| NA Andreev Limited | Transport & logistics | 2015 |
| Nafex Limited | Information & communication | 2017 |
| Nafex Pro Limited | Real estate | 2024 |
| Naija Street Food Ltd | Hospitality | 2023 |
| Nail LAB Limited | Other services | 2026 |
| Najaar Ltd | Other services | 2024 |
| NAK Care Services Limited | Health & social care | 2023 |
| Naman Holdings Limited | Hospitality | 2016 |
| Namo Collections Ltd | Other services | 2015 |
| Nanamaxi Contractor Limited | Construction | 2024 |
| Nandykay Ltd | Health & social care | 2025 |
| Napwood Construction Ltd | Construction | 2025 |
| Naqba Ltd | Wholesale & retail | 2025 |
| Narps Limited | Other services | 2007 |
| Nasbrends Ltd | Administrative & support | 2021 |
| Naseri Premier Estates Ltd | Real estate | 2026 |
| NAT Field Services Ltd | Wholesale & retail | 2023 |
| Natalia Natasha Ltd | Construction | 2025 |
| Natch Play Limited | Administrative & support | 2021 |
| Nathan Pitt Property Services LLP | | 2025 |
| National Care Association | Other services | 1990 |
| National Care Homes Association | Professional & scientific | 2005 |
| Natixity Limited | Information & communication | 2025 |
| Navio Auto Services Ltd | Wholesale & retail | 2026 |
| Navkit Limited | Administrative & support | 2009 |
| Navy Goose Limited | Wholesale & retail | 2025 |
| Navy Property Solutions Limited | Real estate | 2025 |
| Naz's Rasoi Limited | Hospitality | 2019 |
| Nazckos Health Care Ltd | Health & social care | 2015 |
| Nbgms Limited | Information & communication | 2022 |
| Ndav Limited | Information & communication | 2010 |
| Ndedeba Ventures Ltd | Real estate | 2025 |
| NDS Trans Ltd | Transport & logistics | 2025 |
| Nearski Ltd | Information & communication | 2020 |
| Neat Seats Ltd | Administrative & support | 2019 |
| Necessity Health & Fitness Ltd | Education | 2020 |
| Needham Shelby Ltd | Real estate | 2020 |
| Neiaoil Limited | Wholesale & retail | 2024 |
| Neighbourhood Health Club Ltd | Arts & recreation | 2026 |
| Neil Yates Recovery Limited | Transport & logistics | 2000 |
| Nelly Property Lettings Ltd | Real estate | 2025 |
| Nemesgeod Limited | Construction | 2025 |
| Neptune Heating & Plumbing Ltd | Construction | 2012 |
| Neptune Heating Limited | Construction | 2025 |
| Neptune Plumbing and Heating Kent LLP | | 2013 |
| Neqis Group Limited | Financial services | 2020 |
| Neqis Limited | Information & communication | 2006 |
| Neral Construction Ltd | Construction | 2026 |
| NEST4FUTURE Ltd | Extraterritorial | 2021 |
| NET Automotive Limited | Wholesale & retail | 2015 |
| NET Income Streams Ltd | Wholesale & retail | 2004 |
| Netbox Digital Ltd | Wholesale & retail | 2006 |
| Netbox Digital Managed IT Services Limited | Information & communication | 2014 |
| Netbox Recruitment Limited | Administrative & support | 2015 |
| Neth Engineering Services Limited | Construction | 2014 |
| Netsky Alarms Ltd | Administrative & support | 2019 |
| Network Wiring Systems Ltd | Information & communication | 2016 |
| Network Yacht Brokers (Kent) Limited | Wholesale & retail | 1986 |
| Neuromotion Limited | Other services | 2024 |
| Never Board Limited | Information & communication | 2016 |
| Never Count Reps Limited | Wholesale & retail | 2025 |
| New AGE Arbitrage Ltd | Wholesale & retail | 2024 |
| New AGE Scaffolding Ltd | Construction | 2023 |
| New City Living Limited | Real estate | 2007 |
| New Hythe Lane (RMC) Limited | Households | 2004 |
| New Planet Films Limited | Information & communication | 2008 |
| New Road Construction Limited | Construction | 2018 |
| New Star Door Controls Limited | Wholesale & retail | 1991 |
| New Volsharn Tandoori Ltd | Hospitality | 2024 |
| Newbuysbytee Ltd | Health & social care | 2024 |
| Newdawnpropertymanagement Limited | Real estate | 2017 |
| Newlen Plant Ltd | Construction | 2020 |
| Newman Family Group Limited | Professional & scientific | 2025 |
| Newman Software Ltd | Professional & scientific | 2008 |
| Newman Testing Services Limited | Professional & scientific | 2008 |
| Newt-Tech Ltd | Real estate | 2021 |
| Nexafortis Global Consulting Limited | Information & communication | 2025 |
| Nexgen Asphalt Limited | Manufacturing | 2025 |
| Nexgen Football Scouting Academy Ltd | Education | 2025 |
| Nexgen Sports (Kent) Ltd | Education | 2025 |
| Next GEN - DBM Ltd | Construction | 2025 |
| Nextone Ltd | Real estate | 2024 |
| Nexus Core Support Ltd | Administrative & support | 2025 |
| Nexus Edge Care Ltd | Real estate | 2024 |
| Nexus Inc Limited | Wholesale & retail | 2025 |
| Nexus Lifts Limited | Manufacturing | 2018 |
| Nexus Management Group Ltd | Professional & scientific | 2024 |
| NGM Investments Ltd | Real estate | 2020 |
| Ngroup UK Limited | Construction | 2008 |
| NH Audit Limited | Professional & scientific | 2023 |
| NH Compliance Ltd | Administrative & support | 2025 |
| NHI Support Services Ltd | Health & social care | 2022 |
| NI Logistics Limited | Transport & logistics | 2017 |
| Niche Flooring Ltd | Construction | 2021 |
| Nicholls Services Limited | Construction | 2004 |
| Nick Groves Ltd | Construction | 2011 |
| Nick Locations Limited | Administrative & support | 2008 |
| Nickir Ltd. | Health & social care | 2014 |
| Nicolaas Joubert Historic Buildings Consultant Limited | Professional & scientific | 2015 |
| Night and Day UK Security Service Ltd | Administrative & support | 2016 |