| Nikris Electrical Ltd | Construction | 2025 |
| Nilam Properties Ltd | Real estate | 2023 |
| Nile Retail Group Limited | Wholesale & retail | 2019 |
| Nimuh Services Ltd | Administrative & support | 2025 |
| NINETEEN26 Ltd | Information & communication | 2020 |
| Ninja Entertainments Limited | Professional & scientific | 2019 |
| Ninthheight Support Services Limited | Health & social care | 2026 |
| Nippon Team (Poole) Ltd | Arts & recreation | 2018 |
| Nirvana Freelance Limited | Professional & scientific | 2024 |
| Nitrochill Limited | Professional & scientific | 1965 |
| Nizoc Limited | Hospitality | 2025 |
| NJB Residential Ltd | Real estate | 2026 |
| NJC Marine Ltd | Manufacturing | 2024 |
| NJS Property & Maintenance Ltd | Construction | 2022 |
| NK Innovations Ltd | Wholesale & retail | 2025 |
| NK Training Ltd. | Information & communication | 2016 |
| Nkeji Bill Technologies Ltd | Administrative & support | 2023 |
| NLG Travel Limited | Transport & logistics | 2024 |
| Nlmet UK Limited | Wholesale & retail | 2016 |
| NLP Fusion Ltd | Education | 2021 |
| NLP Principles Limited | Extraterritorial | 2024 |
| NM Construction Specialists Ltd | Construction | 2019 |
| NM Real Estate Ltd | Real estate | 2023 |
| NMA Medical Services Limited | Health & social care | 2012 |
| NMC Property Management Limited | Real estate | 2023 |
| NMW Developments Ltd | Construction | 2025 |
| Nntb Ltd | Other services | 2019 |
| NO 1 J G a Limited | Arts & recreation | 2005 |
| NO Name Restaurant Ltd | Hospitality | 2022 |
| NO Needle Academy Ltd | Education | 2026 |
| NO Needle Skin Clinic Ltd | Education | 2022 |
| NO. 1 South African Shop Limited | Wholesale & retail | 2011 |
| NO. 6 Racing Ltd. | Professional & scientific | 2011 |
| NO. 8 Cavendish Management Limited | Households | 2005 |
| NO.1 Group South Coast Ltd | Public administration | 2023 |
| NO1 Legal & Professional International Limited | Administrative & support | 2024 |
| NO1 Legal & Professional Services Limited | Administrative & support | 2020 |
| NO1LEGAL Limited | Administrative & support | 2003 |
| Noah GIL Property Limited | Real estate | 2025 |
| Noatraum Ltd | Professional & scientific | 2023 |
| Nobab Sylhet Ltd | Hospitality | 2026 |
| Noble Citadel Ltd | Real estate | 2022 |
| Noble Table Ltd | Hospitality | 2026 |
| Nobledell Limited | Construction | 2011 |
| Noblemen Business Solutions Ltd | Information & communication | 2023 |
| Noblemen Removals Ltd | Water & waste | 2021 |
| Nocturne Global Limited | Wholesale & retail | 2025 |
| Noel Brothers (U.K.) Limited | | 1985 |
| Nola AI Ltd | Information & communication | 2024 |
| Nomadacation Limited | Professional & scientific | 2024 |
| Nomensa Ltd | Information & communication | 2001 |
| Nonneo Limited | Information & communication | 2020 |
| Nonnie Ltd | Wholesale & retail | 2025 |
| Nonny Services Limited | Construction | 2024 |
| Nonoise Audio Ltd | Information & communication | 2025 |
| Noodle Eating Bar Limited | Hospitality | 2024 |
| Norcliffe Freehold Limited | Households | 2018 |
| Nord Homes (Build) Ltd | Construction | 2019 |
| Nord Homes (Commercial Road) Ltd | Real estate | 2024 |
| Nord Homes (Developments) Ltd | Construction | 2020 |
| Nord Homes Limited | Real estate | 2014 |
| Nordwest Properties Limited | Real estate | 2023 |
| Nordwest Property LLP | | 2023 |
| Norfolk Grange Management Limited | Real estate | 2006 |
| Norfolk Hotel (Richmond Hill) Limited | Professional & scientific | 1944 |
| Norian Holdings Ltd | Financial services | 2025 |
| Noris Medical UK Ltd | Wholesale & retail | 2020 |
| Norjon Engineers Limited | Manufacturing | 2002 |
| Norman Capital Holdings Limited | Financial services | 2022 |
| Norman Motors (Holdings) Limited | Professional & scientific | 2017 |
| Norris Property Investments Ltd | Real estate | 2018 |
| North Avenue Management Company Limited | Households | 2022 |
| North Bournemouth Primary Healthcare Limited | Health & social care | 2018 |
| North Sea Trading Limited | Wholesale & retail | 2022 |
| North Star Equity Limited | Construction | 2017 |
| North World Group Ltd | Wholesale & retail | 2016 |
| North-South Properties Limited | Real estate | 1996 |
| NORTH2SOUTH Consulting Engineers Ltd | Professional & scientific | 2016 |
| Northbourne Court Management Company Limited | Households | 1986 |
| Northbourne Mews Limited | Construction | 2014 |
| Northern Property Rescue Limited | Real estate | 2026 |
| Northern Renovations Limited | Professional & scientific | 2003 |
| Northover Gardens (Bournemouth) Limited | Households | 1981 |
| Northshore Creative Ltd | Professional & scientific | 2025 |
| Northstone Property Management Ltd | Real estate | 2026 |
| Northwood Chiropractic Oxford Limited | Health & social care | 2018 |
| Northwood GB Limited | Real estate | 1998 |
| NORTO5 Ltd | Education | 2007 |
| Norton Lodge Limited | Health & social care | 2015 |
| Norton Property Portfolio Limited | Real estate | 2024 |
| Norwich Court Limited | Households | 2006 |
| Norwich Mansions RTM Co. Ltd. | Households | 2007 |
| Noshahi Kitchen Ltd | Hospitality | 2026 |
| Notano Properties Limited | Hospitality | 2023 |
| Notebook City Limited | Professional & scientific | 1997 |
| Notsallow 300 LLP | | 2013 |
| Nottington Fields Management Limited | Professional & scientific | 1997 |
| Nourish Care Systems Limited | Information & communication | 2011 |
| Nousios Limited | Other services | 2011 |
| Nova Advertising Ltd | Administrative & support | 2025 |