| PHI Building Services Ltd | Construction | 2025 |
| Phil Dunsdon Insurance Services Ltd. | Financial services | 1988 |
| Philip Barber Ltd | Administrative & support | 2007 |
| Philip Stratfull Ltd | Construction | 2009 |
| Philippa Jarvis Planning Consultancy Ltd | Construction | 2009 |
| Phit Lifestyle Limited | Arts & recreation | 2012 |
| Phntm Fitness Ltd | Wholesale & retail | 2023 |
| Phoebus (UK) Limited | Administrative & support | 2013 |
| Phoenix Cooper Limited | Wholesale & retail | 2016 |
| Phoenix Cycle Repairs Limited | Wholesale & retail | 2025 |
| Phoenix Datacom Limited | Information & communication | 2022 |
| Phoenix Energy Community CIC | Professional & scientific | 2024 |
| Phoenix Freedom Limited | Health & social care | 2025 |
| Phoenix Mecano Limited | Wholesale & retail | 1977 |
| Phoenix Medical Advice and Repatriation Limited | Health & social care | 1998 |
| Phoenix Physiotherapy Limited | Health & social care | 2022 |
| Phosgene Ltd | Wholesale & retail | 2023 |
| Photography Coaches Ltd | Professional & scientific | 2022 |
| Photon Consultancy Services Limited | Information & communication | 2014 |
| Phronesis Care Services Ltd | Health & social care | 2017 |
| Phronesis Support&Services Ltd | Transport & logistics | 2020 |
| PHX Services Ltd | Transport & logistics | 2026 |
| Physiohealinghands Ltd | Health & social care | 2017 |
| Phénix Productions Ltd | Information & communication | 2024 |
| Pickled Donkey Ltd | Information & communication | 2024 |
| Pickupz Ltd | Wholesale & retail | 2024 |
| Picot Plumbing & Utility Services Ltd | Construction | 2021 |
| Pierre Francis Ltd | Wholesale & retail | 2019 |
| Pietra Dura Limited | Wholesale & retail | 2011 |
| PIK Joinery Ltd | Construction | 2019 |
| Piling Equipment Design Solutions Limited | Other services | 2017 |
| Pilmoor Solar Limited | Energy | 2021 |
| Pilot Research Limited | Information & communication | 2022 |
| Pinar Tekin Ltd | Professional & scientific | 2016 |
| Pink Ladoo Publishing Ltd | Information & communication | 2020 |
| Pinnacle Aviation Limited | Transport & logistics | 2018 |
| Pinnacle Estate Management Ltd | Real estate | 2023 |
| Pinnacle Global Logistics Ltd | Transport & logistics | 2026 |
| Pinnacle Orient Supply Limited | Wholesale & retail | 2025 |
| Pinnacle Vehicle Design Ltd | Extraterritorial | 2016 |
| Pipecraft Mechanical Ltd | Construction | 2025 |
| Pitchcott Rectory Limited | Professional & scientific | 2025 |
| Pitt Family Office (UK) Limited | Construction | 2024 |
| Pixel Edge Ltd | Professional & scientific | 2014 |
| PJ Construct Limited | Construction | 2023 |
| PJB Pathology Limited | Health & social care | 2026 |
| Plain Pencil Limited | Administrative & support | 2003 |
| Planaccounts.Net Limited | Professional & scientific | 2013 |
| Planet Engineering & Presswork Limited | Manufacturing | 1994 |
| Planet Health & Organics Limited | Wholesale & retail | 2002 |
| Planet Healthy Ltd | Wholesale & retail | 2018 |
| Planet Playcentres Ltd | Hospitality | 2010 |
| Planit Wealth Limited | Financial services | 2023 |
| Planning Streamline Ltd | Information & communication | 2025 |
| Plant Finders Limited | Wholesale & retail | 2019 |
| Platinum Pads Property Management Limited | Real estate | 2017 |
| Platinum View Limited | Administrative & support | 2025 |
| Playmaker Ventures Ltd | Professional & scientific | 2025 |
| Plenty’S Engineering Solutions Ltd | Professional & scientific | 2018 |
| Plexbourne Builders Limited | Construction | 1998 |
| Plough Cottage Limited | Professional & scientific | 2010 |
| Plough END & Aylesbury Road (Bierton) Management Company Limited | Households | 2006 |
| Pluckrose Ltd | Health & social care | 2022 |
| Plumbing and Heating Surgeons Ltd | Construction | 2022 |
| Plumbsafe Ltd | Construction | 2025 |
| Plus 5IVE Ltd | Professional & scientific | 2025 |
| Plutonium Investors Ltd | Financial services | 2018 |
| PLW Interiors Limited | Other services | 2011 |
| PM 64 Ltd | Professional & scientific | 2025 |
| PM Cleaning Services Bucks Limited | Administrative & support | 2021 |
| PNB Healthcare Limited | Health & social care | 2020 |
| Pnsk Ltd | Real estate | 2023 |
| Point International Security Limited | Information & communication | 1982 |
| Point North Construction Ltd | Construction | 2009 |
| Polar Properties Trading Ltd | Real estate | 2024 |
| Pole Attack Kids Ltd | Arts & recreation | 2022 |
| Pole Attack Ltd | Arts & recreation | 2010 |
| Pollen Consulting Limited | Information & communication | 2022 |
| Pollen Tree Limited | Information & communication | 2007 |
| Polly and Petal Ltd | Wholesale & retail | 2025 |
| Pook Heating Services Ltd | Other services | 2021 |
| Pookout Records Ltd | Wholesale & retail | 2021 |
| POP Poms Ltd | Wholesale & retail | 2023 |
| POP Therapy Ltd | Health & social care | 2024 |
| Popeyes (Aylesbury Barbers) Ltd | Other services | 2019 |
| Popiah Ltd | Hospitality | 2018 |
| Poplar (Aylesbury) Management Company Limited | Households | 1982 |
| Popular Transport & Logistics Ltd | Transport & logistics | 2025 |
| Porehouse Limited | Manufacturing | 2019 |
| Porterco Consulting Ltd | Information & communication | 2018 |
| Porterhouse Travel Ltd | Administrative & support | 2026 |
| Portfolio Print Limited | Manufacturing | 2023 |
| Portline QA Services Ltd | Information & communication | 2017 |
| Posh Nosh Food Ltd | Wholesale & retail | 2026 |
| Possability Services Limited | Professional & scientific | 1998 |
| Possum Controls Limited | Professional & scientific | 1976 |
| Possum Limited | Manufacturing | 1961 |
| Possum Research and Development Limited | Extraterritorial | 1976 |
| Possum Trust(The) | Health & social care | 1984 |
| Postcode Boiler Cover Limited | Construction | 2024 |