| Pro Skin Medical Aesthetics Ltd | Health & social care | 2022 |
| Pro Tuning Automotive Ltd | Administrative & support | 2022 |
| Proactive Investors Limited | Other services | 2005 |
| Proactive Project Management Ltd | Construction | 2024 |
| Proadvance Properties Ltd | Real estate | 2024 |
| Probate Wills and Trust Services Ltd | Other services | 2017 |
| Probuild Aircraft Ltd | Administrative & support | 2002 |
| Proclin Limited | Professional & scientific | 2016 |
| Prodem Reclamation Ltd | Construction | 2017 |
| Productcraft Ltd | Information & communication | 2025 |
| Produxity Ltd | Information & communication | 2022 |
| Profectus Continua Limited | Professional & scientific | 2022 |
| Professional Analytics Engineering Limited | Information & communication | 2024 |
| Professional Link Solutions Ltd | Wholesale & retail | 2020 |
| Professional Partners Administration Limited | Financial services | 2011 |
| Professor Leaper Limited | Health & social care | 2010 |
| Profusive Trading Ltd | Hospitality | 2019 |
| Progutter Ltd | Manufacturing | 2013 |
| Project Cloud Ltd | Professional & scientific | 2019 |
| Project Verma Limited | Professional & scientific | 2025 |
| Project-Amg- Ltd | Wholesale & retail | 2020 |
| Prolific Project Solutions Ltd | Information & communication | 2018 |
| Prometheus Digital Limited | Information & communication | 2025 |
| Prompt Parcels Ltd | Transport & logistics | 2025 |
| Propagation Partners Limited | Professional & scientific | 2026 |
| Property Angel Investments Ltd | Real estate | 2022 |
| Property Notices Hold Co Ltd | Financial services | 2026 |
| Proprius Investments Limited | Construction | 2018 |
| Prosparks Electrical Ltd | | 2007 |
| Prospect Sports Limited | Arts & recreation | 2025 |
| Proteas Risk Management Ltd | Professional & scientific | 2017 |
| Protectu Fire & Security Ltd | Administrative & support | 2025 |
| Protelum Partners Limited | Administrative & support | 2020 |
| Provalis Consulting Limited | Information & communication | 2020 |
| Prove Consulting Limited | Information & communication | 2017 |
| Provenance Data Risk Partners Limited | Professional & scientific | 2024 |
| Prymathia Limited | Information & communication | 2024 |
| PS Gilbert Consultancy Ltd | Arts & recreation | 2015 |
| PS People Matter Limited | Professional & scientific | 2024 |
| Psocialite Ltd | Information & communication | 2018 |
| PST Developments Ltd. | Construction | 2013 |
| Psyght Solutions Limited | Professional & scientific | 2016 |
| PTD IT Consulting Ltd | Information & communication | 2025 |
| Ptjs Holdings Ltd | Financial services | 2022 |
| Public Assembly Ltd | Professional & scientific | 2021 |
| Publishing Solutions (W.W.W.) Limited | Information & communication | 1999 |
| Pulchra Limited | Professional & scientific | 2001 |
| Pulford Publicity Limited | Information & communication | 2003 |
| Purbeck Logistical Services Limited | Transport & logistics | 2014 |
| Purdy Jewell Ventures Limited | Administrative & support | 2017 |
| Pure & Clean Ltd | Administrative & support | 2013 |
| Pure Drop Water Systems Management Ltd | Water & waste | 2016 |
| Pure GAS Heating Ltd | Construction | 2014 |
| Pure Heating and Electrical Limited | Real estate | 2023 |
| Pure Heating Services Limited | Construction | 2023 |
| Pure Star Dance Limited | Education | 2005 |
| Pureqa Limited | Information & communication | 2025 |
| Purley Plastics Limited | Manufacturing | 2013 |
| Purple HR Limited | Administrative & support | 2010 |
| Purpose & Growth Advisory Ltd | Professional & scientific | 2026 |
| Purpose Care Ltd | Health & social care | 2026 |
| Purrfect Paws Boarding Cattery Ltd | Other services | 2019 |
| Putnam Concepts Ltd | Professional & scientific | 2018 |
| PVM Projects Ltd | Professional & scientific | 2024 |
| Pwned Data Intelligence Ltd | Information & communication | 2024 |
| PX3 Consulting Ltd | Professional & scientific | 2018 |
| PY Solutions Ltd | Information & communication | 2023 |
| PYE Corner Management Limited | Households | 1996 |
| Pythonick Ltd | Information & communication | 2025 |
| QA 365 Limited | Information & communication | 2024 |
| QDC Ltd | Information & communication | 2016 |
| QJP Limited | Wholesale & retail | 2023 |
| Qmidas Limited | Construction | 2019 |
| Qontrol Ltd | Information & communication | 2025 |
| QR Memorial Memories Limited | Other services | 2025 |
| Qraft Lighting Limited | Wholesale & retail | 2019 |
| Qualitas Homes Ltd | Real estate | 2011 |
| Qualitas Logistics Limited | Transport & logistics | 2021 |
| Qualitas Test Management Limited | Information & communication | 2012 |
| Quant BEE Ltd | Information & communication | 2015 |
| Quantalis Limited | Professional & scientific | 2025 |
| Quantcom Limited | Information & communication | 2019 |
| Quantech Consulting UK Ltd | Information & communication | 2023 |
| Quantified Limited | Construction | 2022 |
| Quantomatix Ltd | Information & communication | 2025 |
| Quantum M & D Ltd | Extraterritorial | 2011 |
| Quantum Marketing (Europe) Limited | Professional & scientific | 2013 |
| Quantum Quantity Surveying Services Ltd | Professional & scientific | 2022 |
| Quantumfusion Labs UK PV Ltd | Information & communication | 2024 |
| Quartier Limited | Professional & scientific | 2004 |
| Quartleys Property Ltd | Real estate | 2024 |
| Quartz Student Properties Limited | Hospitality | 2020 |
| Quati Limited | Professional & scientific | 2013 |
| Quay Fabrication Limited | Manufacturing | 2016 |
| Quay Pilot Project Limited | Education | 2014 |
| Quay Yachting Limited | Wholesale & retail | 2023 |
| Queen Elizabeth's Court Residents Association Limited | Households | 1983 |
| Queensmead Management Company Limited | Households | 1976 |
| Quest Clearance & Services Ltd | Water & waste | 2015 |
| Quest EPM Ltd | Information & communication | 2023 |