| Pekes Manor Limited | Hospitality | 2025 |
| Pelsin Imaging Limited | Health & social care | 2010 |
| Penelope's Portmanteau Kingston Limited | Wholesale & retail | 2010 |
| Penny Dawg Limited | Professional & scientific | 2019 |
| Penrose Contracting Limited | Other services | 2012 |
| Pentruder UK Limited | Administrative & support | 2009 |
| Perbeck Holdings Limited | Professional & scientific | 1999 |
| Perfect Plants (Sussex) Ltd | Administrative & support | 2012 |
| Perfection in Learning Ltd | Education | 2017 |
| Perfectly Green Holdings Limited | Financial services | 2022 |
| Perfectly Green Limited | Construction | 2007 |
| Performance Car Storage Ltd | Transport & logistics | 2025 |
| Persistence Films Limited | Information & communication | 2020 |
| Peskett Solutions Limited | Wholesale & retail | 1999 |
| Peter Rose Properties Limited | Real estate | 2023 |
| Peter Shoesmith & Co Limited | Professional & scientific | 2004 |
| Petley Farm POP UP Play Barn Ltd | Arts & recreation | 2024 |
| Pettett Limited | Construction | 2018 |
| Pevensey Cheese Company Limited | Manufacturing | 2018 |
| PGL Brickwork + Scaffolding Contractors Ltd. | Construction | 2010 |
| PGO Healthcare Ltd | Health & social care | 2025 |
| PGT Hook and SON Limited | Manufacturing | 2016 |
| Pharmacohub Limited | Wholesale & retail | 2018 |
| Pharmakon Healthcare Limited | Wholesale & retail | 2023 |
| Phaze One Limited | Other services | 2004 |
| Phiderm Ltd | Health & social care | 2021 |
| Phil and BEN Productions Limited | Arts & recreation | 2019 |
| Philcox Cuddington Mitchell Estate Agents Limited | Real estate | 2009 |
| Phoenix Close 1965 Limited | Extraterritorial | 2014 |
| Phoenix Homes SE Limited | Real estate | 2018 |
| Pickleb.Co.Uk Ltd | Arts & recreation | 2023 |
| Pictureportal Limited | Information & communication | 1987 |
| Piggott Commerce Ltd | Wholesale & retail | 2026 |
| Pilbeams Garage Limited | Wholesale & retail | 2019 |
| Pillar Wood Properties Ltd | Real estate | 2024 |
| Pillar Wood Rentals Ltd | Real estate | 2024 |
| Pink Prosecco Ltd | Wholesale & retail | 2020 |
| Pinnacle Consultants Limited | Real estate | 1999 |
| Pinnacle Surgical Group LLP | | 2025 |
| Pipers Wardrobe Ltd | Wholesale & retail | 2025 |
| Pixel Health Group Holdings Ltd | Financial services | 2024 |
| Pixel Health Group Ltd | Financial services | 2024 |
| PJC Services Ltd | Administrative & support | 2015 |
| Pjcc Holdings Limited | Financial services | 2019 |
| PJI Contract Packers Limited | Manufacturing | 2015 |
| Plan Studios Limited | Arts & recreation | 2015 |
| PLH & Sons Property Ltd | Real estate | 2019 |
| PLK Investments Limited | Real estate | 2021 |
| Plumpton Hub Ltd | Construction | 2023 |
| Plus Plumbing and Heating Ltd | Construction | 2021 |
| Plush Interiors Limited | Construction | 2013 |
| PM Farrell Ltd | Professional & scientific | 2014 |
| Pods Arts Ltd | Arts & recreation | 2025 |
| Polar Navigation Ltd | Professional & scientific | 2022 |
| Polarbay Networks Limited | Professional & scientific | 2015 |
| Polished Concrete London Ltd | Construction | 2021 |
| Pollard Bennett Limited | Real estate | 2021 |
| Pollard Bennett SUB Co Limited | Real estate | 2022 |
| Poormans Ltd | Professional & scientific | 2013 |
| Popmated Limited | Professional & scientific | 2025 |
| Poppy Lettings Ltd | Real estate | 2013 |
| Portal OH Limited | Professional & scientific | 2010 |
| Positivprofit Limited | Professional & scientific | 2026 |
| Powered by Humans Limited | Other services | 2013 |
| PPC Portland Limited | Real estate | 2018 |
| PPC Properties Ltd | Real estate | 2014 |
| Ppfff Clothing Limited | Wholesale & retail | 2023 |
| PRB Health & Safety Training Ltd | Professional & scientific | 2011 |
| Precision Healthcare Solutions LLP | | 2024 |
| Precision Painting Ltd | Construction | 2021 |
| Premier Aircraft Solutions Limited | Administrative & support | 2025 |
| Premier Construction (Sussex) Limited | Construction | 2016 |
| Premier Drone Solutions Ltd | Professional & scientific | 2024 |
| Premier Gourmet Foods Ltd | Wholesale & retail | 2013 |
| Premium Care Limited | Administrative & support | 1994 |
| Pressed Supplied Limited | Manufacturing | 2015 |
| Pressure Wave Audio Ltd | Information & communication | 2012 |
| Prestige Coastal Construction Ltd | Construction | 2023 |
| Prestige Homes (South East) Limited | Construction | 2014 |
| Prestige Property Holdings (South East) Limited | Financial services | 2025 |
| Prestige Property Investments (South East) Limited | Real estate | 2025 |
| Prestige Worldwide Holdco Limited | Financial services | 2024 |
| Prestige Worldwide Properties Limited | Real estate | 2024 |
| Pretty Please Hove Ltd | Other services | 2013 |
| PRG Publicity Limited | Other services | 1997 |
| Primary Homes Limited | Construction | 2024 |
| Primary Traffic Services Group Limited | Administrative & support | 2026 |
| Principal Architectural Design Limited | Professional & scientific | 2025 |
| Priory CT Farm Limited | Construction | 2024 |
| Prmp Limited | Professional & scientific | 2012 |
| Pro Main Solutions Ltd | Construction | 2021 |
| Pro Ponies UK Ltd | Wholesale & retail | 2021 |
| Pro-Eco Limited | Professional & scientific | 1996 |
| Proco Consultants Ltd | Administrative & support | 2016 |
| Profile Hair Design (Eastbourne) Limited | Other services | 2022 |
| Profile Specialist Cars Limited | Wholesale & retail | 2018 |
| Profilecars Limited | Wholesale & retail | 2014 |
| Profix Plumbing & Heating Installations Ltd | Construction | 2023 |
| Project ELM Limited | Financial services | 2023 |
| Project Solutions Delivered Limited | Professional & scientific | 2016 |