| Primrose Hill Dentosophy Ltd | Health & social care | 2016 |
| Principle Property Management Limited | Real estate | 2012 |
| Print Demon Holdings Limited | Professional & scientific | 2013 |
| Print Demon Systems Limited | Information & communication | 2000 |
| Prior House Management Company Limited | Households | 2000 |
| Prior Knowledge Ltd | Professional & scientific | 2019 |
| Priory EM Limited | Real estate | 2020 |
| Priory Property Ltd | Real estate | 2021 |
| Pristine Gutters Limited | Administrative & support | 2020 |
| Pritchard and Pritchard Limited | Administrative & support | 2014 |
| Pritchard and Pritchard Maintenance Ltd | Administrative & support | 2023 |
| Pro Master Roofing Ltd | Construction | 2025 |
| Proctech Ltd | Professional & scientific | 2022 |
| PRODUCTACTIV8 Limited | Information & communication | 2024 |
| Productiva Group UK Ltd | Information & communication | 2021 |
| Productive Strategy Limited | Administrative & support | 2015 |
| Proextra Ltd | Professional & scientific | 2018 |
| Profectus Enterprise Limited | Administrative & support | 2017 |
| PROGRESS2IMPACT Ltd | Information & communication | 2020 |
| Progressive Developments Limited | Real estate | 2021 |
| Progressive Energy Solutions Limited | Professional & scientific | 2024 |
| Project 105 Ltd | Real estate | 2019 |
| Project Invicta Limited | Energy | 2024 |
| Project Plants Limited | Extraterritorial | 2012 |
| Project Tulip Topco Limited | Financial services | 2016 |
| Prolog Management Limited | Information & communication | 1980 |
| PROLOGI8 Limited | Information & communication | 2011 |
| Prometheanix Limited | Professional & scientific | 2013 |
| Proodos Impact Capital Ltd | Financial services | 2019 |
| Proper Teas Properties Ltd | Real estate | 2025 |
| Property & Commercial Residential Limited | Real estate | 2020 |
| Property & Projects Ltd | Construction | 2017 |
| Property Advisors Limited | Real estate | 2022 |
| Property and Commercial Investments Limited | Financial services | 2020 |
| Property and Development Solutions Ltd | Real estate | 2025 |
| Propharma Group MIS Holdings Limited | Information & communication | 2013 |
| Propharma Group MIS Limited | Information & communication | 1998 |
| Propharma Group UK Ltd | Administrative & support | 2001 |
| Propolingo Publishing Ltd | Information & communication | 2019 |
| Proppass Limited | Information & communication | 2025 |
| Proshield Ltd | Financial services | 2026 |
| Prosource Worldwide Limited | Professional & scientific | 2003 |
| Prospects Recruitment & Personnel Solutions Limited | Professional & scientific | 2010 |
| Proteco Limited | Construction | 2025 |
| Protect Law Limited | Professional & scientific | 2021 |
| Providence Capital Partners Limited | Financial services | 2015 |
| Provincial Inns Limited | Professional & scientific | 1973 |
| PS Deals Ltd | Wholesale & retail | 2016 |
| PSA Wholesale Ltd | Wholesale & retail | 2020 |
| Psycho Cleaning Ltd | Administrative & support | 2024 |
| Psychological Medicine Consultants Limited | Health & social care | 2001 |
| PT Trustees Limited | Financial services | 2011 |
| Public Whisper Limited | Information & communication | 2016 |
| Publish My Book Limited | Information & communication | 2023 |
| Puddingpotlids Ltd | Manufacturing | 2022 |
| Pulse Markets Group Ltd | Information & communication | 2026 |
| Purberry Shot(Management)Limited | Households | 1959 |
| Puretrack Developments Limited | Construction | 2017 |
| Purgistics Limited | Administrative & support | 2003 |
| Purpl Pulse Ltd | Information & communication | 2026 |
| Purple Creative Services Limited | Information & communication | 2009 |
| Purple Healthcare Solutions Limited | Information & communication | 2020 |
| Purple Numbers Limited | Professional & scientific | 2023 |
| PVC Builders Solutions Ltd | Manufacturing | 2025 |
| PW Agriculture Limited | Agriculture & fishing | 2025 |
| PWD Roofing Solutions Ltd | Construction | 2025 |
| Pyrol Investco Ltd | Financial services | 2025 |
| Pyrol Manco Ltd | Financial services | 2024 |
| Q Design Group Ltd | Financial services | 2018 |
| Q Design House Ltd | Professional & scientific | 2018 |
| Q Entertainment Ltd | Information & communication | 2025 |
| Q Gardener Limited | Administrative & support | 2024 |
| Q-Style Limited | Manufacturing | 1999 |
| Q.I. Financial Planning Limited | Administrative & support | 2013 |
| Q1BUILDERS Ltd | Construction | 2017 |
| Q22026LWL Ltd | Wholesale & retail | 2018 |
| Q2Q Communications Limited | Administrative & support | 1994 |
| Q2Q Group Limited | Financial services | 2020 |
| Q2Q UK LLP | | 2009 |
| Qaisan Ltd | Health & social care | 2022 |
| Qauto Global Limited | Financial services | 2026 |
| Qcollective Limited | Hospitality | 2020 |
| QE3 Ltd | Arts & recreation | 2019 |
| Qmunity Ltd | Professional & scientific | 2024 |
| Qrsn Ltd | Other services | 2018 |
| Quality Compliance Systems Ltd | Other services | 2007 |
| Quality Quest Consultancy Limited | Information & communication | 2015 |
| Quality Spirits International Limited | Wholesale & retail | 1986 |
| Qualsoft Software Consultants Limited | Information & communication | 1996 |
| Quarry Family Office Limited | Financial services | 2026 |
| Quartet Capital Partners LLP | | 2009 |
| Quartz Automotive Services Limited | Transport & logistics | 2018 |
| Quartz Media Limited | Administrative & support | 2003 |
| Quasar Enterprises Limited | Professional & scientific | 2009 |
| Quaves Cliography Limited | Information & communication | 2024 |
| QUB 10 Ltd | Information & communication | 2024 |
| Quest Travel Limited | Administrative & support | 2008 |
| Quick Pitch Ltd | Information & communication | 2025 |
| Quickfall Concepts Ltd | Construction | 2025 |
| Quickspark Electrical Ltd | Extraterritorial | 2019 |