| Nilon Ltd | Wholesale & retail | 2022 |
| Nimfas Corporation Ltd | Wholesale & retail | 2021 |
| NIN Limited | Transport & logistics | 2019 |
| Nita Knitting & Manufacturing Limited(The) | Other services | 1948 |
| Nita Transport Limited | Transport & logistics | 2014 |
| Nixi Electrical Ltd | Construction | 2025 |
| Nixon Farrow Limited | Administrative & support | 2001 |
| NJ GAS and Mechanical Services Limited | Construction | 2019 |
| NJ Plumbing & Electrical Ltd | Construction | 2022 |
| Njpd Ltd | Construction | 2024 |
| NK Garage Ltd | Wholesale & retail | 2022 |
| NK Neri Couriers Ltd | Transport & logistics | 2022 |
| NK Painting Ltd | Construction | 2024 |
| NKC Engineering Services Limited | Construction | 2012 |
| NKN Courier Ltd | Transport & logistics | 2019 |
| Nlftm Ltd | Arts & recreation | 2024 |
| NMC Paving Ltd | Construction | 2026 |
| NMP Holdings Ltd | Financial services | 2017 |
| NO 14 Byron Road Residents Association Limited | Households | 2001 |
| Noah Pinder Ltd | Information & communication | 2023 |
| Noah's ARK Pet Clinic Ltd | Professional & scientific | 2025 |
| Noah's Bar Ltd | Hospitality | 2025 |
| Noah’S ARK Care Solutions Ltd | Administrative & support | 2025 |
| Noble Wealth Management Limited | Financial services | 2016 |
| Nobleurban Ltd | Real estate | 2025 |
| Nocturnal Media Limited | Information & communication | 2003 |
| Nocturnal Pictures Ltd | Information & communication | 2017 |
| Noel Gordon Associates Limited | Professional & scientific | 2012 |
| Nofi Ventures Limited | Professional & scientific | 2022 |
| Noircat Ltd | Financial services | 2011 |
| Noisy Media Group Ltd | Information & communication | 2025 |
| Nojerm Limited | Manufacturing | 2015 |
| Noka Property Investment Ltd | Real estate | 2025 |
| Nolibu Ltd | Wholesale & retail | 2024 |
| Nolo Ltd | Wholesale & retail | 2021 |
| NOM NOM Asian Kitchen Limited | Hospitality | 2026 |
| Nomadix Ltd | Hospitality | 2020 |
| Nomis Studio Ltd | Other services | 2013 |
| Nontom Ltd | Wholesale & retail | 2022 |
| Noor Barber (Maidstone) Limited | Other services | 2024 |
| Noora Foods Ltd | Hospitality | 2023 |
| Nora Sushi Ltd | Hospitality | 2026 |
| Norfolk Lansdowne Limited | Real estate | 2025 |
| Norfolk Luxury Lifestyle Ltd | Wholesale & retail | 2022 |
| Norham Investment Trust Limited | Real estate | 1938 |
| Norman Creative Services Ltd | Professional & scientific | 2019 |
| Norris Fleet Services Ltd | Wholesale & retail | 2025 |
| Norseman Powerhouse Ltd | Construction | 2019 |
| North Construction Services Ltd | Construction | 2021 |
| North Holdco Limited | Financial services | 2024 |
| North Loose Limited | Agriculture & fishing | 2013 |
| North Pole Energy Ltd | Construction | 2006 |
| North Pole Storage Limited | Administrative & support | 2024 |
| North Weald Flying Services Limited | Transport & logistics | 1985 |
| Northco Limited | Real estate | 2004 |
| Northfleet Estates Limited | Real estate | 2015 |
| Northgate Garage Group Limited | Professional & scientific | 2003 |
| Norton Electrical Services Limited | Construction | 2004 |
| NOT Remotely Limited | Professional & scientific | 2012 |
| NOT Staying in Limited | Wholesale & retail | 2024 |
| Nova Code Studios Ltd | Information & communication | 2024 |
| Nova Dispatch Ltd | Transport & logistics | 2026 |
| Nova Kent Logistics Ltd | Transport & logistics | 2025 |
| Novadiagnostics Limited | Health & social care | 2013 |
| Novatech Prime Group Ltd | Wholesale & retail | 2024 |
| Novo Transformation Limited | Information & communication | 2012 |
| Novus Aurora Ltd | Real estate | 2024 |
| Novus Homes Ltd | Construction | 2017 |
| NOW Construction Group Limited | Financial services | 2021 |
| NOW Construction Limited | Construction | 2021 |
| NOW Residential Limited | Construction | 2026 |
| NPC Electrical South East Limited | Construction | 2015 |
| NQQ Technologies Ltd | Information & communication | 2024 |
| Nrc-Uk Ltd | Construction | 2020 |
| NRG Electrical Contractors Ltd | Construction | 2020 |
| Nrgbase Limited | Wholesale & retail | 2012 |
| NRS Network Installations Ltd | Construction | 2024 |
| NRX Limited | Administrative & support | 2024 |
| NS Flooring Ltd | Wholesale & retail | 2016 |
| NS Tradings (UK) Ltd | Wholesale & retail | 2012 |
| NS2 Academy Ltd | Education | 2023 |
| NS2 Smiles Ltd | Health & social care | 2023 |
| NSB Homes Ltd | Extraterritorial | 1984 |
| NSB Properties Ltd. | Extraterritorial | 2007 |
| NSC Electrical Contractors LLP | | 2018 |
| NSP Cases Ltd | Manufacturing | 2010 |
| Nstefanov 1906 Ltd | Transport & logistics | 2021 |
| NT Healthcare Limited | Health & social care | 2007 |
| NTB Detailing Ltd | Administrative & support | 2021 |
| NTH Degree Associates Limited | Wholesale & retail | 2024 |
| NTO Group Limited | Construction | 2017 |
| Ntps Consulting Ltd | Construction | 2013 |
| Nuaman Property Holdings Ltd | Real estate | 2018 |
| Nubetech Ltd | Information & communication | 2019 |
| Nucat Machinery Ltd | Manufacturing | 2019 |
| Nude Music Limited | Arts & recreation | 2010 |
| Nude Records Limited | Arts & recreation | 2002 |
| Nugus Limited | Wholesale & retail | 2023 |
| Numchock Developments Limited | Financial services | 2021 |
| Nume Aesthetic Clinic Limited | Other services | 2021 |