| Peter Wood Financial Planning Limited | Professional & scientific | 2020 |
| Peters & Grant Estates Limited | Real estate | 2024 |
| Peters & Townsend Developments Limited | Construction | 2025 |
| Peters Group Limited | Professional & scientific | 2024 |
| Peters Investment Group Limited | Financial services | 2025 |
| Petherdale Property Management Limited | Households | 2000 |
| Petitspapillons Limited | Health & social care | 2026 |
| Petpals (Stockport) Limited | Other services | 2003 |
| Petpals Stockton Ltd | Other services | 2024 |
| Petrena Brown - the Personal Estate Agent Ltd | Real estate | 2021 |
| Petroliam Engineering Limited | Administrative & support | 2012 |
| Petrou & Sons Enterprises Limited | Real estate | 2016 |
| Petrou & Sons LLP | | 2017 |
| Petts Wood Opticians Limited | Health & social care | 2014 |
| PFG 2012 Ltd | Construction | 2013 |
| PFT Cleaning Ltd | Administrative & support | 2020 |
| PG Consultant Limited | Professional & scientific | 2023 |
| PGA Investment Properties Ltd | Real estate | 2007 |
| PH Business Services London Limited | Administrative & support | 2014 |
| PH Entertainment Ltd | Arts & recreation | 2018 |
| PH3 Foundation | Education | 2013 |
| Phantom Logistics Ltd | Transport & logistics | 2017 |
| Pharma Retail Uruguay Ltd | Financial services | 2025 |
| Pharmaglow RX Ltd | Wholesale & retail | 2025 |
| Pharmify Ltd | Wholesale & retail | 2023 |
| Pharmium Limited | Wholesale & retail | 2024 |
| Phelps House RTM Company Limited | Households | 2024 |
| PHG Mechanical Services Ltd | Construction | 2017 |
| PHG Ventures Limited | Professional & scientific | 2024 |
| Phil Flan Services Ltd | Construction | 2014 |
| Phil Greenaway Consultancy Limited | Professional & scientific | 2023 |
| Phillip Horne Limited | Construction | 2012 |
| Phillips Fires Ltd | Construction | 2021 |
| Phisola UK Ltd | Manufacturing | 2019 |
| Phoenix International Trading Company Limited | | 1990 |
| Phoenix Real Estate Advisors Ltd | Real estate | 2023 |
| Phoenix Rose PR & Communications Limited | Professional & scientific | 2020 |
| Phoenix Skyline Limited | Professional & scientific | 2024 |
| Phoenix Summits Ltd | Administrative & support | 2026 |
| Photizo Consultancy Limited | Administrative & support | 2024 |
| Phsr Plumbing & Heating Ltd | Construction | 2024 |
| Phyllis Pearse Mews Management Limited | Households | 2020 |
| Physio AID Ltd | Health & social care | 2015 |
| Physio BOT Limited | Health & social care | 2015 |
| Pibo Investments Ltd | Financial services | 2021 |
| Picardo's Drylining Ltd | Construction | 2023 |
| Picasso (Bevington Road) Residents Company Limited | Households | 2008 |
| Piccadilly MAN Shop Limited | Extraterritorial | 1949 |
| Pick and MIX Music Ltd | Administrative & support | 2002 |
| Pickering Home Improvements Ltd | Construction | 2022 |
| Pickfords Gardens RTM Company Limited | Households | 2010 |
| Pickhurst Consulting Ltd | Professional & scientific | 2024 |
| Pickhurst Green Allotments Ltd | Arts & recreation | 2019 |
| Pickhurst Limited | Administrative & support | 2018 |
| Pickhurst Park Ltd | Other services | 2020 |
| Pickhurst Property Ltd | Households | 2025 |
| Pickhurst Surgery Partners LLP | | 2024 |
| Pickup Media Limited | Information & communication | 2015 |
| Pickwick Court Owners Association Limited | Households | 2003 |
| Picosoft AI Ltd | Information & communication | 2025 |
| Pictures & Messages Limited | Professional & scientific | 2017 |
| Pielle Fine Jewellery Limited | Manufacturing | 2025 |
| Pietras Aesthetics Limited | Other services | 2023 |
| Pike Property Investment Ltd | Real estate | 2021 |
| Pilates Body Studio Ltd | Administrative & support | 2010 |
| Pilgrims Management Company Limited | Households | 1991 |
| Pillay & Associates Limited | Professional & scientific | 2002 |
| Pilot Season Ltd | Information & communication | 2026 |
| PIM Delta Star Ltd | Construction | 2017 |
| Pinch Projects Ltd | Administrative & support | 2014 |
| Pine Lodge Care Home Limited | Health & social care | 2021 |
| Pine Villa Limited | Real estate | 2023 |
| Pinecone Strategy Limited | Professional & scientific | 2019 |
| Pineheat Limited | Construction | 2024 |
| Pinelands Close Enfranchisement Company Limited | Households | 2020 |
| Pinelands Close RTM Company Limited | Households | 2019 |
| Pinewood (Willow Grove) Management Limited | Real estate | 1968 |
| Pinewood Security Systems Limited | Construction | 2001 |
| Pinh on Bromley Limited | Hospitality | 2025 |
| Pink Events Catering Ltd | Hospitality | 2023 |
| Pinky Promise Events Ltd | Professional & scientific | 2024 |
| Pinky Promise Productions Ltd | Administrative & support | 2024 |
| Pinnacle Properties Hub Limited | Real estate | 2025 |
| Pinnacle Restoration Ltd | Manufacturing | 2012 |
| Pinnacle Search Ltd | Professional & scientific | 2026 |
| Pioneer Energy Solutions Limited | Construction | 2023 |
| Pioneer Kitchen and Bedroom Ltd | Manufacturing | 2020 |
| Pioneer Sales Corporation Ltd | Wholesale & retail | 2020 |
| Pioneer XI Ltd | Real estate | 2020 |
| Pipe COL Ltd | Real estate | 2016 |
| Pipe Designs Ltd | Construction | 2008 |
| Pipe Freezing UK Ltd | Construction | 2026 |
| Pipers House RTM Company Limited | Households | 2018 |
| Piraye Limited | Hospitality | 2017 |
| Pixablinx Ltd | Arts & recreation | 2020 |
| Pixel Space X Ltd | Professional & scientific | 2023 |
| PJ Classics Limited | Administrative & support | 2022 |
| PJ Modern Properties Limited | Real estate | 2024 |
| PJF Roofing Co. Ltd | Construction | 2007 |
| PJH Solicitors Limited | Professional & scientific | 2017 |