| Northcliffe Accountancy Services Limited | Professional & scientific | 2004 |
| Northcliffe House (Tenby) Limited | Extraterritorial | 2015 |
| Northcote Records Management Consulting Limited | Information & communication | 2020 |
| Northcote Street Limited | Real estate | 2021 |
| Northdip Ltd | Wholesale & retail | 2024 |
| Northdown Home Solutions Limited | Construction | 2021 |
| Northdown Investments Limited | Administrative & support | 2021 |
| Northeast Windows and Doors, Conservatories Ltd | Construction | 2019 |
| Northern Arch Property Group Ltd | Real estate | 2024 |
| Northern Bar Scene Ltd | Other services | 2020 |
| Northern Enterprise Action | Other services | 2011 |
| Northern Hospitality ( Lancashire) Limited | Hospitality | 2021 |
| Northern Office Services Ltd | Administrative & support | 2021 |
| Northern Republic Ltd | Hospitality | 2016 |
| Northern Social Investment Group Limited | Financial services | 2006 |
| Northern Swegway Ltd | Administrative & support | 2017 |
| Northern Taxis Limited | Transport & logistics | 2016 |
| Northgate Auction Rooms Limited | Wholesale & retail | 2001 |
| Northgate Project Solutions Ltd | Administrative & support | 2019 |
| Northmonster Ltd | Information & communication | 2024 |
| Northover & Williamson Limited | Real estate | 2012 |
| Northpine Management Services Ltd | Real estate | 2023 |
| Northrelay Ltd | Wholesale & retail | 2025 |
| Northridge Associates Limited | Professional & scientific | 2019 |
| Northrose Limited | Health & social care | 2006 |
| Northstead Trading Ltd | Wholesale & retail | 2025 |
| Northstone International LLP | | 2025 |
| Northstreet(Pl) Ltd | Hospitality | 2018 |
| Northwest Car Park Co Ltd | Real estate | 2016 |
| Northwest Investigations Limited | Administrative & support | 2000 |
| Northwood Capital Investments Ltd | Real estate | 2026 |
| Northwood Cardiff Limited | Real estate | 2002 |
| Norton Advisory Ltd | Professional & scientific | 2025 |
| Norton Bailey Limited | Construction | 2015 |
| Norton Fisheries (West Midlands) Limited | Hospitality | 2018 |
| Norton Group Limited | Financial services | 2025 |
| Norton Online Ltd | Real estate | 2011 |
| Nortonscott Limited | Manufacturing | 2025 |
| Norven Limited | Administrative & support | 2025 |
| Norway Bergen International Co., Ltd | Mining & quarrying | 2026 |
| Norway Bidco Limited | Financial services | 2025 |
| Norway Karo Crop Science Co., Ltd | Mining & quarrying | 2024 |
| Norway Midco 1 Limited | Financial services | 2025 |
| Norway Midco 2 Limited | Financial services | 2025 |
| Norway Pushiman Phosphating Group Ltd | Agriculture & fishing | 2025 |
| Norway Tenmeira Industrial Co., Ltd | Mining & quarrying | 2023 |
| Norway Topco Limited | Financial services | 2025 |
| Norway Wilmussen Agricultural Chemical Co., Ltd | Manufacturing | 2023 |
| Norway Yala Plant Nutrition Co., Ltd | Mining & quarrying | 2026 |
| Norwegian Church Cardiff Bay Trading Ltd | Hospitality | 2022 |
| Norwegian Romdt Chemical Stock Co., Ltd | Mining & quarrying | 2026 |
| Norwich Budget Cars Ltd | Wholesale & retail | 2019 |
| Norwich Construction Limited | Construction | 2013 |
| NOS 55 - 65 Halliard Court Limited | Real estate | 2016 |
| NOS DA Cardiff Ltd | Financial services | 2022 |
| Nosh NOW Ltd | Administrative & support | 2019 |
| Nosmay Enterprise Solutions Ltd | Information & communication | 2019 |
| Nosorog Construction Ltd | Construction | 2022 |
| NOT Always Visible CIC | Other services | 2026 |
| NOT in USE GP Qonnectd Ltd | Administrative & support | 2021 |
| NOT Just a Handyman Ltd | Construction | 2024 |
| NOT Just Another Ltd | Professional & scientific | 2020 |
| Notacompany Ltd | Wholesale & retail | 2025 |
| Notamvis Limited | Administrative & support | 2014 |
| Notes of Northumberland Ltd | Manufacturing | 2018 |
| Nothenorm Limited | Wholesale & retail | 2025 |
| Nothing Else on TV Ltd | Information & communication | 2019 |
| Notistech Ltd | Information & communication | 2025 |
| Notrevu Ltd | Professional & scientific | 2025 |
| Nott Development Studios PAC | | 2015 |
| Notting Hill Apparel Ltd | Wholesale & retail | 2026 |
| Nottingham Vocational College Ltd | Education | 2023 |
| Notton Art Limited | Wholesale & retail | 2023 |
| Nottx Ltd | Public administration | 2015 |
| Notus Energy Limited | Professional & scientific | 2022 |
| Noumz Operational Security Ltd | Administrative & support | 2026 |
| Noure Ltd | Wholesale & retail | 2025 |
| Nourish (Cardiff) Ltd | Hospitality | 2022 |
| Nourish Smart Ltd | Hospitality | 2020 |
| Nourland Limited | Wholesale & retail | 2024 |
| Nous Voila Events Ltd | Manufacturing | 2018 |
| Nouveau Lettings Ltd | Real estate | 2023 |
| Nouveau Sourcing Ltd | Real estate | 2021 |
| Nouvelle Creative Limited | Professional & scientific | 2025 |
| Nouvelle Path Limited | Information & communication | 2025 |
| Nouvem Solutions Ltd | Wholesale & retail | 2021 |
| Nova (Jersey) Knit PLC | | 1966 |
| Nova Cart Trade Ltd | Wholesale & retail | 2025 |
| Nova Creative Limited | Arts & recreation | 2024 |
| Nova Cura Global Limited | Health & social care | 2026 |
| Nova Design Studio Limited | Professional & scientific | 2016 |
| Nova Digital Group Ltd | Information & communication | 2025 |
| Nova Electrical Ltd | Construction | 2020 |
| Nova Elevation Ltd | Wholesale & retail | 2025 |
| Nova ET Vetera Limited | Construction | 2021 |
| Nova Family Office Ltd | Professional & scientific | 2025 |
| Nova Flooring Ltd | Wholesale & retail | 2015 |
| Nova Force Trading Ltd | Wholesale & retail | 2025 |
| Nova Future Flow Ltd | Wholesale & retail | 2026 |
| Nova Impact Ltd | Information & communication | 2024 |