| Newport Farm Residents Management Company Limited | Professional & scientific | 2008 |
| Newport Fish Bar Ltd | Hospitality | 2023 |
| Newport General Trading Limited | Construction | 1997 |
| Newton & Bailey Limited | Wholesale & retail | 2020 |
| Newton Fallowell (Lincoln) Limited | Real estate | 2006 |
| Newton Fallowell (Sleaford Lettings) Limited | Real estate | 2006 |
| Nexelara Shop Limited | Wholesale & retail | 2024 |
| Nexgen Plumbing Ltd | Construction | 2023 |
| Nexhaul Logistics Ltd | Transport & logistics | 2025 |
| Nexma Ltd | Information & communication | 2024 |
| Next Event Developments Limited | Real estate | 2004 |
| Next Event Limited | Other services | 1996 |
| Next Level Tennis LLP | | 2022 |
| Next Step Investments Limited | Real estate | 2011 |
| Nexus Design Solutions Ltd | Administrative & support | 2014 |
| Nexus Sales and Marketing Ltd | Professional & scientific | 2015 |
| NG15 Ltd | Manufacturing | 2001 |
| NGB Plastering Limited | Construction | 2022 |
| NGC Wealth Management Limited | Financial services | 2012 |
| NI HAO Delhi Ltd | Hospitality | 2026 |
| Nice White Limited | Real estate | 2015 |
| Nichiren Shoshu Buddhist Association | Information & communication | 2005 |
| Nicholas Martin Cabinets Ltd | Manufacturing | 2006 |
| Nicholson Roofing Ltd | Construction | 2020 |
| Nicholsons Accountants Limited | Professional & scientific | 2015 |
| Nicholsons Audit Ltd | Professional & scientific | 2021 |
| Nicholsons People Limited | Administrative & support | 2022 |
| Nick James Consulting Engineers Limited | Professional & scientific | 2020 |
| Nick Owen Publishing Ltd | Professional & scientific | 2015 |
| Nick Stone Media Ltd | Information & communication | 2011 |
| Nick Taylor Mortgage Solutions Limited | Professional & scientific | 2018 |
| Nickate Ltd | Wholesale & retail | 2011 |
| Nickell GAS Heating & Plumbing Ltd | Construction | 2021 |
| Nico FIX Ltd | Construction | 2020 |
| Nicola Steel Paediatric Case Management Ltd | Professional & scientific | 2020 |
| Nicola's Hair Salon Ltd | Other services | 2012 |
| Nicoll Mortgage Solutions Ltd | Financial services | 2018 |
| Nicolson Motor Group Ltd | Wholesale & retail | 2020 |
| Nifxtie Limited | Health & social care | 2022 |
| Nigel Moore Electrical Contractors Ltd | Construction | 2002 |
| Nigel Smith Plumbing and Mechanical Services (Holdings) Limited | Financial services | 2017 |
| Nigel Smith Plumbing and Mechanical Services Ltd | Construction | 1991 |
| Nigel's Driving Ltd | Transport & logistics | 2024 |
| Nightingale Mews (Lincoln) Management Limited | Households | 2012 |
| Nikesh Thiruchelvam Limited | Health & social care | 2014 |
| NIL Barber Ltd | Other services | 2026 |
| Nilaai Technology Solutions Limited | Information & communication | 2013 |
| Nile Line Digital Solutions Ltd | Information & communication | 2024 |
| Nilinjoh Limited | Manufacturing | 2014 |
| Nimble Trade Limited | Wholesale & retail | 2026 |
| Nimish Shah Ltd | Health & social care | 2010 |
| Nimitt Private Ltd | Wholesale & retail | 2024 |
| Nine Earth Limited | Real estate | 2018 |
| Nine Star Property Ltd | Households | 2022 |
| Niqueonline Ltd | Wholesale & retail | 2021 |
| Nirkat Property Limited | Real estate | 2019 |
| Nishan Transport Limited | Transport & logistics | 2025 |
| Nissr Consultancy Limited | Health & social care | 2013 |
| Nistor&Son Transport Ltd | Transport & logistics | 2026 |
| Nivaas Private Limited | Real estate | 2026 |
| NJ Cooling Services Limited | Construction | 2016 |
| NJ Haulage Ltd | Transport & logistics | 2025 |
| NJ Hewis QS Services Limited | Professional & scientific | 2008 |
| NJ Management and Consultancy Services Limited | Professional & scientific | 2022 |
| NJ Recovery Limited | Transport & logistics | 2021 |
| NJC Chiro Limited | Health & social care | 2022 |
| NJH Aesthetics Ltd | Health & social care | 2022 |
| NJM Business Mentor Ltd | Professional & scientific | 2017 |
| Njord Development Limited | Professional & scientific | 2022 |
| NJS Noise Control Limited | Professional & scientific | 2020 |
| NL Networks Ltd | Information & communication | 2025 |
| NLC Property Solutions Ltd | Other services | 2023 |
| NLF Building Services Limited | Administrative & support | 2011 |
| Nlovu S M Ltd | Health & social care | 2021 |
| Nnadis Synergy Resources Limited | Professional & scientific | 2024 |
| Nnatu Consulting Ltd | Health & social care | 2022 |
| NO Reins CIC | Health & social care | 2025 |
| NO.7 Coffee House & Bar Ltd | Hospitality | 2025 |
| NO1 British Boilers Ltd | Construction | 2022 |
| Noat Inc Ltd | Wholesale & retail | 2023 |
| Noble Developments(Midlands) Ltd | Construction | 2019 |
| Noble Wood CIC | Information & communication | 2025 |
| Nocton Advisory Limited | Professional & scientific | 2021 |
| Nocton Heath Garage Ltd | Wholesale & retail | 2003 |
| Noctryx Ltd | Wholesale & retail | 2026 |
| Noise Academy Community CIC | Information & communication | 2024 |
| Noise Academy Ltd | Education | 2019 |
| Nokusa Ltd | Transport & logistics | 2022 |
| Nolanlandonjameson Limited | Wholesale & retail | 2025 |
| Nomei Ltd | Information & communication | 2018 |
| Nomix Enviro Limited | Manufacturing | 2017 |
| Nonna Juana Ltd | Manufacturing | 2021 |
| Noor Suites Ltd | Real estate | 2025 |
| Norbeck Property Development Limited | Real estate | 2015 |
| Norfleet(Pms) Ltd. | Households | 2019 |
| Norfolk Holiday Lets Limited | Extraterritorial | 2006 |
| Norfolk Residential Parks Ltd | Hospitality | 2014 |
| Norris Property Solutions Limited | Real estate | 2018 |
| Norse Chiropractic and Rehabilitation Ltd | Health & social care | 2023 |
| North Denim Limited | Wholesale & retail | 2026 |