| Project Edge Midco 1 UK Limited | Financial services | 2025 |
| Project Edge Midco 2 UK Limited | Financial services | 2025 |
| Project Edge UK Topco Limited | Financial services | 2025 |
| PROJECT27 Consultancy Group C.I.C. | Education | 2023 |
| Projectionist Pictures Limited | Information & communication | 1998 |
| Prominence Ltd | Real estate | 2007 |
| Proper Delivery Ltd | Transport & logistics | 2022 |
| Property Incorporated Limited | Construction | 2022 |
| Property Plus Lettings Limited | Real estate | 2013 |
| Propertyfinder Dema Limited | Other services | 2008 |
| Proplex Limited | Real estate | 2023 |
| Prosafe Electrical Ltd | Construction | 2019 |
| Prospect Kent Limited | Real estate | 2023 |
| PROSPECT2KENT Ltd | Other services | 2025 |
| Prosper Business Development Ltd | Professional & scientific | 2018 |
| Prospera Property Group Limited | Real estate | 2026 |
| Prosus Limited | Construction | 2005 |
| Protech Electrical Global Limited | Construction | 2024 |
| Protel (Professional Telecoms) Solutions Limited | Information & communication | 2004 |
| Proterms Limited | Information & communication | 2018 |
| Protran Garage Limited | Wholesale & retail | 2013 |
| Provida Ltd | Information & communication | 2017 |
| Proximal Games Ltd | Information & communication | 2022 |
| Prycie Limited | Professional & scientific | 2017 |
| PS Financial Advisers Limited | Financial services | 2003 |
| PSR Enterprises Ltd | Wholesale & retail | 2018 |
| Psych.Communications Ltd | Health & social care | 2021 |
| Psychologists International Ltd | Health & social care | 2020 |
| Psychology Experts Limited | Health & social care | 2007 |
| Psychology Partners Ltd | Health & social care | 2026 |
| PTC Arts Academy CIC | Education | 2024 |
| PUB DE Ganso Ltd | Hospitality | 2025 |
| PUB LEG Holdings Limited | Financial services | 2023 |
| PUB LEG Limited | Hospitality | 2010 |
| Public-I Group Limited | Information & communication | 2000 |
| Puglia Holiday Rentals Ltd | Hospitality | 2009 |
| Pull Back Camera Ltd. | Information & communication | 2000 |
| Pumpkin Patch Nurseries Ltd | Health & social care | 2003 |
| Pumpkin Patch Steyning Limited | Health & social care | 2022 |
| Punch and Roll Ltd | Information & communication | 2020 |
| Punchline PR Limited | Professional & scientific | 2005 |
| Purdy & Associates Ltd | Professional & scientific | 2020 |
| Pure BIO Limited | Wholesale & retail | 2015 |
| Pure Health Limited | Financial services | 1997 |
| Pure Manufacturing Limited | Manufacturing | 2014 |
| Pure Mushrooms | Wholesale & retail | 2026 |
| Pure Natural Solutions Ltd | Wholesale & retail | 2022 |
| Pure White Associates Limited | Information & communication | 2010 |
| Purmön Digital Ltd | Professional & scientific | 2022 |
| Pursuit of Progress Ltd | Education | 2025 |
| Putensen Properties Limited | Real estate | 2014 |
| Putnam Construction Limited | Construction | 2016 |
| Puzzle Architecture Limited | Professional & scientific | 2022 |
| PWM Translations Limited | Information & communication | 2005 |
| PWS Invest Limited | Real estate | 2020 |
| PWX Construction Ltd | Construction | 2021 |
| Pymas & SON Limited | Real estate | 2009 |
| Pyrmont Wealth Management (UK) Limited | Professional & scientific | 2021 |
| Pyromania Fireplaces Limited | Construction | 2003 |
| Pyrospect Ltd | Public administration | 2023 |
| Q Street Restaurant Ltd | Hospitality | 2020 |
| QC Adelmo Limited | Energy | 2025 |
| QC Aymaro Limited | Energy | 2021 |
| QC Basker Limited | Energy | 2025 |
| QC Canice Limited | Energy | 2024 |
| QC Clonmac Limited | Energy | 2025 |
| QC Cronan Limited | Energy | 2024 |
| QC Dervla Limited | Energy | 2024 |
| QC Magnus Limited | Energy | 2023 |
| QC Montferrat Limited | Energy | 2023 |
| QC Morimondo Limited | Energy | 2023 |
| QC Otranto Limited | Energy | 2023 |
| QC Pacificus Limited | Energy | 2022 |
| QC Senan Limited | Energy | 2024 |
| QC Ubertino Limited | Energy | 2022 |
| QC Venantius Limited | Energy | 2025 |
| QC Waldo Limited | Energy | 2022 |
| QC Whepstead Limited | Energy | 2022 |
| Qclear Ltd | Professional & scientific | 2020 |
| QED Structures Ltd | Professional & scientific | 2005 |
| Qinsky Accounting Services Limited | Professional & scientific | 2020 |
| QMT Ltd | Wholesale & retail | 2019 |
| QORE5 UK Limited | Information & communication | 2022 |
| Qssi Limited | Wholesale & retail | 2014 |
| QTP (Brighton) Limited | Professional & scientific | 2009 |
| Quad 7 Limited | Households | 2001 |
| Quad Vehicle Consultants Limited | Education | 2001 |
| Quadlings Limited | Households | 1996 |
| Quadrant Dental Practice Limited | Health & social care | 2017 |
| Quadrivium Dental Limited | Financial services | 2023 |
| Quadrophenia Alley Clothing Limited | Wholesale & retail | 2019 |
| Quaff-Ee Bags Limited | Wholesale & retail | 2020 |
| Quality Care Business Solutions Ltd | Administrative & support | 2017 |
| Quality Care Corporate Ltd | Administrative & support | 2014 |
| Quality Care Insurance Services Limited | Administrative & support | 2009 |
| Quality Care Utilities Ltd | Other services | 2020 |
| Quantac Limited | Real estate | 1985 |
| Quantisoft Limited | Information & communication | 2014 |
| Quantity Surveying Subcontractors Ltd | Professional & scientific | 2023 |
| Quantron UK Limited | Information & communication | 2025 |