Care Ltd | Health & social care | 2016 |
| Neighbourhood Brew Co Ltd | Manufacturing | 2022 |
| Neil Campbell Performance Ltd | Education | 2025 |
| Neil Coleman Crown and Bridge Ltd | Health & social care | 2016 |
| Neil Coman Productions Ltd | Information & communication | 2009 |
| Neil FOX Limited | Financial services | 2004 |
| Neil Gannon Marketing Ltd | Professional & scientific | 2015 |
| Neil John Hendrey Limited | Other services | 2016 |
| Neil Smith (Export Services) Limited | Manufacturing | 1978 |
| Neil Wilson Associates Limited | Professional & scientific | 2003 |
| Nektar Consulting Ltd | Professional & scientific | 2010 |
| Neligo Ltd | Health & social care | 2022 |
| Nelisha Limited | Health & social care | 2014 |
| Nellie's Nursery Limited | Education | 2015 |
| Nelson Developments Limited | Real estate | 2005 |
| Nelson Media Limited | Information & communication | 2006 |
| Nelson Museum | Arts & recreation | 2001 |
| Nelson Pizza Ltd | Hospitality | 2023 |
| Nelson Road 15 Ltd | Real estate | 2022 |
| Nelson Road 18 Ltd | Real estate | 2022 |
| Nelson Road 19 Ltd | Real estate | 2022 |
| Nelson Stokes Limited | Manufacturing | 1976 |
| Nelson Street Properties Limited | Real estate | 2003 |
| Nelson's Patch Ltd | Hospitality | 2020 |
| Nelsonspirit Limited | Professional & scientific | 1993 |
| Nelton Finest Ltd | Administrative & support | 2015 |
| Nema & Sons Ltd | Transport & logistics | 2013 |
| Nemrut Limited | Hospitality | 2026 |
| Nendocus Ltd | Health & social care | 2023 |
| Nene Import Export Ltd | Wholesale & retail | 2023 |
| Nene Real Estate Ltd | Real estate | 2022 |
| Neni Infra Ltd | Construction | 2019 |
| Neni Services Limited | Information & communication | 2017 |
| NEO Optic Limited | Information & communication | 2003 |
| Neom Enterprises Ltd | Wholesale & retail | 2025 |
| Neon Dodgeball CIC | Arts & recreation | 2025 |
| Neon Hero Limited | Arts & recreation | 2012 |
| Neosoftware Limited | Information & communication | 2015 |
| Neph Buchan Ltd | Administrative & support | 2023 |
| Nephila Digital Ltd | Administrative & support | 2012 |
| Nereus Controls Ltd | Professional & scientific | 2025 |
| Nergiz Fresh Ltd | Hospitality | 2025 |
| Nergiz Restaurant Ltd | Hospitality | 2019 |
| Nergiz Restaurant NR3 Ltd | Hospitality | 2026 |
| Nerman Kitchens Limited | Hospitality | 2023 |
| Nervous Graphics Limited | Professional & scientific | 2003 |
| NES Healthcare Limited | Education | 2018 |
| NES Holdings (UK) Limited | Health & social care | 1997 |
| Ness Point Consulting Limited | Professional & scientific | 2026 |
| Nessie Healthcare Limited | Health & social care | 2020 |
| Nesspoint Ltd | Extraterritorial | 2024 |
| Nest Autos Car Repairs Ltd | Wholesale & retail | 2024 |
| Nest Community Art CIC | Arts & recreation | 2020 |
| Nestled Nook Norfolk Ltd | Wholesale & retail | 2025 |
| Nestor Advisors Limited | Professional & scientific | 2002 |
| NET Trading Ventures Limited | Hospitality | 2014 |
| Net-Haus Sports Group Ltd | Education | 2025 |
| Netar Limited | Financial services | 2026 |
| Netcase Ltd | Information & communication | 2001 |
| Nethergate Developments Limited | Construction | 2020 |
| Netspeak Games Development Ltd | Information & communication | 2020 |
| Netspeak Games Ltd | Information & communication | 2019 |
| Netsys Limited | Information & communication | 2016 |
| Netunes Limited | Information & communication | 2025 |