| Progroup Construction Trustee Limited | Financial services | 2024 |
| Project & Management Consultancy Limited | Construction | 2010 |
| Project Aria Bidco Limited | Financial services | 2021 |
| Project Aria Midco 1 Limited | Financial services | 2021 |
| Project Aria Midco 2 Limited | Financial services | 2021 |
| Project Aria Topco Limited | Financial services | 2021 |
| Project Construction Group Limited | Construction | 2021 |
| Project Design Studio Limited | Professional & scientific | 1996 |
| Project Detail Ltd | Extraterritorial | 2025 |
| Project Management Global Ltd | Information & communication | 2024 |
| Project Management Solutions MK Ltd | Construction | 2024 |
| Project Performer Limited | Professional & scientific | 2014 |
| Project Rewards Limited | Professional & scientific | 2023 |
| Projectcraft Limited | Professional & scientific | 2012 |
| Projectedge Consulting Limited | Information & communication | 2026 |
| Projex Hospitality Ltd | Hospitality | 2023 |
| Prokleen UK Limited | Administrative & support | 2003 |
| Prokom IT Limited | Information & communication | 2008 |
| Proleads Alliance Ltd | Administrative & support | 2024 |
| Prolex Ltd | Professional & scientific | 2017 |
| Prolificat Limited | Information & communication | 2011 |
| Prolocate Ltd | Real estate | 2021 |
| Prologic Systems Limited | Construction | 2014 |
| Prometheus GRP Ltd | Construction | 2019 |
| Promic Brays Properties Ltd | Real estate | 2025 |
| Promic Financial Services Limited | Financial services | 2023 |
| Promida London Limited | Wholesale & retail | 2025 |
| Prominent Media Ltd | Information & communication | 2003 |
| Promotiqs Ltd | Extraterritorial | 2016 |
| Prompt Resource Ltd | Administrative & support | 2022 |
| Pronature Limited | Professional & scientific | 2013 |
| Pronto Dynamic Limited | Wholesale & retail | 2022 |
| Pronto Pizza (Milton Keynes) Limited | Hospitality | 2016 |
| Proof Accelerator C.I.C. | Health & social care | 2024 |
| Prop 3 Ltd | Real estate | 2018 |
| PROP2 Ltd | Real estate | 2018 |
| Propartee Ltd | Real estate | 2021 |
| Propasun Ltd | Other services | 2024 |
| Propel Coaching Limited | Professional & scientific | 2024 |
| Proper Aesthetics Limited | Health & social care | 2012 |
| Proper Marketing Limited | Hospitality | 2018 |
| Properties by FH Limited | Real estate | 2025 |
| Properties DXK LLP | | 2022 |
| Property Connect (East Midland) Ltd | Real estate | 2016 |
| Property Developers Academy Limited | Education | 2023 |
| Property Direct Management Ltd | Real estate | 2018 |
| Property Directors Ltd | Professional & scientific | 2016 |
| Property Essentials Limited | Extraterritorial | 2006 |
| Property Grid Ltd | Real estate | 2015 |
| Property Holdings UK Group Limited | Professional & scientific | 2020 |
| Property Interconnect Ltd | Real estate | 2024 |
| Property Investment Providers Limited | Construction | 2000 |
| Property Lord Ltd | Construction | 2025 |
| Property Network Media Limited | Other services | 2004 |
| Property Pillars Limited | Information & communication | 2017 |
| Property Plant Investments Ltd | Real estate | 2016 |
| Property RTS Limited | Real estate | 2025 |
| Property Services JDM Ltd | Real estate | 2018 |
| Property Steps Ltd | Extraterritorial | 2013 |
| Property Streamed Limited | Real estate | 2019 |
| Property Success Education Ltd | Education | 2024 |
| Property Trenders Limited | Real estate | 2023 |
| Propertymk Ltd | Real estate | 2018 |
| Propietas LLP | | 2005 |
| Propiteer Planning & Development 3 Limited | Real estate | 2018 |
| Proplanningconsultant Ltd | Professional & scientific | 2025 |
| Proptpilot Ltd | Information & communication | 2025 |
| Proqrement Ltd | Wholesale & retail | 2019 |
| Proraima Ltd | Construction | 2019 |
| Proscenic EU Ltd | Wholesale & retail | 2019 |
| Proship Logistics Ltd | Wholesale & retail | 2020 |
| Prosignals UK Limited | Administrative & support | 2018 |
| Prosky Holdings Limited | Financial services | 2017 |
| Prosman Ltd | Health & social care | 2022 |
| Prospect 66 Limited | Other services | 2023 |
| Prospect Print Ltd | Manufacturing | 2020 |
| Prospectingx Ltd | Information & communication | 2025 |
| Prospects Pulse Ltd | Professional & scientific | 2026 |
| Prosper Digital Technology Ltd | Wholesale & retail | 2025 |
| Prosperity Associates (UK) Limited | Financial services | 2009 |
| Prosperity Global Partners Ltd | Professional & scientific | 2024 |
| Protech Project and Technical Management Limited | Professional & scientific | 2001 |
| Protective Covers Limited | Manufacturing | 2020 |
| Protexx (UK) Limited | Financial services | 2005 |
| Protocol Medic Care Limited | Health & social care | 2026 |
| Protospace CIC | Information & communication | 2025 |
| Protrade Direct Supplies Ltd | Wholesale & retail | 2025 |
| Protrade Windows Limited | Manufacturing | 2025 |
| Proud Brickworks Ltd | Construction | 2025 |
| PROV35 Management Ltd | Administrative & support | 2022 |
| Provide Consulting Group Limited | Administrative & support | 2011 |
| Provide London Ltd | Administrative & support | 2009 |
| Provide Medical Ltd | Administrative & support | 2009 |
| Providence Here Ltd | Other services | 2020 |
| Providence Property Investments Limited | Real estate | 2022 |
| Provident Lettings Ltd | Real estate | 2016 |
| Providentia Energy Limited | Wholesale & retail | 2018 |
| Provine Regulatory Ltd | Professional & scientific | 2008 |
| Provit Solutions Limited | Information & communication | 2012 |
| Prowess Holdings Limited | Financial services | 2023 |