| Prosperhome Limited | Construction | 1978 |
| Prosperity Consultancy Ltd | Other services | 2016 |
| Prosperity Project CIC | Information & communication | 2025 |
| Proswing Ltd | Wholesale & retail | 2024 |
| Protea (Europe) Limited | Professional & scientific | 2005 |
| Proteasa Construct Ltd | Construction | 2023 |
| Protech Finishing Limited | Manufacturing | 2007 |
| Protech Management Consulting Limited | Professional & scientific | 2025 |
| Protection Papi Ltd | Financial services | 2020 |
| Protectionx Group Limited | Administrative & support | 2025 |
| Proteros Data Systems Limited | Wholesale & retail | 2005 |
| Protest Building and Maintenance Solutions Limited | Extraterritorial | 2016 |
| Protest Compliance Group Ltd. | Construction | 2020 |
| Protest Electrical Services Limited | Construction | 2020 |
| Protest ES Limited | Other services | 2009 |
| Proteus Leisure Ltd | Hospitality | 1998 |
| Protrack Limited | Manufacturing | 2023 |
| Proud Landscapes Limited | Administrative & support | 2012 |
| Proudway Investments Limited | Real estate | 2008 |
| Provauto Ltd | Professional & scientific | 2025 |
| Provenance Consulting Limited | Professional & scientific | 2013 |
| Provence PR Ltd | Transport & logistics | 2016 |
| Providence Bay Group Ltd | Hospitality | 2019 |
| Providence Collection Services Limited | Administrative & support | 2024 |
| Provimet Ltd | Information & communication | 2020 |
| Provision Legal Services Limited | Manufacturing | 2001 |
| Provolt Solutions Ltd | Construction | 2026 |
| Proweldco Limited | Manufacturing | 2015 |
| Prowess Electrical Solutions Ltd | Construction | 2019 |
| Proxy Managed Services Ltd | Financial services | 2015 |
| PRS OX Limited | Real estate | 2021 |
| Prudent Electrical Limited | Construction | 2014 |
| Prudent Strategies Investments Limited | Real estate | 2022 |
| Prudent Strategies Limited | Professional & scientific | 2017 |
| Prudentia and Sons Limited | Health & social care | 2015 |
| Pruven Data Solutions Limited | Information & communication | 2025 |
| PRV Accounting Ltd | Professional & scientific | 2022 |
| Prvconstructions Ltd | Construction | 2016 |
| Pryde IT Consulting Limited | Information & communication | 2015 |
| Prying Eyes Productions Ltd | Information & communication | 2024 |
| Pryzm Ventures Ltd | Wholesale & retail | 2023 |
| PS Design Solutions Limited | Administrative & support | 2003 |
| PS Northampton Limited | Real estate | 2017 |
| PSA Care Limited | Health & social care | 2018 |
| PSC Capital Ltd | Real estate | 2024 |
| PSG Timbers Ltd | Manufacturing | 2014 |
| Pshinde Ltd | Information & communication | 2022 |
| PSJ Housing Ltd | Real estate | 2021 |
| PSK Medical Ltd | Health & social care | 2019 |
| PSK Solution Ltd | Transport & logistics | 2025 |
| PSM Stores Ltd | Transport & logistics | 2020 |
| Psma Ltd | Health & social care | 2024 |
| Psopo Limited | Professional & scientific | 2016 |
| PSV Interiors Limited | Construction | 2022 |
| PSY Logistic Limited | Transport & logistics | 2015 |
| Psychology and Finance at Work Limited | Professional & scientific | 2002 |
| PT Flex Ltd | Arts & recreation | 2024 |
| PT Professional Services Ltd | Information & communication | 2025 |
| PT Workspace Milton Keynes Ltd | Arts & recreation | 2022 |
| PTG Advisory Limited | Professional & scientific | 2021 |
| PTS Internal Solutions Ltd | Construction | 2015 |
| Public Practice Recruitment (Interim) Ltd | Administrative & support | 2016 |
| Public Practice Recruitment Ltd | Administrative & support | 2014 |
| Public Sector Poetry CIC | Information & communication | 2021 |
| Pugs MTB Ltd | Wholesale & retail | 2022 |
| Puhlo Limited | Wholesale & retail | 2024 |
| Pulickakunnel Ltd | Real estate | 2023 |
| Pulsario UK Limited | Financial services | 2023 |
| Pulse Automation Ltd | Construction | 2022 |
| Pulse Healthcare Solutions Ltd | Health & social care | 2024 |
| Pulse IT Recruitment Ltd | Professional & scientific | 2014 |
| Pulse Spark Electrical Ltd | Construction | 2024 |
| Pulsetech Audio Solutions Limited | Administrative & support | 2025 |
| Pumako Limited | Real estate | 2023 |
| Punjab Catering Foods UK Limited | Hospitality | 2015 |
| Punjaban Events Ltd | Hospitality | 2019 |
| Punjaban Limited | Manufacturing | 2015 |
| Pupebitz Ltd | Wholesale & retail | 2020 |
| Puppy Yoga Northants Ltd | Other services | 2025 |
| PURCHASE2 Limited | Professional & scientific | 2015 |
| Purdey Lorimer Limited | Administrative & support | 2008 |
| Pure Aesthetic Solutions Ltd | Health & social care | 2012 |
| Pure Deliveries Ltd | Transport & logistics | 2019 |
| Pure Ground Landscapes Limited | Administrative & support | 2015 |
| Pure Health by DR Emilia Ivan Ltd | Wholesale & retail | 2026 |
| Pure IT Services Ltd | Information & communication | 2006 |
| Pure Medical Aesthetics Clinic Ltd | Health & social care | 2008 |
| Pure Pantry Market Ltd | Hospitality | 2024 |
| Pure Procurement Limited | Professional & scientific | 2018 |
| Pure Scented Limited | Extraterritorial | 2021 |
| Pure Space Cleaners Ltd | Administrative & support | 2025 |
| Pure Telecoms Ltd | Information & communication | 2008 |
| Pure Water Pools Limited | Construction | 2022 |
| Purely Digital Services Limited | Information & communication | 2016 |
| Puremotion Physiotherapy Limited | Health & social care | 2012 |
| Purepac Ltd | Administrative & support | 2012 |
| Pureplan Limited | Construction | 2007 |
| Purexs Capital Limited | Financial services | 2025 |
| Purifuel Ltd | Professional & scientific | 2024 |
| Purley Services Limited | Professional & scientific | 2010 |