| Nixons Kitchens Limited | Extraterritorial | 2010 |
| NJB Property Holdings Ltd | Real estate | 2020 |
| NJD Environmental Associates Ltd | Professional & scientific | 2017 |
| NJK Global Consulting Limited | Professional & scientific | 2024 |
| NJW Recruitment Ltd | Administrative & support | 2018 |
| NK and RA Limited | Hospitality | 2019 |
| NK Armoury Ltd | Wholesale & retail | 2025 |
| NK Commercial Properties Ltd | Real estate | 2019 |
| NK Consultancy One Limited | Health & social care | 2024 |
| NK Houses Limited | Real estate | 2020 |
| NK Magnus Ltd | Hospitality | 2025 |
| NK North Limited | Wholesale & retail | 2024 |
| NK Property Ltd | Real estate | 2015 |
| NK South Ltd | Real estate | 2025 |
| NL Practice Limited | Health & social care | 2011 |
| NLAH1 Limited | Financial services | 2017 |
| Nland Ltd | Administrative & support | 2021 |
| NLD Estates Ltd | Real estate | 2017 |
| Nlms Nurseries Ltd | Health & social care | 2014 |
| NLT Learning Limited | Extraterritorial | 2005 |
| NLT Properties (NE) Limited | Real estate | 2024 |
| Nlth Limited | Professional & scientific | 2022 |
| NM Foods NE Ltd | Hospitality | 2025 |
| NM Media Group Ltd | Information & communication | 2018 |
| NM Software Solutions Ltd | Information & communication | 2019 |
| Nmac Limited | Other services | 2006 |
| NMC TM Ltd | Construction | 2022 |
| Nmpc Associates Ltd | Administrative & support | 2011 |
| NND Investments Ltd | Wholesale & retail | 2025 |
| NO 8 Castle Stairs Limited | Hospitality | 2023 |
| NO Scrubs Domestic Cleaning Ltd | Administrative & support | 2023 |
| NO Surrender Health & Fitness Ltd | Extraterritorial | 2021 |
| NO Sweat Fitness Limited | Arts & recreation | 2023 |
| NO Sweat IP Limited | Administrative & support | 2026 |
| NO.1 Property Developments Ltd | Real estate | 2023 |
| NO.1 Supplements Holdings Limited | Financial services | 2021 |
| NO.26 Bakehouse Limited | Hospitality | 2025 |
| NO.34 Grosvenor Place Management Limited | Households | 1996 |
| NO1 Care Ltd | Health & social care | 2014 |
| NO1 Gym Ltd | Arts & recreation | 2015 |
| NO1 Online Ltd | Wholesale & retail | 2025 |
| NO3 Consulting Limited | Professional & scientific | 2024 |
| Nobab Noyagram Ltd | Real estate | 2024 |
| Nobility Care Ltd | Health & social care | 2023 |
| Noble Corp Ltd | Arts & recreation | 2019 |
| Noble Ledger Ltd | Wholesale & retail | 2025 |
| Noble Minds Education Ltd | Education | 2025 |
| Nobles Group Newcastle Ltd | Households | 2021 |
| Noce Consultancy Limited | Information & communication | 2022 |
| Nocurb Limited | Wholesale & retail | 2024 |
| Noda Taxis Limited | Transport & logistics | 2007 |
| Noda Taxis NE Limited | Transport & logistics | 2025 |
| Noel Harris Home Sales Limited | Real estate | 2016 |
| Noemí Carrasco Garrido Ltd | Administrative & support | 2025 |
| Noggin HQ Ltd | Information & communication | 2021 |
| NOI 2 Limited | Real estate | 2002 |
| NOI4 Limited | Real estate | 2007 |
| Noiafit Limited | Health & social care | 2025 |
| Noise Creative Ltd. | Professional & scientific | 2018 |
| Nolato Holdings UK Limited | Financial services | 2012 |
| Nolato Jaycare Limited | Manufacturing | 1958 |
| Nomad QA Ltd | Information & communication | 2024 |
| Nomad Sauna Ltd | Other services | 2024 |
| Nomie and Asma Investments Ltd | Real estate | 2025 |
| Nominees Blackfriars Ltd | Real estate | 2015 |
| Nomo Holding Ltd | Real estate | 2026 |
| Non-Ionising Radiation Services Ltd | Professional & scientific | 2025 |
| Nonica Ltd | Transport & logistics | 2025 |
| Nonlinear Technologies Limited | Information & communication | 2007 |
| Nooks Creative Limited | Information & communication | 2025 |
| Nooli EAR Defenders Ltd | Manufacturing | 2026 |
| Noor Network CIC | Education | 2026 |
| Noora Stores Ltd | Wholesale & retail | 2023 |
| Nor-Clean Limited | Wholesale & retail | 1972 |
| Noraventra Limited | Wholesale & retail | 2025 |
| Norburn Park Management Company Limited | Households | 2006 |
| Nord Films Ltd | Information & communication | 2020 |
| Norden House Limited | Other services | 2012 |
| Nordhouse Limited | Manufacturing | 2025 |
| Norfran Aluminium Limited | Manufacturing | 1982 |
| Norham House 2 Limited | Real estate | 2004 |
| Norham House 3 Limited | Extraterritorial | 2004 |
| Norlite Windows Limited | Manufacturing | 1990 |
| Norman Bass Limited | Wholesale & retail | 2025 |
| Normedica International Ltd | Wholesale & retail | 2022 |
| Normedica Limited | Extraterritorial | 2009 |
| Norsea UK Limited | Transport & logistics | 2007 |
| Norseman Travel Holdings Limited | Professional & scientific | 2011 |
| Norseman Travel Limited | Administrative & support | 1981 |
| Norstead Limited | Construction | 1998 |
| North & Sons NE Ltd | Construction | 2025 |
| North (UK) Limited | Hospitality | 2000 |
| North Alignment Limited | Financial services | 2023 |
| North Automation Group Ltd | Manufacturing | 2021 |
| North Bar Properties Limited | Real estate | 2004 |
| North Based Plumbing Solutions Ltd | Construction | 2025 |
| North Birmingham Futsal Ltd | Arts & recreation | 2018 |
| North Building and Maintenance Services Ltd | Construction | 2017 |
| North East Adhd Limited | Health & social care | 2019 |
| North East and National Property Services Ltd | Construction | 2025 |