| Peek Developments (Potten END) Limited | Real estate | 2018 |
| Pegasus Design Crafts Ltd | Wholesale & retail | 2025 |
| Pegasus Limited | Professional & scientific | 1985 |
| Pelefix Ltd | Construction | 2025 |
| Pely Services and Maintenance Ltd | Construction | 2017 |
| Pemtech ARC Limited | Wholesale & retail | 2009 |
| Pendino Limited | Hospitality | 2025 |
| Pendy Designs Limited | Professional & scientific | 2023 |
| Penguin Trans Ltd | Transport & logistics | 2026 |
| Pent Avenue Limited | Real estate | 2024 |
| Penuelway Limited | Real estate | 2026 |
| Peonies Aesthetics Ltd | Other services | 2025 |
| Perfect Personalised Cakes Limited | Wholesale & retail | 2026 |
| Perfect Personalised Parties UK Ltd | Wholesale & retail | 2016 |
| Perfect Wellness Ltd | Wholesale & retail | 2019 |
| Perfectcinc Ltd | Wholesale & retail | 2020 |
| Performance Workflow Limited | Information & communication | 2012 |
| Peridot Paws Ltd | Wholesale & retail | 2018 |
| Permanently Beautiful Ltd | Other services | 2022 |
| Permanently Successful Ltd | Professional & scientific | 2024 |
| Peter Davidson Consultancy Limited | Administrative & support | 2010 |
| Peter Davidson Software Ltd | Information & communication | 2020 |
| Peter Evans Studios Trading Limited | Arts & recreation | 2016 |
| Peter M. Smith Limited | Professional & scientific | 2000 |
| Peterborough Car Services Ltd | Wholesale & retail | 2024 |
| Peterborough Dine Ltd | Hospitality | 2023 |
| Petroleum Ocean Limited | Administrative & support | 2003 |
| PGC Properties Ltd | Other services | 2017 |
| PGR Decorations LLP | | 2018 |
| Phagef Ltd | Other services | 2024 |
| Phanfair Holdings Limited | Construction | 2017 |
| Pharmacy Blockchain Ltd | Information & communication | 2017 |
| Pharmaqual Solutions Limited | Professional & scientific | 2025 |
| Phase Forward Talent Ltd | Administrative & support | 2026 |
| Philanthropy Impact Forum Limited | Professional & scientific | 2026 |
| Philip Brown Services Limited | Administrative & support | 1995 |
| Phillip Cane Partnership LLP | | 2023 |
| Phillips Vehicle Services Limited | Wholesale & retail | 2011 |
| Phoebe Day Designs Ltd | Professional & scientific | 2020 |
| Phoenix Chinese Cuisine Limited | Hospitality | 2026 |
| Phoenix Dragon Ltd | Hospitality | 2026 |
| Phoenix Group Services (Luton) Ltd | Construction | 2015 |
| Phoenix Heating (Luton) Limited | Construction | 1984 |
| Phoenix Limited | Professional & scientific | 1990 |
| Phoenix Park Block 8 Property Management Company Limited | Households | 2024 |
| Phoenix Repair Services Ltd | Construction | 2021 |
| Phoenix Resprays Limited | Construction | 2025 |
| Phone World Ltd | Wholesale & retail | 2019 |
| Phonus Insurance Services Limited | Financial services | 1991 |
| Photography by Carrie Ltd | Professional & scientific | 2026 |
| Physiplay Ltd | Health & social care | 2023 |
| PIC Shuttering Ltd | Construction | 2019 |
| Pica Property Developments Ltd | Construction | 2025 |
| Pickett Propmakers Limited | Extraterritorial | 2011 |
| Pickett Shopfitters Limited | Construction | 2000 |
| Pickford Property Management Ltd | Real estate | 2005 |
| Picksp Caring Ltd | Health & social care | 2020 |
| PIE and Belle Limited | Education | 2019 |
| Pifa Properties Limited | Real estate | 2023 |
| Piggott's Poultry Breeders Ltd | Agriculture & fishing | 2013 |
| Pikes Soft Ltd | Information & communication | 2022 |
| Pine Healthcare Limited | Health & social care | 2022 |
| Pineapple Cleaning Limited | Administrative & support | 2016 |
| Pineapple Property Services Limited | Administrative & support | 2015 |
| Pineland Properties Limited | Real estate | 2003 |
| Pink Fort Limited | Wholesale & retail | 2021 |
| Pinners Private Limited | Administrative & support | 2018 |
| Pinpoint OUT of Home Media Limited | Professional & scientific | 2010 |
| Pioneer 2020 Limited | Real estate | 2020 |
| Piorun Ltd | Transport & logistics | 2016 |
| Pipa Trans Ltd | Transport & logistics | 2023 |
| Piri Piri Dons Limited | Hospitality | 2017 |
| Pistaseb Ltd | Transport & logistics | 2024 |
| Pivi Logistics Ltd | Transport & logistics | 2019 |
| Pivi Website Ltd | Information & communication | 2021 |
| Pixie Red Limited | Other services | 2020 |
| PJK Connections Ltd | Construction | 2011 |
| PJK Data Services Ltd | Construction | 2018 |
| PJK Lettings Ltd | Real estate | 2021 |
| PJM UK Agencies Ltd | Wholesale & retail | 2023 |
| Pjmn Enterprises Ltd | Education | 2010 |
| PK Design and Build Ltd | Construction | 2022 |
| PKO Care Ltd | Administrative & support | 2020 |
| PL Holdings Limited | Financial services | 2019 |
| Plain Talking HR Limited | Administrative & support | 2009 |
| Planck Survey Ltd | Construction | 2021 |
| Plantmasters Limited | Administrative & support | 2007 |
| Platinum Express Couriers Limited | Transport & logistics | 2018 |
| Platinum Movers Ltd | Transport & logistics | 2025 |
| Platsolutions Limited | Professional & scientific | 2017 |
| PLB Medical Limited | Health & social care | 2021 |
| Pleasant Hospitality Limited | Hospitality | 2013 |
| Pleasant Places Cleaning Ltd | Administrative & support | 2026 |
| Ploughwood Joinery and Construction Ltd | Construction | 2009 |
| PLS Chicken Limited | Health & social care | 2014 |
| Plugged in Solutions & Services Ltd | Information & communication | 2021 |
| Plumbcare Solutions Ltd | Wholesale & retail | 2018 |
| Plumbing & GAS Solutions by John Ltd | Construction | 2025 |
| Plus Business Systems Limited | Information & communication | 1980 |
| Pluto's House Limited | Real estate | 2023 |