| Parsectix UK Ltd | Information & communication | 2018 |
| Parser Services Limited | Professional & scientific | 2014 |
| Parsonage Close Management Company Limited | Extraterritorial | 1988 |
| Part Human Ltd | Arts & recreation | 2015 |
| Partner Strategic Assistance Limited | Information & communication | 2019 |
| Partypeopleuk Ltd | Arts & recreation | 2022 |
| PAS Solutions Limited | Administrative & support | 2003 |
| Pasare Composites Ltd | Manufacturing | 2020 |
| Pascoe Pleasence Ltd | Professional & scientific | 2011 |
| Pasha Building Maintenance Ltd | Construction | 2024 |
| Pashas Properties Ltd | Real estate | 2024 |
| Pashley Theatrical Services Limited | Arts & recreation | 2019 |
| Pass Fast Ltd | Education | 2025 |
| Pass Viva Ltd | Education | 2023 |
| Passage Place Management Limited | Real estate | 2014 |
| Passivhaus Architects Limited | Professional & scientific | 2010 |
| Pasta DI Julia Ltd | Wholesale & retail | 2024 |
| Pasticceria Amalfi Limited | Manufacturing | 2018 |
| Pastim Cambridge Bakery Limited | Manufacturing | 2021 |
| Pastor House Ltd | Professional & scientific | 2014 |
| Pastore Brewing and Blending Limited | Manufacturing | 2018 |
| Pata Negra Spanish Food Ltd | Wholesale & retail | 2015 |
| Patchwork Education Village C.I.C. | Education | 2023 |
| Patchwork Enterprises Limited | Professional & scientific | 2021 |
| Patel Brothers (Dunmow) Ltd | Hospitality | 2020 |
| Patent Search & Information Management Limited | Professional & scientific | 2013 |
| PATH4SOLUTIONS Ltd | Other services | 2025 |
| Pathable Limited | Professional & scientific | 2017 |
| Pathbridge BIO Ltd | Professional & scientific | 2026 |
| Pathfinder Construction Ltd | Construction | 2021 |
| Pathway Design Ltd | Professional & scientific | 2019 |
| Pathway Industry Co., Ltd | Wholesale & retail | 2024 |
| Pathway Medical Affairs Ltd | Professional & scientific | 2016 |
| Patient Powered Medicine Limited | Information & communication | 2013 |
| Patients Know Best Limited | Information & communication | 2008 |
| Patientsource Limited | Information & communication | 2012 |
| Patnav Limited | Information & communication | 2022 |
| Patrick Baert Ltd | Professional & scientific | 2022 |
| Patrick Charlton Consultancy Limited | Professional & scientific | 2015 |
| Patrick Cheung Limited | Information & communication | 2015 |
| Patrick Cowling Arable Consultants Ltd | Agriculture & fishing | 2010 |
| Patrick Maier Ltd | Information & communication | 2025 |
| Patrivia Ltd | Real estate | 2025 |
| Patro-Tech Composites Ltd | Manufacturing | 2023 |
| Patroclo Ltd | Wholesale & retail | 2010 |
| Patru Puncte Cardinale Ltd | Manufacturing | 2023 |
| Patsfield Limited | Real estate | 2011 |
| Patzileass Ltd | Transport & logistics | 2024 |
| Paul CHU Chiy Ltd | Professional & scientific | 2024 |
| Paul Church Electrical Limited | Construction | 2016 |
| Paul Fannon Consulting Ltd | Professional & scientific | 2021 |
| Paul Glover Associates Limited | Professional & scientific | 1999 |
| Paul Gumbley Investments Limited | Professional & scientific | 2022 |
| Paul Rutter Limited | Professional & scientific | 2016 |
| Paul Sacks Club Brand Co., Ltd | Manufacturing | 2022 |
| Paul Smith Property Ltd | Real estate | 2016 |
| Paul T Smith Limited | Transport & logistics | 2015 |
| Paul Thompson Limited | Education | 2002 |
| Paul Waldmann Limited | Construction | 2014 |
| Paul Worth Neurology Ltd | Health & social care | 2019 |
| PAULGEORGE27 Aviation Ltd | Manufacturing | 2026 |
| Paulo Gasoto Ltd | Manufacturing | 2024 |
| Paulredsports Ltd | Wholesale & retail | 2011 |
| Pauls of Papworth Private Hire Ltd | Transport & logistics | 2019 |
| PAVEL4 Ltd | Manufacturing | 2024 |
| Pavilia Property Limited | Real estate | 2022 |
| Pavilion Gardens (Saffron Walden) Management Company Limited | Real estate | 2000 |
| Pavimento Precast Ltd | Construction | 2022 |
| Pavnic Ltd | Manufacturing | 2024 |
| Pawel Plociennik Ltd | Manufacturing | 2025 |
| Pawprint Kingdom Co., Ltd | Wholesale & retail | 2023 |
| Paws 4 Coffee Cambridge Ltd | Hospitality | 2026 |
| Pawsport UK Ltd | Agriculture & fishing | 2025 |
| Pawtential BIO Ltd | Professional & scientific | 2026 |
| Paxton Reed Ltd | Information & communication | 2015 |
| PAY365 Limited | Financial services | 2017 |
| Payless Business Group Ltd | Professional & scientific | 2014 |
| PAYMASTER24 Ltd | Financial services | 2013 |
| Paymate Limited | Administrative & support | 1997 |
| PB Originals Ltd | Manufacturing | 2019 |
| Pbatech Ltd | Manufacturing | 2026 |
| PC Geoscience Services Ltd | Mining & quarrying | 2024 |
| PC International Limited | Other services | 1981 |
| PCA B1 Services Ltd | Manufacturing | 2026 |
| PCB Cambridge Limited | Financial services | 2015 |
| PCC Surgery Ltd | Health & social care | 2021 |
| PCR Smile Ltd | Health & social care | 2022 |
| PD and NJ Hayes Ltd | Professional & scientific | 2014 |
| Pdec Limited | Information & communication | 2015 |
| PDJ Hanvey Aviation Ltd | Manufacturing | 2017 |
| Pdsvision Cambridge Limited | Information & communication | 1992 |
| Peace Child International | Health & social care | 2002 |
| Peaceful Universe Co., Ltd | Wholesale & retail | 2025 |
| Peach Machines Limited | Manufacturing | 2023 |
| Peacock Elec Ltd | Construction | 2014 |
| Peacock Hill Limited | Professional & scientific | 2016 |
| Peacock Male Image and Grooming Limited | Other services | 2023 |
| Peak 4122 Media Ltd | Professional & scientific | 2024 |
| Peak Bioprocess Solutions Ltd | Professional & scientific | 2025 |
| Peak Engagement Technologies (UK) Limited | Information & communication | 2018 |