| Ponder Construction Limited | Construction | 2005 |
| Ponder Homes Limited | Construction | 2014 |
| Ponere UK Ltd | Construction | 2015 |
| Poneys (Wickham Bishops) Management Company Limited | Administrative & support | 1992 |
| Pooch Grooming Ltd | Other services | 2008 |
| Poochios Ltd | Wholesale & retail | 2009 |
| Poole Horizons Ltd | Public administration | 2022 |
| POP Essex | Health & social care | 2022 |
| POP Holdings (UK) Limited | Information & communication | 2011 |
| POP Services (UK) Limited | Information & communication | 2013 |
| POP Telecom Limited | Information & communication | 2011 |
| Popescu Healthcare Ltd | Health & social care | 2019 |
| Poplar Nurseries (Holdings) Limited | Professional & scientific | 2005 |
| Poplar Nurseries Limited | Wholesale & retail | 1949 |
| Popping Orange Communications Limited | Information & communication | 2023 |
| Poppyfields (East Harling) Management Company Limited | Households | 2021 |
| Populate Investments 1 Limited | Financial services | 2026 |
| Populate London Limited | Professional & scientific | 2020 |
| Porchester Properties (Essex) Limited | Construction | 2003 |
| Port & Marine Facilities Ltd | Professional & scientific | 2025 |
| Port Direction Ltd | Wholesale & retail | 2023 |
| Port One (BUS Company) Limited | Transport & logistics | 2021 |
| Port One (FDS) Ltd | Real estate | 2017 |
| Port One (Land) Limited | Construction | 2022 |
| Port One (Management Company) Limited | Administrative & support | 2021 |
| Port One (Unit 11) Limited | Other services | 2022 |
| Port One (Unit 12) Limited | Other services | 2022 |
| Port One (Unit 14) Limited | Other services | 2022 |
| Port One (Unit 15) Limited | Other services | 2022 |
| Port One (Unit 5) Limited | Other services | 2022 |
| Port One (Unit 6) Limited | Real estate | 2021 |
| Port One (Unit One) Limited | Construction | 2019 |
| Port One (Units 7 to 10) Limited | Other services | 2022 |
| Port One Logistics Ltd | Other services | 2021 |
| Portable Machining Services Limited | Manufacturing | 2001 |
| Portaminta Limited | Administrative & support | 2023 |
| Portas House Management Company Limited | Households | 2015 |
| Portelet Lodge Limited | Real estate | 2024 |
| Porth Properties Limited | Real estate | 2025 |
| Portia Star Lane Ltd | Hospitality | 2012 |
| Porticol Ltd | Professional & scientific | 2020 |
| Portofino (Colchester) Limited | Real estate | 2005 |
| POS Communications Limited | Professional & scientific | 2024 |
| Pose Media Limited | Information & communication | 2022 |
| Posh Penny Ltd | Administrative & support | 2024 |
| Positive Waste Solutions Limited | Administrative & support | 2017 |
| Positivity and Wellbeing Limited | Administrative & support | 2021 |
| Postaboy Studios Ltd | Information & communication | 2026 |
| Potate Hub Ltd | Hospitality | 2023 |
| Potters Plumbing Limited | Construction | 2019 |
| Potters Surveying & Drone Services Limited | Professional & scientific | 2026 |
| Poul Online Ltd | Wholesale & retail | 2025 |
| Poupart Limited | Wholesale & retail | 1936 |
| Power & Data Logistics Limited | Construction | 1997 |
| Power City Limited | Other services | 2023 |
| Power Design Projects Limited | Construction | 2004 |
| Power Developments (UK) Limited | Wholesale & retail | 2008 |
| Power Drywall Limited | Construction | 2017 |
| Power One Ltd | Administrative & support | 2019 |
| Power Tech Solutions Ltd | Construction | 2023 |
| Powered Enterprise Limited | Construction | 2024 |
| Powered Enterprise Properties Limited | Households | 2025 |
| Powerpulse Products Limited | Manufacturing | 2002 |
| Powertankers Ltd | Water & waste | 2025 |
| Powertech Electrical Installers Ltd | Construction | 2023 |
| Poynter Training Ltd | Other services | 2024 |
| PP Colchester Limited | Hospitality | 2024 |
| PP Refurbishments Limited | Construction | 2009 |
| PP63 Properties Limited | Real estate | 2024 |
| PR Building Contractors Ltd | Construction | 2025 |
| PR Live (Storm) Ltd | Arts & recreation | 2026 |
| PR Roofing Services Ltd | Construction | 2016 |
| Praevidus Commercial Finance Limited | Financial services | 2024 |
| Pragmaforge Ltd | Information & communication | 2025 |
| Pramen Properties Limited | Real estate | 1967 |
| Prana Holistics Ltd | Other services | 2023 |
| Pranic Therapy Ltd | Health & social care | 2019 |
| Prashant Arora Ltd | Professional & scientific | 2014 |
| Pratik Patel Limited | Health & social care | 2011 |
| Praveet Ltd | Manufacturing | 2007 |
| Praxis Strategy Limited | Professional & scientific | 2015 |
| Praxiscast Limited | Arts & recreation | 2022 |
| Prayer Connections | Other services | 2019 |
| Prayrpath Ltd | Information & communication | 2026 |
| Prazmo Limited | Transport & logistics | 2016 |
| PRC Clean (UK) Limited | Administrative & support | 2013 |
| Precast Flooring Specialist Contractors Ltd | Construction | 2021 |
| Preceptr Ltd | Administrative & support | 2017 |
| Precise Tax & Accountancy Limited | Professional & scientific | 2014 |
| Precision Grinding Technologies Ltd | Manufacturing | 2018 |
| Precision Physique Coaching Ltd | Education | 2024 |
| Precision Piling Services Ltd | Construction | 2024 |
| Predator Flooring Limited | Construction | 2019 |
| Predators Transformations Limited | Arts & recreation | 2023 |
| Preferred Properties Ltd | Real estate | 2016 |
| Preheat Ltd | Construction | 2021 |
| Premier Autovision Limited | Wholesale & retail | 2013 |
| Premier Collections Limited | Wholesale & retail | 2002 |
| Premier GAS Plumbing Solutions Ltd | Construction | 2023 |
| Premier Homecare (East) Limited | Health & social care | 2001 |