| Night Patrol Ltd | Administrative & support | 2005 |
| Night Response Security Services Ltd | Administrative & support | 2025 |
| Night Time Beds and Sofas Limited | Manufacturing | 2024 |
| Nikkah Partitions Limited | Other services | 2023 |
| Niklu Investments Limited | Real estate | 2016 |
| Niklu Limited | Professional & scientific | 2021 |
| Niko Coatings Limited | Manufacturing | 1998 |
| Niko Extrusions Limited | Administrative & support | 1981 |
| Niko Holdings Limited | Financial services | 2021 |
| Nila Properties Group Limited | Real estate | 2023 |
| Nim's Beauty Ltd | Other services | 2025 |
| Nimco Capital Limited | Real estate | 2023 |
| Nimco Prestige Limited | Wholesale & retail | 2023 |
| Nimi Events Ltd | Hospitality | 2026 |
| Nimrah ZEB Limited | Professional & scientific | 2013 |
| Nimzz Ltd | Wholesale & retail | 2026 |
| Nina Optics Ltd | Health & social care | 2022 |
| NINETEEN82 Communications Ltd | Professional & scientific | 2026 |
| NINETEEN82 Limited | Wholesale & retail | 2022 |
| Ninety Two Holdings Ltd | Real estate | 2025 |
| Nirr Accountancy Services Ltd. | Professional & scientific | 2021 |
| Nirr Property Services Ltd | Real estate | 2025 |
| Nirvana Media Ltd | Information & communication | 2025 |
| Nirvana Property Group Ltd | Professional & scientific | 2022 |
| Nisaa Online Limited | Wholesale & retail | 2022 |
| Nisacourier Limited | Transport & logistics | 2026 |
| Nisah Optical Ltd | Wholesale & retail | 2023 |
| Nishaat Ltd | Wholesale & retail | 2021 |
| Nishacare Pharm Ltd | Health & social care | 2025 |
| Nishtec Logistics Ltd | Transport & logistics | 2023 |
| Nishtec Properties Ltd | Real estate | 2020 |
| Nissa Consultants Ltd | Professional & scientific | 2023 |
| Nissa Traders Ltd | Wholesale & retail | 2024 |
| Nives Locum Services Limited | Health & social care | 2022 |
| Nixene Limited | Professional & scientific | 2018 |
| Nixene Publishing Limited | Information & communication | 2018 |
| Niyyah Logistics Ltd | Transport & logistics | 2024 |
| NJ (2022) Ltd | Real estate | 2022 |
| NJ Clothing UK Ltd | Wholesale & retail | 2026 |
| NJ Commercial Cleaning Services Ltd | Administrative & support | 2019 |
| NJ Howarth Ltd | Administrative & support | 2025 |
| NJ Mitchell Joinery Ltd | Construction | 2024 |
| NJ Mitchell Property Maintenance Ltd | Construction | 2025 |
| NJ Sweet Cakes Ltd | Hospitality | 2017 |
| NJJ Properties Ltd | Real estate | 2021 |
| NK Building Services (Yorkshire) Limited | Construction | 2023 |
| NK Capital Holdings Limited | Households | 2018 |
| NK Car Rental Limited | Administrative & support | 2025 |
| NK Designs Limited | Administrative & support | 2014 |
| NK Energy Limited | Construction | 2024 |
| NK Essential Supplies Ltd | Wholesale & retail | 2020 |
| NK Homeware Ltd | Wholesale & retail | 2023 |
| NK Partners Ltd | Transport & logistics | 2024 |
| NK Storage Bradford Ltd | Transport & logistics | 2025 |
| NK.2020 Ltd | Health & social care | 2025 |
| NKD Therapist Ltd | Health & social care | 2024 |
| Nkei Limited | Health & social care | 2014 |
| NKH Medical Ltd | Administrative & support | 2016 |
| Nkhanile Limited | Health & social care | 2018 |
| NKS Estates Ltd | Real estate | 2023 |
| NKW Leisure Ltd | Hospitality | 2023 |
| NL Labourers Limited | Construction | 2025 |
| NM Locum Services Ltd | Health & social care | 2021 |
| NM2 Limited | Wholesale & retail | 2022 |
| NMA Properties Ltd | Real estate | 2025 |
| NMA Property Services INT Ltd | Real estate | 2025 |
| NMB Commercial Properties Ltd | Real estate | 2021 |
| NMC Galaxy Limited | Professional & scientific | 2013 |
| NMC Live Ltd | Administrative & support | 2016 |
| Nmedscan Limited | Health & social care | 2019 |
| NMG Hub Ltd | Administrative & support | 2015 |
| NMN Ltd | Administrative & support | 2014 |
| NN 23 Investments Limited | Hospitality | 2021 |
| NN Aesthetics Ltd | Health & social care | 2023 |
| NN Prestige Cars Limited | Wholesale & retail | 2025 |
| NNN Assets Ltd | Real estate | 2024 |
| NNN Transport Limited | Transport & logistics | 2023 |
| Nntc Group Ltd | Education | 2024 |
| NO Danger Ltd | Real estate | 2024 |
| NO1 Masala Wirral Ltd | Hospitality | 2024 |
| Noble Freestyle Martial Arts Ltd | Arts & recreation | 2023 |
| Noble Linen Ltd | Other services | 2025 |
| Noble Threads Ltd | Wholesale & retail | 2025 |
| Noblelink Logistics Limited | Transport & logistics | 2025 |
| Nobugz Ltd | Information & communication | 2025 |
| Nobul Ltd | Wholesale & retail | 2025 |
| Nofilter Beauty & Aesthetics Limited | Other services | 2021 |
| Noga Manufacturing Ltd | Manufacturing | 2022 |
| Noir DE Voir Limited | Hospitality | 2022 |
| Noirfield Ltd | Wholesale & retail | 2025 |
| Nola Foods Ltd | Wholesale & retail | 2023 |
| Nomadic Mobile Pizza Ltd | Hospitality | 2026 |
| Nomadic Naturals Ltd | Other services | 2024 |
| Nomeda UK Limited | Wholesale & retail | 2023 |
| Nomi Tree & Garden Ltd | Administrative & support | 2026 |
| Nomiii Logistics Ltd | Transport & logistics | 2025 |
| Nomkh Ltd | Wholesale & retail | 2025 |
| Nontigo Ltd | Information & communication | 2018 |
| Nooaad Ltd | Wholesale & retail | 2025 |
| Noodle Creative Limited | Professional & scientific | 2008 |