| Pine Restaurant Group Limited | Hospitality | 2016 |
| Pinhurst Limited | Construction | 1972 |
| Pink Grapefruit Property Limited | Real estate | 2017 |
| Pinkwell Estates Ltd | Real estate | 2023 |
| Pinnacle Brickwork Ltd | Construction | 2014 |
| Pinnacle Foods Limited | Manufacturing | 2007 |
| Pioneer Growth Solutions Ltd | Agriculture & fishing | 2025 |
| Piper Building Services (UK) Ltd | Other services | 2014 |
| Pipin' Hot Ltd | Construction | 2026 |
| Piril Sideras Aesthetics & Skin Sanctuary Ltd | Health & social care | 2018 |
| Piril Sideras Consultancy Limited | Professional & scientific | 2025 |
| Pirpa Barnet Ltd | Wholesale & retail | 2025 |
| PJZ Parenting Limited | Health & social care | 2017 |
| PL13 Ltd | Wholesale & retail | 2022 |
| Plan for Safety Consultancy Ltd | Administrative & support | 2014 |
| Planet H C Ltd | Hospitality | 2025 |
| Plannr Technologies Limited | Information & communication | 2021 |
| Plants Hunters Ltd | Administrative & support | 2023 |
| Playback Limited | Information & communication | 2015 |
| Plester Square Ltd | Other services | 2023 |
| Plexipave (UK) Limited | Administrative & support | 2006 |
| Plotline Limited | Information & communication | 2025 |
| Plumb and Drain Company Ltd | Construction | 2024 |
| Plumbing & Heating 24/7 Ltd | Construction | 2017 |
| PM Heating & General Maintenance Ltd | Construction | 2010 |
| PMJ Corporation Limited | Professional & scientific | 2024 |
| Pneuma Audio Ltd | Information & communication | 2022 |
| Poenta Limited | Information & communication | 2023 |
| Polat & Sons Properties Limited | Real estate | 2025 |
| Polished London Marble Limited | Administrative & support | 2017 |
| Polygona Ltd | Information & communication | 2020 |
| Pom-Data Ltd | Information & communication | 2018 |
| Pomario Ltd | Extraterritorial | 2011 |
| Poorna Ltd | Real estate | 2019 |
| Popa Family Ltd | Wholesale & retail | 2018 |
| Popes Meadow (Luton) Management Company Ltd | Real estate | 2023 |
| Popsie and Co Limited | Wholesale & retail | 2017 |
| Porisov Investments Limited | Real estate | 2013 |
| Postcard Properties Limited | Real estate | 2015 |
| Postech Investments Limited | Real estate | 2018 |
| Potters Press Limited | Real estate | 1921 |
| Powerahead Limited | Construction | 2001 |
| Powerical Ltd | Construction | 2020 |
| Powerslider Ltd | Professional & scientific | 2025 |
| PP Property Developments Limited | Real estate | 2017 |
| PPL Resources Limited | Professional & scientific | 2025 |
| PQW Brenley Corner Limited | Health & social care | 2007 |
| Practically Natural Limited | Construction | 2011 |
| Prad Properties Ltd | Real estate | 2024 |
| Precious Box Ltd | Arts & recreation | 2019 |
| Precision Prescribing Ltd | Administrative & support | 2026 |
| Premier Engines Ltd | Wholesale & retail | 2024 |
| Premium Padel Sales Limited | Arts & recreation | 2025 |
| Prestige Cars International Ltd | Wholesale & retail | 2024 |
| Prestige Home Services Ltd | Administrative & support | 2021 |
| Prestige Security Hertfordshire Limited | Administrative & support | 2026 |
| Prestige Security London Limited | Administrative & support | 2026 |
| Prestige Tanning Limited | Other services | 2023 |
| Prestine Lift Installations and Repairs Ltd | Manufacturing | 2016 |
| Pretium Advisory (UK) Limited | Professional & scientific | 2018 |
| Price Management Consultancy Ltd | Professional & scientific | 2019 |
| Pride UK (DQM) Limited | Transport & logistics | 2019 |
| Primal Strength Nutrition Ltd | Wholesale & retail | 2025 |
| Primal Strength Physiotherapy Ltd | Other services | 2024 |
| Prime and Piper Ltd | Wholesale & retail | 2025 |
| Prime Care Givers Ltd | Health & social care | 2024 |
| Prime Food Supplies Ltd | Wholesale & retail | 2023 |
| Prime Healthcare Solutions Ltd | Administrative & support | 2022 |
| Prime Lifestyle Limited | Administrative & support | 2011 |
| Prime Progression Limited | Real estate | 2021 |
| Prime Property Repairs Ltd | Construction | 2026 |
| Prime Training and Consultancy Ltd | Administrative & support | 2025 |
| Primech Group Ltd | Construction | 2021 |
| Prince Choice UK Limited | Other services | 2020 |
| Princepak Limited | Other services | 2019 |
| Principa Limited | Professional & scientific | 2002 |
| Principle Home Maintenance Ltd | Construction | 2019 |
| Prink Studios Ltd | Other services | 2022 |
| Print Plan Ltd | Manufacturing | 2022 |
| Printzel Design & Print Ltd | Manufacturing | 2021 |
| Priors Court (Cheshunt) RTM Company Limited | Real estate | 2020 |
| Pristine Wholesale Ltd | Other services | 2020 |
| Privacy Properties Limited | Real estate | 2008 |
| Proaccountax Services Ltd | Professional & scientific | 2021 |
| Proactive Nutrition Network Limited | Education | 2025 |
| Proassess Ltd | Health & social care | 2023 |
| Production Holdings Limited | Administrative & support | 2023 |
| Professional Health Solutions Ltd | Health & social care | 2013 |
| Project Affordable Ltd | Wholesale & retail | 2019 |
| Promach Property Solutions Ltd | Financial services | 2020 |
| Promax London Ltd | Wholesale & retail | 2022 |
| Prompt Local Courier Services Limited | Transport & logistics | 2022 |
| Propel Training Academy Ltd | Education | 2024 |
| Proper Old Ltd | Wholesale & retail | 2011 |
| Proper Pups Ltd | Other services | 2025 |
| Properties and Consulting Limited | Real estate | 2019 |
| Property by R.M Thomas Ltd | Real estate | 2020 |
| Property Marketing Hub Ltd | Real estate | 2020 |
| Property Media Marketing Ltd | Information & communication | 2017 |
| Property People Recruitment Limited | Administrative & support | 2004 |