| THE Mortgage Lady Limited | Financial services | 2020 |
| THE Mosaic Restoration Company Limited | Construction | 1998 |
| THE Most Group Ltd | Administrative & support | 2023 |
| THE Most Sensible Way to Buy Heating OIL (2020) Limited | Wholesale & retail | 2019 |
| THE Most Sensible Way to Buy Heating OIL Limited | Wholesale & retail | 2002 |
| THE Motorhome Lounge Ltd | Professional & scientific | 2026 |
| THE Mower Shop (Northampton) Limited | Manufacturing | 2009 |
| THE MUM Club Ltd | Information & communication | 2016 |
| THE Museum Court Management Company Limited | Households | 2002 |
| THE Myadarcy Collective Limited | Administrative & support | 2025 |
| THE Nail LAB Academy Ltd | Other services | 2024 |
| THE Nannery Limited | Health & social care | 2005 |
| THE National Hockey Foundation | Arts & recreation | 1992 |
| THE Natural Aesthetics Clinic Ltd | Health & social care | 2023 |
| THE Naturally Vegan Food Company Limited | Manufacturing | 2016 |
| THE Neighbourhood NN1 Ltd | Other services | 2023 |
| THE Networking Store Limited | Wholesale & retail | 2010 |
| THE New Smooth Operator Limited | Other services | 2006 |
| THE New Tasty Box Limited | Hospitality | 2024 |
| THE New Zealand House of Wine Limited | Wholesale & retail | 2003 |
| THE Northampton Business Park Management Limited | Real estate | 1989 |
| THE Northampton Charcuterie Company Ltd | Manufacturing | 2021 |
| THE Northampton Cheese Company Ltd | Manufacturing | 2021 |
| THE Northampton Diocesan Priests' Fund | Other services | 2004 |
| THE Northampton Musical Theatre Company Ltd | Arts & recreation | 2011 |
| THE Northampton Retail Crime Initiative | Information & communication | 2003 |
| THE Northampton Theatres Trust Limited | Arts & recreation | 1998 |
| THE Northamptonshire Caterer Limited | Hospitality | 2023 |
| THE Northamptonshire County Federation of Women's Institutes | Other services | 1992 |
| THE Northern Line Windermere Limited | Wholesale & retail | 2016 |
| THE Northstar Cafe Ltd | Hospitality | 2025 |
| THE NSB Trust | Education | 2010 |
| THE O Group Limited | Financial services | 2025 |
| THE Oak Naseby Ltd | Hospitality | 2026 |
| THE Oakley Catering Co Ltd | Hospitality | 2025 |
| THE Oaks (Moulton) Management Company Limited | Households | 2024 |
| THE Octagon Clinic Limited | Health & social care | 2002 |
| THE Office Genie Limited | Administrative & support | 2005 |
| THE Office of Leon Richards Ltd | Information & communication | 2020 |
| THE Office of the Family House Munro LLP | | 2025 |
| THE Offsite Construction Show Limited | Administrative & support | 2015 |
| THE Old Baths Northampton RTM Company Limited | Real estate | 2012 |
| THE Old Dairy Pilates Studio Ltd | Arts & recreation | 2023 |
| THE Old Northamptonians Association Limited | Arts & recreation | 2008 |
| THE Old Pearl of Northants Ltd | Hospitality | 2026 |
| THE Old Savoy Community Interest Company | Arts & recreation | 2020 |
| THE Old School House (Welford Road) Limited | Households | 2011 |
| THE OLE Shop Limited | Extraterritorial | 2025 |
| THE Olive JAR Ltd | Hospitality | 2021 |
| THE Opportunity Group Ltd | Professional & scientific | 2016 |
| THE Opus Partnership LLP | | 2004 |
| THE Organised Office Company Limited | Administrative & support | 2026 |
| THE Original Drapers Ltd | Professional & scientific | 2023 |
| THE Original GC Ltd | Arts & recreation | 2025 |
| THE Outdoor Chapter Ltd | Construction | 2025 |
| THE Outdoor Club CIC | Education | 2022 |
| THE Outdoor Learning Group Ltd | Education | 2025 |
| THE Outlook Creative Group (2017) Limited | Administrative & support | 2017 |
| THE Outlook Creative Group (2023) Ltd | Administrative & support | 2023 |
| THE Outlook Creative Group (2024) Ltd | Administrative & support | 2024 |
| THE Outlook Creative Group Ltd | Administrative & support | 1998 |
| THE Overs Management Company Limited | Households | 2007 |
| THE Overton Red Lion Limited | Hospitality | 2019 |
| THE P & S Property Development (Northampton)Company Ltd | Professional & scientific | 2005 |
| THE P Houseing Team Ltd | Administrative & support | 2026 |
| THE Paddocks (Welford) Development Limited | Administrative & support | 1999 |
| THE Padel Referee & Co Ltd. | Other services | 1996 |
| THE Parcel Store Ltd | Transport & logistics | 2018 |
| THE Park Café Abington Limited | Hospitality | 2019 |
| THE Partnership Healthcare Group Limited | Health & social care | 2016 |
| THE Partridge PUB Company Ltd | Hospitality | 2019 |
| THE Parts Hangar Ltd | Wholesale & retail | 2022 |
| THE People Experience Hub Limited | Professional & scientific | 2018 |
| THE Perfect Country PUB Company Ltd | Hospitality | 2015 |
| THE Perfect Nursery Company Ltd | Wholesale & retail | 2024 |
| THE Perisoss Partnership | | 1994 |
| THE Phoenix Day Nursery Limited | Education | 2001 |
| THE Physical Therapy Clinic Limited | Health & social care | 2006 |
| THE Pines Flats Management (Wellingborough) Limited | Households | 2006 |
| THE Pink Frog Northampton Limited | Professional & scientific | 2023 |
| THE Plant Barn Limited | Wholesale & retail | 2023 |
| THE Plant-Based POD Ltd | Hospitality | 2019 |
| THE Play Cafe NN Limited | Hospitality | 2022 |
| THE Play Garden Cafe Ltd | Hospitality | 2023 |
| THE Plaza RTM Company Ltd | Households | 2022 |
| THE Plaza Two RTM Company Limited | Households | 2024 |
| THE Pomfret Arms Limited | Hospitality | 2016 |
| THE Portus Group Ltd | Real estate | 2018 |
| THE Pretty Smart Food Co Ltd | Manufacturing | 2014 |
| THE Print Store Ltd | Administrative & support | 1999 |
| THE Print Works Building Management Company Limited | Households | 2003 |
| THE Printsite Limited | Manufacturing | 2008 |
| THE Printwear Company Ltd | Manufacturing | 2021 |
| THE Private Physiotherapy Educational Foundation | Education | 1991 |
| THE Product Box Ltd | Manufacturing | 2023 |
| THE Professional Bowls Corporation Limited | Arts & recreation | 2019 |
| THE Promotions Group Ltd. | Professional & scientific | 2015 |
| THE Property Corridor Holdings Ltd | Financial services | 2025 |
| THE Property Finders Ltd | Administrative & support | 2002 |
| THE Property Fold Limited | Real estate | 2023 |