| Nicola PYE Coaching Ltd | Professional & scientific | 2023 |
| Nicoletta Catering Limited | Hospitality | 2016 |
| Nieuw Limited | Professional & scientific | 2015 |
| Nigel Scrace Limited | Wholesale & retail | 2009 |
| Nigel Wilkes Ltd | Professional & scientific | 2019 |
| Nightjar Studios Ltd | Information & communication | 2026 |
| Niko Niko Consulting Ltd | Information & communication | 2025 |
| Nine Carlton Limited | Real estate | 2022 |
| Nine Montacute Road Management Company Limited | Professional & scientific | 1988 |
| Nine Solutions Limited | Professional & scientific | 2011 |
| Ninescope Ltd | Information & communication | 2026 |
| Nineteen Sixty Three Limited | Financial services | 2017 |
| Ninja Fairy Limited | Financial services | 2020 |
| Niprose Investments Limited | Professional & scientific | 2017 |
| Nisomed Limited | Health & social care | 2022 |
| Nisroc Limited | Information & communication | 1992 |
| Niteco Europe Ltd | Information & communication | 2018 |
| NJ Creative Club Ltd | Information & communication | 2025 |
| NK & BA Services Limited | Administrative & support | 2024 |
| NK Rose Limited | Administrative & support | 2023 |
| NLA Digital Ltd | Information & communication | 2024 |
| NLA Media Access Limited | Professional & scientific | 1994 |
| NLM Consultancy Ltd | Transport & logistics | 2020 |
| NMD Properties Limited | Real estate | 2022 |
| NO More Dull Ltd | Professional & scientific | 2024 |
| NO6 Beauty Rooms Limited | Health & social care | 2013 |
| NO6 Clinic Limited | Health & social care | 2006 |
| Nobles Wood Residents Management Company Limited | Households | 2013 |
| Noction Ltd | Information & communication | 2014 |
| Nogg Drinks Ltd | Manufacturing | 2025 |
| Nolan Barber Ltd | Other services | 2026 |
| Nordicsense Ltd | Wholesale & retail | 2024 |
| Norfolk Grange (Tunbridge Wells) Management Company Limited | Households | 2003 |
| Norman Bromley Partnership LLP | | 2003 |
| Normanton Park Homes Ltd | Real estate | 2004 |
| Normflow Property Management Limited | Households | 1985 |
| Norsepine Limited | Real estate | 1981 |
| North East South West Limited | Information & communication | 2003 |
| North From NOW Ltd | Professional & scientific | 2025 |
| North of the Wood Limited | Other services | 2019 |
| North South Collide Ltd | Information & communication | 2025 |
| North Star Safety Group Limited | Professional & scientific | 2022 |
| Northease Consulting Ltd | Administrative & support | 2008 |
| Northfleet Developments Limited | Real estate | 2004 |
| Northfleet Holdings Limited | Financial services | 2020 |
| Northlea Consulting Private Limited | Professional & scientific | 2012 |
| Northstar Surveying Limited | Professional & scientific | 2005 |
| Northwick Consultants Limited | Financial services | 2025 |
| Nortrax Management Limited | Real estate | 2004 |
| Notorum Publishing Limited | Information & communication | 2022 |
| Nourish Community Foodbank Limited | Health & social care | 2012 |
| Nourriture Events Limited | Hospitality | 2021 |
| Nous Leadership Limited | Administrative & support | 2020 |
| Nova Event Consultancy Limited | Hospitality | 2026 |
| Nova Events & PR Limited | Professional & scientific | 2011 |
| Nova TW Ltd | Hospitality | 2023 |
| NOW Next WHY Limited | Professional & scientific | 2021 |
| NOW Then Research Limited | Professional & scientific | 2018 |
| Nplush Studio Limited | Professional & scientific | 2025 |
| NPM Services Limited | Administrative & support | 2023 |
| NRC Plumbing & Heating Ltd | Construction | 2013 |
| Nrswa Enterprises Ltd | Administrative & support | 2011 |
| NSA Imports Limited | Wholesale & retail | 2015 |
| NT Autotraders Limited | Wholesale & retail | 2022 |
| NT HUQ Limited | Information & communication | 2019 |
| Ntwrk Global Ltd. | Information & communication | 2022 |
| Number 10 Designs Limited | Professional & scientific | 2012 |
| Number 16 Dudley Road RTM Company Ltd | Households | 2017 |
| Number 8 Boyne Park Limited | Households | 1995 |
| Number One Community Trust (TW) Ltd. | Administrative & support | 2001 |
| Number One Residential Limited | Professional & scientific | 2011 |
| Numeris Accounting Ltd | Professional & scientific | 2025 |
| Numinix IT Limited | Information & communication | 2025 |
| Nunn Ltd | Information & communication | 2011 |
| Nuon AI Ltd | Information & communication | 2020 |
| Nursery Mews Management Company (Pembury) Limited | Households | 2022 |
| Nurture Community Outreach Services CIC | Education | 2021 |
| Nutmeg CS Limited | Professional & scientific | 2016 |
| Nutri Export | | 1996 |
| NUTS4CLIMBING Limited | Arts & recreation | 2011 |
| NW Interior Design Ltd | Other services | 2013 |
| NXS GRP Limited | Administrative & support | 2024 |
| Nyra.Global Ltd | Arts & recreation | 2025 |
| Nyro Technologies Ltd | Information & communication | 2024 |
| NYT Aura Limited | Hospitality | 2021 |
| NZM Ltd | Real estate | 2021 |
| O B (Admin) Limited | Professional & scientific | 2022 |
| O Plant-Based Ltd | Wholesale & retail | 2024 |
| O&O Homan Limited | Financial services | 2025 |
| O.T Bar Hire and Services Ltd | Hospitality | 2026 |
| Oa-Residential Limited | Professional & scientific | 2010 |
| Oak Lodge (Tunbridge Wells) Management Limited | Households | 1993 |
| Oak Park Place Management Company Limited | Households | 2025 |
| Oak Road Limited | Professional & scientific | 1989 |
| Oak Tree Homes Management Company Limited | Real estate | 2018 |
| Oakdale Media Limited | Information & communication | 2011 |
| Oaken Consulting Limited | Professional & scientific | 2022 |
| Oakfield Electrical Services Ltd | Construction | 2019 |
| Oaklands Mechanical Ltd | Construction | 2020 |
| Oakley Peat Limited | Manufacturing | 2018 |