| Page Turners Media Ltd | Information & communication | 2025 |
| Panoptica Films Ltd | Information & communication | 2019 |
| Parallel Sound Ltd | Information & communication | 2022 |
| Parkes Display & Expo Ltd | Manufacturing | 2024 |
| Parkes Group Holdings Ltd | Financial services | 2024 |
| Parrott Carpentry Contractors Limited | Manufacturing | 2015 |
| Paugun Ltd | Real estate | 2025 |
| Paul Revill Comedy Limited | Arts & recreation | 2014 |
| PBC Catering Services Limited | Hospitality | 2011 |
| PCR Developments Limited | Real estate | 1999 |
| PCR Family Holdings Limited | Financial services | 2003 |
| PDS Corp Ltd | Professional & scientific | 2026 |
| Peckway Limited | Wholesale & retail | 2018 |
| Pegasus Mews Management Company Limited | Administrative & support | 2003 |
| Peledex Ltd | Administrative & support | 2020 |
| Penguin Properties (Lettings & Management) Ltd | Real estate | 2014 |
| Peppers Foods Ltd | Hospitality | 2025 |
| Peramiho Limited | Professional & scientific | 2011 |
| Performance Pass Competitions Ltd | Wholesale & retail | 2026 |
| Periasta Dining Limited | Hospitality | 2019 |
| Periasta Limited | Hospitality | 2017 |
| Periasta Takeaway Limited | Hospitality | 2019 |
| Peter Imray Senta Limited | Other services | 2012 |
| Petforia Ltd | Wholesale & retail | 2023 |
| PFC Digital Ltd | Information & communication | 2023 |
| Pfeffer Ltd | Administrative & support | 2011 |
| PGH Builders Ltd | Construction | 2024 |
| Pharmalinx Ltd | Professional & scientific | 2008 |
| Pheonix-One Security Services Limited | Administrative & support | 2024 |
| PHL Hydraulics UK Limited | Construction | 2019 |
| Phlite Ltd | Information & communication | 2011 |
| Phoenix Consortium Ltd | Manufacturing | 2019 |
| Phoenix Industrial Doors Limited | Extraterritorial | 1996 |
| Pictures of Lily Limited | Other services | 2020 |
| Pimm Pictures Ltd | Information & communication | 2023 |
| Pinchy Ltd | Arts & recreation | 2023 |
| Pixel Whisperer Ltd | Information & communication | 2018 |
| Pizza Master Biggleswade Ltd | Hospitality | 2026 |
| PJ Arnold Haulage Ltd | Transport & logistics | 2019 |
| PJ Gilchrist General Building Ltd | Construction | 2017 |
| Planet Gardening Investments Limited | Professional & scientific | 2019 |
| Planet Gardening Limited | Agriculture & fishing | 2018 |
| Planet Gardening Retail Limited | Wholesale & retail | 2019 |
| Platinum Close Management Company Limited | Households | 2022 |
| PLAY9AT5 Ltd | Arts & recreation | 2019 |
| Playa Digital Ltd | Information & communication | 2019 |
| Pledger Interiors Ltd | Construction | 2022 |
| Plum Financial Solutions Limited | Financial services | 2009 |
| Plumred Limited | Information & communication | 2011 |
| Point 1 Lighting Limited | Construction | 2017 |
| Pointy Stick Ltd | Arts & recreation | 2025 |
| Pola Technical Solutions Ltd | Information & communication | 2017 |
| Polytope Ltd | Professional & scientific | 2020 |
| Poor Little Rich Girl Limited | Arts & recreation | 2023 |
| Poppies Nursery Limited | Health & social care | 2004 |
| Poreham Management Limited | Financial services | 2020 |
| Positive Community Mindset CIC | Education | 2014 |
| Potters Bar Garage Ltd | Wholesale & retail | 2016 |
| Potton Road Management Company Limited | Households | 2016 |
| Pragmatic Screen Support Ltd | Information & communication | 2024 |
| Precise Design Solutions Ltd | Construction | 2025 |
| Preen Community Interest Company | Wholesale & retail | 2007 |
| Pressengine Group Limited | Professional & scientific | 2021 |
| Prestige Tool Hire Ltd | Administrative & support | 2025 |
| Priory Fields Properties Limited | Real estate | 1995 |
| Priya Farish Holdings Ltd | Professional & scientific | 2022 |
| Prodrive Solutions Limited | Real estate | 2017 |
| Profect Marketing Ltd | Information & communication | 2021 |
| Project XIV Limited | Professional & scientific | 2018 |
| Proval Services Limited | Financial services | 1992 |
| Provider Limited | Extraterritorial | 1996 |
| PS External Doors Ltd | Construction | 2023 |
| PSA Audio Visual Ltd | Administrative & support | 2018 |
| PSL Engineering Consultancy Ltd | Professional & scientific | 2022 |
| PSP Electrical Services Limited | Construction | 1998 |
| Psychology Resources Ltd | Health & social care | 2021 |
| PT Building & Conversions Limited | Construction | 2020 |
| Publimentor Ltd | Information & communication | 2025 |
| Pure 7'S Limited | Wholesale & retail | 2023 |
| Pure Personnel Limited | Administrative & support | 2012 |
| Pyramid Laboratory Limited | Manufacturing | 2015 |
| Qcss Resources Ltd | Professional & scientific | 2019 |
| R and R Heating and Plumbing Ltd | Construction | 2021 |
| R and R Heating and Plumbing Supplies Ltd | Wholesale & retail | 2024 |
| R M Ventilation Limited | Construction | 2007 |
| R S Heaps Ltd | Construction | 2013 |
| Rachel Eccles Design Ltd | Professional & scientific | 2024 |
| Rae-On Productions Limited | Arts & recreation | 2021 |
| Rainy Sun on Cloud Limited | Information & communication | 2019 |
| RAJ Cafe Limited | Hospitality | 2022 |
| RAJ Connext Ltd | Hospitality | 2024 |
| Rare Rubies Ltd | Information & communication | 2017 |
| Rare Rubies Properties Ltd | Real estate | 2024 |
| Ravden Automotive Ltd | Wholesale & retail | 2025 |
| Raymond Limited | Information & communication | 2026 |
| RCD 42 Limited | Professional & scientific | 2012 |
| RCT Construction Services Ltd | Construction | 2020 |
| RDG DRY Lining Ltd | Construction | 2019 |
| Ready Ready Productions Ltd | Professional & scientific | 2013 |
| Rebike Ltd | Wholesale & retail | 2026 |