| P&Ac Transport Ltd | Transport & logistics | 2020 |
| P&B Sails Limited | Manufacturing | 2026 |
| P&Bcotrans Limited | Transport & logistics | 2023 |
| P&D Specialist Services Trustees Limited | Administrative & support | 2018 |
| P&D Total Ltd | Construction | 2019 |
| P&E Cummings Investments Limited | Financial services | 2020 |
| P&G Family Limited | Real estate | 2023 |
| P&H Construction Group Ltd | Construction | 2025 |
| P&H Juniors Services Limited | Health & social care | 2017 |
| P&I Transport Ltd | Transport & logistics | 2022 |
| P&J Express Limited | Transport & logistics | 2025 |
| P&L Building Services Ltd | Construction | 2023 |
| P&L Roofing and Cladding Services Ltd | Construction | 2026 |
| P&M Atelier Ltd | Real estate | 2026 |
| P&M Glazing Limited | Administrative & support | 2014 |
| P&M&A Ltd | Transport & logistics | 2017 |
| P&S Investment Properties Limited | Real estate | 2025 |
| P&S Plant Holdings Limited | Administrative & support | 2022 |
| P-Jayz Catering Services Limited | Hospitality | 2020 |
| P. Carpenter Ltd | Administrative & support | 2023 |
| P. David Ceramics UK Limited | Wholesale & retail | 2017 |
| P. Gerratt Limited | Manufacturing | 1964 |
| P.A.S.S Consultancy Limited | Wholesale & retail | 2014 |
| P.B.S Wholesale Ltd | Wholesale & retail | 2017 |
| P.E,Kelsall Properties Limited | Real estate | 2024 |
| P.J. Savage Limited | Professional & scientific | 1995 |
| P.Mu Paulina Mucha Ltd | Education | 2024 |
| P.O.C. Management Ltd | Administrative & support | 2007 |
| P.O.S Accounting Ltd | Professional & scientific | 2025 |
| P.O.S Property Investment Ltd | Real estate | 2025 |
| P.S.Pol Ltd | Transport & logistics | 2022 |
| P.T. Higgins Building & Construction Ltd | Construction | 2022 |
| P31 Carpentry Limited | Construction | 2021 |
| P5 Developments Ltd | Construction | 2019 |
| PA Birch Consulting Limited | Information & communication | 2024 |
| PA Metalcraft Limited | Manufacturing | 2019 |
| PA Transport Ltd | Transport & logistics | 2021 |
| Paase Digital Limited | Information & communication | 2019 |
| PAB Staffing Solutions Ltd | Construction | 2025 |
| PAC Design Limited | Professional & scientific | 2009 |
| PAC Trans Logistik Limited | Transport & logistics | 2012 |
| Pacepure Ltd | Manufacturing | 2024 |
| Pacesetter Sports & Wellbeing Limited | Arts & recreation | 2010 |
| Pacey Placements (Northampton) Limited | Professional & scientific | 2012 |
| Pacey Print Limited | Manufacturing | 2017 |
| Pacis Care Group Ltd | Health & social care | 2025 |
| Pack Brand Services UK Ltd | Financial services | 2026 |
| Packet Boat Lane Ltd. | Real estate | 2015 |
| Packmap Ltd | Wholesale & retail | 2025 |
| Paco Shipping Limited | Transport & logistics | 2010 |
| Paco Tapas Limited | Hospitality | 2014 |
| Padbury Group Limited | Agriculture & fishing | 2006 |
| Paddock Hill Automotive Limited | Arts & recreation | 2017 |
| Paddock Mobiles Ltd | Wholesale & retail | 2021 |
| Padel Power Northants Limited | Arts & recreation | 2025 |
| Padington Business Finance Limited | Financial services | 2024 |
| Padmavita Limited | Wholesale & retail | 2026 |
| Paf&M Ltd | Transport & logistics | 2022 |
| Page & Belton Limited | Wholesale & retail | 2006 |
| Page Wornum Limited | Administrative & support | 2023 |
| Pager Call Systems Limited | Administrative & support | 2008 |
| Paggo Transport Ltd | Other services | 2018 |
| Pagnell Close Limited | Administrative & support | 2019 |
| Paguda Carpentry and Spray Ltd | Construction | 2021 |
| Paice Financial Planning Ltd | Financial services | 2017 |
| Paintcraft Limited | Wholesale & retail | 1981 |
| Painting HD 4K Limited | Construction | 2025 |
| Painting POT Ltd | Construction | 2024 |
| Pairs Holdings Limited | Financial services | 2015 |
| Paje Ventures Ltd | Real estate | 2020 |
| Pajero Cuisine Catering Services Ltd | Hospitality | 2024 |
| Pakstar Trading Ltd | Wholesale & retail | 2024 |
| PAL 77 Ltd | Transport & logistics | 2018 |
| Palace Gate RTM Company Limited | Households | 2023 |
| Palace Restaurant & Bar Ltd | Hospitality | 2014 |
| Paladin Heritage Limited | Manufacturing | 2015 |
| Palatial Limited | Real estate | 2021 |
| Paley Scaffolding Ltd | Construction | 2024 |
| Pall Investments Ltd | Real estate | 2013 |
| Palleon Ltd | Administrative & support | 2017 |
| Palm Production 2025 Ltd | Arts & recreation | 2025 |
| Palm Surveying Ltd | Professional & scientific | 2026 |
| Palmer Energy Technology Holdings Limited | Other services | 2024 |
| Palmer Energy Technology Limited | Other services | 2024 |
| Palmerston Court (Northampton) Freehold Limited | Real estate | 2019 |
| Palmerston Court (Northampton) Residents Association Limited | Households | 1986 |
| Paloci Construction Ltd | Construction | 2020 |
| Pamipada Ltd | Transport & logistics | 2014 |
| Pamis Care Limited | Health & social care | 2022 |
| Pamper My Poochie Ltd | Other services | 2017 |
| Pamukkale Cocktail Bar Limited | Hospitality | 2025 |
| Pamzinda Northants Meeting Place CIC | Hospitality | 2024 |
| Panaash Ltd | Professional & scientific | 2016 |
| Panda White Ltd | Wholesale & retail | 2025 |
| Pandaw Cruises Ltd | Transport & logistics | 2003 |
| Pandem Holdings Limited | Professional & scientific | 2016 |
| Pandjgarnham Ltd | Real estate | 2022 |
| Pandloss Developments Limited | Extraterritorial | 2000 |
| Panelform Limited | Manufacturing | 2013 |
| Pangah Limited | Public administration | 2024 |