| Pipeline Fusion Services Limited | Construction | 2018 |
| Pipen Group Ltd | Information & communication | 2025 |
| Pippin Enterprises Limited | Real estate | 1969 |
| Pipping Financial Planning Ltd | Financial services | 2021 |
| Piran Consulting Limited | Information & communication | 2013 |
| Pirie TM Ltd | Construction | 2024 |
| Piripiri AMS Catering Ltd | Hospitality | 2018 |
| PIS Consulting Ltd | Information & communication | 2025 |
| Pisa Research Limited | Professional & scientific | 2018 |
| Pistol Star Ltd | Transport & logistics | 2017 |
| Pistris Limited | Information & communication | 2017 |
| Pitacs Limited | Wholesale & retail | 1990 |
| Pitarzi Consulting Limited | Real estate | 2018 |
| Pitch Experts Ltd | Education | 2025 |
| Pitch Predict AI Limited | Information & communication | 2026 |
| Pitmaston Apartments Ltd | Hospitality | 2014 |
| Pitmaston Apartments Management Company Limited | Households | 2025 |
| Pitstop Pro MK Ltd | Wholesale & retail | 2025 |
| Pitwall Ltd. | Arts & recreation | 2015 |
| Pixel Plaza Ltd | Professional & scientific | 2025 |
| Pixelbloom Creative Studio Limited | Professional & scientific | 2025 |
| Pixelseventyfour Ltd | Information & communication | 2011 |
| Pixelshr Ltd | Information & communication | 2008 |
| Pixi Shops Ltd | Information & communication | 2025 |
| Pixytech Limited | Information & communication | 2012 |
| Pizza Adriano Limited | Hospitality | 2025 |
| Pizza Tezza Ltd | Hospitality | 2019 |
| Pizzaqtr UK Limited | Hospitality | 2022 |
| PJ Allen Consultancy Services Limited | Professional & scientific | 2023 |
| PJ Build Ltd | Construction | 2020 |
| PJ Care Developments Limited | Real estate | 2002 |
| PJ Corp Stores Limited | Hospitality | 2023 |
| PJ MK Wolverton Limited | Hospitality | 2018 |
| PJ Sawbridge & Sons (Farming) Ltd | Agriculture & fishing | 2025 |
| PJ Sawbridge & Sons Limited | Agriculture & fishing | 2017 |
| PJA Alpha Company Ltd | Administrative & support | 2023 |
| PJB Health & Living Limited | Information & communication | 2025 |
| PJB Partnership Ltd | Administrative & support | 2026 |
| PJH Group Holdings Ltd | Financial services | 2021 |
| PJM Partners Ltd | Real estate | 2019 |
| PJM Property Holdings Ltd | Real estate | 2016 |
| Pjpb Associates Limited | Professional & scientific | 2010 |
| PJR Legal Services Limited | Professional & scientific | 2025 |
| PK Continental International Limited | Real estate | 2024 |
| PK Nexus Ltd | Professional & scientific | 2026 |
| PKD IT Consultancy Ltd | Information & communication | 2018 |
| PKN Investments Ltd | Real estate | 2025 |
| PKN Limited | Financial services | 2025 |
| PKN Properties Ltd | Real estate | 2025 |
| PKS Estates Ltd | Real estate | 2020 |
| PKS Walnut Investments Ltd | Real estate | 2025 |
| PL Watson Holdings Limited | Transport & logistics | 2019 |
| PL Watson Properties Limited | Real estate | 2019 |
| Place & Co UK Ltd | Professional & scientific | 2026 |
| Place Partnership Limited | Construction | 2015 |
| Placemed Consultancy Ltd | Professional & scientific | 2019 |
| Placing Talent Limited | Administrative & support | 2023 |
| Plan Healthcare Services Ltd | Health & social care | 2014 |
| Plan My Tour Ltd | Administrative & support | 2018 |
| Plan-At Ltd | Professional & scientific | 2021 |
| Plan-B Brand Solutions Limited | Wholesale & retail | 2013 |
| Planet Accountant Ltd | Professional & scientific | 2006 |
| Planet Edeniga Limited | Public administration | 2022 |
| Planet Protection Ltd | Information & communication | 2024 |
| Planet Side Limited | Information & communication | 2007 |
| Planet Sportz UK Ltd | Information & communication | 2024 |
| PLANNET21 Communications Limited | Information & communication | 2019 |
| Planning Systems Ltd | Professional & scientific | 2019 |
| Planted Evidence Ltd | Wholesale & retail | 2020 |
| Plantit UK & Ireland Ltd | Arts & recreation | 2022 |
| Plast - Assist Ltd | Professional & scientific | 2022 |
| Plastchim International Ltd | Administrative & support | 2018 |
| Plastics Fabrication & Printing Limited | Manufacturing | 1953 |
| Plataforma Ltd | Financial services | 2022 |
| Plate Devils Limited | Wholesale & retail | 2024 |
| Platinum EME Ltd | Professional & scientific | 2011 |
| Platinum Enclosures Limited | Wholesale & retail | 2024 |
| Platinum Kitchen & Bathroom Installations Ltd | Construction | 2022 |
| Platinum MK Limited | Water & waste | 2021 |
| Platinum Plant Solutions Limited | Administrative & support | 2023 |
| Platinum Projects & Solutions Ltd | Wholesale & retail | 2018 |
| Platinum Projects MK Ltd | Construction | 2025 |
| Platnik Solutions Ltd | Information & communication | 2026 |
| Plato Racing Ltd | Professional & scientific | 2025 |
| Plava Consulting Limited | Information & communication | 2022 |
| Play Lane MK Ltd | Arts & recreation | 2025 |
| Play Source Limited | Arts & recreation | 2018 |
| Playbook Social Ltd | Administrative & support | 2011 |
| Playful Pottery Ltd | Arts & recreation | 2018 |
| Playtime PR Ltd | Professional & scientific | 2014 |
| Playtime Sports Education UK Limited | Education | 2026 |
| Plazpartz Limited | Manufacturing | 2017 |
| Plcc Engineering and Property Limited | Professional & scientific | 2025 |
| Pleasant Services Ltd | Administrative & support | 2017 |
| Pleasant Sheep Ltd | Wholesale & retail | 2025 |
| Pleo Reachout Organisation CIC | Health & social care | 2024 |
| Plethora Marketing Limited | Professional & scientific | 2019 |
| Plethro Limited | Education | 2015 |
| Plexinor Technologies Ltd | Information & communication | 2020 |
| Plexus Consultancy Services Ltd | Professional & scientific | 2021 |