| Nc's Vehicle Security Limited | Administrative & support | 2015 |
| ND Smiley CIC | Health & social care | 2025 |
| NDI NZE NA OZO CIC | Education | 2023 |
| Ndreu Construction London Ltd | Construction | 2020 |
| NE London Ltd | Hospitality | 2022 |
| Nealade Limited | Construction | 1972 |
| Neat and Tidy Cleaning Specialist Limited | Other services | 2019 |
| Neat Group Ltd | Financial services | 2026 |
| Neat Touch Limited | Administrative & support | 2025 |
| Neath Swansea Holdings Limited | Real estate | 2024 |
| Neatown Ltd | Manufacturing | 2014 |
| Neave Place (Romford) Management Company Limited | Households | 2013 |
| Neave Place Phase II (Romford) Management Company Limited | Households | 2014 |
| Nebulacraft Digital Solutions Ltd | Information & communication | 2025 |
| Nebus Consulting Limited | Information & communication | 2018 |
| NECAS1977 Ltd | Construction | 2010 |
| Nectar Finance Limited | Financial services | 2023 |
| Need My Herbs Ltd | Manufacturing | 2024 |
| Needle Trade Developments Company Limited | Real estate | 1963 |
| Neethan Brother's Ltd | Wholesale & retail | 2023 |
| Neev Private Ltd | Transport & logistics | 2021 |
| Nefco Management Ltd | Transport & logistics | 2016 |
| Negotiari Londinium Ltd | Hospitality | 2023 |
| Negotiators Family Centre Ltd | Health & social care | 2020 |
| Negotiators Limited | Health & social care | 2007 |
| Negotium Solutions Ltd | Information & communication | 2026 |
| Neighbour Estate Agent Ltd | Real estate | 2020 |
| Neighbourhood Cars Ltd | Transport & logistics | 2014 |
| Neiif Limited | Extraterritorial | 2019 |
| Neil Livemore Consulting Limited | Professional & scientific | 2017 |
| Neil Taylor Electrical Services Limited | Professional & scientific | 2016 |
| Neisha Crawford Medical Services Limited | Health & social care | 2013 |
| Nella’S Properties Ltd | Real estate | 2021 |
| Nelson Business Services Ltd | Administrative & support | 2024 |
| Nelson Estate Croydon Ltd | Real estate | 2018 |
| Nelson Vehicle Repairs Ltd | Wholesale & retail | 2023 |
| Nemours Property Limited | Real estate | 2021 |
| NEO Medical Communications Limited | Professional & scientific | 2024 |
| NEO Native Ltd | Education | 2017 |
| NEOENG-01 Ltd | Construction | 2026 |
| Neon Access Ltd | Construction | 2025 |
| Neon Compliance Ltd | Professional & scientific | 2019 |
| Neotrace Ltd | Education | 2002 |
| Nepali Spice Bazaar Limited | Hospitality | 2019 |
| Neptune Corporate Ltd | Education | 2023 |
| Neptune Leasing Ltd | Administrative & support | 2024 |
| Nerdex IT Ltd | Other services | 2019 |
| Nerenthar Ltd | Information & communication | 2026 |
| Nerihd Management Limited | Real estate | 2019 |
| Nerninate Consulting Limited | Professional & scientific | 2018 |
| Nerola Developments Ltd | Construction | 2023 |
| Nerrols Grange (Taunton) Management Company Limited | Households | 2020 |
| Neru and IRE Ltd | Education | 2025 |
| Neru Investment Group Limited | Financial services | 2025 |
| Nerys Services LLP | | 2025 |
| Ness Lifestyle Ltd | Manufacturing | 2025 |
| Ness-Tech Ltd | Information & communication | 2011 |
| Nessria Essentials Global Ltd | Wholesale & retail | 2020 |
| Nest & Nook Interiors Ltd | Professional & scientific | 2026 |
| Nest Fisheries Limited | Hospitality | 2023 |
| Nest Move Automotive Ltd | Wholesale & retail | 2026 |
| NET Zero Global Limited | Administrative & support | 2020 |
| Netham Court Management Limited | Households | 2006 |
| Netherlands Asmai Plant Nutrition Co., Ltd | Administrative & support | 2025 |
| Netsphere Solutions Ltd | Information & communication | 2024 |
| Network London Partners LLP | | 2015 |
| Network Support (London) Ltd | Information & communication | 2006 |
| Networth Accounting Ltd | Professional & scientific | 2013 |
| Neumathology Care Initiatives Ltd | Health & social care | 2022 |
| Neurabrand Ltd | Professional & scientific | 2026 |
| Neuro Ambassadors Limited | Health & social care | 2019 |
| Neurotic Pictures Ltd | Professional & scientific | 2011 |
| Neurovercy CIC | Professional & scientific | 2025 |
| Neuvonta Advisory Ltd | Professional & scientific | 2025 |
| Nevendon Pet and Tack Centre Limited | Wholesale & retail | 2001 |
| New Addington News Ltd | Wholesale & retail | 2023 |
| New Addington Pathfinders | Health & social care | 2012 |
| New Addington Peoples' Carnival | Arts & recreation | 2010 |
| New Addington Peri Peri Chicken Ltd | Hospitality | 2022 |
| New Beginnings Counselling Ltd | Health & social care | 2026 |
| New Church Court Management Limited | Households | 1988 |
| New Construction & Build Ltd | Administrative & support | 2023 |
| New Crane Wharf Freehold Limited | Households | 1995 |
| New Croydon Mobile Zone Ltd | Other services | 2019 |
| New Dental Ltd | Health & social care | 2024 |
| New ERA Gaming Limited | Wholesale & retail | 2014 |
| New ERA Gourmet Ltd | Hospitality | 2021 |
| New Europe Synergy Ltd | Professional & scientific | 2018 |
| New Garden Design Limited | Real estate | 2024 |
| New Harmony Lodge Ltd | Real estate | 2024 |
| New Harmony Ltd | Administrative & support | 2022 |
| New Home at Last Ltd | Information & communication | 2022 |
| New Horizon Homecare Limited | Health & social care | 2016 |
| New Horizons Management Services Ltd | Administrative & support | 2017 |
| New Hythe Mini Market Ltd | Wholesale & retail | 2018 |
| New Inn Yard Limited | Administrative & support | 2007 |
| New Kemit Limited | Information & communication | 2007 |
| New Life Christian Centre (Croydon) | Education | 2008 |
| New Line Clothing Limited | Manufacturing | 2008 |
| New Millennium Press Limited | Information & communication | 2011 |