| Plates Catering and Events Ltd | Hospitality | 2025 |
| Platinum Consulting Surrey Limited | Construction | 2007 |
| PLB Leisure Ltd | Arts & recreation | 2016 |
| Plockton Limited | Real estate | 2026 |
| Plumbtastic Limited | Construction | 2009 |
| Plutusbot Ltd | Professional & scientific | 2020 |
| PM Hive Limited | Administrative & support | 2019 |
| Pocket Software Ltd | Information & communication | 2023 |
| Podeny London Ltd | Manufacturing | 2017 |
| Podium Sports Consulting Ltd | Education | 2016 |
| Poet Limited | Administrative & support | 2015 |
| Pollinia Limited | Information & communication | 2012 |
| Ponnyton Ltd | Hospitality | 2025 |
| Poppea Limited | Health & social care | 2024 |
| Port 443 Ltd | Financial services | 2009 |
| Portare Solutions Limited | Professional & scientific | 2021 |
| Positive Assessments Support and Training Ltd | Education | 2023 |
| Postlink Limited | Administrative & support | 2012 |
| Potholder Productions Limited | Professional & scientific | 2012 |
| Powells Arts Services Limited | Arts & recreation | 2021 |
| Powerwize UK Limited | Professional & scientific | 1994 |
| PP Coachworks Ltd | Wholesale & retail | 2015 |
| PR Leisure Ltd | Construction | 2025 |
| Praetorium Ltd | Real estate | 2025 |
| Praetorium Residential Ltd | Real estate | 2023 |
| Prana Development Ltd | Real estate | 2026 |
| Precision AI Marketing Ltd | Information & communication | 2024 |
| Premier DJ Management (London) Limited | Arts & recreation | 2020 |
| Premier Energy Limited | Professional & scientific | 1998 |
| Premier Gardeners Limited | Administrative & support | 2010 |
| Premium Credit Limited | Financial services | 1986 |
| Premium Line Healthcare Solutions Limited | Administrative & support | 2022 |
| Premium Real Estate Limited | Real estate | 2021 |
| Prescient Health Ltd | Health & social care | 2015 |
| Prescott Clinical Ltd | Health & social care | 2020 |
| Presh Productions Ltd | Information & communication | 2010 |
| Prestige BIN Cleaning Commercial Ltd | Administrative & support | 2019 |
| Prestige External Cleaning Ltd | Administrative & support | 2019 |
| Prestige Power Cleaning Ltd | Administrative & support | 2022 |
| Prestige Window Cleaners Ltd | Administrative & support | 2023 |
| Preston Solutions Limited | Professional & scientific | 1999 |
| PREVENT10DISEASES.CO.UK Ltd | Health & social care | 2022 |
| Principal Property Ltd | Information & communication | 2002 |
| Prism Light Solutions Ltd | Administrative & support | 2024 |
| Private Clients Services Ltd | Real estate | 2022 |
| Private Practice Associates Limited | Other services | 2007 |
| Privilege Security Services Limited | Administrative & support | 2024 |
| Pro Paintball Ltd | Arts & recreation | 2021 |
| Pro Scenery Ltd | Information & communication | 2022 |
| Proactive Performance Limited | Professional & scientific | 1997 |
| Product Principles Limited | Administrative & support | 2021 |
| Professional Assessment Limited | Education | 2014 |
| Proflo Solutions LLP | | 2015 |
| Programme Recruitment Limited | Administrative & support | 2002 |
| Project Consultancy London Ltd | Information & communication | 2014 |
| Project DBW LLP | | 2019 |
| Project Horizon Collective Ltd | Information & communication | 2025 |
| Project Sunflower Limited | Information & communication | 2014 |
| Projective Consultancy Ltd | Professional & scientific | 2015 |
| Projx Tech Ltd | Professional & scientific | 2015 |
| Proksch & Hewitt Limited | Information & communication | 2019 |
| Propel Business Solutions Ltd | Professional & scientific | 2026 |
| Property BUZ Ltd | Real estate | 2026 |
| Protect and Serve Limited | Wholesale & retail | 2025 |
| Protein Stable Limited | Manufacturing | 2019 |
| Pryml Apparel Limited | Wholesale & retail | 2017 |
| PS Associates Limited | Professional & scientific | 1995 |
| PS8 Limited | Administrative & support | 2008 |
| PSD Services Ltd | Manufacturing | 2019 |
| PSQ (Esher) Services Limited | Households | 2016 |
| PST Logic Limited | Information & communication | 2023 |
| PT Creative Limited | Professional & scientific | 2018 |
| Publisher Promotion Services Limited | Information & communication | 2016 |
| Puccino's M&M Leatherhead Ltd | Hospitality | 2022 |
| Pumadons Ltd | Information & communication | 2024 |
| Puralo Limited | Construction | 2014 |
| Purchase Group Limited | Professional & scientific | 2004 |
| Purchase Home Improvements Limited | Construction | 2008 |
| Purchase Homes Ltd. | Construction | 2011 |
| Purchase Support Limited | Administrative & support | 2008 |
| Purple Lily Ltd | Construction | 2025 |
| Putney G&G Limited | Construction | 2022 |
| Pyrate Rentals Ltd | Real estate | 2025 |
| Pyro & Co Agency Ltd | Arts & recreation | 2025 |
| Q C Pubs Limited | Hospitality | 2015 |
| Q Fire Protection & Carpentry Limited | Construction | 2018 |
| Q.E.D. Industrial Controls Limited | Wholesale & retail | 1974 |
| QED Education Environments Limited | Real estate | 1959 |
| QED Planning Limited | Administrative & support | 2016 |
| QR Contracts Ltd | Real estate | 2020 |
| Quality Telehandler Services Ltd | Construction | 2025 |
| Quantanglex Technologies Limited | Manufacturing | 2025 |
| Quantum Panda Limited | Information & communication | 2023 |
| Quapropter Limited | Information & communication | 2013 |
| Quarry Payroll Consulting Ltd | Professional & scientific | 2024 |
| Quarterbridge Consultancy Limited | Professional & scientific | 2017 |
| Qube Creative Services (UK) Limited | Professional & scientific | 2007 |
| Queensgate Management Cobham Limited | Households | 1990 |
| Quiet Bearing Ltd | Information & communication | 2025 |
| QUO Vadis Limited | Wholesale & retail | 2026 |