| Oxybirthin Limited | Education | 2020 |
| Oxygen Aviation Limited | Transport & logistics | 2005 |
| Oxygen Holdings Limited | Financial services | 2023 |
| P & N Property Services Ltd | Real estate | 2026 |
| P & R Services (Horsham) Ltd | Administrative & support | 2024 |
| P and a Research and Consulting Limited | Professional & scientific | 2012 |
| P B Groundworks Limited | Construction | 2011 |
| P Interiors Limited | Construction | 2003 |
| P Moore Management Ltd | Construction | 2019 |
| PAC ' N VAC Limited | Wholesale & retail | 2011 |
| Paca Aircraft Maintenance Services Ltd | Manufacturing | 2023 |
| Pace Finance Ltd | Financial services | 2020 |
| Pace Media Development Limited | Information & communication | 2017 |
| Pace Performance Marketing Ltd | Professional & scientific | 2022 |
| Pacedco NO. 1 Limited | Hospitality | 2012 |
| Pacific Swimming Pool Maintenance Ltd | Administrative & support | 2018 |
| Pacta Connect UK Limited | Wholesale & retail | 2009 |
| Padel Maison Ltd | Construction | 2023 |
| Padraig Developments Limited | Real estate | 2016 |
| Pags Education UK Limited | Education | 2018 |
| Painted Clouds Ltd | Information & communication | 2021 |
| Palmer Cars Ltd | Arts & recreation | 1994 |
| Palmer GRP Ltd | Wholesale & retail | 2022 |
| Palmer Sports Management Limited | Arts & recreation | 1999 |
| Palmersport Limited | Arts & recreation | 1999 |
| Panadeus Holdings Limited | Financial services | 2021 |
| Panadeus Property Management Limited | Real estate | 2020 |
| Pandorica Limited | Professional & scientific | 2014 |
| Pansy Potter Properties Ltd | Real estate | 2024 |
| Pantree Holdings Ltd | Wholesale & retail | 2025 |
| Papaya Boat Ltd | Information & communication | 2024 |
| Papetti Enterprises Limited | Real estate | 2014 |
| Paradigm Planning Limited | Professional & scientific | 2014 |
| Paradise Ponds Limited | Construction | 2024 |
| Paragon Design Concepts Limited | Information & communication | 1990 |
| Parallel Dynamic Limited | Information & communication | 2014 |
| Paramount Campers Ltd | Manufacturing | 2021 |
| Parasure Limited | Wholesale & retail | 2012 |
| Parcel Globe Limited | Transport & logistics | 2021 |
| Parker Heath Ltd | Administrative & support | 2011 |
| Parker Heath Spilkin Knight Limited | Professional & scientific | 2013 |
| Parkfield Publishing Ltd | Information & communication | 2024 |
| Parkgate UK Limited | Administrative & support | 1999 |
| Parkminster Farms Limited | Agriculture & fishing | 1987 |
| Parkrevel Limited | Professional & scientific | 1992 |
| Parkside Residential Limited | Real estate | 2021 |
| Parshott Company Limited | Administrative & support | 1964 |
| Parsons Carpentry and Construction Limited | Construction | 2023 |
| PART21 Services Limited | Professional & scientific | 2015 |
| Partfinder Limited | Administrative & support | 2009 |
| Partflat Limited | Real estate | 1995 |
| Partridge Management Limited | Real estate | 2014 |
| Partridge Motor Cars Limited | Wholesale & retail | 2020 |
| Party RE BAG Ltd | Wholesale & retail | 2025 |
| PAS Automotive Engineers & Assessors Ltd | Wholesale & retail | 2005 |
| Patel Medical Consultancy Limited | Financial services | 2022 |
| Patermeus Ltd | Construction | 2021 |
| Pathway Paraplanning Limited | Financial services | 2022 |
| Patman (Sussex) Limited | Professional & scientific | 2024 |
| Patrick Baroni Ltd | Information & communication | 2020 |
| Pattenden Lighting Services Limited | Other services | 2007 |
| Paul Chinnery Properties Ltd | Real estate | 2021 |
| Paul Denhart Associates Ltd | Professional & scientific | 2012 |
| Paul Eden Advisory Ltd | Professional & scientific | 2018 |
| Paul Johnston Ltd | Construction | 2010 |
| Paul O'Dwyer Limited | Other services | 2010 |
| Paul Simon Furnishings Limited | Manufacturing | 1990 |
| Paul Summerfield Design Ltd | Professional & scientific | 2017 |
| Paul Swan Landscaping Limited | Administrative & support | 2003 |
| Paul Swift Coaching Ltd | Professional & scientific | 2002 |
| Paul Taylor Financial Consultants Ltd | Financial services | 2017 |
| Paul Weymouth Homes Limited | Construction | 2003 |
| Paula's Beauty Circle Limited | Other services | 2025 |
| Paula's Property Circle Limited | Households | 2025 |
| Pauls Bakery Ltd | Manufacturing | 2024 |
| Pauls-Studio UK Ltd | Professional & scientific | 2008 |
| Pavement Standard Ltd | Professional & scientific | 2025 |
| Pavilion Estates Sussex Limited | Real estate | 2018 |
| Payment Bear Limited | Information & communication | 2022 |
| PB Consultancy Services Limited | Administrative & support | 2005 |
| PBM Consulting Ltd | Professional & scientific | 2020 |
| PC Assistance Ltd | Information & communication | 2012 |
| Pcps London Ltd | Construction | 2018 |
| PCT Europe Limited | Manufacturing | 2016 |
| PD Planning UK Ltd | Professional & scientific | 2011 |
| Pdas & Sons Ltd | Information & communication | 2024 |
| PDM Process Limited | Professional & scientific | 2022 |
| Peach Technologies Limited | Information & communication | 2006 |
| Peacocks Hill Smallholding Ltd | Agriculture & fishing | 2025 |
| Peak Water Limited | Wholesale & retail | 2019 |
| Pearl Alliance Limited | Real estate | 2025 |
| Pearl Aura Limited | Health & social care | 2026 |
| Pearl Haulage Ltd | Construction | 2023 |
| Pearl Horizons Limited | Health & social care | 2025 |
| Pearl Hotel (Gatwick) Limited | Hospitality | 2005 |
| Pearl Hotel (Slough) Limited | Hospitality | 2018 |
| Pearl Hotels (Horley) Limited | Real estate | 2022 |
| Pearl Hotels Holding Limited | Professional & scientific | 2003 |
| Pearse & Sons Limited | Administrative & support | 2024 |
| Pearson Aviation Ltd | Transport & logistics | 2017 |