| Positive Futures Recruitment Ltd | Administrative & support | 2019 |
| POT Contracting Ltd | Other services | 2018 |
| Potarine Ltd | Professional & scientific | 2026 |
| Power Lift UK Limited | Administrative & support | 2000 |
| Powerful Partners Limited | Construction | 2003 |
| PPL Electrical Services Ltd | Manufacturing | 2010 |
| Practical Edge Ltd | Professional & scientific | 2025 |
| Pravad Ltd | Other services | 2018 |
| Precision Meds Ltd. | Health & social care | 2023 |
| Preferred Building Ltd | Construction | 2019 |
| Preferred Electrical Contractors Ltd | Construction | 2020 |
| Preferred Electrical Ltd | Construction | 2022 |
| Preferred Group Limited | Financial services | 2021 |
| Prefurred Grooming Ltd | Other services | 2020 |
| Premier Abrasives Limited | Extraterritorial | 1982 |
| Premium Piano Bytes Ltd. | Manufacturing | 2021 |
| Prestidge Psychology Ltd | Education | 2023 |
| Prestige Auto Solutions Ltd | Wholesale & retail | 2021 |
| Prestige Build Limited | Construction | 2014 |
| Prezio Dent Removal Ltd | Wholesale & retail | 2024 |
| Pricesure Limited | Financial services | 2025 |
| Pride in ST Neots Lgbt CIC | Arts & recreation | 2021 |
| Prima Property Limited | Real estate | 2018 |
| Primacy Utilities Ltd | Professional & scientific | 2024 |
| Prime Build Services Ltd | Construction | 2021 |
| Prime Position Marketing Ltd | Professional & scientific | 2011 |
| Prime Solution 24 Ltd | Administrative & support | 2018 |
| Primus Engineering Group Ltd | Professional & scientific | 2022 |
| Priory Court Freehold Limited | Real estate | 2012 |
| Priory Meadows (ST Neots) Management Company Limited | Households | 2011 |
| Priory Playhouse Ltd | Health & social care | 2025 |
| Pristine Lawns Limited | Administrative & support | 2016 |
| Pristine Vehicle Sales Ltd | Wholesale & retail | 2023 |
| Proactive Safety Leadership Ltd | Professional & scientific | 2018 |
| Procgen Labs Ltd | Information & communication | 2025 |
| Procure Group Ltd | Construction | 2023 |
| Proelo Ltd | Other services | 2022 |
| Progressive Packaging (Holdings) Limited | Manufacturing | 1991 |
| Project 55 Financial Ltd | Professional & scientific | 2025 |
| Project 87 Ltd | Real estate | 2025 |
| Project Orange Capital Limited | Financial services | 2026 |
| Project Orange Group Limited | Financial services | 2025 |
| Project Sherwood 2026 Limited | Financial services | 2026 |
| Proklass Products Ltd | Wholesale & retail | 2014 |
| Promoveo Land Limited | Real estate | 2018 |
| Property Management Assistant Ltd | Information & communication | 2024 |
| Property Plus Extra Limited | Real estate | 1995 |
| Property Portfolio Estates Ltd | Real estate | 2023 |
| Property Portfolio Mufb Ltd | Real estate | 2024 |
| Prorsa Group Limited | Financial services | 2024 |
| Prosis Print Management Limited | Information & communication | 2006 |
| Prospering Unlimited Ltd | Real estate | 2020 |
| Prospero Media Ltd | Information & communication | 1999 |
| Protec Smart Security Systems Ltd | Administrative & support | 2016 |
| PRS Building Services Ltd | Construction | 2025 |
| PRS Global Ltd | Professional & scientific | 2009 |
| Pulwave Ltd | Other services | 2023 |
| Purple Moon Consultancy Limited | Administrative & support | 2023 |
| Purser and Sons Builders Ltd | Construction | 2017 |
| Qabat Ltd | Other services | 2018 |
| QED Handelsagentur Ltd | Administrative & support | 2021 |
| QFT Networks Ltd | Professional & scientific | 2014 |
| Qianhe Capital Ltd | Real estate | 2017 |
| Qstar Precision Limited | Manufacturing | 2000 |
| Qualitec Limited | Construction | 1994 |
| Quantum Elite Services Ltd | Administrative & support | 2022 |
| Queenan Ltd. | Real estate | 2005 |
| Quentin Properties Limited | Real estate | 2018 |
| Quite Simply Property Solutions Limited | Construction | 2013 |
| Quote Beaver Ltd | Administrative & support | 2020 |
| R & D Cleaning Limited | Other services | 2002 |
| R & S Batihla Ltd | Administrative & support | 2026 |
| R H Renovations Ltd | Construction | 2024 |
| R&D Energy Limited | Construction | 2023 |
| R. Walsh Cleaning Services Ltd | Administrative & support | 2005 |
| R.D. Management Services Limited | Construction | 2006 |
| R2D Ltd | Hospitality | 2024 |
| RA Complete Interiors Ltd | Construction | 2026 |
| RAI Property Partnership Limited | Real estate | 2025 |
| Rajek Property Ltd | Real estate | 2024 |
| Ramsay Automation Systems Limited | Administrative & support | 2011 |
| Random Factor Limited | Manufacturing | 2001 |
| Rankin Enterprises Ltd | Wholesale & retail | 2020 |
| Ranpuls Retail Ltd | Wholesale & retail | 2026 |
| Rapid Relief Team | Other services | 2014 |
| Rapid Relief Team Trading Limited | Other services | 2017 |
| Raptix Ltd | Other services | 2021 |
| Ravine Management Ltd | Real estate | 2019 |
| Razor Shine Windows Ltd | Administrative & support | 2025 |
| Real 3D Technology Limited | Manufacturing | 2016 |
| Real Heat Plumbing & Heating Ltd | Construction | 2025 |
| Real Property Management Ltd | Construction | 2024 |
| Rebel & Ashby Ltd | Wholesale & retail | 2023 |
| Reciprocal Minds Limited | Professional & scientific | 2012 |
| Reclaimed Limited | Other services | 2011 |
| Redshift Space Solutions Ltd | Manufacturing | 2021 |
| Redstone Fencing and Landscaping Ltd | Administrative & support | 2026 |
| Reece's Rugby Coaching Ltd | Education | 2022 |
| Reed Roofing Limited | Construction | 2017 |
| Reeder & Sargant Limited | Professional & scientific | 2008 |