| Prosper Care Limited | Health & social care | 2025 |
| Prosperer Northwest Ltd | Hospitality | 2019 |
| Prosperify Ltd | Information & communication | 2022 |
| Prosperio Limited | Real estate | 2023 |
| Prosperita Consulting Ltd | Wholesale & retail | 2019 |
| Prosperitea Ltd | Manufacturing | 2020 |
| Prosperity Chinese Restaurant Ltd | Hospitality | 2016 |
| Prosperity Investments Limited | Real estate | 2018 |
| Prosperity Matters Limited | Education | 2011 |
| Prosperity Property Group NW Ltd | Real estate | 2026 |
| Prosperway OVH Ltd | Hospitality | 2025 |
| Protea Construction Ltd | Administrative & support | 2014 |
| Protean Advisory Ltd | Professional & scientific | 2025 |
| Protec Plastics Suppliers Limited | Transport & logistics | 2007 |
| Protec Supplies Ltd | Wholesale & retail | 2023 |
| Protec Systems Ltd | Administrative & support | 2026 |
| Protech Commercial Limited | Administrative & support | 2019 |
| Protech Lighting & Digital Ltd | Professional & scientific | 2023 |
| Protect Roofing Ltd | Construction | 2020 |
| Protective Steering Limited | Manufacturing | 2021 |
| Proteinium Limited | Administrative & support | 2017 |
| Protenancy & Builders Clean Ltd | Administrative & support | 2025 |
| Protiaso Ltd | Manufacturing | 2012 |
| Protium Research Limited | Professional & scientific | 2018 |
| Protocol 360 Ltd | Administrative & support | 2016 |
| Proton Electrical Solutions Limited | Construction | 2023 |
| Proton for Transport Services Ltd | Transport & logistics | 2024 |
| Protostem-Ai Limited | Professional & scientific | 2024 |
| Provecta Healthcare Ltd | Health & social care | 2024 |
| Provenance Partners Limited | Wholesale & retail | 2010 |
| Provenio Law Limited | Professional & scientific | 2018 |
| Provenio Litigation LLP | | 2018 |
| Provent Installations Ltd | Construction | 2025 |
| Providence Life CIC | Information & communication | 2026 |
| Providence Properties Ltd | Real estate | 2020 |
| Provident Limited | Health & social care | 2026 |
| Providential Electrical Services Ltd | Construction | 2021 |
| Province Properties Limited | Real estate | 2024 |
| Provix Ltd | Information & communication | 2021 |
| Provsec Ltd | Construction | 2008 |
| Prowise Consultancy Ltd | Information & communication | 2016 |
| Prowse Phillips Law Limited | Professional & scientific | 2015 |
| Prprty Solutions Ltd | Real estate | 2025 |
| Prr&Co Limited | Wholesale & retail | 2015 |
| PRS Telecom Limited | Information & communication | 2003 |
| PRT Properties Limited | Real estate | 2022 |
| Prudent Care 24 Ltd | Administrative & support | 2022 |
| Prudent Construction Limited | Construction | 2017 |
| Prudent Property Ltd | Real estate | 2011 |
| Prudentia Education Limited | Education | 2016 |
| Pruno Wines Ltd | Wholesale & retail | 2018 |
| PRW Holdings Ltd | Financial services | 2020 |
| Prymed Limited | Transport & logistics | 2002 |
| Pryzm Corporation Ltd | Professional & scientific | 2019 |
| PS Couture Ltd | Wholesale & retail | 2020 |
| PS Electrical Consultancy Limited | Construction | 2017 |
| PS GAS and Plumbing Services Limited | Construction | 2019 |
| PS Groundworks Limited | Construction | 2025 |
| PS Hotel Limited | Construction | 2020 |
| PS Plumbing & Bathrooms Specialist Limited | Construction | 2018 |
| PS Promotions Ltd | Arts & recreation | 2024 |
| PS Properties NW Ltd | Real estate | 2024 |
| Psalmsmed Ltd | Transport & logistics | 2022 |
| PSC Global Holdings Ltd | Financial services | 2025 |
| PSC Hospitality Ltd | Hospitality | 2025 |
| Pscscs Ltd | Hospitality | 2024 |
| PSD Property Enterprises Limited | Real estate | 2022 |
| PSH Law Limited | Professional & scientific | 2020 |
| PSI Global (Rail) Limited | Administrative & support | 2019 |
| PSI Global Construction & Engineering Limited | Administrative & support | 2019 |
| PSI Global Construction Limited | Construction | 2021 |
| PSI Global Group Limited | Administrative & support | 2017 |
| PSI Global Industrial Services Limited | Administrative & support | 2020 |
| PSI Global KMG Limited | Administrative & support | 2026 |
| PSI Global Major Projects Limited | Administrative & support | 2018 |
| PSI Global Professional Limited | Administrative & support | 2020 |
| PSI Global Projects Limited | Administrative & support | 2023 |
| PSI Global Safety Solutions Limited | Administrative & support | 2023 |
| PSI Global Scaffolding Limited | Administrative & support | 2021 |
| PSI Global Training Limited | Professional & scientific | 2023 |
| Psia Consulting Ltd | Information & communication | 2014 |
| PSL (Liverpool) Limited | Professional & scientific | 2001 |
| PSL (Weir) Ltd | Wholesale & retail | 1930 |
| PSL Engineers Ltd | Professional & scientific | 2023 |
| PSL International Holdings Limited | Professional & scientific | 2016 |
| PSM Electrical Contractors Ltd | Construction | 2012 |
| PSM Stays Ltd | Real estate | 2025 |
| PSR Facilities Ltd | Extraterritorial | 2023 |
| PSS (UK) | Health & social care | 1926 |
| PSS Commercial Services Limited | Health & social care | 2008 |
| PSS Specialist Engineering Ltd | Professional & scientific | 2016 |
| PST Property Ltd | Real estate | 2025 |
| Pstc Group Ltd | Education | 2011 |
| Pstokesjdot Limited | Transport & logistics | 2025 |
| PSW Automation & Control Limited | Professional & scientific | 2018 |
| Psycho Beach Villas Limited | Households | 1991 |
| Psychological Therapy Online Limited | Health & social care | 2013 |
| Psychology Grounded Ltd | Public administration | 2018 |
| Psychology Links Limited | Education | 2014 |
| Psychology Street Initiatives Ltd. | Professional & scientific | 2011 |