| Panoconstruct Ltd | Construction | 2021 |
| Papa Kitchen Essex Limited | Hospitality | 2018 |
| Papaver Services Limited | Construction | 2024 |
| Papc Ltd | Construction | 2025 |
| Papercupexpress Limited | Administrative & support | 2022 |
| Parallel London Limited | Administrative & support | 2018 |
| Park Rise Holdings Limited | Real estate | 2015 |
| Park Rise Ventures Holdings Limited | Financial services | 2019 |
| Parker Power Ltd | Construction | 2025 |
| Parts Galore International Limited | Wholesale & retail | 2025 |
| Pass Essex Limited | Education | 2026 |
| Pass IT on (Property) Limited | Real estate | 2020 |
| Passive House Systems Ltd | Construction | 2015 |
| Patmac (UK) Ltd | Information & communication | 2007 |
| Patovi Energy Limited | Administrative & support | 2010 |
| Patwary Limited | Real estate | 2013 |
| Paul Adams Accounting Ltd | Professional & scientific | 2017 |
| Paul Saggers Associates Limited | Professional & scientific | 2009 |
| Paws’N’Cures Ltd | Wholesale & retail | 2025 |
| Pearl & Co Trading Ltd | Construction | 2025 |
| Peckard Investment Limited | Other services | 2015 |
| Peerlink Ltd | Professional & scientific | 2026 |
| Pegasus Energy Consulting LLP | | 2017 |
| Pegdp Ltd | Financial services | 2024 |
| Pegs Lane Leasehold Limited | Real estate | 2025 |
| Pelekan Advisory Services Limited | Professional & scientific | 1996 |
| Pelham Enterprises Limited | Education | 2012 |
| Pellys Hair Lounge Ltd | Other services | 2025 |
| Pennbron Digital Ltd | Information & communication | 2019 |
| Pennbron Ecommerce Limited | Wholesale & retail | 2018 |
| Penny Lane Cleaning Co Ltd | Administrative & support | 2024 |
| People Partners International Limited | Professional & scientific | 2023 |
| Perfect Pc's Limited | Information & communication | 2004 |
| Performance Square Limited | Professional & scientific | 2018 |
| Perrian Builders Limited | Construction | 2012 |
| Peter Manning Associates Limited | Professional & scientific | 1993 |
| Peter Neubauer Homes Limited | Construction | 2006 |
| Petersfield Solutions Ltd | Administrative & support | 2020 |
| Petro Construction Ltd | Construction | 2019 |
| PH Training Services Limited | Other services | 2012 |
| Phat Ltd | Information & communication | 2008 |
| Photoquote Ltd | Information & communication | 2026 |
| Phycel Resources Limited | Wholesale & retail | 2024 |
| Pioneer Aesthetics Ltd | Health & social care | 2026 |
| Pipe Scaffolding Limited | Construction | 2011 |
| Pitstone Aviation Ltd | Transport & logistics | 2022 |
| Pivot Brand and Marketing Ltd | Professional & scientific | 2026 |
| Piya Epping Ltd | Hospitality | 2024 |
| Piya Kitchen Ltd | Hospitality | 2020 |
| PK Medical Services Ltd | Health & social care | 2025 |
| PK Motors & Supply Solutions Ltd | Transport & logistics | 2021 |
| Pkss Holdings Ltd | Financial services | 2025 |
| Plane Trader Ltd | Extraterritorial | 2022 |
| Plia Ltd | Information & communication | 2020 |
| Plot Perfect Studios Ltd | Information & communication | 2024 |
| PMT Flat & Formed Limited | Manufacturing | 2016 |
| Podium Creative Enterprise Ltd | Administrative & support | 2014 |
| Polestar Pilates UK Limited | Real estate | 1996 |
| Polished Koncrete Limited | Information & communication | 2009 |
| Poole Properties (London) Limited | Real estate | 2000 |
| Pope Audio Ltd | Manufacturing | 2021 |
| Popili Limited | Manufacturing | 2021 |
| Popin Nursery Schools Ltd | Education | 2024 |
| Poptex Limited | Hospitality | 2019 |
| Portfolio Property Investments Ltd | Real estate | 2016 |
| Posse London Ltd | Professional & scientific | 2021 |
| Possiblepeople Ltd | Public administration | 2025 |
| Power Audio Ltd | Information & communication | 2014 |
| Power Promotion Limited | Professional & scientific | 2009 |
| POWER2GO Ltd | Construction | 2026 |
| Powerlift Equipments Rental and Trading Ltd | Wholesale & retail | 2025 |
| PPC Finance Ltd | Administrative & support | 2018 |
| PR Sports Management Limited | Other services | 2021 |
| Prash Web Design Limited | Information & communication | 2024 |
| PRB Building Services Limited | Construction | 1991 |
| Precision Property Ltd | Real estate | 2025 |
| Premier Concrete Pumping Limited | Administrative & support | 1983 |
| Premium Care Group Limited | Health & social care | 2021 |
| Premium Care Homes Limited | Health & social care | 2021 |
| Premium Care Properties Limited | Health & social care | 2021 |
| Premium Machine Leasing Limited | Administrative & support | 2006 |
| Press & Multi-Slide Tooling Limited | Manufacturing | 2002 |
| Prestige Logistics Group Ltd | Transport & logistics | 2019 |
| Prestige Motoring World Ltd | Administrative & support | 2020 |
| Prime Grocers Ltd | Wholesale & retail | 2025 |
| Prime Reach Media Ltd | Professional & scientific | 2026 |
| Prime Time Distribution Ltd | Professional & scientific | 2020 |
| Primodial Services Limited | Health & social care | 2025 |
| Prism Financial Ltd | Financial services | 2016 |
| Pro Fire Safe Ltd | Construction | 2025 |
| Pro Surv Properties Limited | Real estate | 2024 |
| Procomply Transport Ltd | Professional & scientific | 2023 |
| Procostmetrics Ltd | Professional & scientific | 2023 |
| Producer Phillips Limited | Information & communication | 2016 |
| Professional and Medical Financial Planning Limited | Financial services | 2005 |
| Professional AV Limited | Construction | 2009 |
| Professional Housing Stock Surveying Limited | Professional & scientific | 2013 |
| Propal Limited | Wholesale & retail | 1979 |
| Property Management National UK Ltd | Real estate | 2020 |
| Prosmart Wheels Ltd | Wholesale & retail | 2018 |