| Niiyii Ltd | Wholesale & retail | 2021 |
| Nijay Computer Consultants Limited | Information & communication | 1997 |
| Nika Services Limited | Administrative & support | 2016 |
| Niki Investments Limited | Real estate | 2016 |
| Nikotrans Service Ltd | Transport & logistics | 2022 |
| Nile Care Services Ltd | Administrative & support | 2022 |
| Nile Food and Wine Limited | Wholesale & retail | 2026 |
| Nilkanth Construction Limited | Construction | 2009 |
| Nimalan Ltd. | Real estate | 2012 |
| Nimoni Limited | Real estate | 2017 |
| Nimz Properties Ltd | Real estate | 2021 |
| Nina Made IT Ltd | Manufacturing | 2019 |
| NINA19(UK) Ltd | Wholesale & retail | 2023 |
| Nine 360 Limited | Information & communication | 2015 |
| Nine Forty One Limited | Information & communication | 2022 |
| Nine Sun Limited | Wholesale & retail | 2025 |
| Ninetwentyfive Global Search Ltd | Administrative & support | 2023 |
| Niouwave Virtual Assist Ltd | Administrative & support | 2025 |
| Nipa's Beauty Limited | Other services | 2010 |
| Niquit and Skin Care Ltd | Wholesale & retail | 2025 |
| Nira (UK) Limited | Health & social care | 2013 |
| Niram Technology Ltd | Information & communication | 2025 |
| Niroeyal Limited | Professional & scientific | 2021 |
| Nirvana Circle Therapy Limited | Health & social care | 2026 |
| Nirvana Ventures Limited | Real estate | 2016 |
| Nirvani & Shiv Holdings Limited | Financial services | 2023 |
| Nish Clinic Limited | Health & social care | 2021 |
| Nish Group Limited | Wholesale & retail | 2026 |
| Nish Properties Limited | Real estate | 2022 |
| Nisha OFF License Limited | Administrative & support | 2003 |
| Nishat UK PVT Ltd | Wholesale & retail | 2024 |
| Nishi and Nitho Property Ltd | Real estate | 2026 |
| Nishoria Food Services Ltd | Hospitality | 2022 |
| Nitro Competitions Ltd | Arts & recreation | 2025 |
| Nitro Gymnastics and Trampolining Ltd | Arts & recreation | 2020 |
| NIV01 Limited | Administrative & support | 2025 |
| Nivado Services Limited | Construction | 2025 |
| Nivis HSE Limited | Construction | 2024 |
| NIX Bakery Ltd | Manufacturing | 2024 |
| Niyazi Properties Ltd | Real estate | 2019 |
| NIZ Limited | Real estate | 2022 |
| Nizan Ltd | Information & communication | 2015 |
| NJ Properties Alfa Ltd | Real estate | 2025 |
| NJ Properties London Ltd | Real estate | 2024 |
| Njesurveyors Limited | Professional & scientific | 2024 |
| NJK Decorators Ltd | Construction | 2020 |
| NJL Consultants Ltd | Information & communication | 2015 |
| NK1BILLI Records Ltd | Information & communication | 2023 |
| Nkadko Ltd | Financial services | 2009 |
| NKL Foods Ltd | Wholesale & retail | 2024 |
| NKP Pizza Limited | Hospitality | 2006 |
| Nkrumah Consultancy Ltd | Professional & scientific | 2014 |
| NKV Limited | Wholesale & retail | 2025 |
| NL Capital Limited | Real estate | 2016 |
| NLP Academy Limited | Administrative & support | 1999 |
| NLP Life Academy Limited | Administrative & support | 2011 |
| Nluxeuk Limited | Education | 2025 |
| NM Recovery Ltd | Transport & logistics | 2026 |
| NM Steel Limited | Administrative & support | 2014 |
| NMJ Autos Ltd | Wholesale & retail | 2026 |
| Nmma Property Ltd. | Real estate | 2018 |
| NMN Mineral Nutrition Limited | Administrative & support | 2021 |
| NMS Tech Ltd | Information & communication | 2026 |
| Nnedinath UK Ltd | Health & social care | 2024 |
| Nnid Limited | Professional & scientific | 2012 |
| Nnrsse Ltd | Administrative & support | 2024 |
| NO 7 Compton Road Residents Management Company Limited | Households | 2005 |
| NO Genre Ltd | Manufacturing | 2023 |
| NO Name Building Service Ltd | Construction | 2025 |
| NO. 4 Devonshire Buildings (Bath) Management Limited | Households | 1984 |
| NO. 46 Management Company Limited | Real estate | 1987 |
| NO. 7 Threadneedle Lane Ltd | Financial services | 2017 |
| Noble Claims Services Limited | Financial services | 2012 |
| Noble Commercial Services Ltd | Other services | 2017 |
| Noble Express Courier Services Ltd | Transport & logistics | 2017 |
| Noble Nest Private Ltd | Real estate | 2024 |
| Noblerise Holding Ltd | Real estate | 2025 |
| Nocdaccare Ltd | Health & social care | 2018 |
| Nodes & Networks Ltd | Information & communication | 2011 |
| Noegenesis Ltd | Professional & scientific | 2017 |
| Noin Properties Limited | Real estate | 2022 |
| Noisymedia Ltd | Information & communication | 2011 |
| Noka Damp Proof Limited | Construction | 2023 |
| Noki Investments Ltd | Real estate | 2025 |
| Nola Service Ltd | Real estate | 2025 |
| Nolan Limited | Administrative & support | 2004 |
| Nomad Taekwondo Limited | Education | 2018 |
| Nomadic Dinners Ltd | Hospitality | 2017 |
| Nomadshop Ltd | Wholesale & retail | 2025 |
| Nomofrau Limited | Administrative & support | 2019 |
| Noonoo UX Ltd | Professional & scientific | 2023 |
| Noor Auto Workshop Limited | Wholesale & retail | 2012 |
| Noor BBQ HUT Limited | Hospitality | 2025 |
| Noor COLLECTIONS1 Ltd | Wholesale & retail | 2025 |
| Noorayd Management Ltd | Households | 2021 |
| Noori Abacus Ltd | Professional & scientific | 2007 |
| Noova Goods Ltd | Wholesale & retail | 2025 |
| Noraa Consulting Ltd | Professional & scientific | 2020 |
| Norbury D&G Limited | Wholesale & retail | 2023 |
| Norbury DG Limited | Wholesale & retail | 2026 |