| Nijjerco Ltd | Wholesale & retail | 2017 |
| Nikhil Food Limited | Hospitality | 2025 |
| Nikhy Investments Limited | Real estate | 1999 |
| Niki Pountney Associates Limited | Administrative & support | 2010 |
| Nikki Elphick Consulting Ltd | Professional & scientific | 2016 |
| Nikober Ltd | Other services | 2025 |
| Niktex Limited | Wholesale & retail | 2019 |
| Nikyunique Ltd | Wholesale & retail | 2026 |
| Nikz Ltd | Real estate | 2026 |
| Nilab Homes Ltd | Real estate | 2023 |
| Nile Acacia GUM Ltd | Wholesale & retail | 2022 |
| Nile Graphics Limited | Wholesale & retail | 2010 |
| Nile Properties Limited | Real estate | 2020 |
| Nilkanth Healthcare Limited | Wholesale & retail | 2025 |
| Nilkanth PVT Limited | Wholesale & retail | 2019 |
| Nilkanth Travel Ltd | Administrative & support | 2015 |
| Nillzpaa Property Management Company Limited | Real estate | 2021 |
| Nilosh Ltd | Wholesale & retail | 2025 |
| Nilz and Harley Pet Services Ltd | Other services | 2017 |
| NIM Communications Limited | Real estate | 1996 |
| Nimbus Air Limited | Transport & logistics | 2014 |
| Nimbus Cart Ltd | Wholesale & retail | 2026 |
| Nimet Ltd | Other services | 2021 |
| Nimi Holdings Ltd | Financial services | 2022 |
| Nimit Tiles Ltd | Construction | 2025 |
| Nimkii Ltd | Hospitality | 2018 |
| Nimrat Transport Ltd | Transport & logistics | 2021 |
| Nims Boutique Ltd | Wholesale & retail | 2022 |
| Nims Deals Limited | Wholesale & retail | 2025 |
| Ninad Aditi Limited | Health & social care | 2024 |
| Nine Constructing & Consulting Ltd | Construction | 2022 |
| Nine Eighty One Ltd | Financial services | 2025 |
| Nine Fashions Ltd | Manufacturing | 2016 |
| Nine Nine Seventeen Limited | Manufacturing | 2020 |
| Nine X Nine Ltd | Professional & scientific | 2017 |
| Nineteensummers Ltd | Wholesale & retail | 2025 |
| Nini's Property Developing Ltd | Construction | 2018 |
| Ninja Innovations Limited | Wholesale & retail | 2019 |
| Ninwara Ltd | Other services | 2019 |
| Niphon Limited | Real estate | 2019 |
| Nippon Cars Ltd | Wholesale & retail | 2024 |
| Nira Gimper Ventures Limited | Administrative & support | 2026 |
| Nirac Design Engineering Ltd | Professional & scientific | 2016 |
| Niraj Autos Ltd | Wholesale & retail | 2023 |
| Niram Investments Limited | Health & social care | 1993 |
| Niranjana Projects Ltd | Wholesale & retail | 2020 |
| Nircotes Transport Ltd | Transport & logistics | 2014 |
| Niro's Ltd | Hospitality | 2021 |
| Niroon Ltd | Hospitality | 2023 |
| Nirvana Events Ltd | Administrative & support | 2025 |
| NIS Signs (Leicester) Ltd. | Manufacturing | 2009 |
| Nisbett Properties Ltd | Real estate | 2024 |
| Nise Homecare Ltd | Health & social care | 2024 |
| Nish Consultancy Limited | Information & communication | 2012 |
| Nish Vehicle Sourcing Limited | Wholesale & retail | 2022 |
| Nisha Investments Ltd | Financial services | 2025 |
| Nishi Motors Ltd | Wholesale & retail | 2023 |
| Nishpunum Properties Ltd | Real estate | 2024 |
| Nisi Enterprises Limited | Professional & scientific | 2007 |
| Nisi Healthcare Limited | Health & social care | 2025 |
| Nisi Medimove Limited | Transport & logistics | 2025 |
| Nisi Social Care Limited | Health & social care | 2025 |
| Nissa Autos Ltd | Wholesale & retail | 2015 |
| Nissa Ltd | Wholesale & retail | 2023 |
| Nist Investments Ltd | Financial services | 2024 |
| Nistea Ltd | Transport & logistics | 2016 |
| Nita Healthcare Ltd | Health & social care | 2022 |
| Niten Mamtora Limited | Professional & scientific | 2018 |
| Nithin Consulting Limited | Information & communication | 2015 |
| Nitrous Coin Ltd | Other services | 2026 |
| Nitrous Competitions Midlands Ltd | Other services | 2024 |
| Nitrous Competitions Racing Ltd | Other services | 2025 |
| Nityam Ltd | Wholesale & retail | 2024 |
| Niva Pharmacy Limited | Wholesale & retail | 2004 |
| Nivacom Limited | Information & communication | 2014 |
| Nivar Investment Limited | Real estate | 2022 |
| Nivart Limited | Wholesale & retail | 2003 |
| Nivash Limited | Other services | 2008 |
| Nivashni Limited | Information & communication | 2025 |
| Nivayab Ltd | Information & communication | 2020 |
| Nivi Estates Ltd | Real estate | 2021 |
| Niviato Limited | Wholesale & retail | 2021 |
| Niviexpress Limited | Wholesale & retail | 2021 |
| Nivil Ltd | Wholesale & retail | 2026 |
| Nivish Property Ltd | Real estate | 2023 |
| NIX Health and Fitness Ltd | Arts & recreation | 2012 |
| Nixtex Ltd | Administrative & support | 2002 |
| Nixtex Services Limited | Administrative & support | 2003 |
| Niyaat Properties Ltd | Real estate | 2024 |
| Niyaat Sourcing Ltd | Real estate | 2024 |
| Niyam Ltd | Wholesale & retail | 2023 |
| Niyan Packaging Ltd | Administrative & support | 2025 |
| Niyati Ltd | Extraterritorial | 2009 |
| Niyu Transport Ltd | Transport & logistics | 2024 |
| NJ Doctors Ltd | Health & social care | 2014 |
| NJ Heath Holdings Ltd | Financial services | 2025 |
| NJ Heggs Ltd | Financial services | 2014 |
| NJ Karate Ltd | Other services | 2020 |
| NJ Legacy Investments Ltd | Real estate | 2022 |
| NJ Samani Limited | Health & social care | 2009 |