| N K Autos Limited | Wholesale & retail | 2016 |
| N&G Autobox Ltd | Wholesale & retail | 2024 |
| N&N Transport Solution Ltd | Transport & logistics | 2022 |
| Naandanjain UK Limited | Manufacturing | 2018 |
| Nabcom Limited | Construction | 2014 |
| Nabe Ltd | Construction | 2023 |
| Naden Healthcare Ltd | Health & social care | 2015 |
| Nadine Chiro Limited | Health & social care | 2022 |
| NAH Films Limited | Information & communication | 2016 |
| Nakma Services Ltd | Administrative & support | 2024 |
| Naletale Ltd | Construction | 2022 |
| Naron Graphics Limited | Manufacturing | 2015 |
| Nast Solutions Limited | Health & social care | 2012 |
| NAT4MAX Security Engineering Ltd | Construction | 2014 |
| Nathan B Enterprises Ltd | Wholesale & retail | 2025 |
| National Grit Ltd | Wholesale & retail | 2019 |
| National Union of Foster Carers Ltd | Administrative & support | 2017 |
| National Union of Professional Foster Parents Ltd | Administrative & support | 2017 |
| Nationwide Payroll Company Limited | Administrative & support | 2001 |
| Natnah Innovation Ltd | Real estate | 2019 |
| Natnah Property Management Ltd | Real estate | 2020 |
| Natural Colour Works Products Limited | Other services | 2023 |
| Natural Smiles Limited | Health & social care | 2004 |
| Naturally Gifted Apparel Ltd | Wholesale & retail | 2022 |
| Nautch Limited | Real estate | 2006 |
| Naviglio Ltd | Transport & logistics | 2021 |
| Nawroz Hair Styling Ltd | Other services | 2023 |
| NBS Opco Limited | Real estate | 2012 |
| NCA Auto Total Ltd | Wholesale & retail | 2014 |
| NCH Marketing Limited | Administrative & support | 2022 |
| NCH Marketing Services Limited | Administrative & support | 1996 |
| Ndlovu Enterprises Limited | Financial services | 2024 |
| Ndlt Limited | Wholesale & retail | 2003 |
| NDR Recruitment Ltd | Administrative & support | 2022 |
| NDR Services (UK) Limited | Administrative & support | 2014 |
| NDS Trade Connect Ltd | Wholesale & retail | 2026 |
| Neaversfield Limited | Construction | 1985 |
| Necta & Hive Holding Ltd | Manufacturing | 2018 |
| Needo Services Ltd | Professional & scientific | 2023 |
| Nehanda Motors Limited | Wholesale & retail | 2023 |
| Neil Deadman Builders Limited | Construction | 2011 |
| Neilson Group Limited | Manufacturing | 2020 |
| Nellia Ltd | Administrative & support | 2014 |
| Nellyflo Limited | Professional & scientific | 2014 |
| Nemetrade Ltd | Wholesale & retail | 2026 |
| Nene Capital Limited | Professional & scientific | 2021 |
| NEO Construction and Fabrication Ltd | Construction | 2026 |
| Neptun Ltd | Wholesale & retail | 2019 |
| Neptune Retreat Ltd | Real estate | 2025 |
| Neris Limited | Transport & logistics | 2018 |
| Nerium Services Limited | Professional & scientific | 1999 |
| Neto Construction Ltd | Construction | 2025 |
| Network Medical Services Ltd | Health & social care | 2016 |
| Neveckas Limited | Transport & logistics | 2016 |
| New Anchor Housing and Support Ltd | Health & social care | 2023 |
| New Catering Ltd | Hospitality | 2021 |
| New Chapter Villages Limited | Construction | 2019 |
| New Corby Cafe Limited | Hospitality | 2016 |
| New Dawn Services Ltd | Administrative & support | 2020 |
| New Leicester Trading Ltd | Wholesale & retail | 2025 |
| New Lodge Farm (Bulwick) Limited | Wholesale & retail | 2023 |
| New Lodge Farm Events Limited | Hospitality | 2016 |
| New Realm Online Ltd | Information & communication | 2025 |
| New Season Counselling Services Limited | Health & social care | 2008 |
| Newpath Social Care Ltd | Public administration | 2021 |
| News Plus Local Ltd | Wholesale & retail | 2019 |
| Newton-In-The-Willows Trust | Administrative & support | 2005 |
| Next Level Stone Art Ltd | Construction | 2019 |
| Next Step for Education Ltd | Education | 2026 |
| Nextgenrc Limited | Information & communication | 2026 |
| Nextgenrise CIC | Education | 2026 |
| Nextnextfinish Limited | Information & communication | 2014 |
| Nexvia Logistic Ltd | Transport & logistics | 2026 |
| Nhpm Services Ltd | Construction | 2021 |
| Nick Brickwork Ltd | Construction | 2024 |
| Nick Transport Specialist Ltd | Wholesale & retail | 2025 |
| Nicks Motors Limited | Wholesale & retail | 2001 |
| Nico BSR Quality Ltd | Wholesale & retail | 2024 |
| Niilampt Quality Care Limited | Health & social care | 2024 |
| NIK Engineering UK Ltd | Wholesale & retail | 2026 |
| NIK Haulage Ltd | Transport & logistics | 2025 |
| Niko Genuine Parts Ltd | Wholesale & retail | 2023 |
| Nilan Ltd | Administrative & support | 2009 |
| Nims Transport Ltd | Transport & logistics | 2025 |
| Nina Wainwright PR Limited | Professional & scientific | 2010 |
| Nirvana Elite Cleaning Services Ltd | Administrative & support | 2024 |
| Nissy Limited | Administrative & support | 2023 |
| NJ Legacy Properties Ltd | Hospitality | 2025 |
| NJ Williams Motorsport Limited | Professional & scientific | 2019 |
| NJK Events Limited | Administrative & support | 2025 |
| Njordai Ltd | Information & communication | 2025 |
| NJR Engineering Limited | Administrative & support | 2024 |
| NMU Foods Limited | Wholesale & retail | 2025 |
| NO Knots Therapy Ltd | Public administration | 2024 |
| NO Stress Plastering Limited | Construction | 2024 |
| Noa's Soft Play Ltd | Arts & recreation | 2025 |
| Noblis Limited | Health & social care | 2013 |
| Nolo Investments Ltd | Real estate | 2023 |
| Nonsuch Payroll Service Limited | Professional & scientific | 2007 |
| Noone Properties Corby Limited | Real estate | 2026 |