| Nexer Solutions Ltd | Wholesale & retail | 2026 |
| Nextgen Frame & Design Ltd | Construction | 2025 |
| Nexus Pharmacy & Health Clinics Limited | Extraterritorial | 2025 |
| Nexus Sports Limited | Wholesale & retail | 2020 |
| NG Autos Tipton Ltd | Wholesale & retail | 2026 |
| Ngadeus Limited | Health & social care | 2023 |
| Ngeneration Holdings Limited | Professional & scientific | 2008 |
| Ngeneration Limited | Information & communication | 2001 |
| NGL01 Limited | Financial services | 2024 |
| NHB Healthcare Limited | Health & social care | 2006 |
| Nice Card Co Ltd | Wholesale & retail | 2026 |
| Nicholaseagletrans Ltd | Transport & logistics | 2024 |
| Nicholls Cranes Limited | Professional & scientific | 2024 |
| Nicolaou Properties Ltd | Real estate | 2024 |
| Nicostar Healthcare Limited | Health & social care | 2016 |
| Nigel Allam Consultancy Limited | Agriculture & fishing | 2014 |
| Nightair Productions Ltd | Arts & recreation | 2012 |
| Nikal Steels Holding Co. Limited | Financial services | 2024 |
| Nikal Steels Limited | Manufacturing | 2000 |
| Nikal Steels Online Limited | Wholesale & retail | 2020 |
| Nikk Trading Ltd | Wholesale & retail | 2023 |
| Nimb Holdings Limited | Financial services | 2023 |
| Nimb Investments Limited | Financial services | 2022 |
| Nimbus Storage Limited | Manufacturing | 2024 |
| Nisana Ltd | Public administration | 2022 |
| Nissos Ltd | Wholesale & retail | 2019 |
| Nizami Logistics Services Ltd | Transport & logistics | 2026 |
| NJ Utilities Ltd | Construction | 2026 |
| NKC Properties Development Ltd | Real estate | 2025 |
| Nkemakolam Ltd | Health & social care | 2021 |
| NM Tennis Limited | Arts & recreation | 2024 |
| NME Enterprises Ltd | Real estate | 2026 |
| NN Properties Midlands Ltd | Real estate | 2023 |
| NO. 6 Inverness Gardens Limited | Households | 1991 |
| Noble Deeds for Sustainability CIC | Professional & scientific | 2025 |
| Noble-Core Contractors Ltd | Construction | 2026 |
| Noblemason Consultancy Services Ltd | Administrative & support | 2025 |
| Nofia Limited | Financial services | 2022 |
| Nomalser Ltd | Wholesale & retail | 2018 |
| Nooru Ltd | Wholesale & retail | 2022 |
| Noris Enterprises Ltd | Transport & logistics | 2010 |
| Norkana Ltd | Administrative & support | 2018 |
| Normanton House Limited | Extraterritorial | 2007 |
| Noroc Ltd | Construction | 2026 |
| North Voice and Data Limited | Information & communication | 2000 |
| NORTH13 Properties Limited | Real estate | 2021 |
| Northbank Properties Limited | Real estate | 2020 |
| Northway Auto Services Limited | Wholesale & retail | 2016 |
| Northway Developments Ltd | Construction | 2015 |
| Northway News Agent & Stores Ltd | Wholesale & retail | 2020 |
| Northway Services Limited | Transport & logistics | 2023 |
| Northwest Holdings Ltd | Real estate | 2019 |
| Northwood Aluminium Castings Ltd | Manufacturing | 2023 |
| Northwood Castings Limited | Wholesale & retail | 2014 |
| Northwood Healthcare Limited | Wholesale & retail | 2025 |
| Nory Ecom Ltd | Wholesale & retail | 2025 |
| Nova Construction Products Limited | Wholesale & retail | 2017 |
| Nova Konstrukt Ltd | Construction | 2026 |
| Nozrul's Bar & Restaurant Ltd | Hospitality | 2018 |
| NRB Hari News Ltd | Wholesale & retail | 2023 |
| NRB Studios Ltd | Information & communication | 2026 |
| NS Bhangu Transport Ltd | Transport & logistics | 2026 |
| NS Builders & Plumbing Services Limited | Construction | 2021 |
| NS Kourier Ltd | Wholesale & retail | 2023 |
| NS Travel Limited | Transport & logistics | 2026 |
| NSC Breakers Ltd | Wholesale & retail | 2021 |
| NSC Property UK Ltd | Real estate | 2024 |
| NSP Fitness Limited | Arts & recreation | 2025 |
| Nthamo Limited | Health & social care | 2012 |
| NTL Group Ltd | Wholesale & retail | 2024 |
| NTM Props Limited | Wholesale & retail | 2021 |
| NUDGE2BUDGE Limited | Information & communication | 2013 |
| Number 45 Management Limited | Real estate | 2021 |
| Numbersnet Limited | Professional & scientific | 2017 |
| Numiscan Dudley Limited | Health & social care | 2024 |
| Nurturing Mindsets CIC | Education | 2026 |
| Nutcracker Design & Marketing Limited | Professional & scientific | 2009 |
| Nutraaxis UK Limited | Manufacturing | 2016 |
| Nutrix Aesthetics (Shropshire) Ltd | Other services | 2025 |
| NV Transport Ltd | Transport & logistics | 2025 |
| NVM Admiral Ltd | Transport & logistics | 2017 |
| NW Flooring Ltd | Construction | 2026 |
| NW Process Services Ltd | Construction | 2014 |
| Nwan Properties Ltd | Real estate | 2025 |
| Nwan Sports Group Ltd | Other services | 2022 |
| Nwansport Socagemz Academy Ltd | Arts & recreation | 2025 |
| Nwansports TREATMENT4U Ltd | Arts & recreation | 2025 |
| NX Medical Ltd | Public administration | 2022 |
| Nxora Systems Ltd | Information & communication | 2025 |
| Nyro Cleaning Ltd | Administrative & support | 2025 |
| NZ Capital UK Ltd | Financial services | 2014 |
| O'Nell Services Limited | Administrative & support | 2020 |
| O.S. Comms Limited | Information & communication | 2008 |
| Oak Business Solutions Ltd | Professional & scientific | 2025 |
| Oak Farm (Taverham) Limited | Health & social care | 2015 |
| Oak Farm Bungalow Limited | Health & social care | 2017 |
| Oak Farm Court Limited | Health & social care | 2013 |
| Oak Hill Farm Ltd | Agriculture & fishing | 2023 |
| Oakham Capital Investments Limited | Financial services | 2026 |
| Oakham Consultancy Limited | Professional & scientific | 2024 |