| Perplexity Limited | Wholesale & retail | 2023 |
| Personaility Ltd | Other services | 2021 |
| Pestana Enterprise Ltd | Financial services | 2020 |
| Pesvebi Ltd | Manufacturing | 2012 |
| Pet Bucket Ltd | Wholesale & retail | 2013 |
| Petals & Pastures Ltd | Wholesale & retail | 2021 |
| Peter Bambridge Haulage Ltd | Transport & logistics | 2018 |
| Peter's House Ltd | Information & communication | 2019 |
| Peterokolo Ltd | Hospitality | 2025 |
| PG Fire UK Ltd | Manufacturing | 2022 |
| PGD Cleaning Ltd | Other services | 2016 |
| PH Energy Services Limited | Administrative & support | 2007 |
| PH Wine Merchants Limited | Wholesale & retail | 2020 |
| PH Wines and Sons Holdings Limited | Wholesale & retail | 2020 |
| Phantom Properties Limited | Real estate | 2003 |
| Pharmabeautics Ltd | Health & social care | 2021 |
| PHASE2 Microwave Limited | Manufacturing | 2004 |
| Phased Electrical Services Limited | Construction | 2023 |
| Phasetech Ltd | Professional & scientific | 2018 |
| Pherus Healthcare Ltd | Health & social care | 2022 |
| Phfaces of Life Ltd | Professional & scientific | 2016 |
| Phil Nichol Ltd | Arts & recreation | 2011 |
| Philip Rae-Scott Studio Ltd | Arts & recreation | 2026 |
| Phill Brown Ltd T/A Chipsaway Ltd | Wholesale & retail | 2015 |
| Phivco UK II Limited | Administrative & support | 2009 |
| Phivco UK Limited | Administrative & support | 2009 |
| Phoenix Building Renovations Ltd | Construction | 2023 |
| Phoenix Consultancy and Advisory Services Limited | Professional & scientific | 2021 |
| Phoenix Electrical Nationwide Limited | Construction | 2018 |
| Phoenix Financials Limited | Professional & scientific | 2021 |
| Phoenix Fire Installations Limited | Extraterritorial | 2007 |
| Phoenix Running Bedfordshire Limited | Arts & recreation | 2025 |
| Phoenix Running Cambridgeshire Ltd | Arts & recreation | 2025 |
| PHS Electrical Services Ltd | Manufacturing | 2014 |
| Phthalo Limited | Health & social care | 2020 |
| Pi&Ps Limited | Construction | 2024 |
| PIA Properties (UK) Limited | Real estate | 2017 |
| Pick Your Own Fenchurch Street Limited | Hospitality | 2024 |
| Pick Your Own Limited | Hospitality | 2024 |
| PICK2DROP Ltd | Wholesale & retail | 2015 |
| Picklestix TCG Limited | Wholesale & retail | 2022 |
| Picture Vehicle Guild UK Limited | Other services | 2021 |
| Pile Pest Control - Heat Treatments Ltd | Administrative & support | 2024 |
| Pilgrims Way Pre-School CIC | Education | 2016 |
| PIN Green Autos Ltd | Wholesale & retail | 2024 |
| Pin-Point Construction Ltd | Construction | 2018 |
| Pine Health Care Services Limited | Public administration | 2020 |
| Pinecrest Estates Ltd | Construction | 2023 |
| Pinnacle Nexus Management Ltd | Professional & scientific | 2025 |
| Pinnacle Plumbers & Heating Ltd | Construction | 2019 |
| Pinzutu Films LLP | | 2016 |
| Pioneer Kingdom Limited | Real estate | 2025 |
| Pioneer Medical Recruitment Limited | Administrative & support | 2025 |
| Pioneering Healthcare Solutions Ltd | Other services | 2011 |
| Piotr P Builder Limited | Construction | 2023 |
| Pirie Holdings Limited | Real estate | 2022 |
| Pitch to Post Limited | Information & communication | 2013 |
| Pitts & Co Properties Limited | Real estate | 2024 |
| Piuleas Ltd | Construction | 2018 |
| Piye Taxis Limited | Transport & logistics | 2026 |
| Pizza Equipment Limited | Wholesale & retail | 1990 |
| PJC Carpentry and Construction Herts Ltd | Construction | 2025 |
| PJD Transport Limited | Transport & logistics | 2025 |
| PJH Project Consultancy Limited | Information & communication | 2025 |
| PJM Network Security Limited | Information & communication | 2025 |
| PJR Homes Ltd | Households | 2024 |
| PJS Automotive Limited | Wholesale & retail | 2005 |
| PK Apps Ltd | Information & communication | 2025 |
| PK Electra Services Limited | Transport & logistics | 2005 |
| Pkds Services Limited | Administrative & support | 2008 |
| PL4Y Ltd | Hospitality | 2015 |
| Plaboo Ltd | Information & communication | 2024 |
| Placitas Limited | Health & social care | 2025 |
| Planclarity Limited | Professional & scientific | 2025 |
| Plantcare Horticultural Services Limited | Other services | 2004 |
| Plasma Network Limited | Information & communication | 2003 |
| Plastering Services Midlands Ltd | Construction | 2018 |
| Platinum Flooring Specialist Ltd | Extraterritorial | 2020 |
| Platinum Interior Solutions Limited | Construction | 2018 |
| Platinum K9 Defence Limited | Education | 2025 |
| Platt Associates Limited | Administrative & support | 2013 |
| Playmate Labs Limited | Manufacturing | 2024 |
| Playwell Studios Limited | Professional & scientific | 2025 |
| Pleo Spring Ltd | Real estate | 2025 |
| PLJ Facades Consultant Ltd | Professional & scientific | 2017 |
| PLJ Properties Management Ltd | Real estate | 2024 |
| Plot 4 Holdings Limited | Financial services | 2026 |
| Plot 4 Ltd | Administrative & support | 2016 |
| Plumbco Solutions Ltd | Construction | 2025 |
| Plumbrightt Ltd | Construction | 2025 |
| Plume of Paradise Publishing Ltd | Information & communication | 2025 |
| Plume Pictures Ltd | Information & communication | 2024 |
| Plus 2 Clothing LLP | | 2021 |
| Plus Parts Limited | Professional & scientific | 1992 |
| Plus Plumbing Limited | Construction | 2019 |
| PM Cardioecho Ltd | Health & social care | 2025 |
| PM Financial Management Ltd | Administrative & support | 2013 |
| Pmac Holdings Ltd | Financial services | 2025 |
| PMS Design Studio Limited | Professional & scientific | 2005 |
| Pneumatic Ballistics Limited | Administrative & support | 2012 |