| Northampton GP and Community Alliance LLP | | 2018 |
| Northampton Grocery Ltd | Wholesale & retail | 2026 |
| Northampton Gymnastics Academy Ltd | Health & social care | 2015 |
| Northampton H2O Limited | Construction | 2010 |
| Northampton Hockey Club | Arts & recreation | 2023 |
| Northampton Home Letting Ltd | Other services | 2018 |
| Northampton Hope Centre | Health & social care | 1992 |
| Northampton Independent Mortgage Brokers Ltd | Financial services | 2003 |
| Northampton Inspirations Limited | Real estate | 2019 |
| Northampton Judo Academy Ltd | Arts & recreation | 2023 |
| Northampton Kenyan Community Interest Company | Health & social care | 2020 |
| Northampton Kitchen & Bathroom Specialists Ltd | Extraterritorial | 2016 |
| Northampton Lakes 2 Management Company Limited | Real estate | 2005 |
| Northampton Laser Clinic Limited | Health & social care | 2020 |
| Northampton Limited | Health & social care | 2022 |
| Northampton Line Markings Limited | Construction | 2001 |
| Northampton Living Ltd | Real estate | 2013 |
| Northampton Marketing Ltd | Information & communication | 2003 |
| Northampton Medical Services Ltd | Health & social care | 1997 |
| Northampton Mens Own Rugby Football Club Limited | Arts & recreation | 2013 |
| Northampton Motor Cyclists Club Limited | Administrative & support | 1979 |
| Northampton Motorsport Limited | Wholesale & retail | 2000 |
| Northampton Mower MAN Limited | Administrative & support | 2022 |
| Northampton Netball Limited | Arts & recreation | 2022 |
| Northampton Off-Grid Farm Ltd | Agriculture & fishing | 2017 |
| Northampton Old Scouts Rugby Club Limited | Arts & recreation | 2008 |
| Northampton Osteopaths Limited | Health & social care | 2026 |
| Northampton Outlaws RFC Ltd | Arts & recreation | 2014 |
| Northampton Padel Ltd | Arts & recreation | 2025 |
| Northampton Plumbing & Heating Limited | Extraterritorial | 2016 |
| Northampton Primary Academy Trust | Education | 2012 |
| Northampton Properties Ltd | Real estate | 2024 |
| Northampton Property Solutions Ltd | Real estate | 2024 |
| Northampton Psychology Limited | Health & social care | 2017 |
| Northampton RAW Dog Food Limited | Wholesale & retail | 2018 |
| Northampton Recruitment Ltd | Administrative & support | 2024 |
| Northampton Removal and Logistics Ltd | Wholesale & retail | 2009 |
| Northampton Restaurant Ltd | Hospitality | 2024 |
| Northampton Road Markings Ltd | Construction | 2018 |
| Northampton Roman Catholic Diocese Trustee(The) | Other services | 1947 |
| Northampton Roofing Solutions Limited | Construction | 2011 |
| Northampton Rugby Football Club Limited | Arts & recreation | 1995 |
| Northampton Saints Foundation | Administrative & support | 2017 |
| Northampton Saints Foundation Trading Limited | Arts & recreation | 2022 |
| Northampton Saints PLC | Arts & recreation | 2000 |
| Northampton School for Boys Charitable Trust Limited | Education | 1994 |
| Northampton School for Girls | Education | 2013 |
| Northampton Science Park Limited | Real estate | 2004 |
| Northampton Security Fencing Ltd | Construction | 2010 |
| Northampton SET UP Limited | Wholesale & retail | 2025 |
| Northampton Spice Ltd | Hospitality | 2024 |
| Northampton Sports Therapy Ltd | Health & social care | 2024 |
| Northampton Steam Railway Limited | Transport & logistics | 1985 |
| Northampton Stonemasons Ltd | Manufacturing | 2019 |
| Northampton Students’ Union | Other services | 2024 |
| Northampton Surface Treatments Ltd | Manufacturing | 2026 |
| Northampton Surgical Ltd | Health & social care | 2025 |
| Northampton Swimming Club | Arts & recreation | 2008 |
| Northampton Taxi Hire Limited | Transport & logistics | 2023 |
| Northampton Taxis Ltd | Transport & logistics | 2021 |
| Northampton Theatres Enterprises Limited | Hospitality | 2015 |
| Northampton Therapy Rooms Ltd | Education | 2026 |
| Northampton Town Centre Ltd | Other services | 2010 |
| Northampton Town Football Club Limited(The) | Arts & recreation | 1922 |
| Northampton Town Football Club Women Limited | Arts & recreation | 2025 |
| Northampton Town of Sanctuary Ltd | Other services | 2023 |
| Northampton Town Offices Ltd | Real estate | 2022 |
| Northampton Town Ventures Limited | Arts & recreation | 2015 |
| Northampton Travel Services Limited | Administrative & support | 1972 |
| Northampton Urology Care Limited | Health & social care | 2019 |
| Northampton Van Centre Limited | Wholesale & retail | 2010 |
| Northampton VB Ltd | Wholesale & retail | 2020 |
| Northampton Vehicle Body Repairs Ltd | Wholesale & retail | 2018 |
| Northampton Vehicle Recovery Ltd | Transport & logistics | 2026 |
| Northampton VIP Ltd | Information & communication | 2016 |
| Northampton WAR Book Publishing Limited | Information & communication | 2014 |
| Northampton Welding Ltd | Wholesale & retail | 2018 |
| Northampton Wheel Refurbishment Ltd | Wholesale & retail | 2026 |
| Northampton Window Cleaning Ltd | Administrative & support | 2016 |
| Northampton Wine Importers Limited | | 1989 |
| Northamptonshire Acre | Other services | 2000 |
| Northamptonshire Arts Management Trust | Administrative & support | 2010 |
| Northamptonshire Association of Youth Clubs | Arts & recreation | 1990 |
| Northamptonshire Black History Association | Education | 2005 |
| Northamptonshire Business Crime Partnership Limited | Information & communication | 2015 |
| Northamptonshire Chamber of Commerce | Other services | 2000 |
| Northamptonshire Children's Trust Limited | Public administration | 2020 |
| Northamptonshire Choral Foundation Limited | Arts & recreation | 1992 |
| Northamptonshire Community Foundation | Other services | 2001 |
| Northamptonshire Construction Training Group Limited | Other services | 2003 |
| Northamptonshire County Cricket Club Limited | Arts & recreation | 2007 |
| Northamptonshire Dental Suite Ltd | Health & social care | 2024 |
| Northamptonshire Elite Cleaning Ltd | Administrative & support | 2025 |
| Northamptonshire Fencing Supplies Ltd | Administrative & support | 2022 |
| Northamptonshire Fire Protection | | 2000 |
| Northamptonshire Food Services Ltd | Wholesale & retail | 2016 |
| Northamptonshire Football Association Limited | Arts & recreation | 1999 |
| Northamptonshire Gardens Trust | Other services | 1994 |
| Northamptonshire Independent Grammar School Charity Trust Limited | Education | 1988 |
| Northamptonshire Industrial Pipeworks Ltd | Construction | 2019 |