| Pilates Code Limited | Arts & recreation | 2017 |
| Pilgrim Projects Limited | Professional & scientific | 2000 |
| Pilgrimage People Ltd | Administrative & support | 2010 |
| Pilotium Education Limited | Administrative & support | 2025 |
| Pimlico Property Limited | Real estate | 2024 |
| Pimp My Fish Ltd | Hospitality | 2020 |
| PIN Bearing Co., Ltd | Extraterritorial | 2013 |
| Pinchbeck Fields Residents Management Company Limited | Households | 2017 |
| Pine Clinic Limited | Health & social care | 2024 |
| Pineapple Genius Ltd | Wholesale & retail | 2022 |
| Pinehurst Freeholding Company Limited | Other services | 1993 |
| Pinehurst Park Homes Limited | Hospitality | 2012 |
| Pinehurst Vehicle Charging Ltd | Other services | 2021 |
| Pineview (Management) Limited | Households | 1990 |
| Pinewood Mews (Iver Heath) Management Company Limited | Households | 2002 |
| Ping Payments Limited | Information & communication | 2022 |
| Ping Ping Bar Ltd | Wholesale & retail | 2023 |
| Pinguapps Limited | Information & communication | 2023 |
| Pinion Limited | Professional & scientific | 2025 |
| Pink FOX Property Holdings Limited | Financial services | 2025 |
| Pink FOX Property Limited | Real estate | 2024 |
| Pink FOX Wellness Ltd | Information & communication | 2025 |
| Pinkard Partners LLP | | 2010 |
| Pinkwood Living Limited | Real estate | 2026 |
| Pinnacle Estimating Solutions Ltd | Professional & scientific | 2018 |
| Pinnacle Highworth Limited | Real estate | 2018 |
| Pinnacle Ledger Ltd | Professional & scientific | 2025 |
| Pinnacle Neuroscience Ltd | Professional & scientific | 2024 |
| Pinnacle Trades & Services Limited | Wholesale & retail | 2016 |
| Pinnacle Vehicle Solutions Limited | Construction | 2011 |
| Pinpin Aeroservices Ltd | Manufacturing | 2024 |
| Pintilie Clothing Limited | Wholesale & retail | 2024 |
| Pinto Praia Ltd | Manufacturing | 2025 |
| Pioneer Court Management Company Limited | Real estate | 2003 |
| Pioneer House Management Limited | Real estate | 2004 |
| Pionew UK Limited | Financial services | 2021 |
| PIP Foulsham HR Limited | Administrative & support | 2019 |
| PIP Global Ltd | Professional & scientific | 2022 |
| Piper International Holdings Topco Limited | Financial services | 2025 |
| Pipettra Ltd | Wholesale & retail | 2025 |
| Pipmg Ltd | Other services | 2012 |
| Pippa's Blinds (Cambridgeshire) Ltd | Construction | 2016 |
| Pips Nursery Limited | Education | 2013 |
| Pistachio Creative Ltd | Professional & scientific | 2024 |
| Pitcher and Sons Property Limited | Real estate | 2023 |
| Pitchford Ventures Ltd | Financial services | 2026 |
| Pitoi Silviu Automotive Ltd | Manufacturing | 2025 |
| Pitpatpet Ltd | Manufacturing | 2014 |
| Pivoine Cambridge Limited | Health & social care | 2025 |
| Pivot Properties Limited | Real estate | 2018 |
| Pivotal Future Ltd | Professional & scientific | 2021 |
| Pixel Power Limited | Information & communication | 1987 |
| Pixel Staffing Ltd | Administrative & support | 2025 |
| Pixelburn Limited | Information & communication | 2004 |
| Pixl BIO Ltd | Professional & scientific | 2011 |
| Pizza School Clarendon Arms Limited | Hospitality | 2025 |
| Pizza School Napoleat Ltd | Hospitality | 2025 |
| PJ Arnold Entertainment Ltd | Information & communication | 2022 |
| PJ Music Academy Limited | Education | 2021 |
| PJC Cleaning Ltd | Administrative & support | 2025 |
| Pjjm Limited | Transport & logistics | 2021 |
| PJP National Composites Ltd | Professional & scientific | 2018 |
| PJW Kitchens and Bathrooms Ltd | Construction | 2025 |
| PK Advisors Ltd | Professional & scientific | 2013 |
| PK Composites Ltd | Manufacturing | 2023 |
| Pkpro Ltd | Manufacturing | 2023 |
| Pksm Freehold Ltd | Real estate | 2014 |
| PKV Werks Ltd | Manufacturing | 2022 |
| PL Aesthetic Supplies Ltd | Wholesale & retail | 2021 |
| Place Leadership Practice Ltd | Professional & scientific | 2024 |
| Placenta Biotech Ltd | Professional & scientific | 2025 |
| Plama (UK) Limited | | 1982 |
| Plan IT Architecture & Design Ltd | Professional & scientific | 2017 |
| Plan-It Reprographics (Cambridge) Limited | Manufacturing | 1993 |
| Planartech (Holdings) Ltd | Professional & scientific | 2020 |
| Planartech UK Limited | Professional & scientific | 2015 |
| Planartech Ventures Limited | Professional & scientific | 2019 |
| Plandot Ltd | Information & communication | 2022 |
| Plane Creative Limited | Transport & logistics | 2016 |
| Plane Sailing Air Displays Limited | Arts & recreation | 1989 |
| Plane Tree Mews Residents Association Limited | Households | 2005 |
| Planet Friendly Living Ltd | Wholesale & retail | 2020 |
| Planet KC Limited | Construction | 2014 |
| Planet RGB Limited | Information & communication | 2012 |
| Planet Watch Ltd | Extraterritorial | 2022 |
| Planned by ASH Limited | Other services | 2022 |
| Planning Manager Ltd | Professional & scientific | 2003 |
| Planning Matters LLP | | 2012 |
| Plant Addict Ltd | Agriculture & fishing | 2023 |
| Plantation Accounting Ltd | Professional & scientific | 2011 |
| Plantbiome Ltd | Professional & scientific | 2025 |
| Plantcode Ltd | Professional & scientific | 2022 |
| Plantm Limited | Agriculture & fishing | 2015 |
| Plantsilver Limited | Administrative & support | 2004 |
| Planvue Limited | Construction | 2021 |
| Plaquetec Limited | Professional & scientific | 2007 |
| Plastometrex Ltd | Professional & scientific | 2018 |
| Platform Strategy Consulting Limited | Professional & scientific | 2020 |
| Platform Twenty Limited | Information & communication | 2013 |
| Platinum Accounting Solutions Limited | Professional & scientific | 2016 |