| Newlyn Dean & Sons Limited | Agriculture & fishing | 1963 |
| Newmac Holdings Ltd | Financial services | 2022 |
| Newman Farms (Manor Farm) Limited | Professional & scientific | 2009 |
| Newnham & Jordan Solicitors Ltd | Professional & scientific | 2010 |
| Newnham Contracting Limited | Administrative & support | 2022 |
| Newnham Holdings Ltd | Professional & scientific | 2018 |
| Newsom Estate Ltd | Information & communication | 2020 |
| Newturn CNC Machining Ltd | Manufacturing | 2013 |
| Nexaurai Limited | Professional & scientific | 2025 |
| Nexpro Solutions Limited | Information & communication | 2024 |
| Next Generation Network Solutions Limited | Information & communication | 2021 |
| Next Level Change Limited | Professional & scientific | 2018 |
| Next Level Law Limited | Professional & scientific | 2025 |
| Nexu Consulting Limited | Information & communication | 2025 |
| Nexus Chiller Services Ltd | Wholesale & retail | 2021 |
| Nexus Cooling Ltd | Wholesale & retail | 2009 |
| NEXUS-74 Limited | Information & communication | 2019 |
| Ngaire Alexander Consulting Limited | Professional & scientific | 2024 |
| NGB Security Consultant Ltd | Administrative & support | 2025 |
| Nick Johnson Consultancy Limited | Information & communication | 2011 |
| Nick Latham Consulting Ltd | Professional & scientific | 2011 |
| Nick Nixon Ltd | Construction | 2004 |
| Nick Short Limited | Information & communication | 2007 |
| Nicolson Bray Ltd | Information & communication | 2012 |
| Nikita Bathia Limited | Professional & scientific | 2024 |
| Nine Projects Ltd | Professional & scientific | 2013 |
| Ninth Concept Studio Ltd | Arts & recreation | 2023 |
| Nishnash Limited | Real estate | 2023 |
| Nitor Limited | Information & communication | 2025 |
| Njlh Services Limited | Construction | 2021 |
| NJN CSV Consultancy Ltd | Professional & scientific | 2021 |
| Njord Offshore Engineering Services Limited | Professional & scientific | 2023 |
| NJT Lettings Ltd | Real estate | 2022 |
| NJW Carpentry & Joinery Limited | Manufacturing | 2022 |
| NO BAD Decisions Ltd | Wholesale & retail | 2024 |
| NO Sweat Ltd | Health & social care | 2024 |
| NO. 8 Lanark Road Freehold Limited | Households | 2009 |
| Noble JOE Inc Limited | Financial services | 2022 |
| Noble Surveying Services Limited | Professional & scientific | 2019 |
| Nodaly Ltd | Administrative & support | 2008 |
| Nodepoint Solutions Limited | Information & communication | 2022 |
| Nojistics Ltd | Information & communication | 2015 |
| Nokk Marine Ltd | Wholesale & retail | 2026 |
| Noodle Services and Solutions Ltd | Information & communication | 2014 |
| Norcast Limited | Professional & scientific | 2022 |
| Nordlands Drive Management Company Limited | Households | 2022 |
| Norlo Ltd | Manufacturing | 2020 |
| Nortech Partners Ltd | Manufacturing | 2010 |
| North Farm Horton (Contracting) Limited | Agriculture & fishing | 2016 |
| North Star Boats Limited | Manufacturing | 2026 |
| North West Bytes Ltd | Information & communication | 2023 |
| Northbourne Consulting Ltd | Information & communication | 2019 |
| Northcote Digital Limited | Information & communication | 2026 |
| Northmead (Poole) Management Company Limited | Households | 1985 |
| Northridge Construction Limited | Construction | 2001 |
| Northwest Passage Ltd | Information & communication | 2024 |
| Norward Homes Limited | Construction | 2019 |
| Norward Homes Rentals Limited | Real estate | 2025 |
| Notan Digital Ltd | Information & communication | 2022 |
| Notepad Music Limited | Information & communication | 2005 |
| Notting Hill Geoconsulting Limited | Professional & scientific | 2018 |
| Nouvio Ltd. | Professional & scientific | 2018 |
| Nova Housing Ltd | Real estate | 2018 |
| Nova Promo Limited | Administrative & support | 2023 |
| Nova Shift Limited | Professional & scientific | 2025 |
| Novatrai Ltd | Information & communication | 2025 |
| Novela Limited | Information & communication | 2023 |
| Novera Limited | Information & communication | 2023 |
| Novoa Engineering Limited | Administrative & support | 2023 |
| Nowatours Limited | Professional & scientific | 2018 |
| Noxen Tech Ltd | Information & communication | 2025 |
| Noyce Wealth Management Ltd | Professional & scientific | 2021 |
| Npsqs Ltd | Professional & scientific | 2022 |
| Nrduk Ltd | Real estate | 2020 |
| NRG Estates (Dorset) Ltd | Real estate | 2026 |
| NRG Solutions Global Limited | Professional & scientific | 2026 |
| Nrgconsult Ltd | Professional & scientific | 2024 |
| NSB Group Ltd | Professional & scientific | 2022 |
| NSC Engineering Services Ltd | Professional & scientific | 2023 |
| NSG Electrical Limited | Construction | 2016 |
| NSM Data Limited | Information & communication | 2026 |
| NT Plus Ltd | Professional & scientific | 2021 |
| NTJ Equine and Canine Massage Therapy Ltd | Agriculture & fishing | 2022 |
| Nubis Consultancy Ltd | Information & communication | 2022 |
| Number 9 on the Green Limited | Hospitality | 2015 |
| Number Seven Partners (UK) Limited | Administrative & support | 2010 |
| Numerous Networks Limited | Professional & scientific | 2019 |
| Nuno Silva Limited | Information & communication | 2009 |
| Nurturing Unconscious Talent Specialists Limited | Professional & scientific | 2006 |
| Nushine Ltd | Professional & scientific | 2011 |
| Nuyu Nutrition Club Ltd | Wholesale & retail | 2024 |
| Nymbly Ltd | Professional & scientific | 2016 |
| Nzerem Limited | Information & communication | 2018 |
| O4P Ltd | Real estate | 2022 |
| OAC Homes Limited | Real estate | 2026 |
| Oak & Olive Deli Ltd | Hospitality | 2026 |
| Oak House Holding Limited | Real estate | 2024 |
| Oak Tree (Bestwood) Management Ltd | Real estate | 2015 |
| Oakborne Management Company Limited | Households | 2017 |
| Oakfields Advisors Limited | Professional & scientific | 2015 |