| NN265 Ltd | Hospitality | 2025 |
| NO Water Just Shine Limited | Administrative & support | 2023 |
| NO.31 Wellness Limited | Arts & recreation | 2024 |
| NO.471 Ltd | Other services | 2017 |
| NO.471INTERIORS Ltd | Other services | 2021 |
| NO4 Media Ltd | Hospitality | 2025 |
| Nobilis Legacy Ltd | Real estate | 2025 |
| Noble D Estates LLP | | 2021 |
| Noble D Limited | Real estate | 2018 |
| Noble Diadem Properties Ltd | Hospitality | 2023 |
| Noble Glazing Ltd | Construction | 2020 |
| Nocdrylining Limited | Construction | 2024 |
| Nodumaga Limited | Wholesale & retail | 2020 |
| Noel Joseph Limited | Professional & scientific | 2026 |
| NOK1 Limited | Professional & scientific | 1987 |
| Nomadic Engineering Services Limited | Professional & scientific | 2021 |
| Noni Homes Properties Ltd | Real estate | 2024 |
| Noomari Limited | Real estate | 2020 |
| Nooroils Ltd | Other services | 2025 |
| Nor-Cal UK Limited | Wholesale & retail | 1998 |
| Nordic Forest (UK) Limited | Wholesale & retail | 2001 |
| Nordic Forest Products Limited | Wholesale & retail | 2011 |
| Noremead Enterprises Limited | Real estate | 2018 |
| Norfolk Boreas Limited | Construction | 1999 |
| Norfolk House Dental Care Limited | Health & social care | 2011 |
| Norfolk Offshore Wind Property Management Limited | Construction | 2025 |
| Norfolk Vanguard East Limited | Construction | 2020 |
| Norfolk Vanguard West Limited | Construction | 2012 |
| Noros Services Ltd | Construction | 2024 |
| North Bristol Plastering Ltd. | Construction | 1995 |
| North Falls Offshore Wind Farm Holdco Limited | Financial services | 2020 |
| North Falls Offshore Wind Farm Limited | Construction | 2020 |
| North London Gym 1 Ltd | Arts & recreation | 2024 |
| North Meadow Performance Horses Limited | Arts & recreation | 2017 |
| North of Midnight Ltd | Information & communication | 2016 |
| North Star 2019 Ltd | Hospitality | 2019 |
| North Star Labs Limited | Information & communication | 2020 |
| North Star Nursery Limited | Education | 1992 |
| North Swindon Development Company Limited | Construction | 1998 |
| North Swindon Social Club Ltd | Hospitality | 2025 |
| North Wilts Gardening Services Ltd | Professional & scientific | 2023 |
| North Wilts Group Ltd. | Administrative & support | 2014 |
| North Wilts Model Engineering Limited | Arts & recreation | 2014 |
| Northampton Speedway Limited | Arts & recreation | 2026 |
| Northcot Construction Limited | Construction | 2011 |
| Northernsoulagency Ltd | Administrative & support | 2023 |
| Northside Valeting Centre Ltd | Administrative & support | 2025 |
| Northwind Research International Ltd | Professional & scientific | 2024 |
| Northwood Services Limited | Professional & scientific | 2018 |
| Norvical Ltd | Extraterritorial | 2013 |
| Norwich East Electric Forecourt Ltd | Energy | 2019 |
| Nosybe Property Investments Limited | Real estate | 2024 |
| NOT Dead YET LLP | | 2023 |
| Nouveauriche London Ltd | Other services | 2017 |
| Nouver Limited | Information & communication | 2013 |
| Nova Cleaning Facilities Ltd | Administrative & support | 2026 |
| Nova Consulting Limited | Information & communication | 1996 |
| Nova Health Solutions & Services Ltd | Wholesale & retail | 2025 |
| Nova Reach Care Ltd | Health & social care | 2025 |
| Novacki Transport Ltd | Transport & logistics | 2025 |
| Novaq Ltd | Information & communication | 2025 |
| Novari Holdings Ltd | Financial services | 2025 |
| Novaro Ltd | Professional & scientific | 2017 |
| Novastone Limited | Administrative & support | 2025 |
| Novo Homes Ltd | Real estate | 2026 |
| Novo Repairs Ltd | Wholesale & retail | 2023 |
| Noytags Ltd | Manufacturing | 2025 |
| Nozzle.Ai Limited | Information & communication | 2014 |
| NP Goods Limited | Wholesale & retail | 2022 |
| Npalphramand Engineering Ltd | Professional & scientific | 2025 |
| NPK Productions Ltd | Professional & scientific | 2018 |
| NR Developments (Wiltshire) Ltd | Construction | 2019 |
| NRL Recruitment Services Ltd | Real estate | 2017 |
| Nrnk Company Ltd | Professional & scientific | 2023 |
| NSB Electrical Contractors Limited | Construction | 2013 |
| NSD Courier & Rental Solutions Ltd | Transport & logistics | 2025 |
| NSD Ltd | Administrative & support | 2014 |
| NSG Cars Ltd | Transport & logistics | 2025 |
| Nsst Ltd | Professional & scientific | 2015 |
| NT335 Ltd | Hospitality | 2025 |
| NU U (UK) Ltd | Other services | 2011 |
| Nubac Dining Ltd | Hospitality | 2025 |
| Nugensoft Limited | Information & communication | 2013 |
| Nugnugz Ltd | Wholesale & retail | 2026 |
| Nuli Property Ltd | Real estate | 2023 |
| Number 1 TV and Media Limited | Information & communication | 2006 |
| Number 12 Holdings Limited | Financial services | 2019 |
| Nuratyem Investments Limited | Real estate | 2020 |
| Nurse of Wiltshire Care (NOW Care) Ltd | Administrative & support | 2025 |
| Nursery of Narnia Limited | Health & social care | 2026 |
| Nurses Connect UK Ltd | Health & social care | 2024 |
| Nurture Sales and Marketing Ltd | Professional & scientific | 2014 |
| Nutmeg Design Limited | Manufacturing | 2026 |
| Nuudhair Limited | Other services | 2025 |
| Nuvem Logic Ltd | Information & communication | 2017 |
| Nuvitera Property Ltd | Real estate | 2023 |
| Nuvo Classic Limited | Manufacturing | 2003 |
| Nuyubar Limited | Manufacturing | 2017 |
| NV Design UK Ltd | Professional & scientific | 2004 |
| NVE Holdco Limited | Financial services | 2020 |