| P Murphy Plant Ltd | Construction | 2011 |
| P R Catering Limited | Hospitality | 1999 |
| P&A Investment Properties Ltd | Real estate | 2022 |
| P&H London Ltd | Construction | 2018 |
| P&J Entertainment Ltd. | Arts & recreation | 1999 |
| P&M Treatments Limited | Other services | 2021 |
| P&P BUD LP | | 2021 |
| P. Holdings Limited | Other services | 2003 |
| P. J. Johnson & Company (Timber) Limited | Wholesale & retail | 1983 |
| P.J. Bridgman & Company Limited | Manufacturing | 1977 |
| P.V.S. DRY Cleaners Ltd | Other services | 2024 |
| P250+ LP | | 2016 |
| P350+ LP | | 2016 |
| PA Education Ltd | Education | 2018 |
| Pacck Ltd | Wholesale & retail | 2024 |
| Pace Global Investments Ltd | Real estate | 2022 |
| Package-In Limited | Professional & scientific | 2005 |
| Packaging Promotions & Design Limited | Wholesale & retail | 2001 |
| Pafandi UK Ltd | Administrative & support | 2013 |
| Paige Sullivan Ltd | Information & communication | 2023 |
| Paimio Limited | Wholesale & retail | 2011 |
| Paint Connect Limited | Construction | 2010 |
| Paint-R Ltd | Construction | 2024 |
| PAK Rides London Ltd | Transport & logistics | 2025 |
| Pakoz Meat Ltd | Wholesale & retail | 2019 |
| Palace Dairies Ltd | Wholesale & retail | 2003 |
| Palm Avenue Healthcare Limited | Health & social care | 2019 |
| Palo Atas Ltd | Real estate | 2025 |
| Palo Cleaning UK Limited | Administrative & support | 2021 |
| Pam-Eagle Health Care Ltd | Health & social care | 2023 |
| Pamicon Minor Metals Limited | Mining & quarrying | 2002 |
| Pamuk Property Limited | Real estate | 2025 |
| Pancake Master Championship 2025 Limited | Information & communication | 2025 |
| Pancamo Plumbing & Heating Ltd | Construction | 2020 |
| Pand Solutions Ltd | Professional & scientific | 2025 |
| Panda LDN Ltd | Wholesale & retail | 2019 |
| Pando Global Limited | Wholesale & retail | 2023 |
| Panko Ltd | Construction | 2021 |
| Pannonia Consulting Ltd | Professional & scientific | 2023 |
| Papa Enfield Indian Restaurant Ltd | Hospitality | 2024 |
| Paprika Enfield Ltd | Hospitality | 2023 |
| Papyjay Consultings Ltd | Administrative & support | 2025 |
| PAR Lakes Care Limited | Health & social care | 2025 |
| PAR Lakes Holdings Limited | Financial services | 2025 |
| PAR Lakes Properties Limited | Real estate | 2023 |
| Paradise 65 Limited | Hospitality | 2019 |
| Paradise Care Homes Limited | Health & social care | 2010 |
| Paradise Food & Wine Ltd | Wholesale & retail | 2022 |
| Paradise Nails Limited | Other services | 2016 |
| Paragon Glass Services Ltd | Manufacturing | 1997 |
| Paragonqms Ltd | Professional & scientific | 2015 |
| Paramount Asset Ltd | Professional & scientific | 2021 |
| Paraton Properties Limited | Construction | 1972 |
| Parcel Team UK Ltd | Transport & logistics | 2021 |
| Parcel Yard Press LLP | | 2020 |
| Parente Properties Ltd | Real estate | 2025 |
| Pareto and Flow Ltd | Professional & scientific | 2026 |
| Paris Kyri Gowns Ltd | Manufacturing | 2002 |
| Park Road Housing Limited | Hospitality | 2019 |
| Parker Print Services Limited | Manufacturing | 2011 |
| Parker TEE Jones Building Services Ltd | Construction | 2025 |
| Parkes Plumbing Ltd | Construction | 2025 |
| Parkes&Goldings Limited | Real estate | 2022 |
| Parkhurst Road Limited | Real estate | 2013 |
| Parking Xpert Ltd | Transport & logistics | 2025 |
| Parsonage Properties Ltd | Real estate | 2023 |
| Partners Holdings LP | | 2018 |
| Party’S Here Ltd | Wholesale & retail | 2021 |
| PAS Sound Goods Limited | Arts & recreation | 2013 |
| Pasa Meat Ltd | Wholesale & retail | 2026 |
| Pash Consulting Ltd | Professional & scientific | 2016 |
| Pasha Pets Ltd | Manufacturing | 2025 |
| Pasha Shisha Lounge Ltd | Hospitality | 2018 |
| Pashtun Organisation | Health & social care | 2021 |
| Passion Hair Boutique Ltd | Other services | 2015 |
| Passive Homes AS LP | | 2016 |
| Pastor Cafe Ltd | Other services | 2025 |
| Patch PAY Ltd | Information & communication | 2022 |
| Patchwork Comms Ltd | Professional & scientific | 2025 |
| Pathivara Jewellery UK Limited | Wholesale & retail | 2023 |
| Pathos Business and Sports Consultants Ltd | Administrative & support | 2024 |
| Pathway Care & Support Limited | Health & social care | 2004 |
| Pathway in Care Ltd | Transport & logistics | 2025 |
| Patmos Group Ltd | Professional & scientific | 2023 |
| Patos Construction Ltd | Construction | 2012 |
| Patrick ANN Limited | Real estate | 2006 |
| Patrick's Papanasi Ltd | Hospitality | 2024 |
| Paul BS Cleaning Limited | Administrative & support | 2023 |
| Paul Scholes Limited | Other services | 1996 |
| Paul Winston Limited | Professional & scientific | 2002 |
| Paulserves Ltd | Professional & scientific | 2025 |
| Pauly Building Ltd | Construction | 2023 |
| Pavel London Services Ltd | Construction | 2022 |
| Pavross Limited | Hospitality | 2024 |
| Pawfect Pet Care Ltd | Professional & scientific | 2023 |
| Pawkins Limited | Information & communication | 2021 |
| Pawlab Limited | Wholesale & retail | 2026 |
| Paws Media Ltd | Information & communication | 2024 |
| PAX & Noah Limited | Other services | 2019 |
| Paximum UK Ltd | Information & communication | 2019 |