| Principal Cloud Limited | Extraterritorial | 2017 |
| Principal Consortium Limited | Financial services | 1991 |
| Principal Corporation Limited | Extraterritorial | 2017 |
| Principal I Limited | Manufacturing | 1987 |
| Principal II Limited | Extraterritorial | 1995 |
| Principal IV Limited | Extraterritorial | 2023 |
| Principal Projx Ltd | Construction | 2018 |
| Principal V1 Ltd | Extraterritorial | 2000 |
| Principle Corporation Limited | Real estate | 1995 |
| Pristine Contract Cleaning Services Ltd | Administrative & support | 2006 |
| Pristine Paws Limited | Other services | 2024 |
| Pristine Polish Ltd | Wholesale & retail | 2025 |
| Private Wealth Mortgages Limited | Financial services | 2005 |
| Pro Factory Ltd | Manufacturing | 2025 |
| Pro Liquidations Ltd | Wholesale & retail | 2021 |
| Pro-Curo Software Ltd | Information & communication | 2011 |
| Pro-Focus Accounting Limited | Professional & scientific | 2026 |
| Proactive International Holdings Limited | Information & communication | 2025 |
| Proactive International PR Ltd | Information & communication | 2010 |
| Probate Partners Limited | Professional & scientific | 2007 |
| Probate Resealing Services Ltd | Professional & scientific | 2016 |
| Probates R ME Limited | Other services | 2009 |
| Probitas Developments Limited | Construction | 2016 |
| Problake Ltd | Information & communication | 2023 |
| Procompliance Ltd | Professional & scientific | 2018 |
| Procure CON Limited | Professional & scientific | 2011 |
| Product-Led Thinking Ltd | Information & communication | 2025 |
| Production N.E.T. Limited | Information & communication | 2012 |
| Productive Business Systems Ltd | Administrative & support | 2016 |
| Professional Plus Services Limited | Administrative & support | 2019 |
| Proglaziers Ltd | Construction | 2017 |
| Progression Ventures Group Ltd | Wholesale & retail | 2022 |
| Progressive Music Ltd | Information & communication | 2016 |
| Proite Ltd | Information & communication | 2021 |
| Project Barclay Bidco Limited | Financial services | 2020 |
| Project Barclay Midco Limited | Financial services | 2020 |
| Project Barclay Topco Limited | Financial services | 2020 |
| Project Blank UK Holdings Limited | Wholesale & retail | 2021 |
| Project Excelsior Limited | Administrative & support | 2024 |
| Project Kingfisher Bidco Limited | Financial services | 2026 |
| Project Kingfisher Midco Limited | Financial services | 2026 |
| Project Kingfisher Topco Limited | Financial services | 2026 |
| PROJECTBUILD21 Ltd | Construction | 2021 |
| Projects 2 Air Ltd | Information & communication | 2022 |
| Projectum Management Limited | Professional & scientific | 2014 |
| Proline Drainage Limited | Construction | 2021 |
| Promeritum South Limited | Financial services | 2021 |
| Promosport Limited | Arts & recreation | 1996 |
| Pronexus Solutions Ltd | Professional & scientific | 2023 |
| Propeller Apps Ltd | Information & communication | 2023 |
| Property Fire Protection Limited | Public administration | 2013 |
| Property Investments (019) Ltd | Other services | 2017 |
| PROPERTY1000 Ltd | Real estate | 2012 |
| Propquest Solutions Ltd | Real estate | 2025 |
| Propvie Services Limited | Real estate | 2017 |
| Proroma Ltd | Agriculture & fishing | 2026 |
| Prospa Creative Ltd | Other services | 2023 |
| Prospera Ltd | Other services | 2023 |
| Prosperity Marketing Ltd | Administrative & support | 2025 |
| Protectifyai Security Ltd | Information & communication | 2025 |
| Protem Services Limited | Professional & scientific | 1998 |
| Proteus Research Ltd. | Professional & scientific | 2000 |
| Provender Mews Management Company Ltd | Households | 2023 |
| Provender Mill Ltd | Professional & scientific | 2017 |
| Prymachenko Holding Limited | Financial services | 2018 |
| Pryme Education Ltd | Education | 2010 |
| Psarioti IT Services Ltd | Information & communication | 2019 |
| PSI - PAY Ltd | Financial services | 2006 |
| PSI Design Limited | Manufacturing | 1996 |
| Psysoft Limited | Health & social care | 2009 |
| PTS Enterprise Holdings Ltd | Financial services | 2023 |
| PUG Ltd | Extraterritorial | 2018 |
| Pulborough Private Car Hire Limited | Transport & logistics | 1998 |
| Pulsarsim Ltd | Information & communication | 2024 |
| Pulse Secure Transport Ltd | Professional & scientific | 2019 |
| Punk and Poodle Ltd | Wholesale & retail | 2020 |
| PUP and a Way Limited | Information & communication | 2021 |
| Pure Illustration Limited | Administrative & support | 2008 |
| Purecycle Metals Ltd | Wholesale & retail | 2024 |
| Purely Public Relations Limited | Professional & scientific | 2016 |
| Purestream Digital Ltd | Professional & scientific | 2024 |
| Puretech Racing Management Limited | Extraterritorial | 2011 |
| Purple Bubble Happy Co Ltd | Other services | 2023 |
| Purple Patch Safety Solutions Ltd. | Professional & scientific | 2016 |
| Putt in the Park Limited | Arts & recreation | 1987 |
| PW Reader Carpentry & Joinery Ltd | Construction | 2018 |
| Pyramid View Consulting Ltd | Transport & logistics | 2020 |
| Pz's Caring Hands Ltd | Public administration | 2023 |
| Q & a People Matter Limited | Financial services | 2010 |
| Qasteq LLP | | 2005 |
| QHH Limited | Hospitality | 2011 |
| QHS Contracting Limited | Construction | 2005 |
| QOL Solutions Ltd | Professional & scientific | 2009 |
| Qrwebtech Ltd | Information & communication | 2025 |
| Qualifyuk Limited | Education | 2025 |
| Quality Transport Options Ltd | Transport & logistics | 2025 |
| Quantric Trading Ltd | Professional & scientific | 2020 |
| Quantum Leap Investments Ltd | Real estate | 2025 |
| Quayline (G.R.P.) Limited | Transport & logistics | 1990 |
| Queen of Behaviours Ltd | Professional & scientific | 2014 |