| NJS Gold Ltd | Wholesale & retail | 2017 |
| NJT Solutions Limited | Professional & scientific | 2004 |
| NMA Consulting Solutions Ltd | Information & communication | 2011 |
| NMP Innovation Ltd | Information & communication | 2020 |
| NMR Solutions Ltd | Health & social care | 2026 |
| Nneval Ltd | Health & social care | 2026 |
| NO 10 Hair (Ludlow) Limited | Other services | 2023 |
| NO Dice Games Ltd | Manufacturing | 2021 |
| NO Filter Aesthetics Studio Ltd | Other services | 2024 |
| NO Other Life Ltd | Information & communication | 2026 |
| NO. Thirty Seven Ltd | Real estate | 2025 |
| NO.1 Blinds Ltd | Wholesale & retail | 2015 |
| NO.1 Brownes Way Coffee Shop Ltd | Hospitality | 2023 |
| NO.1 Nails Limited | Other services | 2019 |
| NO.1 Nails Project Limited | Extraterritorial | 2020 |
| Noble Steele Properties Limited | Real estate | 2019 |
| Nocav Ltd | Wholesale & retail | 2025 |
| Nodus Advisory Limited | Information & communication | 2026 |
| Nodus Holdings Ltd | Professional & scientific | 2006 |
| Nohman Aziz Ltd | Financial services | 2020 |
| Nolan Decorations Limited | Construction | 2007 |
| Nolan Investments Limited | Real estate | 2017 |
| NOM NOM Events Limited | Hospitality | 2024 |
| NOM NOM Operations and Creative Ltd | Hospitality | 2026 |
| Nomad Coffee and Catering Ltd | Hospitality | 2020 |
| Nomad Groundworks Limited | Construction | 2023 |
| Nood Stores Ltd | Wholesale & retail | 2024 |
| Noosh Cafe Limited | Hospitality | 2025 |
| NOR67 Limited | Households | 2022 |
| Norgate Limited | Information & communication | 2021 |
| Norland Homes Limited | Real estate | 2025 |
| Norland Investments Limited | Real estate | 1976 |
| Norman Long Printers Limited | Administrative & support | 2002 |
| Nortech Management Holding Limited | Financial services | 2015 |
| North Hill Tree Services Ltd | Administrative & support | 2025 |
| North Oak Holdings Limited | Real estate | 2007 |
| North Oak Property Rentals (UK) Ltd | Real estate | 2021 |
| North Oak Securities Limited | Financial services | 2021 |
| North Safe Ltd | Wholesale & retail | 2023 |
| North West Case Management Ltd | Health & social care | 2025 |
| Northstar Events Ltd | Extraterritorial | 2008 |
| Northstar Experience Ltd | Professional & scientific | 2026 |
| Northwick Services Limited | Health & social care | 2019 |
| Northwood (Worcester) Limited | Real estate | 2003 |
| Northwood Scion Limited | Real estate | 2021 |
| Norton Pre-School C.I.C. | Education | 2016 |
| Norwood Green Properties (West) Limited | Real estate | 2020 |
| Norwood Green Properties Ltd | Real estate | 2016 |
| NOT Going to UNI Limited | Administrative & support | 2008 |
| Nouvatan Limited | Other services | 2012 |
| Nova Internet Limited | Administrative & support | 2014 |
| Nova Padel Ltd | Arts & recreation | 2024 |
| Novac Transport Services Limited | Transport & logistics | 2023 |
| Novawave Services Ltd | Construction | 2025 |
| Novi Group (UK) Limited | Information & communication | 2014 |
| Novlolak Ltd | Manufacturing | 2010 |
| Novus 365 Ltd | Information & communication | 2023 |
| NOW Resourcing Ltd | Information & communication | 2022 |
| Nowsolutions Digitaltransformation Limited | Information & communication | 2022 |
| NR Consulting Ltd | Professional & scientific | 2022 |
| NRB Mortgages Ltd | Financial services | 2021 |
| Nrtauk Limited | Information & communication | 2025 |
| NSA Capital Ltd | Real estate | 2025 |
| NSK Motors Ltd | Wholesale & retail | 2024 |
| NSP Recruitment Limited | Administrative & support | 2012 |
| Ntmk Solutions Limited | Wholesale & retail | 2024 |
| Nu-Gnu Ltd | Professional & scientific | 2020 |
| Nu-Image Packaging (Clwyd) Limited | Manufacturing | 1990 |
| Nu:Motive Ltd | Arts & recreation | 2022 |
| Nucool Ltd | Construction | 2025 |
| Number Fifteen Legal Ltd | Administrative & support | 2024 |
| Number Fifteen Travel Ltd | Administrative & support | 2024 |
| Number I Ltd | Professional & scientific | 2019 |
| Nunnery Wood High School | Education | 2011 |
| Nunnery Wood High School Enterprises Ltd | Education | 2011 |
| Nunwell Estate Ltd | Real estate | 2021 |
| Nursery Villa Management Ltd | Households | 2024 |
| Nursery Walk Ltd | Education | 2020 |
| Nurture at Home Ltd | Education | 2022 |
| Nurture Families C.I.C. | Education | 2019 |
| Nurture Hub Therapy Service C.I.C. | Health & social care | 2021 |
| Nurture My Way Ltd | Education | 2014 |
| Nuvee House Ltd | Wholesale & retail | 2022 |
| Nuview Group Limited | Wholesale & retail | 2021 |
| Nuzzle & Nest Ltd | Wholesale & retail | 2025 |
| NV Logistic Ltd | Transport & logistics | 2023 |
| NV Skin Clinic Ltd | Health & social care | 2022 |
| NVC Inspections Ltd | Professional & scientific | 2025 |
| NW and Associates Limited | Other services | 2010 |
| NW Bathroom Products Ltd | Wholesale & retail | 2023 |
| NWE Solutions Limited | Construction | 2019 |
| Nyrys Ltd | Professional & scientific | 2021 |
| Nzholdings Limited | Real estate | 2023 |
| O & S Morrison Ltd | Professional & scientific | 2021 |
| O & S Services Limited | Hospitality | 2015 |
| O&Co Limited | Manufacturing | 2016 |
| O&S Properties Management Ltd | Real estate | 2022 |
| O'Donohoe & Company Limited | Other services | 2019 |
| O.S. Consultancy Limited | Real estate | 2015 |
| OA Surf Club Limited | Arts & recreation | 2015 |