| Propertylink London Limited | Real estate | 2005 |
| Propshift Ltd | Real estate | 2020 |
| Proset Ltd | Wholesale & retail | 2021 |
| Proshine END of Tenancy Cleaning Ltd | Administrative & support | 2026 |
| Prosper Housing Limited | Real estate | 2005 |
| Prospera Property Management Ltd | Real estate | 2026 |
| Prosperdeal Finance Limited | Real estate | 2010 |
| Prosperitas Lettings Ltd | Real estate | 2025 |
| PROSPERITAS7 Limited | Information & communication | 2009 |
| Prospexa Property Services Ltd | Other services | 2024 |
| Prosthetic Consultancy Ltd | Manufacturing | 2022 |
| Protesyn Ltd | Professional & scientific | 2025 |
| Protesyn Studio Ltd | Professional & scientific | 2025 |
| Protex Construction Limited | Construction | 1998 |
| Proud SAM Ltd | Wholesale & retail | 2024 |
| Providence Dental Limited | Health & social care | 2007 |
| Prowebb Limited | Information & communication | 2024 |
| Prowess SR Limited | Professional & scientific | 2025 |
| Proxima UK Limited | Construction | 2015 |
| Prpa UK Ltd | Wholesale & retail | 2026 |
| PRS Locum Ltd | Professional & scientific | 2018 |
| PRS Property Investments Limited | Real estate | 2025 |
| Prsub Ltd | Hospitality | 2024 |
| Prvw Consulting Ltd | Professional & scientific | 2026 |
| Przemojoiner Ltd | Construction | 2023 |
| PS Brick Block & Home Improvement Ltd | Construction | 2019 |
| PS Imports & Exports Company Ltd | Wholesale & retail | 2025 |
| PS NIK Ltd | Construction | 2026 |
| PS4 Services Limited | Construction | 2025 |
| PSM Consultancy Limited | Information & communication | 2009 |
| PSM Painting and Decorating Ltd | Construction | 2025 |
| PSM Portfolio Limited | Administrative & support | 2015 |
| PSP Actuarial Ltd | Professional & scientific | 2023 |
| PST Food UK Ltd | Extraterritorial | 2020 |
| PST Suvaicholai Ltd | Hospitality | 2025 |
| Psuchi Associates Ltd | Professional & scientific | 2021 |
| Psychologise Limited | Other services | 2009 |
| PTA Consultancy Limited | Professional & scientific | 2010 |
| PTA Investments Ltd | Financial services | 2021 |
| PTA Property Ltd | Real estate | 2021 |
| PTP Contractors Limited | Construction | 2003 |
| PUB India Limited | Hospitality | 1998 |
| Pudding Doree Limited | Manufacturing | 2025 |
| Pudding Dorée London Limited | Manufacturing | 2025 |
| Puffersoft Limited | Information & communication | 2019 |
| Pulsegrid Ltd | Information & communication | 2025 |
| Pumpapp Ltd | Wholesale & retail | 2010 |
| Punchdrunk Enrichment Limited | Arts & recreation | 2002 |
| Punchdrunk Enrichment Productions Limited | Arts & recreation | 2010 |
| Punihani Ltd | Construction | 2021 |
| Purav Capital Ltd | Real estate | 2021 |
| Purbrook Practice Limited | Real estate | 2006 |
| Pure PK Ltd | Information & communication | 2026 |
| Pure Signs Limited | Other services | 2018 |
| Purebond Limited | Other services | 1991 |
| Purely Aqua Limited | Manufacturing | 2024 |
| Pureringo Ltd | Administrative & support | 2019 |
| Puresense Limited | Real estate | 2006 |
| Purewellth Ltd | Health & social care | 2025 |
| Purple DRÉ Community Interest Company | Education | 2024 |
| Purple Property Management Limited | Real estate | 2019 |
| Purple Web Consulting Ltd | Professional & scientific | 2010 |
| Purplewood Properties Limited | Construction | 2020 |
| Purtish Goods Ltd | Wholesale & retail | 2025 |
| PVB Project Management Limited | Administrative & support | 2014 |
| PVS Food Limited | Hospitality | 2025 |
| PW Boxing Ltd | Other services | 2023 |
| PWS Recycling Ltd | Water & waste | 2025 |
| Pybp Ltd | Professional & scientific | 2025 |
| Pyramid Builders Developments Limited | Construction | 2006 |
| Pyramid Builders Limited | Construction | 1994 |
| Pyramid Health Group Limited | Financial services | 2024 |
| Pyramids of Builders Ltd | Construction | 2016 |
| Python Ltd | Wholesale & retail | 2018 |
| Q Estates Limited | Hospitality | 1997 |
| Q&M Sisters Limited | Real estate | 2023 |
| Q'S Kitchen Limited | Hospitality | 2019 |
| Q'S Tutors Ltd | Education | 2026 |
| Qadir LLP | | 2025 |
| QAF Studio Ltd | Real estate | 2025 |
| Qafsr Ltd | Hospitality | 2024 |
| Qasri Shahri NAW Restaurant Ltd | Hospitality | 2026 |
| Qcoders Ltd | Information & communication | 2011 |
| QI Network Limited | Professional & scientific | 2019 |
| Qijie Ascent Ltd | Manufacturing | 2025 |
| Qin's Investments Ltd | Real estate | 2021 |
| Qingfu HGF Ltd | Wholesale & retail | 2025 |
| Qinshuhua Ltd | Wholesale & retail | 2024 |
| QJ Trading Ltd | Administrative & support | 2023 |
| Qlik Solutions Limited | Information & communication | 2014 |
| Qlova Ltd | Professional & scientific | 2015 |
| QP Capital 1 Ltd | Real estate | 2022 |
| QP Property Ltd | Administrative & support | 2014 |
| Qstep Limited | Professional & scientific | 2011 |
| Qstyle Tailoring & Embroidery Ltd | Manufacturing | 2020 |
| Qtech (UK) Limited | Information & communication | 2013 |
| QU Nova Limited | Information & communication | 2025 |
| Quadruple a Ltd | Real estate | 2025 |
| Quadtrade Limited | Transport & logistics | 2015 |
| Quality Cameras Ltd | Professional & scientific | 2019 |