| Mywebhero Ltd | Other services | 2016 |
| MÜ Publishing Limited | Information & communication | 2020 |
| N & C Property Management Limited | Real estate | 2016 |
| N & H Walsh Properties Limited | Real estate | 2019 |
| N a P Investments Limited | Real estate | 2001 |
| N Able R Limited | Construction | 2021 |
| N Collective Limited | Information & communication | 2025 |
| N Silk Solutions Ltd | Professional & scientific | 2018 |
| N Smyth Services Limited | Construction | 2011 |
| N T Electrical Group Limited | Construction | 2021 |
| N&C Property Group Ltd | Construction | 2017 |
| N&J Ceilings Limited | Construction | 2015 |
| N&M Investment Management Ltd | Extraterritorial | 2017 |
| N&M Welding Limited | Manufacturing | 2020 |
| N. Gresty Ltd | Construction | 1997 |
| Naal Consultancy Limited | Professional & scientific | 2023 |
| Nacm Cider Makers Limited | Other services | 2012 |
| Nadeem Sajjad Ltd | Wholesale & retail | 2024 |
| Nags Head Chelmsford Limited | Hospitality | 2025 |
| Nahvalla UK Limited | Wholesale & retail | 2026 |
| Najki Ltd | Wholesale & retail | 2024 |
| Naked Flame Candles (UK) Ltd | Wholesale & retail | 2022 |
| Nalbohor Foods Limited | Hospitality | 2015 |
| Namron Properties Ltd | Real estate | 2018 |
| Nams PVT Ltd | Hospitality | 2025 |
| Nancy Holdings Ltd | Financial services | 2025 |
| Nandrelino Ltd | Wholesale & retail | 2019 |
| Nanyue Investments Ltd | Real estate | 2018 |
| Naodav Limited | Information & communication | 2014 |
| Naomika Properties Limited | Real estate | 2024 |
| NAP Developments Limited | Construction | 2019 |
| Naritive Ltd | Information & communication | 2023 |
| Nascor Creative Agency Limited | Professional & scientific | 2024 |
| Nash & Associates Limited | Other services | 2012 |
| Nashwood Consultancy Limited | Professional & scientific | 2022 |
| Naskad Company Limited | Construction | 2026 |
| Naslada Selection Ltd | Manufacturing | 2016 |
| Nasy Rose Limited | Health & social care | 2021 |
| Natalie Cornish Ltd | Professional & scientific | 2025 |
| Natalie Stack Consultancy Ltd | Health & social care | 2025 |
| Nateck Limited | Professional & scientific | 2023 |
| Nathan Richards Studio Limited | Professional & scientific | 2020 |
| National Apprentice Solutions Ltd | Administrative & support | 2018 |
| National Apprenticeship Solutions Ltd | Extraterritorial | 2018 |
| National Endoscopy Services Ltd | Health & social care | 2022 |
| National Property Lettings Limited | Real estate | 2025 |
| Nationwide Home & Commercial Development Ltd | Construction | 2022 |
| Nationwide Lifting Limited | Extraterritorial | 2021 |
| Nationwide Lifting Solutions Limited | Construction | 2016 |
| Nationwide Plant Solutions Limited | Construction | 2011 |
| Nationwide Site Safety Solutions Limited | Real estate | 2011 |
| Nationwide Tower Cranes Ltd | Extraterritorial | 2017 |
| Nationwide Training Solutions Ltd | Education | 2018 |
| Nationwideleakdetection Ltd | Construction | 2026 |
| Natural Chiropractic Chelmsford (Holdings) Limited | Financial services | 2019 |
| Natural Elements Candles and Skincare Ltd | Manufacturing | 2019 |
| Naturally of Earth Ltd | Wholesale & retail | 2006 |
| Nature's Banquet Ltd | Manufacturing | 2017 |
| Natures Care Hub Ltd | Real estate | 2022 |
| Natures Cook Ltd | Wholesale & retail | 2020 |
| Naughty Patties Ltd | Hospitality | 2026 |
| Nautical Detailing Ltd | Manufacturing | 2024 |
| Navcheth Properties Limited | Real estate | 2023 |
| Navee Technology UK Limited | Information & communication | 2025 |
| Navigation Road Car Parking Limited | Other services | 2011 |
| Navillus Strategies Limited | Information & communication | 2023 |
| Navos Medical Ltd | Health & social care | 2023 |
| Nayden Investments Limited | Financial services | 2020 |
| Nayden Limited | Hospitality | 2018 |
| NB Coaching & Mentoring Ltd | Information & communication | 2019 |
| NB Property EN Ltd | Real estate | 2026 |
| NBQ Media Ltd | Other services | 2023 |
| NC Investigation Services (Ncis) Ltd | Administrative & support | 2009 |
| NC Investment Management Limited | Professional & scientific | 2015 |
| NCC Mechanical Services Trustee Limited | Financial services | 2024 |
| NCH Property Consultants Limited | Professional & scientific | 2017 |
| NCH Retail Property Limited | Real estate | 2025 |
| NCL Express Ltd | Transport & logistics | 2026 |
| NCT 2022 Road Haulage Ltd | Transport & logistics | 2026 |
| ND Spectra Limited | Information & communication | 2022 |
| NDH Chelmsford Limited | Construction | 2020 |
| NEB License Holdings Limited | Professional & scientific | 2026 |
| NEDU20 Limited | Health & social care | 2025 |
| Nedz Tattoo Limited | Other services | 2022 |
| NEE Kazen KAI Martial Arts LLP | | 2015 |
| Need CX Limited | Construction | 2024 |
| Need Room Ltd | Other services | 2015 |
| Neha Ascent Ltd | Information & communication | 2013 |
| Nehal Consultancy Limited | Information & communication | 2018 |
| Nelfresco Ltd | Agriculture & fishing | 2019 |
| Nelsam Limited | Construction | 2005 |
| Nelsam Properties Limited | Construction | 2013 |
| Nemobit Limited | Administrative & support | 2018 |
| Neon Digital Limited | Information & communication | 2004 |
| NEON7 Limited | Hospitality | 2025 |
| Neoteric Official Limited | Wholesale & retail | 2019 |
| Neots Leisure Limited | Arts & recreation | 2018 |
| Nest Healthcare Ltd | Health & social care | 2014 |
| Nest Home Care Essex Ltd | Health & social care | 2020 |
| Nest Workspace Ltd | Real estate | 2019 |