| PH Drafting Limited | Construction | 2008 |
| Pharmanswers Ltd | Professional & scientific | 2006 |
| Phase Investment Ltd | Construction | 2024 |
| PHC Trading Limited | Wholesale & retail | 2022 |
| PHD Chiropractic Limited | Health & social care | 2011 |
| Pheasant Suites Limited | Hospitality | 2007 |
| Phelan Barker Limited | Other services | 2018 |
| Phil Gotts Consulting Ltd | Professional & scientific | 2012 |
| Phil King Consultants Limited | Professional & scientific | 2019 |
| Philip Bridgford Limited | Health & social care | 2018 |
| Philip Liverton Limited | Agriculture & fishing | 2006 |
| Philip Martin Electrical Limited | Construction | 2003 |
| Philip Smith Plumbing and Heating Limited | Construction | 2007 |
| Philo Properties Limited | Real estate | 2015 |
| Philzerb Healthcare Services Limited | Health & social care | 2025 |
| Phmc Limited | Other services | 2013 |
| Phoenix Close Limited | Households | 2005 |
| Phoenix Creative Provisions Ltd | Hospitality | 2024 |
| Phoenix Fish Sales Limited | Wholesale & retail | 2016 |
| Phoenix Homes Colchester | Health & social care | 2007 |
| Phoenix House 2 Ltd | Professional & scientific | 2020 |
| Phoenix Innotech Limited | Information & communication | 2024 |
| Phoenix Legal Advisors Ltd | Professional & scientific | 2026 |
| Phoenix Renovations (Essex) Ltd | Construction | 2026 |
| Phoenix Small Business Support Ltd | Professional & scientific | 2025 |
| Phoenix Tech Innovations Ltd | Administrative & support | 2023 |
| Phone FIX Essex Limited | Wholesale & retail | 2023 |
| Phone Locker Ltd | Wholesale & retail | 2026 |
| Photo Art Centre Limited | Wholesale & retail | 1983 |
| Photo Engineers Limited | Professional & scientific | 2010 |
| Photo Excellence Ltd | Professional & scientific | 2026 |
| Photohausgroup Ltd | Professional & scientific | 2021 |
| Photon Associates Ltd | Administrative & support | 2019 |
| PHP Health First Limited | Health & social care | 2009 |
| Phronesis Industries Ltd | Manufacturing | 2026 |
| Phrtc Ltd | Arts & recreation | 2010 |
| PHY Developments Limited | Construction | 2026 |
| Physician.Com Limited | Extraterritorial | 2004 |
| Physio Services Ltd | Health & social care | 2018 |
| Physio to YOU Limited | Health & social care | 2025 |
| PHYSIO3 Ltd | Health & social care | 2020 |
| Physmed Limited | Health & social care | 2001 |
| Piccolo 42 North Hill Ltd | Hospitality | 2022 |
| Pick a Door Properties Limited | Real estate | 2018 |
| Pick Smart Ltd | Hospitality | 2018 |
| Pickett Construction Services Ltd | Construction | 2018 |
| Picketts Farm Ltd | Agriculture & fishing | 2025 |
| Pickled Onion Ventures Ltd | Financial services | 2022 |
| Picknell Solutions Limited | Administrative & support | 2025 |
| Picky Chef Limited | Hospitality | 2024 |
| Pidco Limited | Administrative & support | 2013 |
| Pidgley Investments Limited | Financial services | 2018 |
| Pier at Harwich Limited(The) | Hospitality | 1977 |
| Pigeon (Aldeburgh) Limited | Real estate | 2011 |
| Pigeon Properties Limited | Real estate | 1988 |
| Pightles Developments Limited | Construction | 2015 |
| Piktical Limited | Information & communication | 2018 |
| Pilar Investments Limited | Construction | 2018 |
| Pilar Management Limited | Households | 2019 |
| Pile Link Ltd | Construction | 2024 |
| Pilgrim Builders Limited | Construction | 1998 |
| Pilot Developments Ltd | Other services | 2007 |
| Pina Property Solutions Ltd | Real estate | 2023 |
| Pincase Flat Management Company Limited | Households | 1979 |
| Pinch Group Limited | Administrative & support | 1998 |
| Pincuz Limited | Health & social care | 2022 |
| Pine Court Wivenhoe Ltd | Households | 2012 |
| Pine Fields Private Limited | Real estate | 2010 |
| Pine Needles Ltd | Arts & recreation | 2024 |
| Pine Valley Interiors Limited | Wholesale & retail | 2004 |
| Pineapple Medical Limited | Real estate | 2017 |
| Pinecoast Limited | Real estate | 1996 |
| Pinecrown Limited | Households | 1992 |
| Pinewood Services Ltd | Construction | 2026 |
| Pink Dust Busters Limited | Administrative & support | 2012 |
| Pink Nylon Limited | Health & social care | 2015 |
| Pink Skies Studio Ltd | Manufacturing | 2023 |
| Pinnacle Apex Limited | Public administration | 2023 |
| Pinnacle Body Movement Ltd | Health & social care | 2025 |
| Pinpoint Business Limited | Professional & scientific | 2014 |
| Pinpoint Electrical Ltd | Construction | 2023 |
| Pinpoint Trading Academy Ltd | Education | 2022 |
| Pioneer Concepts Ltd | Construction | 2014 |
| Pioneer Research Chemicals Limited | Manufacturing | 1982 |
| Pioter Ltd | Transport & logistics | 2019 |
| PIP Solutions Training Ltd | Health & social care | 2019 |
| Pipe & Tube Machines Limited | Manufacturing | 2010 |
| Pipeline Associates Limited | Construction | 2002 |
| Pipeline Associates South Limited | Construction | 2026 |
| Pipeline Investment Ltd | Hospitality | 2018 |
| Pips Trees and Landscaping Ltd | Administrative & support | 2019 |
| Piranha Audio Visual (South & East) Ltd | Information & communication | 2025 |
| Pirium Engineering Limited | Professional & scientific | 2014 |
| Pisa Fire and Security Ltd | Construction | 2023 |
| Piscina Swimming Pools & Design Ltd | Construction | 2026 |
| Pistachioella Limited | Wholesale & retail | 2026 |
| Pitch INT Limited | Professional & scientific | 2020 |
| Pitsea Tile Centre Ltd | Wholesale & retail | 2017 |
| Pitstop.Col Limited | Hospitality | 2025 |
| PIW Painting Ltd | Construction | 2022 |