| Pastures Community | Hospitality | 2012 |
| PAT Avenue (UK) Ltd | Wholesale & retail | 1989 |
| Patclems Ltd | Health & social care | 2021 |
| Patel & Daya Ltd | Wholesale & retail | 2025 |
| Path Dependence Limited | Information & communication | 2017 |
| Pathfinder Projects Limited | Extraterritorial | 2017 |
| Pathgold Limited | Wholesale & retail | 1996 |
| Pathright Associates Limited | Information & communication | 1994 |
| Pathway 54 Ltd | Public administration | 2022 |
| Pathway Social Care Consultancy Ltd | Other services | 2020 |
| Pathways to Action CIC | Education | 2026 |
| Patitos Transport Ltd | Transport & logistics | 2022 |
| Paton Precision Engineering Limited | Professional & scientific | 1996 |
| Patra Selections Limited | Wholesale & retail | 1965 |
| Patrician Milton Keynes Limited | Wholesale & retail | 2004 |
| Patrick Landscape and Gardening Ltd | Construction | 2024 |
| Patrick&Dm Ltd | Transport & logistics | 2023 |
| Patron PUB Co Limited | Hospitality | 2026 |
| Patryk Starowicz Ltd | Information & communication | 2026 |
| Patterson Elliott Management Limited | Professional & scientific | 2016 |
| Patve Ltd | Transport & logistics | 2026 |
| Paul B Construction Ltd | Construction | 2016 |
| Paul Benson Limited | Transport & logistics | 2022 |
| Paul Blake Limited | Transport & logistics | 2004 |
| Paul Brickwork Ltd | Construction | 2024 |
| Paul Building Services Limited | Construction | 2013 |
| Paul COX Panel & Paint Limited | Wholesale & retail | 2002 |
| Paul Djuric Consulting Limited | Professional & scientific | 2026 |
| Paul Forna Ltd | Transport & logistics | 2016 |
| Paul Gedney Limited | Financial services | 2009 |
| Paul J Brownsword Consulting Limited | Professional & scientific | 2020 |
| Paul Joseph Smith Limited | Information & communication | 2014 |
| Paul Logistics Transport Ltd | Transport & logistics | 2022 |
| Paul Smith Build & Developments Ltd | Construction | 2021 |
| Paul Smith Developments Limited | Construction | 2001 |
| Paul Sunnucks Limited | Information & communication | 2013 |
| Paul Trucker Limited | Administrative & support | 2024 |
| Paulina Consultancy Ltd | Professional & scientific | 2025 |
| Paulina Krzysztofinska Childminder Ltd | Health & social care | 2026 |
| Pauls Electrical Services Ltd | Construction | 2024 |
| Pavan Trading Ltd | Wholesale & retail | 2010 |
| Pavel Smirnov Ltd | Transport & logistics | 2024 |
| Paverprint (Northants) Limited | Wholesale & retail | 2000 |
| Paveway Ltd | Construction | 2025 |
| Pavia Afea Ltd | Information & communication | 2025 |
| Pavilion Court Management Company (Northampton) Limited | Households | 2005 |
| Pavillion GP Camping Ltd | Hospitality | 2023 |
| Pawa Components Ltd | Wholesale & retail | 2013 |
| Pawfully Good Ltd | Wholesale & retail | 2025 |
| Paws for Peaceful Minds Mental Health Assistance Dogs Limited | Health & social care | 2025 |
| Pawz on the Move Ltd | Other services | 2025 |
| PAX Services Ltd | Construction | 2018 |
| Paxcs Ltd | Professional & scientific | 2011 |
| Paybody Farms (Maidwell) Ltd | Agriculture & fishing | 2013 |
| Paybook Ltd | Professional & scientific | 2014 |
| Paybright Limited | Administrative & support | 2013 |
| Paycuity Ltd | Administrative & support | 2009 |
| Payefficient Ltd | Administrative & support | 2020 |
| Paying TOO Much Holidays Limited | Other services | 2017 |
| Payll Developments Limited | Construction | 1976 |
| Paymazz Ltd | Financial services | 2023 |
| Payne House Limited | Administrative & support | 2016 |
| Paytech Solutions Limited | Administrative & support | 2012 |
| PB Cotrans Limited | Transport & logistics | 2020 |
| PB Garage Limited | Wholesale & retail | 2020 |
| PB Paula Beauty Academy&Aesthetic Clinic Ltd | Other services | 2019 |
| PB Unique Beauty Ltd | Other services | 2023 |
| PB Unique Ltd | Manufacturing | 2021 |
| PBB Trading Ltd | Construction | 2019 |
| PBB1 Ltd | Hospitality | 2020 |
| PBC (Holdings) Limited | Financial services | 2013 |
| PBC Business Recovery and Insolvency Limited | Professional & scientific | 1999 |
| Pbcec Ltd | Professional & scientific | 2025 |
| Pbcs Ltd | Information & communication | 2002 |
| PBD Carpentry Ltd | Manufacturing | 2022 |
| PBF Drainage Services Ltd | Water & waste | 2012 |
| Pbkc Enterprises Ltd | Wholesale & retail | 2023 |
| Pbrand Consulting Services Ltd | Information & communication | 2023 |
| Pbrd Property Management and Lettings Limited | Real estate | 2017 |
| PBS Transport Solutions Ltd | Transport & logistics | 2026 |
| PC & GC Associates Limited | Construction | 2012 |
| PCB Electrical Services Ltd | Construction | 2006 |
| Pcia Limited | Financial services | 2016 |
| PCN Services Ltd | Administrative & support | 2021 |
| Pcsm Ltd | Administrative & support | 2019 |
| PD Construct Limited | Construction | 2025 |
| PD Construct Solutions Limited | Construction | 2015 |
| PD Freight Limited | Transport & logistics | 2017 |
| PD Interiors DRY Lining Ltd | Construction | 2018 |
| PD Knight Property Maintenance Limited | Construction | 2023 |
| PD Sandwiches Limited | Administrative & support | 2012 |
| PD Taverns Ltd | Hospitality | 2006 |
| Pdainty Limited | Construction | 2019 |
| PDD Empire Ltd | Construction | 2025 |
| PDD Spedition Limited | Transport & logistics | 2019 |
| PDG Nurseries Limited | Administrative & support | 2013 |
| PDG Trading & Services Ltd Limited | Wholesale & retail | 2025 |
| PDH Carpentry Ltd | Manufacturing | 2026 |
| Pdld Professional Services Ltd | Information & communication | 2017 |
| PDR Car Repair Ltd | Wholesale & retail | 2024 |