| Normec Latis Scientific Limited | Professional & scientific | 1983 |
| North Kent Armoury Ltd | Wholesale & retail | 2025 |
| North Kent Mind | Health & social care | 2004 |
| North Kent Property Services Ltd. | Administrative & support | 2021 |
| North Kent Scaffolding Ltd | Construction | 2022 |
| North Sea Habitats Ltd | Real estate | 2018 |
| Northcrown Property Ltd | Real estate | 2026 |
| Northern Wind Ltd | Transport & logistics | 2025 |
| Northernship Freight Management Limited | Wholesale & retail | 2022 |
| Northkentpropertyacquisition Ltd | Real estate | 2016 |
| Northlands Commercial Limited | Administrative & support | 1961 |
| Northoak Capital Ltd | Real estate | 2021 |
| Northoak Developments Ltd | Construction | 2020 |
| Northoak Group Ltd | Real estate | 2020 |
| Northoak Investments Ltd | Real estate | 2020 |
| Northoak London Ltd | Professional & scientific | 2020 |
| Northoak Trade Ltd | Administrative & support | 2020 |
| NOT Just ANY Media Ltd | Professional & scientific | 2025 |
| NOT Only Thursday Ltd | Hospitality | 2022 |
| Nothingness Ltd | Arts & recreation | 2021 |
| Nouveau Clinic Limited | Other services | 2015 |
| Nova Group Investment Ltd | Real estate | 2018 |
| Novakap Ltd | Professional & scientific | 2020 |
| Novapeakstore Ltd | Wholesale & retail | 2025 |
| Novasera Properties Limited | Real estate | 2023 |
| Novawest Global Limited | Construction | 2025 |
| Novella Developments Ltd | Real estate | 2025 |
| Novo Business Services Ltd | Transport & logistics | 2013 |
| Novo Couriers Limited | Real estate | 2009 |
| Novr Properties Ltd | Real estate | 2019 |
| Novum Mortgage Services Limited | Financial services | 2021 |
| NP Bar & Grill Ltd | Hospitality | 2022 |
| Np&S Services Ltd | Administrative & support | 2019 |
| NPH Construction Ltd | Construction | 2025 |
| NPN Prestige Ltd | Hospitality | 2025 |
| NRG Broker Recruitment Ltd | Administrative & support | 2025 |
| NRG Non-Destructive Testing Ltd | Professional & scientific | 2023 |
| Nrlb Limited | Financial services | 2019 |
| Nsanchez Limited | Financial services | 2022 |
| NSC Events Limited | Arts & recreation | 2025 |
| NSC Financial Services Limited | Financial services | 2015 |
| NSN Group Ltd | Transport & logistics | 2017 |
| NSR Ventures Limited | Real estate | 2017 |
| NSV Enterprise Ltd | Hospitality | 2021 |
| NTC Cars Limited | Wholesale & retail | 1989 |
| NTMA19 Company Ltd | Real estate | 2024 |
| NUF Holdings Ltd | Wholesale & retail | 2022 |
| Numa Synergy Limited | Real estate | 2022 |
| Numbrz Limited | Professional & scientific | 2019 |
| Numeric Accountancy Services Limited | Professional & scientific | 2019 |
| Nuran Ltd | Hospitality | 2017 |
| Nusu 8 Limited | Construction | 2012 |
| Nuthatch Place Management Company Limited | Households | 2017 |
| Nutty African Snacks Ltd | Hospitality | 2022 |
| Nuvique Ltd | Health & social care | 2025 |
| Nuxley Enterprises Ltd | Other services | 2014 |
| Nuyuskinclinic Ltd | Other services | 2025 |
| NVQ Assessment Centre Ltd | Education | 2022 |
| Nwac Property Investments Ltd | Real estate | 2021 |
| NXT Infotech Limited | Information & communication | 2020 |
| Nxtroot Limited | Wholesale & retail | 2025 |
| Nydes Management Company Limited | Information & communication | 2007 |
| O & a Auto Paint Suppliers Limited | Wholesale & retail | 2023 |
| O & N Barbers Ltd | Other services | 2021 |
| O O Corporation Limited | Wholesale & retail | 2022 |
| O&D.G HGV Ltd | Transport & logistics | 2017 |
| O'Connor Electrical Engineering UK Ltd | Construction | 2018 |
| O'Cube Investment Limited | Real estate | 2024 |
| O'Rourke Civil & Structural Engineering Limited | Construction | 1977 |
| O'Rourke Civil Engineering Limited | Construction | 1993 |
| O'Rourke Investments Holdings (UK) Limited | Professional & scientific | 2004 |
| O'Rourke Investments Limited | Construction | 1993 |
| O.C. Summers Limited | Construction | 1970 |
| OAI Property Company Limited | Real estate | 2024 |
| Oak & Palm Properties Ltd | Real estate | 2025 |
| Oak Collective Ltd | Other services | 2025 |
| Oak House Hawley RTM Company Limited | Households | 2022 |
| Oak Racing Kennels Limited | Arts & recreation | 2006 |
| Oakbridge Consulting Solutions Ltd | Professional & scientific | 2025 |
| Oakes Park (Dartford) Management Company Limited | Real estate | 2016 |
| Oakington Avenue Developments Ltd | Construction | 2018 |
| Oakley Auto Traders Ltd | Wholesale & retail | 2014 |
| Oakmere PM Ltd | Real estate | 2026 |
| Oakmont Mortgages Ltd | Financial services | 2021 |
| Oakstone House Limited | Real estate | 2026 |
| Oakview Estate Management Ltd | Real estate | 2022 |
| Oakwood Estates UK Limited | Real estate | 2008 |
| Oalli Ltd | Wholesale & retail | 2020 |
| OAS Dartford Limited | Real estate | 2024 |
| Oasis Haven Limited | Real estate | 2019 |
| Oasisbyns Ltd | Wholesale & retail | 2025 |
| Obaro Solutions Limited | Wholesale & retail | 2020 |
| Obas Meat Ltd | Hospitality | 2020 |
| OBE Environmental Limited | Water & waste | 2022 |
| OBI Consultants Limited | Administrative & support | 2010 |
| OBL Engineering Limited | Professional & scientific | 2018 |
| OBN Investments Ltd | Real estate | 2013 |
| Obodex UK Ltd | Health & social care | 2020 |
| Obrown UK Limited | Health & social care | 2018 |
| Ocbm Group Limited | Administrative & support | 2019 |