| Nordic Carpentry Limited | Construction | 2026 |
| Norfolk Waterside Properties Ltd | Real estate | 2024 |
| Norkay Ltd | Arts & recreation | 2025 |
| Norok Contractors Ltd | Construction | 2018 |
| Norsemanbuild Limited | Construction | 2012 |
| Norsis Ltd | Construction | 2022 |
| North Ford Solicitors Limited | Professional & scientific | 2010 |
| North Four Films Limited | Information & communication | 2018 |
| North London Homecare and Support Limited | Health & social care | 2003 |
| North Miracle Solutions Limited | Other services | 2025 |
| North Ockendon Holdings Limited | Real estate | 2025 |
| North South Rail Ltd | Construction | 2022 |
| North Star Connect Limited | Transport & logistics | 2025 |
| North Vale Advisory Limited | Professional & scientific | 2026 |
| North Woolwich Investments Ltd | Real estate | 2024 |
| Northern Bypass Ltd | Wholesale & retail | 2025 |
| Northern Star Editing Limited | Information & communication | 2013 |
| Northgate Partnership Limited | Real estate | 2020 |
| Northstar OPS Ltd | Information & communication | 2026 |
| Northstone Estates Ltd | Real estate | 2025 |
| Northvale Partners Limited | Professional & scientific | 2025 |
| Northwest Opportunities Limited | Real estate | 2025 |
| Northwestech Ltd | Information & communication | 2020 |
| Norton Davies Limited | Professional & scientific | 2020 |
| Nortonbury Ltd | Professional & scientific | 2025 |
| Norwood After-School Club Ltd | Health & social care | 2026 |
| NOT Another Art Club Limited | Other services | 2021 |
| Noted. Consultancy Ltd | Professional & scientific | 2026 |
| Noteworth Ltd | Wholesale & retail | 2024 |
| Notiongate Limited | Real estate | 1983 |
| Notorious JOE Ltd | Professional & scientific | 2023 |
| Nour Essex Limited | Administrative & support | 2024 |
| Noura Tech Limited | Information & communication | 2025 |
| Nourishment Ltd | Wholesale & retail | 2025 |
| Nova Connect(Uk) Ltd | Professional & scientific | 2015 |
| Nova Horology Ltd | Wholesale & retail | 2025 |
| Nova Insurance Limited | Financial services | 1997 |
| Nova Landmark Ltd | Real estate | 2021 |
| Nova Premium Finance Ltd | Financial services | 1998 |
| Nova Prime Recruitment Ltd | Administrative & support | 2026 |
| Nova UI Ltd | Information & communication | 2025 |
| Novacorp Digital Limited | Wholesale & retail | 2025 |
| Novalink Maritime Limited | Transport & logistics | 2024 |
| Novamart Ltd | Wholesale & retail | 2025 |
| Novaplumb Limited | Construction | 2022 |
| Novara Construction Ltd | Construction | 2026 |
| Novara Medical Ltd | Health & social care | 2025 |
| Novarise Property Group Ltd | Real estate | 2025 |
| Novark and Goode Ltd | Professional & scientific | 2019 |
| Novel Property Limited | Real estate | 2019 |
| Novia Galleria Limited | Wholesale & retail | 2020 |
| Noviora Wellness Limited | Wholesale & retail | 2026 |
| Novora Tech Ltd | Wholesale & retail | 2026 |
| Novus Labs Ltd | Information & communication | 2025 |
| Novus Real Estate Ltd | Real estate | 2025 |
| Nowtech Limited | Wholesale & retail | 2023 |
| NP Urban Ltd | Real estate | 2025 |
| NR Communications Ltd | Professional & scientific | 2012 |
| NR Services Ltd | Information & communication | 2025 |
| NRB Welfare & Education | Health & social care | 2026 |
| NRC Ventures Ltd | Administrative & support | 2026 |
| NRR Enterprises Ltd | Information & communication | 2025 |
| NRT Electrical Services Ltd | Energy | 2017 |
| NS Group of Industries Limited | Hospitality | 2021 |
| NS HR Consultancy Ltd | Administrative & support | 2017 |
| NS Realty Limited | Real estate | 2024 |
| Ns-Uk Education Consultants Ltd | Other services | 2020 |
| NSA Pharma Limited | Wholesale & retail | 2014 |
| NSB Carpentry Services Ltd | Construction | 2019 |
| NSH Flooring Limited | Construction | 2014 |
| NSK Tech Ltd | Information & communication | 2019 |
| NSL Building Services Ltd | Construction | 2013 |
| NSL Properties Limited | Real estate | 2017 |
| Nsources People Limited | Information & communication | 2011 |
| NT Accounting Services Ltd | Professional & scientific | 2016 |
| NT Management Ltd | Construction | 2025 |
| NTA Counselling Services Ltd | Other services | 2023 |
| NTA Group Holdings Limited | Information & communication | 2024 |
| Ntej Limited | Financial services | 2025 |
| NTM Property Services Ltd | Real estate | 2022 |
| NTT Trans Ltd | Transport & logistics | 2022 |
| Nuastyle Limited | Wholesale & retail | 2014 |
| Nudae Ltd | Wholesale & retail | 2025 |
| Nuestro Home Care Ltd | Health & social care | 2025 |
| Nuhu Healthcare Limited | Health & social care | 2023 |
| Nujum Sports CIC | Education | 2020 |
| Nuline Glazing Ltd | Construction | 2019 |
| Number TEN Property Ltd | Real estate | 2018 |
| Numelon Ltd. | Information & communication | 2024 |
| Numenow Ltd | Public administration | 2021 |
| Numeroo 1 Ltd | Manufacturing | 2024 |
| Nunhead Osteopaths Ltd | Health & social care | 2014 |
| Nunn & SON Printers Ltd | Manufacturing | 2011 |
| NUR Surveyors Ltd | Professional & scientific | 2023 |
| Nura Cloud Services Limited | Information & communication | 2017 |
| Nura Real Estate Limited | Real estate | 2021 |
| Nurline Group Limited | Administrative & support | 2023 |
| Nurlsing Energy Reserve Limited | Construction | 2024 |
| Nurture Healthcare Group Ltd | Administrative & support | 2024 |
| Nurtureneuro Ltd | Health & social care | 2023 |