| Pinkgable Limited | Households | 1981 |
| Pinnacle Managed Services Limited | Information & communication | 2014 |
| Pinnacle Telecom (Wales) Limited | Information & communication | 1996 |
| Pinnath Ltd | Information & communication | 2026 |
| Pinnell Sorella Ltd | Manufacturing | 2018 |
| Pipedream Plumbing and Heating Solutions Ltd | Construction | 2017 |
| Pirvu Transport Ltd | Transport & logistics | 2019 |
| Pivot Plumbing Ltd | Construction | 2025 |
| Pixel Replay Ltd | Wholesale & retail | 2024 |
| PJF Consultancy Ltd | Administrative & support | 2025 |
| Pjgill Ltd | Manufacturing | 2024 |
| PK White Property Investments Ltd | Real estate | 2025 |
| PKA and Brothers Ltd | Wholesale & retail | 2025 |
| PKG Plumbing Limited | Construction | 2019 |
| PKL Roofing Ltd | Construction | 2018 |
| Placehill Ltd. | Financial services | 1966 |
| Plain Clothes Imports Limited | Wholesale & retail | 1990 |
| Planet Batth Properties Ltd | Real estate | 2025 |
| Plant and Ductwork Company Limited | Manufacturing | 1980 |
| Plas Rhosnesni Ltd | Health & social care | 2020 |
| Plascolour Masterbatch Limited | Manufacturing | 1982 |
| Plaster AID Ltd | Construction | 2014 |
| Platinum Brickwork Limited | Construction | 2002 |
| Platinum Flow Plumbing Ltd | Construction | 2026 |
| Platinum Host Ltd | Information & communication | 2022 |
| Platinum QA Systems Ltd | Information & communication | 2017 |
| Play Village Basingstoke Limited | Hospitality | 2017 |
| Plentin Services Ltd | Transport & logistics | 2024 |
| Plentra Ltd | Wholesale & retail | 2026 |
| Plot Marketing Ltd | Administrative & support | 2026 |
| PLS Property Investments Ltd | Real estate | 2020 |
| Plumbers World Limited | Wholesale & retail | 1993 |
| Plumbjax Ltd | Construction | 2019 |
| Pluron Services Limited | Construction | 2012 |
| Plus MAX UK Limited | Manufacturing | 2024 |
| Plus One Percent Ltd | Administrative & support | 2026 |
| Plust Ltd | Information & communication | 2014 |
| PM Construction Solutions Limited | Administrative & support | 2009 |
| PM Safety Consultancy Limited | Professional & scientific | 2024 |
| PMK Solutions Ltd | Professional & scientific | 2018 |
| PN Property Ltd | Real estate | 2017 |
| Pn&J Logistic Services Limited | Professional & scientific | 2016 |
| Point & Pixel Creative Ltd | Information & communication | 2014 |
| Point Source Productions Limited | Professional & scientific | 2014 |
| Pointsec Services Limited | Information & communication | 2019 |
| POL Electrician Ltd | Construction | 2023 |
| Polar Moment Limited | Information & communication | 2012 |
| Poles and Tracks Limited | Wholesale & retail | 2007 |
| Poly Hexa Ltd | Real estate | 2020 |
| Polyverda Limited | Wholesale & retail | 2026 |
| Polyzing Limited | Information & communication | 2002 |
| Pomerite Limited | Mining & quarrying | 2021 |
| Pond View Limited | Professional & scientific | 2011 |
| POP UP Tennis UK Ltd | Arts & recreation | 2019 |
| Poppy's Garden Services Ltd | Other services | 2022 |
| Portals Property Limited | Real estate | 1960 |
| Portway Resources Limited | Professional & scientific | 2009 |
| Positive Beginnings Mother & Baby Ltd | Education | 2025 |
| Positive Business Services Ltd | Information & communication | 2011 |
| Positive Consultancy Limited | Professional & scientific | 2013 |
| Positive Move Limited | Administrative & support | 2002 |
| Positivelife Homes Ltd | Real estate | 2024 |
| Post Box Sports Bar Ltd | Hospitality | 2025 |
| Post Cleaners Ltd | Administrative & support | 2025 |
| Potty LOO Ltd. | Wholesale & retail | 2011 |
| Poulose Limited | Public administration | 2021 |
| Pounce and Paws Dog Grooming Ltd | Extraterritorial | 2022 |
| Powell Collections Group Limited | Administrative & support | 2026 |
| Power Blast International Limited | Other services | 1995 |
| Power Consultancy Ltd | Professional & scientific | 2010 |
| Power Extreme Ltd | Wholesale & retail | 2025 |
| Pozitiv Communications Ltd | Professional & scientific | 2004 |
| Pozitiv Limited | Professional & scientific | 2004 |
| Practical Creatives Ltd | Professional & scientific | 2024 |
| Practice Shield Ltd | Information & communication | 2026 |
| Pradham IT Limited | Information & communication | 2005 |
| Pragma Business Solutions Ltd | Professional & scientific | 2008 |
| Pragmatich Technical Services Private Limited | Professional & scientific | 2025 |
| Prasad Private Limited | Information & communication | 2015 |
| PRE Trades Ltd | Wholesale & retail | 2023 |
| Pre-Read Attached Ltd | Wholesale & retail | 2025 |
| Preact FM Ltd | Construction | 2024 |
| Precise Accounting Services Ltd | Professional & scientific | 2020 |
| Precision Ecommerce Limited | Professional & scientific | 2016 |
| Precision Estates Ltd | Real estate | 2021 |
| Precision Manufacturing London Ltd | Professional & scientific | 2021 |
| Precision Properties Limited | Real estate | 2019 |
| Precision Rehab Ltd | Manufacturing | 2015 |
| Prefix IT Services Limited | Information & communication | 2006 |
| Prelude Entertainment (AV) Limited | Information & communication | 2024 |
| Prem Home PVT Ltd | Real estate | 2018 |
| Premier Apartments (M.C) Limited | Households | 2024 |
| Premier Plus Hire Ltd | Water & waste | 2020 |
| Premier Properties Holdings Limited | Real estate | 2025 |
| Premier Properties Southern Limited | Real estate | 2024 |
| Premier Stationery Limited | Manufacturing | 1996 |
| Premiere Klasse Limited | Wholesale & retail | 2018 |
| Premium Shop (Abbey Road) Limited | Wholesale & retail | 2020 |
| Prep Tuition Ltd | Professional & scientific | 2020 |
| Prestall Ltd | Construction | 2025 |