| Negau Property Services Ltd | Real estate | 2018 |
| Negau Technologies Limited | Information & communication | 2011 |
| Negu Assessment & Diagnostic Services Ltd | Health & social care | 2025 |
| NEH Property Limited | Real estate | 2024 |
| Neighbourhood Bounce Limited | Arts & recreation | 2025 |
| Nelson Court (Orwell Green) Residents Association Limited | Households | 1990 |
| NEM Heating Services Ltd | Construction | 2021 |
| Neo-Life Healthcare Limited | Administrative & support | 2021 |
| Neonnova Studios Ltd | Wholesale & retail | 2026 |
| Neonstack Ltd | Information & communication | 2025 |
| NEP Electrical and Building Services Limited | Construction | 2018 |
| Nepts Limited | Professional & scientific | 2010 |
| Neptune Cambridge Limited | Administrative & support | 2019 |
| Neptune Colchester Limited | Administrative & support | 2014 |
| Neptune Court Management Limited | Real estate | 1997 |
| Nerd Nector Ltd | Wholesale & retail | 2025 |
| Nericonnect Ltd | Information & communication | 2025 |
| NES Architectural Limited | Manufacturing | 2013 |
| NES Equipment Limited | Administrative & support | 2013 |
| NES Solutions Limited | Extraterritorial | 2016 |
| NES Visual Thinking Limited | Manufacturing | 2011 |
| Nesa Group Ltd | Real estate | 2026 |
| Nesa Tech Ltd | Wholesale & retail | 2016 |
| Nest Investments Limited | Health & social care | 2014 |
| Nest Surveyors Ltd | Professional & scientific | 2019 |
| Nesthaus Property Ltd | Real estate | 2025 |
| Netcore Limited | Professional & scientific | 2016 |
| Nethart Ltd | Information & communication | 2025 |
| Netmiles Ltd | Wholesale & retail | 2019 |
| Netteswell Orchard (Harlow) Management Company Limited | Households | 1985 |
| Network Media Services Limited | Information & communication | 2009 |
| NETWORK22 Limited | Information & communication | 1999 |
| Neunova Biotech Ltd | Wholesale & retail | 2025 |
| Neura - Natural Cognitive Fuels Limited | Manufacturing | 2018 |
| Neurassist Ltd | Professional & scientific | 2025 |
| Neuro Perspectives Ltd | Health & social care | 2026 |
| Neuro Ventures Limited | Professional & scientific | 2011 |
| Neurodiversity Project (UK) Limited | Education | 2018 |
| Neuronoir CIC | Professional & scientific | 2024 |
| Neve Estates Ltd | Construction | 2024 |
| Neve Studios Ltd | Professional & scientific | 2017 |
| Neveah Ltd | Wholesale & retail | 2024 |
| New Atlas (UK) Limited | Administrative & support | 2001 |
| New Bambu Limited | Hospitality | 2026 |
| New China Kitchen (West Mersea) Limited | Hospitality | 2017 |
| New England Building Services Ltd. | Construction | 2012 |
| New England Property Developments Limited | Construction | 2015 |
| New Fenn Holdings Limited | Financial services | 2019 |
| New Forest Lodge Trading Limited | Hospitality | 2020 |
| New Frontier Care Ltd | Health & social care | 2024 |
| New Ground Breaks Ltd | Professional & scientific | 2025 |
| New Homes Bardfield Road Limited | Construction | 2018 |
| New Homes Braintree Road Limited | Construction | 2018 |
| New Homes Chelmsford Road Limited | Professional & scientific | 2020 |
| New Homes Dunmow Road Limited | Professional & scientific | 2019 |
| New Homes Essex (Group) Limited | Professional & scientific | 2018 |
| New Horizon Travel Limited | Transport & logistics | 1997 |
| New Horizones Ltd | Health & social care | 2014 |
| New Kocher Transport Ltd | Transport & logistics | 2025 |
| New LDN Barbers Ltd | Other services | 2025 |
| New Link Consulting (Europe) Limited | Professional & scientific | 2018 |
| New Link Consulting LLP | | 2011 |
| New Orleans Management Limited | Households | 1960 |
| New Town Community Bike Hub CIC | Administrative & support | 2023 |
| New Town Community Roots CIC | Other services | 2026 |
| New Wave Business Solutions Ltd | Professional & scientific | 1999 |
| New World Limited | Professional & scientific | 1993 |
| Newage Technology Ltd | Information & communication | 2021 |
| Newbridge Services (UK) Ltd | Construction | 2014 |
| Newdwell Properties Limited | Real estate | 2019 |
| Newell Homes Limited | Construction | 2005 |
| Newfield Management Limited | Real estate | 1999 |
| Newline Flooring Limited | Construction | 2012 |
| Newlywood Co Limited | Wholesale & retail | 2026 |
| Newman Refrigeration Group Ltd | Professional & scientific | 2026 |
| Newman Refrigeration Ltd | Other services | 2015 |
| Newman Roofing Services Ltd | Construction | 2022 |
| Newman Service & Response Ltd | Professional & scientific | 2026 |
| Newmove (Southern) Ltd | Real estate | 2020 |
| Newr Industries Ltd | Manufacturing | 2023 |
| Newton Brickwork (Contractors) Ltd. | Construction | 2002 |
| Newton Brickworks Limited | Construction | 2000 |
| Newtons Property Holdings Ltd | Real estate | 2018 |
| Newventure Limited | Real estate | 1997 |
| Newvue Facilities Management Limited | Administrative & support | 2006 |
| Newwave Care Agency Limited | Health & social care | 2022 |
| Newwave Paddleboards Ltd | Administrative & support | 2021 |
| Nexa Detail Ltd | Administrative & support | 2024 |
| Nexa EV Charging Ltd | Energy | 2025 |
| Nexapod Ltd | Construction | 2025 |
| Nexbuild & Management Ltd | Construction | 2020 |
| Nexflo Ltd | Administrative & support | 2019 |
| Nexgenpro TEC Ltd | Information & communication | 2024 |
| Nexledger Limited | Professional & scientific | 2026 |
| Next Chapter Consulting Ltd | Other services | 2023 |
| Next GEN Initiative Ltd | Wholesale & retail | 2025 |
| Next GEN Roof Surveys Limited | Construction | 2025 |
| Next Level Home Improvements Ltd | Construction | 2026 |
| Next Step Flooring Ltd | Construction | 2026 |
| Next Step Learning Limited | Education | 2024 |