| Primal Design Ltd | Manufacturing | 2024 |
| Prime Hire Limited | Administrative & support | 2018 |
| Prime North Property Limited | Real estate | 2024 |
| Prime Painting AC Ltd. | Construction | 2018 |
| Prime Pantry Ltd | Hospitality | 2026 |
| Prime Trims Limited | Wholesale & retail | 2016 |
| Prime Trims London Ltd | Wholesale & retail | 2014 |
| Prime Vehicle Sales (Sawtry) Ltd | Wholesale & retail | 2022 |
| Primero Intermediaries & Football Agency Ltd | Administrative & support | 2023 |
| Primetax Accountancy Limited | Professional & scientific | 2025 |
| Primo KIT Limited | Professional & scientific | 2018 |
| Primrose Alliance Ltd | Professional & scientific | 2024 |
| Pringle Farm Estates Ltd | Hospitality | 2019 |
| Pringle Farm Land Limited | Real estate | 2019 |
| Pringle Farm Mews Residents' Management Ltd | Households | 2025 |
| Printed Clothing Ltd | Wholesale & retail | 2004 |
| Prints of Extinction Limited | Arts & recreation | 2025 |
| Priority Communications Limited | Information & communication | 1996 |
| Priority First AID Limited | Education | 2014 |
| Priory Agricultural Contractors Limited | Agriculture & fishing | 2013 |
| Priory Mews Management Company Limited | Households | 1984 |
| Priory Place (Thetford) Management Company Limited | Households | 1989 |
| Pristine Automotive Limited | Wholesale & retail | 2013 |
| Priyam Real Estates Limited | Real estate | 2025 |
| PRJ Management Limited | Professional & scientific | 2013 |
| Prkr Solutions Limited | Professional & scientific | 2025 |
| Pro Serve Solutions Ltd | Transport & logistics | 2019 |
| Pro-Race Exhaust Systems Limited | Manufacturing | 2023 |
| Procare Cleaning Management (London) Limited | Administrative & support | 1998 |
| Produce Inspectors of Europe UK Limited | Hospitality | 2015 |
| Produlcis Limited | Administrative & support | 2017 |
| Project Abundance UK C.I.C. | Agriculture & fishing | 2023 |
| Project Design & Development Engineers Limited | Administrative & support | 1999 |
| Project Tortoise Limited | Financial services | 2025 |
| PROJECT1983 Ltd | Construction | 2019 |
| Prometheus TEC Ltd | Information & communication | 2025 |
| Promiscuous Ltd | Information & communication | 2014 |
| Promofos Ltd | Administrative & support | 2014 |
| Propco Holding Co Limited | Real estate | 2016 |
| Propco Property Limited | Real estate | 2018 |
| Propco Tile Co Limited | Real estate | 2014 |
| Property by Buben Ltd | Real estate | 2020 |
| Property Care Consulting Limited | Professional & scientific | 2025 |
| Property Hive Group Ltd | Financial services | 2024 |
| Propertyrefurb London Ltd | Construction | 2015 |
| Proright Infra PVT Ltd | Information & communication | 2017 |
| Protect FS Limited | Financial services | 2017 |
| Protect OR Detect Security Services Ltd | Information & communication | 2018 |
| Protein 4 U Ltd | Other services | 2022 |
| Provisualizer Ltd | Arts & recreation | 2021 |
| Proxes UK & Ireland Limited | Wholesale & retail | 2015 |
| Pryu Solutions Ltd | Information & communication | 2022 |
| PSW Management Ltd | Professional & scientific | 2015 |
| PT Fast Food Ltd | Hospitality | 2026 |
| PT Takeaway Ltd | Hospitality | 2024 |
| PTF Production Limited | Arts & recreation | 2017 |
| Ptswasteclearance Ltd | Water & waste | 2026 |
| PUB Corp Limited | Hospitality | 2022 |
| Puckering Sports Inflatables Limited | Manufacturing | 2024 |
| Puff U.K. Limited | Manufacturing | 2022 |
| Pulzia Ltd | Administrative & support | 2024 |
| Punta Nero Limited | Professional & scientific | 2020 |
| Purchase IT Online Limited | Wholesale & retail | 2019 |
| Pure BIM Ltd | Professional & scientific | 2021 |
| Purify UK Private Limited | Wholesale & retail | 2023 |
| Purple Horizons Community CIC | Administrative & support | 2026 |
| Purple Patch Training Ltd. | Financial services | 2010 |
| Pusula Ltd. | Wholesale & retail | 2013 |
| Puzzle Technology Ltd | Information & communication | 2016 |
| PVK Granite & Marble Limited | Construction | 2016 |
| Pvssportline Ltd | Wholesale & retail | 2022 |
| PZ Composites Ltd | Manufacturing | 2014 |
| Pzaslice Ltd | Hospitality | 2025 |
| Qaramd Ltd | Professional & scientific | 2024 |
| Qodesh Limited | Wholesale & retail | 2022 |
| QR Properties Limited | Real estate | 2018 |
| QSS Direct Ltd | Construction | 2011 |
| Quad Electroacoustics Limited | Manufacturing | 1978 |
| Quadmore Limited | Administrative & support | 2023 |
| Quantaforge Ltd | Manufacturing | 2025 |
| Quantcog Ltd. | Information & communication | 2022 |
| Quantified Silver Ltd | Professional & scientific | 2025 |
| Quantum Defence Ltd | Information & communication | 2023 |
| Quantx Solutions Ltd | Information & communication | 2016 |
| Quarry Temp Solutions Ltd | Administrative & support | 2018 |
| Quartflight Limited | Real estate | 1989 |
| Quin Industries Limited | Manufacturing | 2013 |
| Quokka 'N Roll Creations Ltd | Arts & recreation | 2018 |
| Quoktech Ltd | Manufacturing | 2025 |
| Qwerty IT Services Limited | Information & communication | 2014 |
| QXP Associates Ltd | Professional & scientific | 2019 |
| R & L Farming LLP | | 2006 |
| R & R Housden (Builders) Limited | Construction | 2004 |
| R & S Clark Farming Ltd | Agriculture & fishing | 2019 |
| R Crawford Building Services Limited | Construction | 2003 |
| R D Hudson & Sons Limited | Construction | 2003 |
| R D Williams & Sons (Haulage) Limited | Transport & logistics | 1971 |
| R Radford Limited | Administrative & support | 2018 |
| R T Joinery Services Limited | Manufacturing | 2004 |
| R W Gardening Limited | Administrative & support | 2020 |