| Nc&C Transport Ltd | Transport & logistics | 2023 |
| Nccs Road Express (UK) Ltd | Transport & logistics | 2013 |
| Neasden Homes Limited | Real estate | 2025 |
| Neat Autos Limited | Wholesale & retail | 2006 |
| NEC (UK) Ltd. | Wholesale & retail | 1973 |
| NEC Capital (UK) PLC | Other services | 1987 |
| NEC Display Solutions UK Limited | Professional & scientific | 2000 |
| NEC Europe Ltd | Wholesale & retail | 1993 |
| Nedoz Services Limited | Administrative & support | 2023 |
| Neel Tech Limited | Information & communication | 2014 |
| Neelima Investments Ltd | Real estate | 2021 |
| Neemoyra Limited | Real estate | 2024 |
| Neet Property Group Ltd | Real estate | 2020 |
| Neev Beauty Ltd | Other services | 2024 |
| Nembangs Ltd | Other services | 2020 |
| Nemo (AKS) Limited | Extraterritorial | 1921 |
| Nene Valley Fire and Acoustic Ltd | Construction | 2012 |
| NEO Consultants Ltd | Professional & scientific | 2024 |
| NEO Digital Ltd | Professional & scientific | 2023 |
| NEO Margarita Limited | Professional & scientific | 2014 |
| NEO Properties & Investments Ltd | Real estate | 2022 |
| NEO Tech Holdings Ltd | Financial services | 2022 |
| Neorox Ltd | Information & communication | 2011 |
| Netcreater Digital & Print Ltd | Professional & scientific | 2024 |
| Netlink Property Services Limited | Real estate | 1998 |
| Netsapp Limited | Information & communication | 2016 |
| Network Micro Limited | Wholesale & retail | 2016 |
| Networkace Limited | Real estate | 1991 |
| Neural Foundry Limited | Information & communication | 2021 |
| Neutrality.One Ltd | Information & communication | 2016 |
| Nevada Property Ltd | Real estate | 2025 |
| Nevero Contractors Ltd | Construction | 2017 |
| New AGE Properties Ltd | Real estate | 2026 |
| New AGE Vision Limited | Information & communication | 2022 |
| New Aquilla Limited | Construction | 2020 |
| New Car Rentals Ltd | Transport & logistics | 2012 |
| New Chicken Bite Ltd | Hospitality | 2023 |
| New Chicken Corner Limited | Hospitality | 2019 |
| New City Motors Limited | Wholesale & retail | 2020 |
| New Delicious Catering Ltd | Wholesale & retail | 2019 |
| New Epson Cars Ltd | Administrative & support | 2020 |
| New Forest Lodge Hotel Limited | Hospitality | 2017 |
| New Heights Construction (SH) Ltd | Construction | 2019 |
| New Home Vision Ltd | Construction | 2024 |
| New Horizon Care Home Ltd | Health & social care | 2011 |
| New Innovative Services Ltd | Professional & scientific | 2026 |
| New London College Limited | Education | 2003 |
| New Moon Pizza Plus Chicken Limited | Hospitality | 2023 |
| New Moon Pizza Uxbridge Ltd | Hospitality | 2019 |
| New Style Developments Ltd | Construction | 2021 |
| New Trend Fashion Ltd | Wholesale & retail | 2012 |
| New Urban Enterprises Ltd | Real estate | 2012 |
| Newborn and Beyond Ltd | Education | 2021 |
| Newbuild Plumbing & Heating Limited | Extraterritorial | 2013 |
| Newchime Property Management Limited | Households | 1987 |
| Newday Associates Limited | Administrative & support | 2018 |
| Newens Limited | Real estate | 2019 |
| Newhands Cleaning Limited | Administrative & support | 2024 |
| Newlind Partners Limited | Administrative & support | 2014 |
| Nexen OIL and GAS U.K. Developments LP | | 2008 |
| Nexgen Broadcasting Ltd | Manufacturing | 2024 |
| Nexon CNN Ltd | Manufacturing | 2021 |
| Nexoryn Technologies Ltd | Transport & logistics | 2026 |
| Next Level Homecare Services Ltd | Health & social care | 2017 |
| Next One Builders Ltd | Information & communication | 2023 |
| Next-Gen Empowerment CIC | Health & social care | 2025 |
| Nexus (Holywell Hill) Management Company Limited | Households | 2006 |
| Nexus Investment Portfolio Ltd | Real estate | 2026 |
| Nexus ST. Albans Limited | Households | 2008 |
| Nexus the Educators Connection Limited | Wholesale & retail | 2004 |
| Neyland Court Residents' Association Limited | Households | 1975 |
| Nflg Consultancy Ltd | Construction | 2025 |
| Nfuture Property Ltd | Real estate | 2022 |
| Nguyen Ventures Ltd | Wholesale & retail | 2024 |
| NIA Healthcare Ltd | Health & social care | 2023 |
| Niamassets Limited | Real estate | 2019 |
| Niamh Celine Limited | Wholesale & retail | 2025 |
| Nibber Ltd | Wholesale & retail | 2025 |
| Nice Glass Ltd | Construction | 2018 |
| Nice MED Limited | Wholesale & retail | 2016 |
| Nice Teeth Dental Ltd | Health & social care | 2022 |
| Niche Building Solutions Ltd | Construction | 2023 |
| Niche Technical Services Ltd | Transport & logistics | 2013 |
| Nicholas Andrews Limited | Professional & scientific | 1987 |
| Nicoccino Ltd | Wholesale & retail | 2013 |
| Nicolas Contractors Ltd | Construction | 2011 |
| Nidean Limited | Real estate | 2023 |
| Nigepip Ltd | Manufacturing | 2024 |
| Night Robin RTM Company Limited | Real estate | 2006 |
| Nightswell Limited | Wholesale & retail | 2025 |
| Nihon Sports Limited | Arts & recreation | 2021 |
| Nika Global Ltd | Professional & scientific | 2018 |
| Nikita PAI Films Limited | Information & communication | 2021 |
| Nikki Spencer Limited | Arts & recreation | 2015 |
| Nikkita Chadha Ltd | Arts & recreation | 2024 |
| Nilaish Ltd | Real estate | 2025 |
| Nileva Ltd | Hospitality | 2026 |
| Nine Two Four Products International Ltd | Wholesale & retail | 2024 |
| Ninecirclegroup Ltd | Financial services | 2026 |
| NIR Management Ltd | Real estate | 2012 |