| Nisha Express Limited | Wholesale & retail | 2009 |
| Nisha Properties Ltd | Real estate | 2019 |
| Nixon Flowmeters Limited | Manufacturing | 1974 |
| Nixoweb Ltd | Information & communication | 2025 |
| NJH Decorating Ltd | Construction | 2021 |
| NJM Inc Limited | Real estate | 2021 |
| NJM Professional Ltd | Health & social care | 2026 |
| NJP Valeting and Detailing Limited | Wholesale & retail | 2025 |
| NKC Power Ltd | Professional & scientific | 2024 |
| Nm-Trading-Solutions Ltd | Construction | 2019 |
| NN Technologies Ltd | Information & communication | 2022 |
| NNS Couriers Limited | Transport & logistics | 2025 |
| NO 20 Clarence Square Limited | Households | 1981 |
| NO Problem Hosting Ltd | Information & communication | 2023 |
| NO Regrets Holdings Limited | Professional & scientific | 2024 |
| NO Regrets Studio Limited | Real estate | 2021 |
| NO Regrets Studio Rentals Limited | Other services | 2019 |
| NO Regrets Training Limited | Other services | 2025 |
| No-Till Farming Ltd | Extraterritorial | 2014 |
| NO. 10 Barber Shop Limited | Other services | 2010 |
| NO. 2 Pittville Lawn Management Company Limited | Real estate | 1987 |
| NO. 91 Developments Ltd | Construction | 2021 |
| NO.5 Tanning Lounge Limited | Other services | 2022 |
| NO11 Nails Ltd | Other services | 2026 |
| NO8 Brickwork Limited | Construction | 2024 |
| NO8 Group Ltd | Financial services | 2019 |
| NO8 Investment Limited | Extraterritorial | 2020 |
| NO8 Scaffolding Limited | Construction | 2017 |
| Noah Properties (Gloucester) Limited | Construction | 2017 |
| Nobl Marketing & Sales Ltd | Professional & scientific | 2017 |
| Noble Elements Systems Engineering Limited | Information & communication | 2018 |
| Node Audio Ltd | Information & communication | 2020 |
| Noel Marshall Holiday Home Estates (2004) Limited | Real estate | 2004 |
| NOIR96 Studio Ltd | Professional & scientific | 2021 |
| Noire INK London Ltd | Other services | 2021 |
| Noiselevel Limited | Information & communication | 2005 |
| Nolan Business Consulting Limited | Professional & scientific | 2022 |
| Nolani Care Limited | Health & social care | 2023 |
| NOM NOM Reusables Ltd | Wholesale & retail | 2022 |
| Nomad Letterpress Ltd | Information & communication | 2023 |
| Nomadic Creatives Limited | Arts & recreation | 2017 |
| Nomads Tax Limited | Professional & scientific | 2023 |
| Nook & Key Properties Ltd | Real estate | 2024 |
| Nooka Ltd | Administrative & support | 2023 |
| NOP SEC Consulting Ltd | Information & communication | 2018 |
| Nopsr Limited | Administrative & support | 2016 |
| Nord Acoustics Limited | Manufacturing | 2016 |
| Nordic Inns Limited | Hospitality | 2004 |
| Nordwind Developments Limited | Real estate | 2016 |
| Noriker FPA Ltd | Energy | 2023 |
| Noriker FPB Ltd | Energy | 2023 |
| Noriker FPC Ltd | Energy | 2023 |
| Noriker FPD Ltd | Energy | 2023 |
| Noriker Operations Ltd | Energy | 2025 |
| Noriker Power Ireland Ltd | Energy | 2021 |
| Noriker Power Ltd | Energy | 2015 |
| Noriker Systems Ltd | Information & communication | 2017 |
| Norlow Limited | Professional & scientific | 2011 |
| Normandy House Construction Limited | Administrative & support | 2012 |
| Normandy House Properties Limited | Financial services | 2010 |
| Norsu Media Group Limited | Information & communication | 2020 |
| North Cotswold Services Ltd | Agriculture & fishing | 2017 |
| North Gloucestershire Railway Company Limited | Transport & logistics | 1985 |
| North Hall Apartments RTM Company Ltd | Other services | 2011 |
| North Oxford Property Services Limited | Real estate | 2002 |
| North Place (Cheltenham) Limited | Households | 2012 |
| North Tower Consulting Limited | Professional & scientific | 2019 |
| North West London Residential Limited | Real estate | 2024 |
| Northfield Springs Limited | Information & communication | 2026 |
| Northlands Management Company (Cheltenham) Limited | Households | 2003 |
| Northleach Club Limited | Hospitality | 2009 |
| Northorn Limited | Extraterritorial | 2007 |
| Northscene Ltd. | Professional & scientific | 1988 |
| Northstar Pathways Ltd | Education | 2025 |
| Northwick House Management Company Limited | Households | 1988 |
| Northwood Cheltenham Ltd | Real estate | 2002 |
| Norton Health Ltd | Health & social care | 2023 |
| Norwich DC Limited | Information & communication | 2025 |
| Norwich NG Limited | Energy | 2023 |
| Norwood Consulting Ltd | Professional & scientific | 2012 |
| Norwood House Limited | Households | 1990 |
| Nosehill Farm Limited | Agriculture & fishing | 2016 |
| Nosta Ltd | Administrative & support | 2025 |
| Nosteck Limited | Professional & scientific | 2023 |
| NOT Just Branding Ltd | Professional & scientific | 2022 |
| NOT Your Average Entertainment Ltd | Arts & recreation | 2020 |
| Notaperioddrama Ltd | Arts & recreation | 2025 |
| Notevole Ceylon Gems Ltd | Manufacturing | 2026 |
| Noto Voce Ltd | Information & communication | 2024 |
| Nottingham Home Extensions Limited | Construction | 2015 |
| Nounou Ltd | Wholesale & retail | 2021 |
| Nourish Kitchen Cotswolds Limited | Hospitality | 2026 |
| Nourish With Rosa Ltd | Education | 2025 |
| Nova Black Solutions Limited | Information & communication | 2025 |
| Nova Blue Technologies Limited | Information & communication | 2020 |
| Nova Electrical Services Limited | Construction | 2021 |
| Nova Finitor Ltd. | Information & communication | 2021 |
| Nova Wedding Photography Limited | Professional & scientific | 2024 |
| Novacloud Ltd | Information & communication | 2010 |
| Novacloud Workspace Ltd | Information & communication | 2025 |