| Neville&Rodell Ltd | Administrative & support | 2025 |
| New Direction Property Ltd | Construction | 2023 |
| New Earth Solutions (Canford) Limited | Other services | 2007 |
| New Earth Solutions (West) Limited | Other services | 2009 |
| New Horizon Flowers Limited | Wholesale & retail | 2013 |
| New Newark Sushi Limited | Wholesale & retail | 2024 |
| New Peterborough Sushi Ltd | Hospitality | 2023 |
| New Somerby Consulting Ltd | Professional & scientific | 2012 |
| Newborough Dental Surgery Limited | Health & social care | 2009 |
| Newman and Whitelaw Associates Ltd | Professional & scientific | 2025 |
| Newton Capital LLP | | 2016 |
| Newton MSK Ltd | Health & social care | 2019 |
| Newton Sushi Limited | Hospitality | 2024 |
| Newzie.Tech Limited | Information & communication | 2023 |
| Nexohc Ltd | Wholesale & retail | 2021 |
| NG Bar Co Limited | Hospitality | 2025 |
| NG Lettings & Management Ltd | Real estate | 2019 |
| NG Rail Ltd | Construction | 2020 |
| NGD Construction Ltd | Construction | 2023 |
| NGS Interior Solutions Limited | Construction | 2024 |
| Nibends Sustainable Ltd | Professional & scientific | 2022 |
| Nicholas Ward Limited | Administrative & support | 2011 |
| Nidgery LLP | | 2010 |
| Nielsen Racing Ltd | Professional & scientific | 2014 |
| Nigel LEE Consulting Ltd | Professional & scientific | 2024 |
| Ninec Limited | Professional & scientific | 2017 |
| Ninjastar Capital Ltd | Financial services | 2026 |
| Nirvana Optical Solutions Ltd | Information & communication | 2024 |
| NIRVANA8 Ltd | Hospitality | 2024 |
| NIS Developments Limited | Construction | 2009 |
| Nixbodyshop Limited | Wholesale & retail | 2013 |
| NJ Garton Ltd | Administrative & support | 2024 |
| NJM Business Services Ltd | Professional & scientific | 2016 |
| NJT Group Limited | Wholesale & retail | 2015 |
| NK Energy Services Ltd | Professional & scientific | 2026 |
| NO Daniels Ltd | Administrative & support | 2022 |
| Noble ROT Fine Wine Limited | Wholesale & retail | 2019 |
| Nomina NO 134 LLP | | 2006 |
| Nomina NO 193 LLP | | 2006 |
| Nomina NO 373 LLP | | 2007 |
| Nomina NO 378 LLP | | 2007 |
| Nomina NO 396 LLP | | 2007 |
| Nomina NO 464 LLP | | 2008 |
| Nomina NO 531 LLP | | 2009 |
| Nomina NO 540 LLP | | 2009 |
| Nomina NO 585 LLP | | 2013 |
| Nomina NO. 001 LLP | | 2006 |
| Nomina NO. 002 LLP | | 2006 |
| Nomina NO. 058 LLP | | 2006 |
| Nonconformity Company Ltd | Education | 2024 |
| Noodle Grantham Limited | Hospitality | 2026 |
| Norfolk Bakehouse Limited | Manufacturing | 2015 |
| Norfolk Stay Ltd | Real estate | 2021 |
| Normont Ltd | Financial services | 2023 |
| North Glen Property Ltd | Construction | 2025 |
| Northern Industrial (General Partners) Limited | Real estate | 1998 |
| Northern Industrial Limited | Real estate | 1997 |
| Northern Industrial LP | | 1999 |
| Northwood Consuma Tissue Ltd | Manufacturing | 2015 |
| Nosco Films Ltd | Information & communication | 2024 |
| Notions Antiques Centre Ltd | Wholesale & retail | 2019 |
| Nottingham BTL Limited | Real estate | 2023 |
| Nottingham Properties Limited | Construction | 2018 |
| Nottingham Road Properties Limited | Real estate | 2023 |
| Nottingham Westminster Hotel Limited | Hospitality | 2026 |
| Nova Ghost Company Ltd | Hospitality | 2025 |
| Nova Marketing Group Ltd | Professional & scientific | 2025 |
| Novalink Recruitment Ltd | Administrative & support | 2025 |
| Novel Games Ltd | Information & communication | 2012 |
| Noza Medix Ltd | Health & social care | 2022 |
| NPR & V3 Retail Ltd | Wholesale & retail | 2020 |
| NU Growth Theory Ltd | Professional & scientific | 2023 |
| Oak Manor Lettings Ltd | Real estate | 2024 |
| Oak Valley Investments Ltd | Financial services | 2025 |
| Oak Willow Property Limited | Real estate | 2024 |
| Oakbrook Underwriting LLP | | 2010 |
| Oakley Mellows Ltd | Manufacturing | 2020 |
| Oaksfield Care Ltd | Health & social care | 2019 |
| Oasby Garden Solutions Limited | Administrative & support | 2021 |
| Oasis Cover Limited | Financial services | 2010 |
| Obsidian Aerial Arts Ltd | Arts & recreation | 2025 |
| OES (Lincs) Ltd | Manufacturing | 2019 |
| Off-Piste Coaching (UK) Limited | Professional & scientific | 2021 |
| Office Cleaning Co Ltd | Administrative & support | 2018 |
| Ohww Marketing Ltd | Information & communication | 2017 |
| Ojala Capital Limited | Administrative & support | 2014 |
| Oldrid & Co.,Limited | Wholesale & retail | 1934 |
| Oldrid (North Lincolnshire) Limited | Wholesale & retail | 2012 |
| Olgate Limited | Real estate | 1987 |
| OM Craft Ltd | Construction | 2023 |
| ON Point Machinery and Tooling Group Ltd | Manufacturing | 2020 |
| ON Point Machinery Ltd | Manufacturing | 2017 |
| ON Point Tooling Ltd | Wholesale & retail | 2018 |
| One Leisure Grantham Ltd | Other services | 2023 |
| Ongaha Capital Limited | Financial services | 2014 |
| Ongaha LLP | | 2008 |
| Onis Consulting Limited | Professional & scientific | 2014 |
| Ooh-La-La Productions Ltd | Professional & scientific | 2006 |
| Oops Insurance Services Limited | Financial services | 2018 |
| Oosh Design Limited | Wholesale & retail | 2022 |