| Pineapple RUM Ltd | Real estate | 2020 |
| Pinks Mews (Milford) Management Company Limited | Households | 2000 |
| Pippin Technology Limited | Information & communication | 2025 |
| Pitch Pals Coaching LLP | | 2023 |
| PJM Overseas Limited | Administrative & support | 2024 |
| Pjsw Consultancy Limited | Professional & scientific | 2019 |
| Pkalbradbury Limited | Professional & scientific | 2015 |
| Planit Consultants Limited | Professional & scientific | 2011 |
| Plant-For-The-Planet UK | Education | 2012 |
| Planteria Group (UK) Limited | Administrative & support | 2010 |
| Planteria Holdings Limited | Financial services | 2022 |
| Planvine Ltd | Administrative & support | 2010 |
| Plastiweld Fabrications Limited | Manufacturing | 1990 |
| Plastiweld Holdings Limited | Professional & scientific | 1999 |
| Player 1 Limited | Administrative & support | 2012 |
| PLM Home & Garden Improvements Limited | Construction | 2004 |
| Plot. Surveys Ltd | Construction | 2022 |
| PM Logistics Consulting Limited | Professional & scientific | 2025 |
| PM Sixty Sixty Ltd | Wholesale & retail | 2008 |
| Pmoonline Limited | Information & communication | 2006 |
| Podguest Ltd | Information & communication | 2025 |
| Pointside Investments Ltd | Administrative & support | 2019 |
| Poke Music Limited | Information & communication | 2009 |
| Pokodo Group Limited | Real estate | 2024 |
| Pombal Ltd | Households | 2023 |
| Ponti Court Property Management Ltd | Real estate | 2005 |
| Poppins AI Ltd | Information & communication | 2026 |
| Population Health Ltd | Health & social care | 2016 |
| Portal Medics Limited | Health & social care | 2017 |
| Porter Advisory Ltd | Professional & scientific | 2014 |
| Positive Production Ltd | Hospitality | 2021 |
| Possibilate Limited | Professional & scientific | 2000 |
| PR3P Limited | Wholesale & retail | 2025 |
| PR42 Ltd | Professional & scientific | 2020 |
| Praenato Limited | Administrative & support | 2022 |
| Precision Rewards Ltd | Administrative & support | 2018 |
| Predictive Risk Ltd | Financial services | 2019 |
| Premier Accounting and Business Services Ltd | Professional & scientific | 2019 |
| Premier Development & Construction Limited | Construction | 2021 |
| Prescient Financial Services Group Limited | Professional & scientific | 2018 |
| Prescient Global Limited | Financial services | 2011 |
| Press Play Consulting Ltd | Information & communication | 2017 |
| Prestige BTL Holdings Ltd | Real estate | 2026 |
| Pretium Partners UK Limited | Professional & scientific | 2018 |
| Pringle and Pringle Interiors Limited | Professional & scientific | 2015 |
| Priors Field Enterprises Limited | Transport & logistics | 1999 |
| Probert's Warren Ltd | Wholesale & retail | 2022 |
| Procal Calibration Services Limited | Professional & scientific | 2016 |
| Process Psychology Ltd | Health & social care | 2017 |
| Procurement & Commercial Marketplace Solutions Ltd | Professional & scientific | 2023 |
| Product Management Consulting Limited | Professional & scientific | 2025 |
| Progressive Equity Research Limited | Information & communication | 2012 |
| Project Oasis North Downs | Hospitality | 1995 |
| Project Sixty Three Ltd | Wholesale & retail | 2024 |
| Promotional Sourcing Global Limited | Other services | 2011 |
| Proper House Ltd | Real estate | 2015 |
| Property Development Specialists Limited | Construction | 2010 |
| Property Inventory Group Ltd | Other services | 2018 |
| Property People London & Lisbon Ltd | Real estate | 2013 |
| Property Potential Surrey Ltd | Other services | 2014 |
| Protype Services Ltd | Administrative & support | 2021 |
| Provenance Cars Limited | Wholesale & retail | 2021 |
| Psychology and Medical Services Limited | Health & social care | 2022 |
| Psychology in Perspective Ltd | Education | 2016 |
| Publicity and Display Limited | Manufacturing | 1975 |
| Pulp Kitchen Media Ltd | Information & communication | 2023 |
| Purpur Violet Limited | Professional & scientific | 2023 |
| Pursuit of Leisure Ltd | Wholesale & retail | 2022 |
| Putley Properties Ltd | Households | 2025 |
| Pwer Ltd | Arts & recreation | 2021 |
| Pyramid Europa Limited | Wholesale & retail | 1993 |
| PZB Property Limited | Real estate | 2019 |
| Q3 Facilities Holdings Limited | Administrative & support | 2017 |
| Q3 Grounds Services Limited | Administrative & support | 2002 |
| Q3 Security Limited | Administrative & support | 2020 |
| Q3 Services Group Limited | Administrative & support | 2018 |
| Q3 Technical Services Limited | Professional & scientific | 1989 |
| Q9 Elements Limited | Information & communication | 2015 |
| Qsta Ltd | Wholesale & retail | 2024 |
| Qsync Growth Consulting Limited | Professional & scientific | 2025 |
| Quaff Box Limited | Hospitality | 2017 |
| Quantix Solutions Limited | Professional & scientific | 2011 |
| Quantum Acoustics Ltd | Professional & scientific | 2022 |
| Quantum Air Ltd | Professional & scientific | 2023 |
| Quantum Engineering & Consulting Group Ltd | Professional & scientific | 2023 |
| Quantum Environmental Ltd | Professional & scientific | 2023 |
| Quantum Fire Consultancy Ltd | Professional & scientific | 2023 |
| Quantum Marketing Services Ltd | Administrative & support | 1990 |
| Quantum Monitoring Ltd | Professional & scientific | 2023 |
| Quelch Media Partners Ltd | Information & communication | 2025 |
| Questrum Holdings Limited | Real estate | 1974 |
| Quextro Ltd | Information & communication | 2024 |
| Quorum Solutions Limited | Professional & scientific | 2012 |
| R & H Barbershop Ltd | Other services | 2025 |
| R & R Climbing Ltd | Education | 2024 |
| R and V Builds Ltd | Construction | 2025 |
| R G Fleetwood Ltd | Real estate | 2026 |
| R G Young & SON Ltd | Wholesale & retail | 2022 |
| R Holwell and Sons Ltd | Construction | 2014 |
| R.C. Plant Hire Limited | Construction | 2003 |