| Neat & Co Facilities Limited | Transport & logistics | 2026 |
| Nebula Press Limited | Information & communication | 2025 |
| Neds Consultancy Ltd | Professional & scientific | 2026 |
| Neem Biotech Ltd | Professional & scientific | 1998 |
| Neighbourhood Narratives CIC | Arts & recreation | 2026 |
| Neil Callan Racing Ltd | Arts & recreation | 2004 |
| Nelgus Holdings Limited | Real estate | 1999 |
| Nelly’S Dessert Club Ltd | Hospitality | 2025 |
| Neoncleaning Ltd | Administrative & support | 2022 |
| Netmediasolutions Ltd | Other services | 2021 |
| Neuro Herts Rehabilitation Limited Liability Partnership | | 2022 |
| Neuro Physio Connect Ltd | Health & social care | 2023 |
| Neutra Ltd | Administrative & support | 2024 |
| Nevada Engineering Company Limited | Manufacturing | 1979 |
| Neville Richardson Limited | Manufacturing | 2016 |
| New Base Limited | Information & communication | 2022 |
| New BIO Ltd | Extraterritorial | 2012 |
| New Dawn Carpentry and Construction Ltd | Construction | 2024 |
| New Dimension Exhibitions Limited | Construction | 1970 |
| New Dimension H Limited | Financial services | 2014 |
| New England Biolabs (U.K.) Limited | Wholesale & retail | 1993 |
| New Forest Production Limited | Information & communication | 2026 |
| New Hall Farm Shop Limited | Wholesale & retail | 2025 |
| New Leaf Bridge Ltd | Other services | 2025 |
| New Life Building Services (Hertfordshire) Limited | Construction | 2012 |
| New Noise Audio Limited | Arts & recreation | 2015 |
| New Paprika Ltd | Hospitality | 2019 |
| New Place Consulting Limited | Professional & scientific | 2012 |
| New Town Freelance Limited | Professional & scientific | 2022 |
| Newman Knight and Co Ltd | Financial services | 2008 |
| Newman Knight Properties Limited | Real estate | 2021 |
| Newport Enterprise Solutions Limited | Professional & scientific | 2022 |
| Newsound Media (Hitchin) Ltd | Professional & scientific | 2019 |
| Newteq Support Limited | Information & communication | 2013 |
| Newton House Manco Ltd | Households | 2023 |
| Newtonmic Limited | Health & social care | 2025 |
| Newtown Wiring Limited | Other services | 2020 |
| Nexa Wealth Management Limited | Professional & scientific | 2025 |
| Nextphase Synergy Ltd | Information & communication | 2025 |
| Nexus (West London) Limited | Real estate | 2004 |
| Nexus Property Developments (West London) Limited | Real estate | 2018 |
| Nexus Restorations Ltd | Administrative & support | 2010 |
| Nezar Clinical Research Limited | Professional & scientific | 2025 |
| NGC Consulting Ltd | Information & communication | 2022 |
| NGE Renders Ltd | Construction | 2024 |
| NH Communications Limited | Information & communication | 2006 |
| NHM Limited | Arts & recreation | 2015 |
| Niamh Coughlan Limited | Manufacturing | 2025 |
| Niashad Ltd | Health & social care | 2017 |
| Nice and Easy Limited | Information & communication | 2018 |
| Nicetri Events Limited | Arts & recreation | 2013 |
| Niche Generics Limited | Manufacturing | 2002 |
| Nichol Pharma Services Ltd | Professional & scientific | 2011 |
| Nicholson Services Limited | Manufacturing | 2002 |
| Nicole Lamparska Photography Ltd | Professional & scientific | 2025 |
| Nicole Sequeira Limited | Wholesale & retail | 2017 |
| Nigel Chapman Music Limited | Education | 2015 |
| Nikk Hope Music Ltd | Professional & scientific | 2021 |
| Nimos Limited | Information & communication | 2000 |
| Nine Yards PR Limited | Professional & scientific | 2017 |
| Nirvair Care Ltd | Health & social care | 2023 |
| Nirvair Developments Ltd | Real estate | 2021 |
| Nividous UK Limited | Information & communication | 2018 |
| NJ101 Ltd | Health & social care | 2025 |
| NJK Medicals Ltd | Health & social care | 2025 |
| Nkap LEM Limited | Professional & scientific | 2024 |
| NKJ Enterprises Ltd | Construction | 2012 |
| NLA International Ltd | Professional & scientific | 2017 |
| NM Timber Ltd | Wholesale & retail | 2024 |
| NMT Property Limited | Real estate | 2025 |
| NO Fuss Records Limited | Arts & recreation | 2017 |
| NO Label London Ltd. | Real estate | 2019 |
| NO Nonsense Design Ltd | Professional & scientific | 2006 |
| NO Regret Solution Ltd | Wholesale & retail | 2025 |
| NO.10 Hair & Beauty Limited | Other services | 2024 |
| NO.10 Hair Limited | Other services | 2024 |
| Noavar Strategy Ltd | Professional & scientific | 2026 |
| Nobullcarcare Ltd | Wholesale & retail | 2022 |
| Node Stud Farm Ltd | Agriculture & fishing | 2023 |
| Nodo Labs Ltd | Information & communication | 2026 |
| Noir INK Group Ltd | Arts & recreation | 2026 |
| Noko Lifestyle Ltd | Other services | 2025 |
| Nomoli Holdings (Happisburgh) Ltd | Construction | 2022 |
| Nomoli Holdings (the Gardens) Ltd | Construction | 2024 |
| Nomoli Holdings Limited | Financial services | 2021 |
| Non/Native CIC | Education | 2022 |
| Nonon Limited | Professional & scientific | 2007 |
| Noortec Group Ltd | Construction | 2019 |
| Norbiton Newco Limited | Wholesale & retail | 2025 |
| Nordhaven Capital Ltd | Real estate | 2025 |
| Norgans Lettings and Property Management Limited | Real estate | 2017 |
| Norgans New Homes Limited | Real estate | 2003 |
| Norgrove Ltd | Financial services | 2024 |
| Norman Limited | Real estate | 1981 |
| North Hertfordshire Centre for Voluntary Service Limited | Administrative & support | 2003 |
| North Herts Arena Limited | Arts & recreation | 2015 |
| North Herts Pride CIC | Arts & recreation | 2023 |
| North Herts Property Management Ltd | Real estate | 2023 |
| North Herts Property Services Limited | Real estate | 2008 |
| North Herts Storage Limited | Real estate | 2019 |