| N V a Services Limited | Construction | 1986 |
| N&M Financial Services Ltd | Professional & scientific | 1999 |
| N&N(Uk) Ltd | Manufacturing | 2026 |
| N.Cox Consulting Limited | Professional & scientific | 2025 |
| N.S.H. Medical Limited | Health & social care | 2011 |
| N2 Consulting Limited | Information & communication | 2022 |
| Nabha Consultancy Limited | Information & communication | 2025 |
| Nadeem Ashraf Consultancy Limited | Professional & scientific | 2024 |
| Nael Merchandising Ltd | Wholesale & retail | 2025 |
| Naeldawnmerchandising Ltd | Wholesale & retail | 2026 |
| Naidu & Co UK Ltd | Transport & logistics | 2018 |
| Naigaga Properties Ltd | Real estate | 2022 |
| Nailss & Beautyy Ltd | Other services | 2025 |
| Nakatari Limited | Manufacturing | 2025 |
| Naked Energy Limited | Administrative & support | 2009 |
| Naksak Ltd | Wholesale & retail | 2026 |
| NAM Cleaners Ltd | Administrative & support | 2024 |
| Namaste Corp Limited | Financial services | 2024 |
| Namub Limited | Health & social care | 2025 |
| NANA2006 Ltd Limited | Health & social care | 2023 |
| Napier Martin Coachworks Ltd | Wholesale & retail | 2018 |
| Nara Luxury Shopper Ltd | Administrative & support | 2026 |
| Narbada Properties Limited | Real estate | 2024 |
| Naruveli Limited | Wholesale & retail | 2016 |
| Nasbiz Ltd | Transport & logistics | 2020 |
| Nasko Renovation Ltd | Construction | 2016 |
| Natasha Carter Design Limited | Professional & scientific | 2017 |
| Nathan Wyatt Plumbing and Heating Ltd | Construction | 2017 |
| Nathlean Academy C.I.C. | Education | 2026 |
| Nation Homes Limited | Real estate | 2024 |
| National Care Link Ltd | Administrative & support | 2016 |
| National Chemical Corporation Ltd | Wholesale & retail | 2025 |
| National Parking Control Group Limited | Other services | 2021 |
| Nationwide Cleaners (Franchising) Limited | Other services | 2008 |
| Nationwide Cleaners Limited | Other services | 2008 |
| Nationwide Energy Services Ltd | Professional & scientific | 2024 |
| Natter Mgmt Ltd | Arts & recreation | 2019 |
| Nature at Work Limited | Administrative & support | 2007 |
| Nature Direct Ltd | Wholesale & retail | 2025 |
| Nature Explore Ltd | Wholesale & retail | 2023 |
| Nature Nurture Sussex CIC | Education | 2018 |
| Nature Plus Waterproofing Ltd | Construction | 2019 |
| Nature Studio Ltd | Agriculture & fishing | 2021 |
| Naturoganik Limited | Manufacturing | 2018 |
| Naudllano Ltd | Administrative & support | 2021 |
| NAVIG8 Holidays UK Ltd | Administrative & support | 2024 |
| Nayee Homes Ltd | Real estate | 2026 |
| Nayee Ltd | Wholesale & retail | 2019 |
| Nayeeh Ltd | Health & social care | 2024 |
| NAZ Concepts Ltd | Wholesale & retail | 2024 |
| NAZ Leather Industries Ltd | Manufacturing | 2020 |
| Nbusby Leisure Limited | Administrative & support | 2025 |
| NCT Window Cleaning Services Limited | Administrative & support | 2019 |
| Ndjk Railway Management Ltd | Professional & scientific | 2020 |
| Ndlovu Logistics Limited | Professional & scientific | 2022 |
| NDM Swim School LLP | | 2013 |
| NDS22 Ltd | Information & communication | 2019 |
| Neba Freight Limited | Transport & logistics | 1991 |
| Neba Shipping Line Limited | Transport & logistics | 1991 |
| Nedy Logistics Ltd | Transport & logistics | 2016 |
| Nedycraft Ltd | Wholesale & retail | 2024 |
| Nelepcu Care Limited | Health & social care | 2017 |
| Nelp Skin Limited | Wholesale & retail | 2025 |
| Nemco Utilities Ltd | Construction | 1999 |
| Neoteric Media Ltd | Professional & scientific | 2026 |
| NEP UK and Ireland Group Limited | Financial services | 2016 |
| NEP UK Film I Limited | Financial services | 2016 |
| NEP Visions Limited | Extraterritorial | 1992 |
| Nepfest Limited | Wholesale & retail | 2025 |
| Nerra Ltd | Professional & scientific | 2025 |
| Nest Heavens Limited | Real estate | 2023 |
| Nesture Mortgages Ltd | Financial services | 2025 |
| Netqube Solutions Limited | Information & communication | 2025 |
| Netreality Limited | Real estate | 2025 |
| Nett Holdings Limited | Financial services | 2022 |
| Network Airline Services Ltd | Transport & logistics | 2007 |
| Network Aviation Group Ltd | Professional & scientific | 2012 |
| Network Radiology Reporting Limited | Health & social care | 2020 |
| Neuro Diagnostic Solutions Limited | Health & social care | 2015 |
| Neurogenedx Ltd | Professional & scientific | 2025 |
| Neuroscience School of Advanced Studies | Education | 2018 |
| Neutalent Search Ltd | Administrative & support | 2024 |
| Never Ending Hope and Blessing International | Health & social care | 2026 |
| New AGE Confectionery Limited | Manufacturing | 2021 |
| New AGE Medical Limited | Health & social care | 2020 |
| New Dragon 2501 Ltd | Hospitality | 2025 |
| New Global Consortium Limited | Professional & scientific | 2023 |
| New Golden City Ltd | Hospitality | 2025 |
| New Horizons Support Services Ltd | Health & social care | 2023 |
| New Move Estate Agency Ltd | Real estate | 2010 |
| New Move Residential Ltd | Real estate | 2025 |
| New Nucletron UK Limited | Manufacturing | 2007 |
| New Season Glow Ltd | Information & communication | 2020 |
| New Urbanedge Mart Ltd | Wholesale & retail | 2025 |
| New Xing Feng Health Club Limited | Other services | 2025 |
| Newlake Management Company Limited | Households | 2017 |
| Newline Building Materials Ltd | Wholesale & retail | 2024 |
| Newline Plastics Limited | Wholesale & retail | 2014 |
| Newman's Plants Limited | Administrative & support | 2004 |
| Newson Partners Limited | Real estate | 2012 |