| My Construction Drawings Ltd | Professional & scientific | 2023 |
| My Garden Shed Limited | Wholesale & retail | 2025 |
| My Office Team Ltd | Information & communication | 2012 |
| Myable Care Limited | Health & social care | 2023 |
| Myactiv Limited | Professional & scientific | 2006 |
| Mylo Create Limited | Professional & scientific | 2022 |
| MZK Medical Limited | Health & social care | 2008 |
| N Ledner Carpentry & Joinery Ltd | Construction | 2017 |
| N&V Landscaping and Maintenance Solutions Ltd | Professional & scientific | 2025 |
| N05 Beauty & Aesthetics Ltd | Wholesale & retail | 2018 |
| Nadito Ltd | Information & communication | 2023 |
| Nannitec Ltd | Information & communication | 2020 |
| Naso Group Ltd | Manufacturing | 2026 |
| Nations Everywhere Ltd | Construction | 2021 |
| Naughty Buoys Clothing Ltd | Wholesale & retail | 2025 |
| Navigators Walk Management Company Limited | Real estate | 2025 |
| Navis Agere Limited | Professional & scientific | 2005 |
| Navyaa Consultancy Ltd | Professional & scientific | 2024 |
| NDR Development Tech LLP | | 2014 |
| Negin Holdings Ltd | Financial services | 2018 |
| Negin Investments Ltd | Real estate | 2007 |
| Nether Hall Park Open Space Management Company Limited | Professional & scientific | 2006 |
| Netlink AI Solutions Ltd | Wholesale & retail | 2025 |
| Network Solutions Inc Ltd | Information & communication | 2012 |
| Neuhaus Property Ltd | Real estate | 2017 |
| Neurodiverseinme Ltd | Health & social care | 2026 |
| Neuxpark Ltd | Administrative & support | 2011 |
| Neve Property Holdings Limited | Real estate | 2026 |
| New AGE Shutters Holdings Limited | Manufacturing | 2024 |
| New AGE Shutters Ltd | Wholesale & retail | 2011 |
| New Barns Oasts Limited | Households | 2009 |
| New Interior Ltd | Wholesale & retail | 2024 |
| Newington Church Lane Management Company Limited | Households | 2026 |
| Newington School Lane Management Company Limited | Households | 2025 |
| Nexeng MBM Ltd | Professional & scientific | 2024 |
| Next Level Football Coaching Ltd | Education | 2026 |
| Nexy Group Ltd | Information & communication | 2015 |
| Ngmi Investments Ltd | Financial services | 2025 |
| Ngmi Limited | Administrative & support | 2021 |
| NID Carpentry Ltd | Construction | 2019 |
| NIJ Enterprises Ltd. | Wholesale & retail | 1997 |
| Nimu Ltd | Information & communication | 2015 |
| Ninety Events Limited | Information & communication | 2026 |
| NJ Property Agent Limited | Real estate | 2024 |
| NJS Global Ltd | Wholesale & retail | 2025 |
| NJT (South East) Limited | Transport & logistics | 2018 |
| NNS Leasing Limited | Other services | 2018 |
| NO Angel Clothing Ltd | Wholesale & retail | 2020 |
| NO Fuss Mortgages Ltd | Financial services | 2022 |
| NO42WINEBAR Ltd | Hospitality | 2025 |
| Noire Aesthetics Ltd | Other services | 2026 |
| Nonsenz Ltd | Wholesale & retail | 2023 |
| North Downs Land and Forestry Limited | Real estate | 2022 |
| North Kent Planning Services Limited | Professional & scientific | 2025 |
| Northill Devon Limited | Real estate | 2014 |
| Northwick Park Developments LLP | | 2022 |
| Nota Consulting Kent Ltd | Professional & scientific | 2026 |
| NP Progressive Limited | Health & social care | 2016 |
| NR Management Ltd | Households | 2026 |
| Nurture Financial Management Limited | Financial services | 2013 |
| Nurture Nexus Ltd | Education | 2025 |
| NUX Holdings Ltd | Real estate | 2022 |
| NUX International Ltd | Wholesale & retail | 2022 |
| NUX Supplies Ltd | Construction | 2020 |
| Nwcc Residents Management Company Limited | Households | 2026 |
| Oakbank Consulting Ltd | Professional & scientific | 2025 |
| Oakhurst Financial Services Limited | Financial services | 2003 |
| Oakwood Elevators Ltd | Professional & scientific | 2023 |
| OB Commercial Consultants Limited | Other services | 2023 |
| Obviusly Ltd | Wholesale & retail | 2025 |
| OFF the Drive Ltd | Information & communication | 2022 |
| Officehaus Limited | Professional & scientific | 2018 |
| Okoca Bakery Limited | Manufacturing | 2024 |
| Old School Properties Ltd. | Administrative & support | 2020 |
| OLG Interiors Limited | Other services | 2002 |
| Omilos Group Limited | Manufacturing | 2026 |
| Omorocare Ltd | Health & social care | 2021 |
| One CC Limited | Arts & recreation | 2006 |
| One Hengrove Park Phase 1 LLP | | 2026 |
| One Lockleaze LLP | | 2020 |
| One Smile Oral Care Ltd | Health & social care | 2013 |
| Online Funeral Director Ltd | Other services | 2026 |
| Onwave UK Limited | Information & communication | 2011 |
| Opal (Earlsfield) LLP | | 2013 |
| Opal (Silvertown) LLP | | 2014 |
| Opal (ST Bernard's) LLP | | 2012 |
| Opal Land LLP | | 2011 |
| Optimax Coaching Limited | Other services | 2021 |
| Optimise (South East) Limited | Construction | 2020 |
| Optimise Waste Solutions Ltd | Water & waste | 2023 |
| Optimum (Kent) Limited | Administrative & support | 2018 |
| Optivance Consultancy Limited | Professional & scientific | 2025 |
| Oralplus Limited | Health & social care | 2024 |
| Orange OWL Coaching Limited | Professional & scientific | 2021 |
| Orbit Credit Services Ltd | Administrative & support | 2008 |
| Orbit Hill Park Management Company Limited | Households | 1976 |
| Orchard Estates Limited | Real estate | 2000 |
| Orchard Grove (East Malling) Management Company Ltd | Households | 2019 |
| Orchard Homes (Pitt Manor) Limited | Professional & scientific | 2011 |
| Orchidd Limited | Administrative & support | 2013 |