| Perrylogical Ltd | Information & communication | 2025 |
| Pestagon Pest Control Ltd | Administrative & support | 2010 |
| Pet Collective Limited | Wholesale & retail | 2011 |
| Petagene Holdings Ltd | Financial services | 2026 |
| Petagene Ltd | Information & communication | 2016 |
| Peter Latham Consultancy Limited | Construction | 2025 |
| Petrow Food Industries Limited | Wholesale & retail | 1993 |
| Pharaoh Homes Ltd | Real estate | 2022 |
| Pharma IT Consulting Limited | Information & communication | 2013 |
| Pharmed Validation Services Limited | Information & communication | 2024 |
| Pharos Teaching & Tutoring Limited | Education | 2005 |
| Picco Accounting Ltd | Professional & scientific | 2020 |
| Pightle Residents Limited | Households | 2009 |
| Pink Taco Ltd | Wholesale & retail | 2022 |
| Pinnacle Motorsport Ltd | Other services | 2016 |
| Pinnacle Risk Management Ltd | Administrative & support | 2026 |
| Piping Hot Services Ltd | Construction | 2025 |
| Piripiri Cricket Limited | Wholesale & retail | 2009 |
| PJE Properties Ltd | Construction | 2018 |
| Plasmidly Ltd | Information & communication | 2026 |
| Pleasant Close Management Company Limited | Real estate | 2015 |
| POINT2POINT Electrical Ltd | Construction | 2012 |
| Polar Pools Limited | Construction | 1980 |
| Pollendine Ltd | Construction | 2026 |
| Poppies Limited | Real estate | 2022 |
| Positive United Foods Limited | Wholesale & retail | 2025 |
| Posun Consulting Limited | Professional & scientific | 2017 |
| Posun Properties Limited | Real estate | 2021 |
| POW3R Motorsport Limited | Professional & scientific | 2021 |
| Powerdrive Systems Limited | Wholesale & retail | 2006 |
| Ppac Consulting Ltd | Professional & scientific | 2022 |
| Ppac Ltd | Professional & scientific | 2013 |
| Ppac Property Ltd | Real estate | 2017 |
| PPH Group Limited | Financial services | 2021 |
| Practical Haverhill Limited | Administrative & support | 2011 |
| Practical Mobility Limited | Manufacturing | 2004 |
| PRC Interiors Ltd | Construction | 2022 |
| Premier Experience Group Ltd | Financial services | 2022 |
| Prestige Sports Development Ltd | Arts & recreation | 2018 |
| Preview Commercials Ltd | Real estate | 2026 |
| Preview Property Services Ltd | Real estate | 2014 |
| Pricer UK Limited | Extraterritorial | 2007 |
| Pride Cars Taxi Limited | Transport & logistics | 2019 |
| Princetown Distillers Ltd | Manufacturing | 2015 |
| Pro-Alloy (Holdings) Limited | Financial services | 2018 |
| Pro-Alloy(Motor Sport)Limited | Manufacturing | 2003 |
| Proairesis Limited | Information & communication | 2026 |
| Procom Retail Ltd | Wholesale & retail | 2024 |
| Prodesign Decorating Ltd | Construction | 2024 |
| Professional Audio Visual (Cambridge) Limited | Wholesale & retail | 1995 |
| Professional Sound Consultancy Limited | Other services | 2003 |
| Profinish Interiors Ltd | Construction | 2021 |
| PSF Holdings Group Ltd | Administrative & support | 2025 |
| PSS Limited | Manufacturing | 2000 |
| Psychevita Limited | Information & communication | 2025 |
| Pulse SOC Ltd | Administrative & support | 2025 |
| Pure Energy Multimedia Ltd | Information & communication | 2000 |
| Pure KAT Consultancy Limited | Administrative & support | 2017 |
| Puresine Ltd | Professional & scientific | 2020 |
| Purple Star Property Limited | Real estate | 2023 |
| Putnam Rail Services Limited | Professional & scientific | 2013 |
| Puzzles Coffee Ltd | Manufacturing | 2026 |
| Q.E. Data Limited | Information & communication | 1997 |
| QRC Property Group Ltd | Construction | 2026 |
| QSF Property Limited | Real estate | 2013 |
| Qualitape (UK) Limited | Wholesale & retail | 1999 |
| Quality Build & Design Ltd | Construction | 2016 |
| Quality Kernels Limited | Manufacturing | 1999 |
| Quality Living Plus Services Limited | Health & social care | 2020 |
| Quickfix Drylining Ltd | Construction | 2015 |
| Quickflip Technologies Ltd | Manufacturing | 2025 |
| R Boon Haulage Ltd | Transport & logistics | 2023 |
| R G Elkins Professional Painters and Decorators Limited | Construction | 2016 |
| R R W Heating Limited | Households | 2004 |
| R Thomas & Sons Limited | Construction | 2017 |
| R W Wealth Management Limited | Financial services | 2017 |
| R Watfeh Enterprises Limited | Real estate | 2026 |
| R&S Spedition Ltd | Transport & logistics | 2015 |
| R1 Fire Pro Limited | Construction | 2009 |
| R3 Access Limited | Administrative & support | 2013 |
| R4HEALTH Limited | Health & social care | 2024 |
| RAJ Partners Limited | Real estate | 2014 |
| RAJ Restaurant Haverhill Ltd | Hospitality | 2025 |
| Ramsey Custom Homes Limited | Real estate | 2020 |
| Ramsey Custom Rentals Limited | Real estate | 2025 |
| Rapidaire Limited | Manufacturing | 1985 |
| Raveedha Care Limited | Health & social care | 2003 |
| Raytech Ltd | Wholesale & retail | 2026 |
| RBY Events Ltd | Construction | 2019 |
| Rcam Packaging Limited | Wholesale & retail | 2014 |
| RCD Care Staff Limited | Construction | 2017 |
| RDJ Properties Ltd | Real estate | 2008 |
| RDM Accounts Limited | Professional & scientific | 2023 |
| RDM Plumbing Solutions Limited | Construction | 2018 |
| Reallbproperties Ltd | Real estate | 2026 |
| Rebrandsoft Limited | Information & communication | 2018 |
| Red Hot Heating Solutions Ltd | Construction | 2022 |
| Red Lion Sturmer Limited | Hospitality | 2015 |
| Reed Equestrian Ltd | Agriculture & fishing | 2026 |
| Reeset Nations Limited | Health & social care | 2026 |