| Newark-On-Trent Masonic Hall Co Limited(The) | Other services | 1939 |
| Newboults Ltd | Manufacturing | 2026 |
| Newgate (Newark) Group Limited | Financial services | 2025 |
| Newgate (Rail) Limited | Manufacturing | 2025 |
| Newnet Broadband Limited | Extraterritorial | 2009 |
| Newtec Plumbing & Heating Limited | Construction | 2002 |
| Newton Broadcasting Limited | Information & communication | 2024 |
| Newton Energi Limited | Construction | 2016 |
| Newton Energy Limited | Construction | 2023 |
| Newton H2 Ltd | Administrative & support | 2020 |
| Newton Utility Services Ltd | Construction | 2026 |
| Newvan Estates Ltd | Construction | 2025 |
| Nexcore Solutions Tech Ltd | Wholesale & retail | 2024 |
| Next Move Property Investments Limited | Real estate | 2024 |
| Next Step Recruitment Limited | Administrative & support | 2007 |
| Nextgen Accountingpro Ltd | Professional & scientific | 2025 |
| Nexus Business Consulting Services Limited | Professional & scientific | 2024 |
| Nexus Group Solutions Ltd | Real estate | 2023 |
| NG23 Consulting Limited | Professional & scientific | 2015 |
| NG23 Tender Support Limited | Professional & scientific | 2012 |
| NGS Mawer Ltd | Construction | 2017 |
| Nguyet PHAN9 Limited | Other services | 2023 |
| NHM Solutions Limited | Information & communication | 2006 |
| Nice Motors Limited | Wholesale & retail | 2017 |
| Nicholas Benjamin Limited | Hospitality | 2014 |
| Nicholson Veterinary Centre Ltd | Professional & scientific | 2025 |
| Nick Fenton Physiotherapy Ltd | Health & social care | 2013 |
| Nick Gordon Consulting Limited | Professional & scientific | 2023 |
| Nick Hutchings Architect Limited | Professional & scientific | 2014 |
| Nickcooperviolins Limited | Manufacturing | 2013 |
| Nicker Hill Phase 1 Management Company Limited | Construction | 2023 |
| Nickgeo Limited | Professional & scientific | 2017 |
| Nigel Leech Limited | Administrative & support | 2012 |
| Nikkiservices Ltd | Wholesale & retail | 2025 |
| Nimos Properties Limited | Real estate | 2013 |
| Nimrack Limited | Real estate | 2024 |
| Nineteen Solutions Ltd | Wholesale & retail | 2011 |
| NJB Commissioning Ltd | Professional & scientific | 2019 |
| NJP Projects Ltd | Professional & scientific | 2021 |
| NJR Building and Electrical Services Ltd | Construction | 2025 |
| NLK Contracts Ltd | Construction | 2026 |
| Nnas (Trading) Limited | Hospitality | 1994 |
| NO Picnic Limited | Information & communication | 2013 |
| NO.3 Syndicate Ltd | Wholesale & retail | 2025 |
| Noble Insurance Group Ltd | Financial services | 2018 |
| Noble Insurance Services Ltd | Financial services | 1989 |
| Noble Trading & Lifestyle Ltd | Wholesale & retail | 2020 |
| Nocona Limited | Manufacturing | 2022 |
| Noodle Consulting Limited | Professional & scientific | 2026 |
| Nook & Nest Property Ltd | Real estate | 2026 |
| Noquet Building Services Ltd | Professional & scientific | 2023 |
| Noquet Civil Structural Ltd | Construction | 2026 |
| Noquet Property Services Ltd | Real estate | 2025 |
| Norder Product Developments Ltd | Professional & scientific | 2015 |
| Nordstar Property Group Ltd | Construction | 2025 |
| Norfolk Buildsmith Limited | Construction | 2024 |
| North Notts Blinds (Retail) Limited | Wholesale & retail | 2006 |
| North West Gastro Limited | Health & social care | 2017 |
| Northern Road (Service & Engineering) Centre Ltd | Manufacturing | 2011 |
| Northgate Lettings Limited | Construction | 2012 |
| Norton Disney Farming Limited | Agriculture & fishing | 1996 |
| NOT My Monkey Ltd | Hospitality | 2022 |
| Nothing Much Ltd | Wholesale & retail | 2015 |
| Nottinghamshire Horseboxes Limited | Wholesale & retail | 2024 |
| Nottinghamshire, Lincolnshire & Derbyshire Rugby Football Union Ltd | Arts & recreation | 2001 |
| Notts & Derbys Golf and Leisure Limited | Arts & recreation | 2018 |
| Novalia OK Limited | Real estate | 2021 |
| Novart Ltd | Wholesale & retail | 2018 |
| NOVSR01 Limited | Arts & recreation | 2021 |
| NOW Homes Limited | Real estate | 2010 |
| NOW Limited | Wholesale & retail | 2016 |
| Nowamart Ltd | Wholesale & retail | 2014 |
| NP Portfolios Ltd | Real estate | 2022 |
| NPM Groundworks Limited | Construction | 2021 |
| NPW Lettings Limited | Real estate | 2025 |
| NR Property Group Ltd | Real estate | 2025 |
| NRS (Nottingham) Limited | Construction | 1995 |
| NRS Driving & Logistics Services Limited | Transport & logistics | 2016 |
| Nsbv Projects Limited | Construction | 2018 |
| NSW Plumbing Supplies Limited | Wholesale & retail | 2023 |
| NT Operational Management Services Ltd | Professional & scientific | 2021 |
| NTS Executive Travel Limited | Transport & logistics | 2018 |
| Nubeau Holdings Limited | Administrative & support | 2015 |
| Nuggets Galore Limited | Extraterritorial | 2015 |
| Nulli Secundus Ltd | Construction | 2015 |
| Number Fourteen Limited | Real estate | 2020 |
| NUR Professionals Limited | Health & social care | 2012 |
| Nura Skin Ltd | Health & social care | 2023 |
| Nuvver Associates Limited | Professional & scientific | 2012 |
| NWB Hire Ltd | Arts & recreation | 2020 |
| NXG Technology Ltd | Information & communication | 2016 |
| NXT Bosworth Limited | Real estate | 2026 |
| NXT Equity Limited | Wholesale & retail | 2020 |
| NYP Social Limited | Administrative & support | 2021 |
| O Croft Limited | Households | 2024 |
| O9D Technology Ltd | Information & communication | 2023 |
| Oak Mortgages Limited | Financial services | 2024 |
| Oakfield Construction Lincoln Ltd | Construction | 2017 |
| OAKLANDS87 Limited | Real estate | 2025 |
| Oaklyn Properties Ltd | Real estate | 2019 |