| Pinewood Stays Limited | Real estate | 2025 |
| Ping Security Limited | Construction | 2019 |
| Pingall Transport Limited | Transport & logistics | 2021 |
| Pinji Healthcare Ltd | Health & social care | 2019 |
| Pink Chocolate Hair Boutique Limited | Other services | 2015 |
| Pink Ladies Health & Fitness (Northampton) Ltd | Other services | 2014 |
| Pink Lemon Productions Ltd | Arts & recreation | 2025 |
| Pink Shop Ltd | Wholesale & retail | 2026 |
| Pinnacle Challenge Group Limited | Arts & recreation | 2024 |
| Pinnacle Challenge Limited | Arts & recreation | 2004 |
| Pinnacle Creative Design Ltd | Professional & scientific | 2013 |
| Pinnacle Drive Sure Limited | Transport & logistics | 2025 |
| Pinnacle Life Limited | Financial services | 2019 |
| Pinnaclemeds Trinity Centre Limited | Health & social care | 2024 |
| Pinnaka IT Solutions Ltd | Information & communication | 2019 |
| Pinnell & BAX Limited | Manufacturing | 1997 |
| Pinotage Property Limited | Households | 1993 |
| Pinstripes Limited | Other services | 2008 |
| Pint Half Full Ltd | Hospitality | 2026 |
| Pioneer Brickwork Limited | Construction | 2024 |
| Pioneer Railtrack Maintenance Services Limited | Construction | 2014 |
| Piotr Car Transport Ltd | Wholesale & retail | 2017 |
| Piotr Mario Building Ltd | Construction | 2025 |
| Piotr Van Services Ltd | Transport & logistics | 2016 |
| PIP Ewart Limited | Transport & logistics | 2012 |
| Piparella Graze Ltd | Hospitality | 2025 |
| Pipe Plumbing Ltd | Construction | 2025 |
| Piper George Accommodations Ltd | Real estate | 2025 |
| Pipercross Limited | Manufacturing | 1998 |
| Pipewell Foot Beagles Limited | Arts & recreation | 2006 |
| Pippa's Blinds Limited | Wholesale & retail | 2009 |
| Pippaluke Ltd | Real estate | 2015 |
| Pippins Digital Marketing Limited | Professional & scientific | 2022 |
| Piraba Trading Ltd | Wholesale & retail | 2025 |
| Pirate Crew Ltd | Administrative & support | 2009 |
| Pirate King Prints Ltd | Wholesale & retail | 2024 |
| Piroto Labelling Limited | Manufacturing | 1973 |
| Pis-Trans Ltd | Transport & logistics | 2019 |
| PIT Lane Events Limited | Arts & recreation | 2024 |
| Pitchplay Ltd | Arts & recreation | 2022 |
| Pitmore Limited | Real estate | 2012 |
| Pitsford Consulting Limited | Professional & scientific | 2013 |
| Pitsford Falcons Pest Control UK Ltd | Agriculture & fishing | 2024 |
| Pitsford Hall Stables Residents Association Limited | Households | 1992 |
| Pitstop Northampton Limited | Wholesale & retail | 2024 |
| Pitt & Co Group Ltd | Manufacturing | 2025 |
| Pitt and Co 1858 Limited | Manufacturing | 2026 |
| Pittam Holdings Ltd | Financial services | 2025 |
| Pittam Properties Ltd | Real estate | 2022 |
| Pivot Dash Ltd | Professional & scientific | 2018 |
| Pivot Edge Solutions Limited | Professional & scientific | 2024 |
| Pivot Point Services Limited | Administrative & support | 2015 |
| Pivot SIX Ltd | Information & communication | 2025 |
| Pivotal Healthcare Ltd | Health & social care | 2019 |
| Pixel Home Improvements Limited | Construction | 2021 |
| Pixelberry Media Ltd | Wholesale & retail | 2025 |
| Pixeldan Limited | Information & communication | 2025 |
| Pizza 75 Ltd | Hospitality | 2019 |
| Pizza Only Ltd | Administrative & support | 2019 |
| Pizzeria Oregano Ltd | Hospitality | 2024 |
| PJ 40 Limited | Hospitality | 2018 |
| PJ Evergreen Limited | Professional & scientific | 2017 |
| PJ Painting and Decorating Ltd | Construction | 2021 |
| PJ Planning Ltd | Professional & scientific | 2023 |
| PJ22 UK Ltd | Health & social care | 2012 |
| PJB Property Limited | Construction | 2018 |
| PJC Joinery & Construction Ltd | Construction | 2021 |
| PJD Properties Development Ltd | Real estate | 2024 |
| PJL Developments & Land Ltd | Construction | 2021 |
| PJL Welham Green Ltd | Construction | 2025 |
| PJM Precision Engineering Ltd | Manufacturing | 2002 |
| PJM Surfacing Limited | Construction | 2025 |
| PJT Property Solutions Limited | Real estate | 2021 |
| PK and SON Ltd | Construction | 2025 |
| PK Precision Limited | Professional & scientific | 2013 |
| PK Realisations Limited | Administrative & support | 2006 |
| PK Sound UK Ltd | Wholesale & retail | 2026 |
| Pk's Property Business Ltd | Real estate | 2020 |
| PK3 Consulting Ltd | Construction | 2019 |
| PKA Business Consulting Limited | Professional & scientific | 2015 |
| PKK Property Maintenance and Management Ltd | Construction | 2021 |
| Pkpf Limited | Hospitality | 2024 |
| PKT Transport Services Ltd | Transport & logistics | 2019 |
| Place and Purpose CIC | Professional & scientific | 2020 |
| Placeposition Ltd | Construction | 2014 |
| Plan B Underground Ltd | Hospitality | 2025 |
| Plan-It Office Solutions Limited | Information & communication | 2007 |
| Planet & Purpose Ltd | Professional & scientific | 2024 |
| Planet (2002) Ltd | Manufacturing | 2003 |
| Planet Data Ltd | Information & communication | 2022 |
| Planet Enterprise Northampton Ltd | Hospitality | 2024 |
| Planet Signs Limited | Administrative & support | 2003 |
| Planetlapse UK Ltd | Professional & scientific | 2016 |
| Planit Resilient Ltd | Extraterritorial | 2013 |
| Planlane Limited | Real estate | 1999 |
| Planned by Limited | Professional & scientific | 2021 |
| Planner B Ltd | Transport & logistics | 2025 |
| Plant Pet Club Ltd | Wholesale & retail | 2019 |
| Plant Tree Biotech Ltd | Manufacturing | 2021 |
| Plantain Essential Oils Ltd | Wholesale & retail | 2008 |