| Niyah Nest Ltd | Health & social care | 2025 |
| NJ Chinese Takeaway Limited | Hospitality | 2023 |
| NJ Curry Limited | Hospitality | 2024 |
| NJ Dental Services Limited | Health & social care | 2025 |
| NJ Grindrod Studios Ltd | Arts & recreation | 2023 |
| NJ Harrison Consultancy Limited | Health & social care | 2023 |
| NJ Kitchen Ltd | Hospitality | 2023 |
| NJ Risk and Regulatory Consulting Limited | Professional & scientific | 2016 |
| NJB Ecom Limited | Wholesale & retail | 2025 |
| NJB Paving & Landscapes Ltd | Administrative & support | 2025 |
| NJB Property Ltd | Real estate | 2024 |
| NJB Resin Ltd | Administrative & support | 2025 |
| NJC Developments LLP | | 2025 |
| NJM Sports Ltd | Arts & recreation | 2011 |
| NJS Medical Services Ltd | Health & social care | 2025 |
| Njsc Academy Ltd | Education | 2025 |
| NJU Joinery Limited | Construction | 2025 |
| NJW Surfacing Ltd | Construction | 2024 |
| NK Car Sales Ltd | Wholesale & retail | 2012 |
| NK Cellar Ltd | Wholesale & retail | 2020 |
| NK Force Ltd | Construction | 2024 |
| NK Holdings South Yorkshire Ltd | Real estate | 2024 |
| NKA Events Ltd | Administrative & support | 2025 |
| Nkadlane Ltd | Health & social care | 2016 |
| Nkali Ltd. | Extraterritorial | 2023 |
| NKD Advisory Limited | Administrative & support | 2021 |
| NKH Construction Limited | Construction | 2014 |
| NLE Electrical Limited | Manufacturing | 2014 |
| NLG 2022 Limited | Real estate | 2022 |
| NLH Service’S Ltd | Administrative & support | 2020 |
| Nlily Limited | Other services | 2019 |
| Nlivn Ltd | Manufacturing | 2017 |
| NLJ Joinery and Build Limited | Construction | 2024 |
| NM Business Solutions Ltd | Administrative & support | 2025 |
| NM Carpets Ltd | Wholesale & retail | 2011 |
| NM IT Solutions Ltd | Wholesale & retail | 2023 |
| NM Products Limited | Wholesale & retail | 2011 |
| NM Property Management Limited | Real estate | 2004 |
| Nmacharis Limited | Wholesale & retail | 2025 |
| NMC Business Services Ltd | Professional & scientific | 2010 |
| Nmkay Limited | Health & social care | 2025 |
| Nmonic and Co Limited | Financial services | 2024 |
| NMS Care Limited | Health & social care | 2016 |
| NMW Holdings Ltd | Real estate | 2025 |
| NO 1 Healthcare Sheffield Ltd | Health & social care | 2018 |
| NO Capes Limited | Arts & recreation | 2015 |
| NO Ceiling Music Limited | Information & communication | 2025 |
| NO FEE Lets Limited | Real estate | 2014 |
| NO Filter Media Ltd | Professional & scientific | 2020 |
| NO IFS NO Buts Limited | Construction | 2009 |
| NO Lemons Trading Ltd | Wholesale & retail | 2020 |
| NO Limit Burger Ltd | Hospitality | 2019 |
| NO Mild Steel Limited | Other services | 2023 |
| NO More Superheroes. Limited | Education | 2025 |
| NO Music Limited | Information & communication | 2014 |
| NO Plans Studio Ltd | Information & communication | 2016 |
| NO Pressure L & a Limited | Agriculture & fishing | 2023 |
| NO Quarter | Financial services | 2022 |
| NO Windows HQ Limited | Information & communication | 2024 |
| NO Xcuse Limited | Arts & recreation | 2004 |
| NO. 98 Redcliffe Gardens Freehold Management Co. Limited | Real estate | 1997 |
| NO4 Hospitality Ltd | Hospitality | 2020 |
| NOA A2B Limited | Wholesale & retail | 2018 |
| Noah Driving School Ltd | Transport & logistics | 2023 |
| Noah Sinnott Limited | Information & communication | 2026 |
| Noah Taxi Ltd | Transport & logistics | 2023 |
| Noakes Farm Properties Limited | Agriculture & fishing | 1960 |
| Nobis Enterprise Limited | Professional & scientific | 2025 |
| Noble Alloys Ltd | Wholesale & retail | 2023 |
| Noble and Wylie Ltd | Manufacturing | 2022 |
| Noble Tracks Limited | Administrative & support | 2025 |
| Noble-Jones Hospitality Limited | Hospitality | 2022 |
| Nobles Care Services Ltd | Health & social care | 2025 |
| Nobody Records Limited | Arts & recreation | 2021 |
| Nocn | Education | 1999 |
| Nocn JOB Cards | Education | 2018 |
| Nodes Consulting Ltd | Professional & scientific | 2025 |
| Noel Bidco Limited | Financial services | 2017 |
| Noel Cleanco Limited | Financial services | 2017 |
| Noel Midco Limited | Financial services | 2017 |
| Noel Topco Limited | Financial services | 2017 |
| Noggin Analytics UK Ltd | Professional & scientific | 2022 |
| Noir & Co Barbers Ltd | Other services | 2023 |
| Noise Comms Limited | Information & communication | 2016 |
| Noise Creative Marketing & Communication Limited | Professional & scientific | 2011 |
| NOK Essentials Limited | Wholesale & retail | 2024 |
| Noknok Corporate LET Ltd | Real estate | 2020 |
| Nola Rubicon Limited | Real estate | 2015 |
| Nolagrey Ltd | Wholesale & retail | 2023 |
| Nolan Homes Ltd | Real estate | 2024 |
| Nolauk Ltd | Wholesale & retail | 2020 |
| Nomad & King Limited | Manufacturing | 2017 |
| Nomad Fencing Supplies Limited | Construction | 2023 |
| Nomad Maison Ltd | Wholesale & retail | 2024 |
| Nomad Opening Doors | Hospitality | 1999 |
| Nomad Opening Doors Trading Ltd | Real estate | 2018 |
| Nomad's CUP Ltd | Hospitality | 2025 |
| Nomad.Org.Uk Ltd | Information & communication | 2009 |
| NOMAD48 Ltd | Professional & scientific | 2024 |
| Nomas Sports Limited | Wholesale & retail | 2021 |