| Nabu Systems Limited | Information & communication | 2024 |
| Nadia TAG Aesthetics Ltd | Other services | 2026 |
| Naeva Skincare Ltd | Wholesale & retail | 2026 |
| Nagomi Drinks Limited | Manufacturing | 2023 |
| Nails by Linh Ltd | Other services | 2021 |
| Nander House Limited | Real estate | 2012 |
| Narvis Ltd | Information & communication | 2018 |
| NAS Associates Ltd | Professional & scientific | 2022 |
| Nashi Limited | Wholesale & retail | 2002 |
| Natalie Winter Ltd | Professional & scientific | 2025 |
| Nathan Massey Ltd | Arts & recreation | 2016 |
| Nationwide Displays Limited | Administrative & support | 2006 |
| Nationwide Leasing Solutions Limited | Administrative & support | 2010 |
| Native to Earth Ltd | Information & communication | 2022 |
| Nature Balanced Limited | Wholesale & retail | 2024 |
| Navio Services Limited | Wholesale & retail | 2021 |
| NCD Equipment Limited | Wholesale & retail | 2014 |
| NCD Holdings Limited | Financial services | 2026 |
| NCE Area 21 Ltd | Other services | 2024 |
| NCS Highway Design Limited | Construction | 2020 |
| NDC Solutions Ltd | Professional & scientific | 2019 |
| NE Strategic Solutions Ltd | Professional & scientific | 2023 |
| NEC Contracting Limited | Professional & scientific | 2019 |
| Neil Forster Electrical Ltd | Administrative & support | 2009 |
| Neil Jennings Ltd | Professional & scientific | 2001 |
| Neil's Healthcare Limited | Health & social care | 2014 |
| Nelbb Limited | Real estate | 2025 |
| Nelson Property Holdings Limited | Real estate | 2017 |
| Nelson Street Ltd | Administrative & support | 2018 |
| Nenecomms Limited | Information & communication | 2022 |
| NEO Developments Limited | Construction | 1958 |
| NEO Global Trading Ltd | Wholesale & retail | 2024 |
| Neoteric Contracts Limited | Construction | 2011 |
| Nepalese Food Southend Limited | Hospitality | 2026 |
| Nepalese Kitchen Southend Limited | Hospitality | 2021 |
| Neristar Limited | Real estate | 2012 |
| Nest Best Ltd | Hospitality | 2018 |
| Networkprogrammable Ltd | Information & communication | 2016 |
| Neuro Empowerment Services Limited | Other services | 2023 |
| Never What IF Group Limited | Financial services | 2015 |
| New Colour Ltd | Construction | 2016 |
| New Confidence PMU Limited | Other services | 2023 |
| New Construction & Design Ltd | Construction | 2010 |
| New Heat Solutions LLP | | 2013 |
| New Lower Thames Transport Tunnel ORG (Nlttt.Org) Limited | Construction | 2013 |
| New Security Solutions Ltd | Administrative & support | 2024 |
| New Spirit JIU Jitsu Ltd | Wholesale & retail | 2025 |
| New Vision Developments UK Limited | Construction | 2002 |
| New-Ox Plant Hire Ltd | Administrative & support | 2023 |
| Newartfilms Limited | Information & communication | 2024 |
| Newday Healthcare Professionals Ltd | Health & social care | 2012 |
| Newlofts Limited | Construction | 2009 |
| Newpeaks Developments Ltd | Construction | 2025 |
| Newport Creative Limited | Professional & scientific | 2020 |
| Newsum Financial Limited | Financial services | 2021 |
| Nexgen Padel Limited | Manufacturing | 2026 |
| Next GEN Construction Group Ltd | Real estate | 2021 |
| Next GEN Facades Ltd | Construction | 2018 |
| Next GEN Fight Hub Limited | Arts & recreation | 2025 |
| Next GEN Projects & Developments Ltd | Construction | 2025 |
| Next GEN Scaffolding & Access Ltd | Construction | 2025 |
| Next GEN Structures Ltd | Construction | 2025 |
| Next Level Life Limited | Other services | 2024 |
| Nextform Structure Ltd | Professional & scientific | 2025 |
| Nextquisite Limited | Information & communication | 2016 |
| Nexus Creative Studio Ltd | Professional & scientific | 2025 |
| Nexus Rehab Limited | Wholesale & retail | 2023 |
| NFZ Traders Limited | Wholesale & retail | 2022 |
| NGS Building Services Limited | Construction | 2009 |
| NGU Capital Limited | Financial services | 2018 |
| NIB Consultancy Services Limited | Professional & scientific | 2025 |
| Nibsbuses Limited | Manufacturing | 1978 |
| Nicholas Caulkett Design Consultancy Ltd | Professional & scientific | 2025 |
| Nichols Group (South East) Limited | Financial services | 2020 |
| Nicky Haslam Studio Limited | Professional & scientific | 2016 |
| Nicola Louise Osteopathy Limited | Health & social care | 2025 |
| Niese (UK) Ltd | Administrative & support | 2025 |
| Nihar Investments Ltd | Real estate | 2022 |
| NIK Motoring Group Ltd | Wholesale & retail | 2026 |
| Nina Hughes Limited | Arts & recreation | 2023 |
| Nine Global Limited | Financial services | 2026 |
| Nine.Productions Limited | Administrative & support | 2023 |
| Ninety SIX Miles Limited | Information & communication | 2015 |
| Nirman Ltd | Professional & scientific | 2020 |
| Niros Consulting Limited | Information & communication | 2016 |
| Nirvana Studios Limited | Information & communication | 2018 |
| Nirvanakv Ltd | Real estate | 2022 |
| Nishi Solutions Limited | Information & communication | 2022 |
| Nixon Technologies Ltd | Information & communication | 2019 |
| NJ Electrical Limited | Construction | 2026 |
| NLS Fencing Ltd | Other services | 2016 |
| Nlttt Ltd | Extraterritorial | 2018 |
| Nnat Developers Limited | Real estate | 2026 |
| NO Chaos Distribution Limited | Wholesale & retail | 2020 |
| Noah's ARK Properties Ltd | Real estate | 2025 |
| Noak Hill Padel Limited | Arts & recreation | 2026 |
| Noble Studio London Ltd | Arts & recreation | 2015 |
| Noble Victories Healthcare Ltd | Real estate | 2024 |
| Noether Floristry Ltd | Wholesale & retail | 2025 |
| Noise-Tech Engineering Limited | Real estate | 1993 |