| Nuha Living Ltd | Manufacturing | 2021 |
| Null Hypothesis AI Ltd | Information & communication | 2026 |
| Nullabowry Consulting Ltd | Professional & scientific | 2025 |
| Numarketing Limited | Information & communication | 2019 |
| Numb Consulting Ltd | Professional & scientific | 2020 |
| Number 1 Golf Ltd | Manufacturing | 2017 |
| Number 786 Ltd | Real estate | 2025 |
| Number One 168 Ltd | Hospitality | 2021 |
| NUMBER12 Cars and Campers Limited | Wholesale & retail | 2021 |
| Numbers Knowhow Limited | Education | 2000 |
| Nume Health Coaching Ltd | Health & social care | 2022 |
| Numera Consultancy Ltd | Administrative & support | 2024 |
| Numii Hair Enhancement Ltd | Other services | 2026 |
| Numlok Ltd | Construction | 2023 |
| Nundra Properties Ltd | Real estate | 2025 |
| Nuneaton Garage Doors Limited | Construction | 2011 |
| Nunu General Building & Maintenance Ltd | Construction | 2021 |
| Nunwick Ltd | Transport & logistics | 2015 |
| NUP S Corporation Limited | Wholesale & retail | 2015 |
| NUP S Investment Limited | Real estate | 2022 |
| Nupur Arts Dance Academy | Arts & recreation | 2009 |
| Nuqi Agro Pharma Ltd | Wholesale & retail | 2023 |
| NUR Foods Ltd | Hospitality | 2023 |
| NUR Halal Ltd | Wholesale & retail | 2025 |
| NUR Halal Supermarket Ltd | Wholesale & retail | 2023 |
| NUR UL Habib | Education | 2024 |
| NUR Wholesale Ltd | Wholesale & retail | 2025 |
| Nuran Medical Aesthetics Ltd | Other services | 2026 |
| Nurled Ltd | Wholesale & retail | 2023 |
| Nursery Rhymes (Leicester) Limited | Education | 2009 |
| Nursery Rhymes - Knighton Limited | Education | 2023 |
| Nursery Rhymes Holdings Limited | Financial services | 2026 |
| Nursery Rhymes Learning Limited | Financial services | 2023 |
| Nursery Road Children's Home Services Ltd | Health & social care | 2026 |
| Nurturenest Children Homes Limited | Health & social care | 2025 |
| Nurturing Minds Early Years Ltd | Health & social care | 2024 |
| Nurvation Ltd | Wholesale & retail | 2026 |
| Nurwell Co. Ltd | Wholesale & retail | 2025 |
| Nushki Limited | Information & communication | 2007 |
| Nushriri Limited | Wholesale & retail | 2026 |
| Nusrat Trust | Health & social care | 2021 |
| Nutechfoods Limited | Professional & scientific | 2021 |
| Nutrafit Limited | Real estate | 2006 |
| Nutravero Limited | Wholesale & retail | 2019 |
| Nutri Supplements Limited | Wholesale & retail | 2025 |
| NUTRIENTS93 Ltd | Hospitality | 2020 |
| Nutritech Limited | Manufacturing | 2018 |
| Nutritionally Balanced Food Company Limited | Professional & scientific | 2014 |
| Nutriva Limited | Wholesale & retail | 2025 |
| Nutrivitality Limited | Manufacturing | 1998 |
| Nutryva Ltd | Wholesale & retail | 2026 |
| Nuts & Bolts Ltd | Wholesale & retail | 2012 |
| Nutti Snacks Ltd | Wholesale & retail | 2026 |
| Nutur Limited | Hospitality | 2024 |
| Nuvaas Limited | Information & communication | 2016 |
| Nuventure Ltd | Financial services | 2020 |
| Nuvexashifa Ltd | Wholesale & retail | 2025 |
| NV Aesthetics Ltd | Health & social care | 2020 |
| NV Properties Developer Ltd | Real estate | 2010 |
| NV Solution Limited | Professional & scientific | 2019 |
| NV Treatment Rooms Ltd | Administrative & support | 2025 |
| Nvgr Consultancy Ltd | Professional & scientific | 2025 |
| Nvhz Limited | Other services | 2025 |
| Nvidia Prop Limited | Real estate | 2015 |
| Nviro New Homes Limited | Construction | 2011 |
| Nvisia Ltd | Professional & scientific | 2014 |
| Nvrk Ltd | Real estate | 2026 |
| Nvsn Group Ltd | Other services | 2018 |
| Nvyas Wealth Management Limited | Financial services | 2012 |
| NWC Home Improvements Limited | Construction | 2023 |
| NWC Homes Ltd | Health & social care | 2025 |
| NX Grfx Ltd | Professional & scientific | 2023 |
| NXT Level Cleaning Services Limited | Administrative & support | 2026 |
| NY Accommodation Ltd | Real estate | 2017 |
| NY Beauti Limited | Health & social care | 2006 |
| NYA Education | Education | 2014 |
| NYA Trading Limited | Other services | 2011 |
| NYA Youth Work Foundation | Education | 2012 |
| Nyam Global Ltd | Wholesale & retail | 2025 |
| Nyameblesssly Ltd | Health & social care | 2024 |
| Nyasaland Ltd | Real estate | 2025 |
| Nyathi 72 Ltd | Health & social care | 2015 |
| Nyka Transport Ltd | Transport & logistics | 2013 |
| Nyla Trading Ltd | Wholesale & retail | 2025 |
| NYN Consultancy Ltd | Professional & scientific | 2026 |
| Nyra Bakes Limited | Manufacturing | 2026 |
| Nyra Enterprise Ltd | Wholesale & retail | 2025 |
| NYS Properties Ltd | Real estate | 2017 |
| Nytra Shield UK Ltd | Wholesale & retail | 2024 |
| Nytris Limited | Information & communication | 2025 |
| NZ Bookkeeping Ltd | Professional & scientific | 2025 |
| NZ Medical Ltd | Health & social care | 2024 |
| NZA Health Solutions Ltd | Health & social care | 2024 |
| Nzara Properties Ltd | Real estate | 2024 |
| Nzara Technicians Ltd | Wholesale & retail | 2017 |
| O & K Builders Ltd | Construction | 2024 |
| O Bohm Limited | Real estate | 2023 |
| O D Projects Limited | Construction | 2003 |
| O J C Services Limited | Administrative & support | 2006 |
| O N Plastering Limited | Construction | 2025 |