| Perspolis Logistics Limited | Transport & logistics | 2018 |
| Pertwee Services LLP | | 2023 |
| Peter Whitaker Limited | Information & communication | 2017 |
| Peterden Limited | Construction | 2013 |
| Petra Cozianu Film Ltd | Information & communication | 2017 |
| PG Global Properties Ltd | Real estate | 2018 |
| PG76 Ltd | Transport & logistics | 2022 |
| Pharmareg Services Ltd | Information & communication | 2022 |
| Pharmasol London Ltd | Wholesale & retail | 2019 |
| Phetarah Consulting Limited | Professional & scientific | 2021 |
| Phimfinch Community Interest Company | Education | 2022 |
| Phoenix Coaching and Services Ltd | Wholesale & retail | 2022 |
| Phoenix Developers Limited | Real estate | 2016 |
| Phoenix JEC Property Ltd | Real estate | 2026 |
| Phone Repair Centre Limited | Manufacturing | 2012 |
| PHS Facilities Services Limited | Construction | 1993 |
| Physio Fit Tools Ltd | Other services | 2024 |
| Picturehouse Bookings Limited | Administrative & support | 2008 |
| Picturehouse Cinemas Limited | Information & communication | 1988 |
| Picturehouse Entertainment Limited | Information & communication | 2017 |
| Pika Pika Limited | Wholesale & retail | 1995 |
| Pilonsound Limited | Wholesale & retail | 1983 |
| Pine Applications Limited | Information & communication | 2017 |
| Pinto Engineering Ltd | Professional & scientific | 2025 |
| Pioneer Consulting Services Limited | Administrative & support | 2020 |
| PIS Construction Ltd | Construction | 2025 |
| Pitshanger 204 Ltd | Construction | 2024 |
| Pixel Smart Solutions Ltd | Administrative & support | 2023 |
| Pixelwise Studio Ltd | Information & communication | 2023 |
| Pizza to Go A4 Ltd | Hospitality | 2020 |
| PJP Electrical Ltd | Construction | 2022 |
| PK Advertising Ltd | Professional & scientific | 2022 |
| PK Energy Solutions Ltd | Professional & scientific | 2024 |
| Plainview Media Ltd | Professional & scientific | 2023 |
| Planet Convergence Limited | Information & communication | 2009 |
| Planet E Solutions Limited | Extraterritorial | 2008 |
| Planet Health Solutions Ltd | Manufacturing | 2022 |
| Planet Pathology Limited | Health & social care | 2011 |
| Planet Properties (UK) Limited | Real estate | 2014 |
| Planet Solutions Limited | Information & communication | 1998 |
| Platinum Concierge Limited | Administrative & support | 2018 |
| Platinum Ideas UK. Ltd | Construction | 2018 |
| Playbook Systems Ltd | Professional & scientific | 2023 |
| PLG Healthcare Management Limited | Health & social care | 2014 |
| PLH in the Highlands UK Ltd | Financial services | 2021 |
| Plotrol Geolabs Limited | Information & communication | 2026 |
| Plus Prepared Ltd | Wholesale & retail | 2022 |
| PM London Construction Ltd | Construction | 2020 |
| Pocket Penny Ltd | Wholesale & retail | 2024 |
| Poineer Ltd | Information & communication | 2022 |
| Pointlead Ltd | Wholesale & retail | 2023 |
| Policy-Purpose Consulting Ltd | Professional & scientific | 2021 |
| Polivalka Ltd | Information & communication | 2023 |
| Pomchick Ltd | Wholesale & retail | 2018 |
| Positive Investing Ltd | Real estate | 2023 |
| Post MAN Matt Ltd | Information & communication | 2025 |
| POT Trade Ltd | Construction | 2018 |
| Power and Renewables Associates Limited | Professional & scientific | 2016 |
| Powerbase Community C.I.C. | Information & communication | 2020 |
| Pp&I Ltd | Hospitality | 2016 |
| Practical Advice Consulting Limited | Professional & scientific | 2006 |
| Practice Ranker Limited | Information & communication | 2019 |
| Pragna AI Research & Innovations Labs Limited | Education | 2025 |
| Prashant Tiwari Limited | Information & communication | 2018 |
| Pravdas Limited | Professional & scientific | 2026 |
| Prayash U.K. Limited | Arts & recreation | 2022 |
| Precieuse LLP | | 2022 |
| Premier Auto Deals Ltd | Wholesale & retail | 2024 |
| Premier Plant & Haulage Ltd | Construction | 2014 |
| Premium Teachers Limited | Administrative & support | 2026 |
| Prepsafe UK Limited | Information & communication | 2018 |
| Present Space Limited | Information & communication | 2022 |
| Prime Financing Services Ltd | Information & communication | 2022 |
| Prime London Apartments Limited | Real estate | 2025 |
| Prime Nexus London Limited | Information & communication | 2023 |
| Prime Path Scientific Ltd | Professional & scientific | 2025 |
| Primus Global Solutions Limited | Information & communication | 2019 |
| Primus Homes Ltd | Real estate | 2025 |
| Prinston Care Services Ltd | Transport & logistics | 2025 |
| Print Hub Global Ltd | Professional & scientific | 2020 |
| Printsbyrogue Ltd | Wholesale & retail | 2026 |
| Prism Global Services Limited | Financial services | 2019 |
| Pro Building Contractors Limited | Construction | 2012 |
| Pro Project Recruitment Limited | Construction | 2023 |
| Pro Recruit Global Limited | Professional & scientific | 2019 |
| Pro-Fit Shopfront & Shutters London Ltd | Construction | 2019 |
| Proarch Ltd | Professional & scientific | 2019 |
| Processing Opportunities Limited | Information & communication | 2015 |
| Product Logistics Ltd | Transport & logistics | 2010 |
| Products Dormant Co 2 Limited | Manufacturing | 2016 |
| Professor Pancake Limited | Hospitality | 2025 |
| Proffyn Ltd | Professional & scientific | 2024 |
| Profit From Limited | Financial services | 2023 |
| Profit From Procurement Limited | Professional & scientific | 2017 |
| Profit From Property Limited | Real estate | 2023 |
| Prograce Cleaners Limited | Administrative & support | 2025 |
| Projects Simplified Limited | Information & communication | 2023 |
| Promptmates Ltd | Education | 2025 |
| Promptusetfidelis Ltd | Administrative & support | 2024 |
| Pronto Bite Limited | Hospitality | 2019 |