| Phoebe Lane Management Limited | Households | 2019 |
| Phoenix Aesthetics Clinic Ltd | Health & social care | 2026 |
| Phoenix Champ Properties Ltd | Real estate | 2024 |
| Phoenix Edge Limited | Administrative & support | 2008 |
| Phoenix Energy Resource Ltd | Professional & scientific | 2008 |
| Phoenix Estates (Milton Keynes) Limited | Real estate | 1996 |
| Phoenix Investing Ltd | Real estate | 2021 |
| Phoenix Life Care UK LLP | | 2024 |
| Phoenix Nova Ltd | Health & social care | 2025 |
| Phoenix Skin Clinic Limited | Health & social care | 2018 |
| Phoenix Specialist Contracting Ltd | Construction | 2008 |
| Phone Doctor MK Ltd | Wholesale & retail | 2026 |
| Phone Solutions Stafford Ltd | Wholesale & retail | 2024 |
| Phones A&E Limited | Wholesale & retail | 2025 |
| Photocopiers R US Ltd | Other services | 2010 |
| Photomatic Shop Limited | Professional & scientific | 2020 |
| Photon Limited | Hospitality | 2002 |
| Photoprotector Ltd | Other services | 2023 |
| Photostage Limited | Information & communication | 1989 |
| Phroneses Services Limited | Professional & scientific | 2011 |
| PHS Bathrooms Limited | Other services | 2018 |
| PHS Installations Limited | Other services | 2018 |
| PHV Cars Hire Ltd | Administrative & support | 2024 |
| Phyoda Limited | Wholesale & retail | 2016 |
| Physical 2 Digital Limited | Administrative & support | 2015 |
| PHYSIO4CURE Ltd | Real estate | 2011 |
| PHYSIO4FIT Ltd | Professional & scientific | 2011 |
| Physiolab Technologies Limited | Manufacturing | 2007 |
| Physiotherapy Visions Limited | Health & social care | 2016 |
| Physique Health MK Ltd | Other services | 2024 |
| Physix SM Limited | Health & social care | 2022 |
| PIA Consultants Limited | Financial services | 2010 |
| PIA Financial Group (East London) Limited | Financial services | 2019 |
| PIA Financial Group (Mayfair) Limited | Financial services | 2019 |
| PIA Financial Group (Partners) Limited | Financial services | 2022 |
| PIA Financial Group Limited | Financial services | 2015 |
| PIA Financial Solutions Limited | Extraterritorial | 2015 |
| PIA Holdings Limited | Financial services | 2017 |
| PIA Mayfair Properties 1 Limited | Real estate | 2025 |
| Pianissimo Holdings Limited | Education | 2019 |
| Piazza Courtyard Limited Partnership | | 2005 |
| Pick Pack Despatch Ltd | Transport & logistics | 2006 |
| Pickard & Richardson Ltd | Information & communication | 2021 |
| Picked World Gardens Ltd | Wholesale & retail | 2026 |
| Pickledilly Circus CIC | Arts & recreation | 2024 |
| Pickles Pet Pantry Ltd | Wholesale & retail | 2022 |
| Picko Ltd | Wholesale & retail | 2026 |
| Picksavvy Limited | Wholesale & retail | 2025 |
| Picobox Limited | Wholesale & retail | 2013 |
| Picturehouse Estates Ltd | Real estate | 2022 |
| Piea Ltd | Manufacturing | 2025 |
| Piece of Cake (London) Limited | Other services | 2012 |
| Piece of Zion Healthcare Ltd | Health & social care | 2021 |
| Pierremonts Car & Van Hire Limited | Administrative & support | 2007 |
| Pies and Crusts Ltd | Hospitality | 2025 |
| Piggy House Creative Ltd | Wholesale & retail | 2026 |
| Pikava Limited | Information & communication | 2026 |
| Pilates With RHE Ltd | Other services | 2025 |
| Pilera Projects Ltd | Construction | 2024 |
| Pillar Consulting Ltd | Professional & scientific | 2014 |
| Pillar Ledgers Limited | Professional & scientific | 2014 |
| Pime Property Limited | Real estate | 2019 |
| Pinak Art Limited | Information & communication | 2024 |
| Pinakálone Ltd | Manufacturing | 2024 |
| Pinbrook House Limited | Hospitality | 2010 |
| Pincott Properties Limited | Real estate | 2017 |
| Pincott Properties Trading Limited | Hospitality | 2025 |
| Pinders Professional and Consultancy Services Limited | Professional & scientific | 1996 |
| Pindla Limited | Construction | 2013 |
| Pindle Ltd | Real estate | 2022 |
| Pine Haven Estates Limited | Real estate | 2017 |
| Pineham Fish & Chips Ltd | Hospitality | 2019 |
| Pinewood Residences Limited | Real estate | 2023 |
| Pinewoods Technology UK Limited | Wholesale & retail | 2022 |
| Pingin Group Ltd | Real estate | 2026 |
| Pink & Pear Limited | Other services | 2019 |
| Pink Ivory Limited | Wholesale & retail | 2024 |
| Pink Jellybean Ltd | Information & communication | 2011 |
| Pink Party Events Ltd | Administrative & support | 2026 |
| Pink Pigeon Trading Co. Limited | | 2010 |
| Pink Ribbon Diagnostics Ltd | Health & social care | 2026 |
| Pink Wave Services Limited | Professional & scientific | 2025 |
| Pinks Syrups Limited | Manufacturing | 2006 |
| Pinnacle Asset Finance Ltd | Financial services | 2023 |
| Pinnacle Global Services Limited | Information & communication | 2023 |
| Pinnacle Roofing Services Ltd | Construction | 2019 |
| Pinnacle Timber Construction Ltd | Construction | 2021 |
| Pinnacle Total Ltd | Health & social care | 2024 |
| Pinpoint Plumbing and Heating Solutions Ltd | Construction | 2025 |
| Pinsent Printing Limited | Manufacturing | 2019 |
| Pinturicchio Limited | Financial services | 2025 |
| Pinup Limited | Information & communication | 2006 |
| Pioneer House (Industrial) Limited | Real estate | 2025 |
| Pioneer House (Residential) Limited | Real estate | 2025 |
| Pioneer House Industrial Holdings Limited | Real estate | 2025 |
| Pioneer House Residential Holdings Limited | Real estate | 2025 |
| Pioneer Optimisation Limited | Information & communication | 2025 |
| Pioneer Productions Ltd | Information & communication | 2017 |
| Pioneer Transport Ltd | Transport & logistics | 2022 |
| Pipeguardian Robotics Ltd | Other services | 2024 |