| PK Rainbow Limited | Real estate | 2019 |
| PKB Computer Consultants Limited | Information & communication | 1995 |
| PKW NG Ltd | Wholesale & retail | 2018 |
| PL1 Goalkeeping Academy Ltd | Extraterritorial | 2021 |
| Placenta Essex Ltd | Health & social care | 2026 |
| Planetary Healthcare Ltd | Health & social care | 2022 |
| Plunkco Limited | Professional & scientific | 2014 |
| PMR Financial Solutions Limited | Financial services | 2013 |
| PNV Ltd | Real estate | 2020 |
| Pobail C.I.C. | Energy | 2015 |
| Polar Accounting Ltd | Professional & scientific | 2024 |
| Polar Smile Ltd | Information & communication | 2024 |
| Poolappy Ltd. | Information & communication | 2019 |
| Port of Creeksea Limited | Transport & logistics | 1998 |
| Portable Pints Ltd | Hospitality | 2023 |
| Portmount Property Limited | Real estate | 1993 |
| Portway Building Services Limited | Wholesale & retail | 2014 |
| Powell Court Management Limited | Households | 1999 |
| Powells Florist Limited | Wholesale & retail | 2006 |
| Pppc Limited | Administrative & support | 2018 |
| Precise Signs Ltd | Extraterritorial | 2013 |
| Precise Steel and Mechanical Limited | Construction | 2020 |
| Precon Services Limited | Professional & scientific | 2025 |
| Premier Care Partners Limited | Health & social care | 2011 |
| Premier KID Soccer Limited | Financial services | 2011 |
| Premier Paving & Tiles Limited | Construction | 2017 |
| Pressie Ltd | Health & social care | 2015 |
| Pretty Perfect Home Services Limited | Administrative & support | 2021 |
| Pretty Perfect People Ltd | Financial services | 2024 |
| Pretty Perfect Planners App Limited | Information & communication | 2025 |
| Pretty Perfect Planners Ltd | Wholesale & retail | 2022 |
| Pretty Perfect Platforms Ltd | Information & communication | 2024 |
| Pretty Perfect Products Ltd | Wholesale & retail | 2024 |
| Price Turfcare Ltd | Wholesale & retail | 2016 |
| Prigo Electrical Services Limited | Construction | 2016 |
| Primal South Ltd | Wholesale & retail | 2019 |
| Primary P.E. Limited | Arts & recreation | 2015 |
| Prime Degrees Ltd | Construction | 2024 |
| Prime Finance Solutions Ltd | Professional & scientific | 2019 |
| Prime Pellets Limited | Wholesale & retail | 2023 |
| Prime Site Management Ltd | Construction | 2024 |
| Princes Lodge Management Limited | Households | 2000 |
| Priors Hall Foods and Farming Limited | Agriculture & fishing | 2022 |
| Priors Hall Limited | Agriculture & fishing | 1994 |
| Prismar Contract Services Limited | Construction | 2023 |
| Prismar Contracts Limited | Construction | 2016 |
| Prismar Group Limited | Financial services | 2023 |
| Pristine Bodyworks Ltd | Wholesale & retail | 2021 |
| Pristine Works Ltd | Administrative & support | 2025 |
| Prittlewell Consulting Limited | Real estate | 2012 |
| PRO83 Academy Ltd | Arts & recreation | 2022 |
| Profuture Limited | Information & communication | 1993 |
| Progressive Coaching Ltd | Arts & recreation | 2018 |
| Project Mech Ltd | Manufacturing | 2025 |
| Prometheus Bound Limited | Manufacturing | 2009 |
| Prontopart Developments Limited | Financial services | 2021 |
| Prontopart Services Limited | Extraterritorial | 2021 |
| Property Developments Plus Limited | Construction | 2005 |
| Property MD Limited | Real estate | 2022 |
| PROPS4SHOWS Limited | Wholesale & retail | 2010 |
| Prosper Blue Ltd | Professional & scientific | 2019 |
| Prosper Lake Consulting Limited | Administrative & support | 2011 |
| Prostone Ltd | Other services | 2008 |
| PSA Accounting Services Limited | Professional & scientific | 2025 |
| PSM New Builds Ltd | Construction | 2023 |
| PSN Property Investments Limited | Real estate | 2017 |
| Pudsey Hall Lane Management Company Ltd | Households | 2026 |
| Puffin PMC Ltd | Professional & scientific | 2014 |
| Pulp Kitchen 2021 Ltd | Hospitality | 2021 |
| Pulse Electronics (Avionics) Limited | Manufacturing | 1977 |
| Pump Lane Developments Limited | Construction | 2024 |
| Punchbowl Paglesham Limited | Hospitality | 2023 |
| Punyalan Ltd | Wholesale & retail | 2024 |
| Pure Sound Promotions Limited | Arts & recreation | 2023 |
| Pureair MEP Ltd | Construction | 2025 |
| Purple Vision Limited | Professional & scientific | 2024 |
| Pycraft and LEE Auto Sales Limited | Wholesale & retail | 1979 |
| Pyrite Holdings Ltd | Professional & scientific | 2022 |
| Q Ball Sports Bar Ltd | Hospitality | 2022 |
| QED (GAS) Consulting Limited | Administrative & support | 2010 |
| Qualipro Technology Limited | Information & communication | 2021 |
| Quality Energy Developments Consulting Limited | Administrative & support | 2010 |
| Quantum Property Investments Ltd | Professional & scientific | 2022 |
| Quarrycode Limited | Information & communication | 2011 |
| Queen Anne Street Capital Limited | Financial services | 2017 |
| Questcorp Ltd | Professional & scientific | 2022 |
| Quickstart Wellness Limited | Health & social care | 2014 |
| Quinn Air Limited | Information & communication | 2007 |
| Quirks Car Company Limited | Wholesale & retail | 2004 |
| Quirks Construction Company Limited | Construction | 2014 |
| Quirks Holdings Limited | Administrative & support | 2019 |
| Quirks Service Centre Limited | Wholesale & retail | 2016 |
| R & a Mechanical Services Ltd | Construction | 2009 |
| R C Advisory Ltd | Professional & scientific | 2020 |
| R E Essex Limited | Manufacturing | 2008 |
| R J Waller Engineering Ltd | Manufacturing | 2022 |
| R Rose Engineering Limited | Other services | 2002 |
| R&B Mortgage & Protection Limited | Professional & scientific | 2026 |
| R&K Properties Group Limited | Real estate | 2023 |
| R. & D. Flooring Company Limited | Construction | 1974 |