| NFS Essex Ltd | Hospitality | 2022 |
| Ngiabs UK Services Ltd | Transport & logistics | 2022 |
| NGS Group Limited | Construction | 2021 |
| NGS Projects Limited | Administrative & support | 2021 |
| NGS Property Maintenance Ltd. | Administrative & support | 2018 |
| NH London Limited | Construction | 2018 |
| Nibs and Bibs Ltd | Wholesale & retail | 2024 |
| Niche Estate Services Ltd | Other services | 2025 |
| Nicholas Michael Property Ltd | Real estate | 2026 |
| Nicholls Projects Ltd | Energy | 2023 |
| Nicholls Property Holdings Ltd | Real estate | 2025 |
| Nick Brennan Photography Limited | Professional & scientific | 2017 |
| Nick Jones Psychotherapy Ltd | Health & social care | 2022 |
| NICO3 Enterprises Limited | Professional & scientific | 2015 |
| Nigel Hilliard Ltd. | Manufacturing | 2013 |
| Nigesta Limited | Construction | 2000 |
| Nightingales Medical Billing Limited | Financial services | 2012 |
| Nightpearl Limited | Real estate | 2003 |
| Nikstick Estate Ltd | Real estate | 2025 |
| Nila Innovation Ltd | Health & social care | 2012 |
| Nims Care UK Limited | Health & social care | 2022 |
| Nina's Natural Kitchen Limited | Manufacturing | 2021 |
| Nine Ashes Land Developments Ltd | Construction | 2024 |
| Nine Eleven Ltd | Wholesale & retail | 2026 |
| Nineform Nutrition Ltd | Manufacturing | 2026 |
| Ninja.Ing Ltd | Information & communication | 2024 |
| NIP Solutions Limited | Construction | 2022 |
| Nissemma Limited | Professional & scientific | 2018 |
| Nitech Consultancy Ltd | Information & communication | 2018 |
| Nitron Developments Limited | Information & communication | 2019 |
| Nitzaedge Ltd | Professional & scientific | 2024 |
| NIXIEBLEU10 Ltd | Professional & scientific | 2025 |
| NJ Hill Consultancy Limited | Professional & scientific | 2022 |
| Njhealth Limited | Health & social care | 2018 |
| Njoy Innovations Ltd | Wholesale & retail | 2012 |
| NJW Medical Solutions Ltd | Health & social care | 2025 |
| NK Health Solutions Ltd | Health & social care | 2024 |
| NM Governance Consultancy Limited | Information & communication | 2017 |
| NM Medics Limited | Health & social care | 2018 |
| Nmcg Limited | Other services | 2023 |
| NO Fret Records Limited | Arts & recreation | 2024 |
| NO Place Like Home Interiors Ltd | Wholesale & retail | 2022 |
| No-X Europe Ltd | Water & waste | 1999 |
| NO.8 Boutique UK Limited | Wholesale & retail | 2021 |
| NO1 Beauty Box Ltd | Other services | 2018 |
| NOA Property Management Ltd | Real estate | 2022 |
| Noble 5 Limited | Wholesale & retail | 2020 |
| Noble Group Consultants Limited | Professional & scientific | 2018 |
| Noble Property Consultants Ltd | Real estate | 2020 |
| Noella Grace Pharma Ltd | Health & social care | 2024 |
| Noella Grace Properties Ltd | Real estate | 2025 |
| Nommu Ltd | Manufacturing | 2019 |
| Nonfungible Ltd | Information & communication | 2021 |
| Nonlanee Limited | Other services | 2009 |
| Noonan Labs Ltd | Professional & scientific | 2026 |
| Noordy Ltd | Financial services | 2025 |
| Nord Financial Services Ltd | Financial services | 2022 |
| Nordfields Investments Limited | Real estate | 2013 |
| Nordic Knight Ltd | Administrative & support | 2025 |
| Norma Chemicals (U K) Ltd | Manufacturing | 2017 |
| Norma Chemicals Limited | Manufacturing | 1947 |
| Norma Healthcare Ltd | Extraterritorial | 2012 |
| Normand Lodge Limited | Households | 2020 |
| Norostoreuk Ltd | Wholesale & retail | 2026 |
| North Essex Commercial Services Limited | Professional & scientific | 2026 |
| North London Trading Company Limited | Financial services | 2009 |
| North Romford Properties Limited | Construction | 2024 |
| Northern Synergy Limited | Wholesale & retail | 2015 |
| Northumberland Court Residents (Cliftonville) Limited | Other services | 1961 |
| Norton Heath Limited | Construction | 2016 |
| NOT Worth Two BOB Ltd | Extraterritorial | 2008 |
| Notjusteverything.Com Ltd | Wholesale & retail | 2025 |
| Notorious Abundance Ltd | Information & communication | 2023 |
| Nova Clinic (Shenfield) Limited | Wholesale & retail | 2025 |
| Nova Square Property Ltd | Real estate | 2025 |
| Nova Thermal Ltd | Construction | 2024 |
| Novaco Limited | Information & communication | 1990 |
| Novaco Navigation Limited | Administrative & support | 2012 |
| Novana Advisory Ltd | Professional & scientific | 2015 |
| NPB Solutions Ltd | Professional & scientific | 2018 |
| NRG Landscapes Limited | Administrative & support | 2018 |
| NS Energy Services Limited | Construction | 2025 |
| NS Risdon (High Class Butchers) Ltd | Wholesale & retail | 2011 |
| NSR Commercial LLP | | 2022 |
| NTD Restaurants Limited | Hospitality | 2015 |
| Ntech Consultants Limited | Administrative & support | 2007 |
| Ntech Contracts Limited | Administrative & support | 2006 |
| NU Rose Limited | Wholesale & retail | 2015 |
| Nuben Digital Ltd | Information & communication | 2026 |
| Nuclear Races Ltd | Arts & recreation | 2013 |
| Nucleus Healthcare Solutions Ltd | Extraterritorial | 2023 |
| Nuevo Legal Solutions Limited | Information & communication | 2019 |
| Number Gamez Limited | Information & communication | 2012 |
| Number One Creative Ltd | Wholesale & retail | 2022 |
| Number TEN Lavenham Limited | Hospitality | 2012 |
| Numbergain Limited | Construction | 2002 |
| Numi Scan (Brentwood) Ltd | Administrative & support | 2023 |
| Nummus Capital Partners Ltd | Professional & scientific | 2026 |
| Nurtured C.I.C. | Administrative & support | 2024 |
| Nusuru Limited | Health & social care | 2018 |