| Overlay Structures Ltd | Professional & scientific | 2017 |
| Override Fitness Ltd | Arts & recreation | 2021 |
| Owen Thomas Group Ltd | Administrative & support | 2025 |
| Owen Thomas Investments Ltd | Real estate | 2026 |
| Own IT. Finance Limited | Financial services | 2026 |
| Oxbrow Productions Ltd | Information & communication | 2020 |
| Oxford Hospitality Limited | Real estate | 2016 |
| OXY Enterprises Limited | Real estate | 2020 |
| OXY Holdings Limited | Financial services | 2020 |
| P4 Property Ltd | Real estate | 2026 |
| Paintedbyalice Ltd | Arts & recreation | 2025 |
| Paisley JAE Ltd | Administrative & support | 2023 |
| Park Lane America Holdings Limited | Financial services | 1978 |
| Parley Court Solar Park Limited | Energy | 2012 |
| Partnership Accumulation Limited | Administrative & support | 1999 |
| Patco Consulting Ltd | Financial services | 2023 |
| PCG Brands Ltd | Professional & scientific | 2026 |
| PCW Contracts Limited | Extraterritorial | 2008 |
| PCW Drain Services Limited | Construction | 2015 |
| PCW Drainage Limited | Construction | 2013 |
| PCW Group Limited | Financial services | 2021 |
| PCW Maintenance Limited | Extraterritorial | 2003 |
| PCW PRE FAB Limited | Professional & scientific | 2026 |
| Pears Homes Ltd | Real estate | 2019 |
| Pebble Ltd | Information & communication | 2007 |
| PEN Bryn OER Holdings Limited | Professional & scientific | 2016 |
| PEN Bryn OER Limited | Energy | 2012 |
| Penare Farm Solar Park Limited | Energy | 2012 |
| Pencoose Solar Limited | Energy | 2012 |
| Perfumers Guild Limited(The) | Extraterritorial | 1985 |
| Pernox Limited | Information & communication | 2026 |
| Personal Health and Fitness at Inspired Limited | Arts & recreation | 2015 |
| Pfi-Surv Limited | Real estate | 2020 |
| PFL Group (London) Limited | Transport & logistics | 2024 |
| Phcc (East London) Limited | Construction | 2004 |
| Phcc (Holdings) Limited | Financial services | 2018 |
| Phillip Chiverton Consultancy Ltd | Other services | 2023 |
| Pilton UK Holdings Limited | Financial services | 2023 |
| Pinnacle Acres Ltd | Real estate | 2023 |
| Pinnacle Homes Private Limited | Real estate | 2022 |
| Pioneer Build Ltd | Construction | 2025 |
| Pitch Yourself Perfect LLP | | 2026 |
| Pitsford Street Limited | Real estate | 2016 |
| Place Signal Limited | Information & communication | 2026 |
| Poland Developments Ltd | Construction | 2020 |
| Polaris Ventures Ltd | Construction | 2001 |
| Porque NO Ltd | Extraterritorial | 2014 |
| Power Coaching Limited | Education | 2018 |
| PP Property Services Ltd | Administrative & support | 2023 |
| PQS Solution Ltd | Construction | 2012 |
| Praxeon Digital Limited | Information & communication | 2025 |
| PRE OP Pro Ltd | Health & social care | 2025 |
| Precision CAD Design Limited | Professional & scientific | 2014 |
| Premier Construction Solutions Ltd | Construction | 2025 |
| Premiumlizzy Limited | Financial services | 2025 |
| Pretty Coverd Ltd | Wholesale & retail | 2024 |
| Pridham Services Limited | Professional & scientific | 2016 |
| Primary Health Care Centres (Facilities Management) Limited | Construction | 2004 |
| Primary Health Care Centres Limited | Construction | 1997 |
| Procare Services Limited | Construction | 2020 |
| Proffitt & Holt LLP | | 2020 |
| Proffitt & Holt Partnership Limited | Real estate | 2003 |
| Promultis Global Limited | Administrative & support | 2020 |
| Properties Direct Limited | Real estate | 2022 |
| Proptivity UK Ltd | Information & communication | 2024 |
| Propworks Studios Ltd | Manufacturing | 2023 |
| Prosource Assets UK Limited | Real estate | 2025 |
| Protos Security International Holdings Ltd | Administrative & support | 2024 |
| Provest Development Ltd | Construction | 2018 |
| Provest Investment Ltd | Real estate | 2025 |
| Pugsta Design Limited | Professional & scientific | 2011 |
| Purdy Legal Services Ltd. | Professional & scientific | 2018 |
| Pure Corporation Business Limited | Professional & scientific | 2021 |
| Pure International Limited | Manufacturing | 2016 |
| PWG Installations Limited | Manufacturing | 2023 |
| Quantica Surveying Services Ltd | Professional & scientific | 2025 |
| Quantrix Ltd | Professional & scientific | 2024 |
| R & R Online Media Ltd | Professional & scientific | 2009 |
| R Carrington Services Ltd | Public administration | 2025 |
| R G Structures Limited | Construction | 2022 |
| R2M Healthcare Solutions Limited | Professional & scientific | 2019 |
| Radar Edtech Limited | Education | 2020 |
| Rail Project Solutions Ltd | Professional & scientific | 2018 |
| Ramsey II Limited | Energy | 2012 |
| Ramsey Windfarm Limited | Energy | 2011 |
| RAR Medical Services Limited | Health & social care | 2013 |
| RAS Induk Ltd | Real estate | 2020 |
| Raytek Limited | Construction | 2015 |
| RDS of Pystonia Limited | Hospitality | 2013 |
| RDX Group Limited | Administrative & support | 2025 |
| Rebecca Ferguson Ltd | Extraterritorial | 2025 |
| Reboot Recruit Ltd | Administrative & support | 2020 |
| Recycling Supplies Limited | Transport & logistics | 2013 |
| Red Cars and Courier Services Limited | Transport & logistics | 2014 |
| Red Kite Securities Limited | Construction | 2011 |
| Red Office Solutions Limited | Administrative & support | 2004 |
| RED72 Performance Ltd | Arts & recreation | 2022 |
| Redwood Commerce Group Ltd | Wholesale & retail | 2026 |
| Reindeer Foods Limited | Wholesale & retail | 1980 |
| Reliable Property Maintenance Limited | Construction | 2019 |