| OYO Consultancy Ltd | Financial services | 2014 |
| OZ & MEM Ltd | Hospitality | 2025 |
| OZ Foods Colchester Ltd | Hospitality | 2019 |
| Ozun Ltd | Hospitality | 2015 |
| OZZ Platinum Properties Ltd | Real estate | 2024 |
| Ozzagli Platinum Holdings Ltd | Financial services | 2026 |
| Ozzie's Charcoal Kebab Ltd | Hospitality | 2023 |
| P & P Precision Designs Limited | Manufacturing | 2003 |
| P a Henery Developments Ltd | Construction | 2024 |
| P a Henery Ltd | Construction | 2017 |
| P C Tech Centre Limited | Wholesale & retail | 2002 |
| P&I Real Estate Limited | Real estate | 2024 |
| P&K Design Property Limited | Real estate | 2021 |
| P&P MOT Servicing Limited | Manufacturing | 2008 |
| P.A.N Property Maintenance Services Ltd | Construction | 2026 |
| P.D. Star DRY Cleaners Limited | Other services | 2007 |
| P.P.E. Limited | Manufacturing | 2017 |
| Paddyhome Ltd | Construction | 2021 |
| Padelogy Limited | Arts & recreation | 2025 |
| Padms Ltd | Construction | 2026 |
| PAE Associates Ltd | Administrative & support | 2020 |
| Paediatric Surgeon London Limited | Health & social care | 2019 |
| Painkiller Ltd | Hospitality | 2025 |
| Palliser Homes Ltd | Real estate | 2018 |
| Palm Court Management Co. Limited | Households | 1988 |
| Palmcuisine Ltd | Hospitality | 2022 |
| Palmer Mccarthy LLP | | 2001 |
| Pamu Ltd | Professional & scientific | 2022 |
| Panema Construction Services Ltd | Construction | 2023 |
| Panglobal Education Limited | Education | 2024 |
| Panomy Consultancy Ltd | Information & communication | 2018 |
| Papa Jaans Ltd | Hospitality | 2026 |
| Papayo Ltd | Wholesale & retail | 2020 |
| Papilio One Ltd | Hospitality | 2025 |
| Papworth Garden Design Ltd | Professional & scientific | 2018 |
| PAR Engineering Services Limited | Construction | 2006 |
| PAR Investments Limited | Financial services | 2014 |
| Paradise Weddings Worldwide Limited | Real estate | 2017 |
| Paragraph Tech Ltd | Construction | 2024 |
| Parcel Recovery Bikes Limited | Transport & logistics | 2019 |
| Parcel Recovery Solution Ltd | Transport & logistics | 2016 |
| Parcel Recovery Vans Limited | Administrative & support | 2019 |
| Parfit Limited | Construction | 1996 |
| Parmar Properties Investment Ltd | Real estate | 2025 |
| Parsons Green Sushi Ltd | Hospitality | 2018 |
| Partnered Digital Ltd | Professional & scientific | 2024 |
| Partspanel Limited | Wholesale & retail | 1996 |
| Party Popper Productions Ltd | Arts & recreation | 2026 |
| Passion for Detail Ltd | Wholesale & retail | 2020 |
| Patel Group Holding Limited | Financial services | 2022 |
| Patel Group Limited | Professional & scientific | 2019 |
| Patel Group Properties Limited | Real estate | 2022 |
| Patens & Co Limited | Professional & scientific | 2009 |
| Patens Associates Limited | Professional & scientific | 2018 |
| Patron Electrical Ltd | Construction | 2019 |
| Patton Consultancy Services Ltd | Information & communication | 2012 |
| Paul and Ravin Ltd | Health & social care | 2026 |
| Paul Fizia Associates Ltd | Extraterritorial | 2009 |
| Paul Still Valeting Suppliers Ltd | Wholesale & retail | 2010 |
| Paula C Mendiguchia Ltd | Professional & scientific | 2021 |
| Pauline (South Croydon) Limited | Real estate | 1939 |
| PAY Direct Ltd | Financial services | 2026 |
| PB Educational & Travel Advisory Services Ltd | Professional & scientific | 2023 |
| PB GAS Heating & Plumbing Ltd | Construction | 2025 |
| PB Pumps & Motors (London) Limited | Administrative & support | 2007 |
| PBL Associates Ltd | Professional & scientific | 2011 |
| PC Repairs Croydon Limited | Information & communication | 2008 |
| PCL Marketing Limited | Professional & scientific | 2012 |
| PDM Chauffeur Limited | Transport & logistics | 2025 |
| Peaches&Co Ltd | Hospitality | 2015 |
| Pear Plus Limited | Information & communication | 2006 |
| Pearce House Healthcare Limited | Health & social care | 2024 |
| Peculiar Corp CIC | Wholesale & retail | 2025 |
| Pedro Sajini International Ltd | Information & communication | 2022 |
| Pelican RF CIC | Health & social care | 2026 |
| Pembroke Gardens Management Company Limited | Households | 2011 |
| Pendeen Resources Limited | Financial services | 2008 |
| People Edge Ltd | Professional & scientific | 2009 |
| People Works Solutions Ltd | Real estate | 2025 |
| Perchance Consulting Ltd. | Information & communication | 2019 |
| Percom Financial Services Limited | Financial services | 2020 |
| Perfect Interiors Ltd | Construction | 2022 |
| Performance Food Limited | Administrative & support | 2002 |
| Perpet'Ual Universal Limited | Hospitality | 1998 |
| Personal Business Travel Management Ltd | Administrative & support | 2017 |
| Personnel Cleaners Limited | Administrative & support | 2008 |
| Peter James Jones TV Ltd | Information & communication | 2017 |
| Petrochem Procurement & Marketing Ltd | Real estate | 2013 |
| PFC Addiscombe Ltd | Wholesale & retail | 2018 |
| PG Luxury Ltd | Transport & logistics | 2019 |
| PH Property Investments Limited | Real estate | 2023 |
| Pharrell Ltd | Transport & logistics | 2021 |
| Philpark Ltd | Construction | 2008 |
| Phoenix International Investments Limited | Construction | 2017 |
| Phoenix Pro Limited | Administrative & support | 2022 |
| Phomax Limited | Professional & scientific | 2023 |
| Phonetastic UK Ltd | Other services | 2020 |
| Phosphenes of London Ltd | Professional & scientific | 2014 |
| Physiotherapy Exercise and Rehab Solutions Limited | Health & social care | 2014 |
| Picky Bits Food Limited | Hospitality | 2022 |