| Plexus Property Limited | Real estate | 2019 |
| Plns Homes Ltd | Administrative & support | 2019 |
| Plockmatic Group UK Limited | Manufacturing | 1977 |
| Plot 61 Ltd | Hospitality | 2022 |
| Plough Developments Limited | Construction | 2000 |
| Pluckncollect Ltd | Other services | 2024 |
| Plufficollections Ltd | Wholesale & retail | 2026 |
| Plumb GAS Solutions Ltd | Construction | 2015 |
| Plumbing & GAS Solutions Limited | Construction | 2010 |
| Plumbing Collective Limited | Construction | 2026 |
| Plumbing MK Ltd | Construction | 2026 |
| Plumbmaster Heating Limited | Construction | 2019 |
| Plumbworxc Ltd | Construction | 2020 |
| Plumcot Ltd | Wholesale & retail | 2023 |
| Plumstead Funding Limited | Financial services | 2013 |
| Plumtrans Limited | Transport & logistics | 2025 |
| Plus 263 Ltd | Health & social care | 2023 |
| PLUS234 Limited | Hospitality | 2023 |
| PLUS2DELTA Ltd | Professional & scientific | 2023 |
| Plusma Ltd | Real estate | 2023 |
| Plusvantage Limited | Professional & scientific | 2010 |
| Pluto Care Ltd | Health & social care | 2025 |
| Pluxee UK Ltd | Professional & scientific | 1992 |
| Plx.Mk Limited | Manufacturing | 2026 |
| PM Construction (UK) Limited | Construction | 2003 |
| PM ORO Services Ltd | Manufacturing | 2023 |
| PM Studios Ltd | Professional & scientific | 2021 |
| Pm-Aid Properties Limited | Financial services | 2025 |
| Pmak Ltd | Health & social care | 2012 |
| PMB 27 Ltd | Real estate | 2019 |
| PMC Ventures India Ltd | Financial services | 2024 |
| PMC Ventures Limited | Financial services | 2016 |
| PMC Ventures Property Ltd | Financial services | 2024 |
| Pmcd Sports Media Limited | Information & communication | 2012 |
| PMD Construction (MK) Limited | Construction | 2009 |
| PMD Consultancy Ltd | Professional & scientific | 2025 |
| Pmgpartyhire Limited | Wholesale & retail | 2014 |
| PMK Trans Limited | Transport & logistics | 2015 |
| Pmpsports Ltd | Arts & recreation | 2026 |
| PMR Cleaning UK Limited | | 2005 |
| PMR Transport Limited | Transport & logistics | 2023 |
| PMS Purevue Limited | Construction | 2022 |
| PMT Property Management Team Limited | Hospitality | 2004 |
| PN Components & Logistics Ltd | Transport & logistics | 2018 |
| PN Tools Ltd | Wholesale & retail | 2025 |
| PNB Homes Limited | Real estate | 2022 |
| PNB Mobile Limited | Information & communication | 2009 |
| PNK Sland Sushi Bar Limited | Hospitality | 2024 |
| POB 78 Limited | Health & social care | 2021 |
| Pocket Full of Posies Limited | Wholesale & retail | 2015 |
| Poco Group Ltd | Construction | 2024 |
| Pocr Ltd | Information & communication | 2022 |
| Podium PCL Ltd | Wholesale & retail | 2023 |
| Point Blank Shooting Ltd | Arts & recreation | 2025 |
| Point Zenith Ltd | Information & communication | 2021 |
| Pojac Projects Ltd | Information & communication | 2014 |
| Pokemart Collectables Ltd | Manufacturing | 2026 |
| Pokey Ltd | Administrative & support | 2013 |
| Poks Global Limited | Hospitality | 2020 |
| Poladroid Limited | Extraterritorial | 2008 |
| Polamb Products Limited | Wholesale & retail | 2015 |
| Polar Edge Limited | Information & communication | 2022 |
| Polar Star International Limited | Wholesale & retail | 2001 |
| Polaris Energy Technology Limited | Professional & scientific | 2025 |
| Polarteknik UK Ltd | Manufacturing | 2025 |
| Polfix Limited | Construction | 2018 |
| Policytown Ltd | Financial services | 2024 |
| Polience Limited | Administrative & support | 2020 |
| Polishworks Detailing Limited | Wholesale & retail | 2025 |
| Pollards MK Limited | Wholesale & retail | 2025 |
| Pollys Yard Management Company Limited | Households | 2000 |
| Polskie Eventy W UK Ltd | Hospitality | 2026 |
| Polygon Bakery Ltd | Wholesale & retail | 2022 |
| Polymer Science Europe Ltd | Extraterritorial | 2012 |
| Polytech Health & Aesthetics UK Ltd | Wholesale & retail | 2025 |
| Polyvid Ltd | Other services | 2023 |
| Pomaah Healthcare Professional Ltd | Health & social care | 2026 |
| Ponentine Seven Limited | Administrative & support | 2005 |
| Ponting Property Limited | Real estate | 2024 |
| Pooleyville Limited | Professional & scientific | 2020 |
| Poolla Ltd | Transport & logistics | 2025 |
| Poorly Paws Limited | Wholesale & retail | 2023 |
| POP Electrical and Fire Limited | Construction | 2026 |
| POP Goes the Pixel Ltd | Information & communication | 2014 |
| Pop-I-Seven Limited | Extraterritorial | 2009 |
| Popeye Seven Limited | Wholesale & retail | 2009 |
| Popkakery Products Limited | Manufacturing | 2013 |
| Popmar Services Ltd | Administrative & support | 2025 |
| Popnshop Limited | Wholesale & retail | 2025 |
| Poppy Bidco Limited | Financial services | 2024 |
| Poppy Lane Management Limited | Construction | 2021 |
| Poppy Media Limited | Administrative & support | 2021 |
| Poppy Midco Limited | Financial services | 2024 |
| Poppy Topco Limited | Financial services | 2024 |
| Porcelain Film Limited | Information & communication | 2004 |
| Porcé Ltd | Wholesale & retail | 2026 |
| Porodzinska Ltd | Health & social care | 2023 |
| Port-Ago Homes Limited | Real estate | 2026 |
| Porta Studios Ltd | Information & communication | 2014 |
| Portable Cold Storage Limited | Professional & scientific | 1992 |