| Mystic River Ltd | Education | 2021 |
| Mystillwater Ltd | Information & communication | 2026 |
| N & R Estates Limited | Real estate | 2018 |
| N & R Gupta Limited | Wholesale & retail | 1998 |
| N J’S Halo Glow Ltd | Other services | 2024 |
| N Sheekey Limited | Financial services | 2010 |
| N&A Social LAB Ltd | Professional & scientific | 2026 |
| N&J Construction Ltd | Construction | 2025 |
| N&S Optima Limited | Information & communication | 2025 |
| N-E Access Ltd | Construction | 2021 |
| N-Tech Engineering Limited | Professional & scientific | 2013 |
| N.E Bars Stockton Limited | Hospitality | 2023 |
| N.G Salvage Ltd | Wholesale & retail | 2018 |
| N.T. Sweeting Roofing Contractors Ltd | Construction | 2002 |
| N2586A Ltd | Other services | 2025 |
| N8S Solutions Limited | Professional & scientific | 2025 |
| Nabeel's Barber Ltd | Other services | 2025 |
| Nahima Kousar Ltd | Administrative & support | 2022 |
| Naio Nails (Distribution) Ltd | Transport & logistics | 2015 |
| NAK Holdings Limited | Financial services | 2018 |
| Nakey Bakey Limited | Wholesale & retail | 2019 |
| Namegrip Limited | Professional & scientific | 1994 |
| Namosky Properties Ltd | Real estate | 2025 |
| Nano Liquid Solutions UK Limited | Wholesale & retail | 2016 |
| Nasah Associates Limited | Transport & logistics | 2020 |
| Nascente Investments Limited | Financial services | 2025 |
| Nash Control Systems Limited | Professional & scientific | 2012 |
| Natalie Louise Ltd | Other services | 2020 |
| Natex Construction Ltd | Construction | 2026 |
| Nathan Bonner Limited | Construction | 2016 |
| Nathan Griffiths Ltd | Professional & scientific | 2018 |
| Nathan Venturesuk Ltd | Financial services | 2025 |
| National Elite Sports Coaching Ltd | Arts & recreation | 2020 |
| National Home Care Services Ltd | Health & social care | 2024 |
| Nature Time Childcare Limited | Education | 2023 |
| Natures Energies Ltd | Construction | 2023 |
| Nazcloud Limited | Information & communication | 2024 |
| NB Management Ltd | Hospitality | 2022 |
| NBA Pharm Ltd | Health & social care | 2025 |
| NBD Brickworks Limited | Construction | 2012 |
| NBD Contracts Limited | Construction | 2012 |
| NBD Joinery Limited | Construction | 2012 |
| NBD Maintenance Ltd | Construction | 2013 |
| NBR Engineering Services Limited | Manufacturing | 2013 |
| NC Corporations Limited | Wholesale & retail | 2021 |
| Ncage Limited | Professional & scientific | 2025 |
| NCB UK Delivery Ltd | Transport & logistics | 2022 |
| Ncis Ltd | Real estate | 2011 |
| Ncis Marine Supply Ltd | Real estate | 2021 |
| Ncis Recruitment Limited | Administrative & support | 2019 |
| Ncjl Limited | Real estate | 2020 |
| NDK Logistics Limited | Other services | 2017 |
| NDT Inspection Services Ltd | Professional & scientific | 2018 |
| NE Business Support Limited | Professional & scientific | 2026 |
| NE Pro Services UK Ltd | Wholesale & retail | 2015 |
| Neat Meat Burger Co Ltd | Hospitality | 2019 |
| Nebc Site Services Ltd. | Manufacturing | 2023 |
| Nedis (UK) Limited | Wholesale & retail | 1972 |
| Need Professionals Ltd | Administrative & support | 2025 |
| Neil Mcnally Ltd | Construction | 2023 |
| Nela Safety 2 Ltd | Wholesale & retail | 2023 |
| Nela TA North East Logistics Academy Limited | Education | 2024 |
| Nelochuma Limited | Health & social care | 2025 |
| Neoplus Homes Limited | Real estate | 2024 |
| Neoplus Limited | Transport & logistics | 2024 |
| Nesmo Truck Bodies Limited | Wholesale & retail | 2011 |
| Nesting Place Limited | Real estate | 2019 |
| Netlogic Ltd | Information & communication | 2025 |
| Netp Ltd | Hospitality | 2025 |
| Neurosales Ltd | Wholesale & retail | 2025 |
| Neutrion Solutions Ltd | Professional & scientific | 2025 |
| Neuvona Limited | Health & social care | 2017 |
| Never AGE Ltd | Other services | 2025 |
| Never Lost Ltd | Information & communication | 2024 |
| Nevitt Limited | Wholesale & retail | 2025 |
| Nevrargenics Limited | Professional & scientific | 2019 |
| New CT38 Limited | Hospitality | 2024 |
| New Heat Development Limited | Professional & scientific | 1999 |
| New Horizons 24/7 PVT Ltd | Health & social care | 2014 |
| New Living Group Ltd | Real estate | 2023 |
| New Process Engineering Limited | Professional & scientific | 2022 |
| New Walk Property Management C.I.C. | Real estate | 2009 |
| New World Financial Group Ltd | Financial services | 2019 |
| New York Smash Ltd | Hospitality | 2026 |
| NEW2GPLAND Limited | Education | 2023 |
| Newcrestuk Ltd | Information & communication | 2020 |
| Newfuturevest Limited | Financial services | 2012 |
| Newgate B Auckland Limited | Hospitality | 2019 |
| Newgate Construction Management Limited | Professional & scientific | 2024 |
| Newstone Medicals Limited | Health & social care | 2025 |
| Newton Installations Ltd | Construction | 2015 |
| Newtown Roots CIC | Hospitality | 2025 |
| Nexgenics Global Limited | Wholesale & retail | 2025 |
| Nexintell Limited | Information & communication | 2026 |
| Nexium NE Ltd | Health & social care | 2018 |
| Nexphase Consultancy Ltd | Other services | 2025 |
| Next Carz MOT and Service Centre Ltd | Wholesale & retail | 2025 |
| Next Level Security (Training) Ltd | Education | 2026 |
| Next Level Security Group Ltd | Administrative & support | 2024 |
| Nexus BET Ltd | Information & communication | 2017 |