| NOP Trans Limited | Transport & logistics | 2024 |
| Norban Estates Limited | Real estate | 1954 |
| Norborough House Management Company Limited | Real estate | 2018 |
| Nordiva Home Ltd | Wholesale & retail | 2025 |
| Norfield Ltd | Real estate | 2022 |
| Norfolk Feather Company Limited | Manufacturing | 1993 |
| Norfolk Lodge School Limited | Education | 2002 |
| Noris Tyres Kettering Ltd | Wholesale & retail | 2025 |
| Noris Tyres Limited | Wholesale & retail | 2024 |
| Norland Place (Flat 1) Limited | Real estate | 2023 |
| Norm Entertainment Limited | Arts & recreation | 2023 |
| Norma Export Ltd | Wholesale & retail | 2019 |
| Norman & Underwood Conservation Limited | Construction | 1974 |
| Norman & Underwood Group Limited | Professional & scientific | 1967 |
| Norman 2039 Limited | Financial services | 2023 |
| Norman and Underwood Limited | Construction | 1929 |
| Norman's Investments Limited | Real estate | 2022 |
| Normar Civils Ltd | Construction | 2022 |
| Norpak Leather Co. Limited | Wholesale & retail | 1961 |
| Norridge Homes 10 Limited | Real estate | 2017 |
| Norridge Homes 11 Ltd | Real estate | 2018 |
| Norridge Homes 12 Ltd | Real estate | 2018 |
| Norridge Homes 13 Ltd | Real estate | 2020 |
| Norridge Homes 15 Limited | Real estate | 2018 |
| Norridge Homes 20 Ltd | Real estate | 2021 |
| Norridge Homes 25 Ltd | Real estate | 2024 |
| Norse Building & Civils Limited | Construction | 2019 |
| Norse Contracts Ltd | Administrative & support | 2023 |
| Norse Modular Ltd | Construction | 2021 |
| Norse Recruitment Limited | Administrative & support | 2012 |
| Norsedynamic Ltd | Professional & scientific | 2017 |
| Nortech Network Services Limited | Professional & scientific | 2000 |
| North Audley Ltd | Real estate | 2021 |
| North Car Repairs Limited | Other services | 2017 |
| North Cooked Foods Ltd | Wholesale & retail | 2026 |
| North Equity Ltd | Real estate | 2020 |
| North Fashion London Ltd | Wholesale & retail | 2025 |
| North Hampton Ltd | Wholesale & retail | 2021 |
| North House Holdings Limited | Real estate | 2017 |
| North Northamptonshire Home Care Ltd | Education | 2020 |
| North Oxford Garage Limited | Wholesale & retail | 1945 |
| North Sea Shipping Company Limited | Extraterritorial | 2008 |
| North South Homes Limited | Construction | 2023 |
| North South India Food Limited | Hospitality | 2024 |
| North South Renovations Ltd | Construction | 2019 |
| North Star (Cambridge) Limited | Hospitality | 2026 |
| North Traders Ltd | Wholesale & retail | 2019 |
| North-Edge Assets Ltd | Real estate | 2017 |
| NORTH27 Limited | Information & communication | 2013 |
| Northall Estates Limited | Administrative & support | 2004 |
| Northam Fried & Grill Ltd | Hospitality | 2025 |
| Northampton Abington Community Association | Other services | 2013 |
| Northampton Afro-Caribbean Organisation | Administrative & support | 1998 |
| Northampton Aksoy Limited | Other services | 2017 |
| Northampton Amateur Boxing Club Ltd | Arts & recreation | 2015 |
| Northampton ANP Direct Ltd | Health & social care | 2022 |
| Northampton Apple Repair Ltd | Other services | 2016 |
| Northampton Arts Collective Limited | Arts & recreation | 2009 |
| Northampton Association for Accommodation for Single Homeless | Health & social care | 2000 |
| Northampton Bangladeshi Business Chamber CIC | Administrative & support | 2026 |
| Northampton Barbers Ltd | Other services | 2019 |
| Northampton Bathrooms Limited | Construction | 2020 |
| Northampton Best Food Ltd | Hospitality | 2024 |
| Northampton Billiards and Snooker Company Limited | Arts & recreation | 2016 |
| Northampton Boys' Brigade Old Boys Rugby Football Club Limited | Arts & recreation | 2010 |
| Northampton Brickwork Ltd | Construction | 2025 |
| Northampton Builders Limited | Construction | 2013 |
| Northampton Building Services Limited | Construction | 2003 |
| Northampton Business Phoenix Limited | Professional & scientific | 2015 |
| Northampton Business School Ltd | Education | 2023 |
| Northampton Buy 2 LET Limited | Real estate | 2024 |
| Northampton Car Services Ltd | Wholesale & retail | 2020 |
| Northampton Carnival and Cultural Arts Ltd | Arts & recreation | 2022 |
| Northampton Cars Limited | Transport & logistics | 2010 |
| Northampton Casuals Rugby Football & Social Club Limited | Arts & recreation | 2025 |
| Northampton Catering Equipment Ltd | Wholesale & retail | 2022 |
| Northampton Christian Centres Limited | Wholesale & retail | 1983 |
| Northampton Civils Ltd | Construction | 2019 |
| Northampton Cleaning Equipment Limited | | 1986 |
| Northampton Community Radio Ltd | Information & communication | 2025 |
| Northampton Computers Limited | Information & communication | 1988 |
| Northampton Counselling Centre Limited | Health & social care | 2013 |
| Northampton County Cars Ltd | Transport & logistics | 2019 |
| Northampton County Lawn Tennis Club Limited | Arts & recreation | 1932 |
| Northampton DAB Community Interest Company | Information & communication | 2022 |
| Northampton Demolition Limited | Construction | 2016 |
| Northampton Diesel Injector Services Limited | Manufacturing | 1977 |
| Northampton EAR Clinic Limited | Health & social care | 2017 |
| Northampton Electrical Ltd | Construction | 2024 |
| Northampton Electrical Services Ltd | Construction | 2006 |
| Northampton Electricians Ltd | Construction | 2024 |
| Northampton Enterprise Limited | Real estate | 2014 |
| Northampton Esco CIC | Other services | 2016 |
| Northampton Fast Food Ltd | Hospitality | 2019 |
| Northampton Food and Drink Ltd | Wholesale & retail | 2026 |
| Northampton Friends Play Limited | Manufacturing | 2018 |
| Northampton Garage Limited | Wholesale & retail | 2022 |
| Northampton Glass Limited | Extraterritorial | 1999 |
| Northampton Golf Club (Harlestone Park) Limited | Arts & recreation | 2020 |
| Northampton Golf Club Company Limited(The) | Construction | 1922 |