| Phocus Data Services Limited | Information & communication | 1999 |
| Phoenix Canoe Club Limited | Arts & recreation | 2012 |
| Phoenix Care Holdings Limited | Professional & scientific | 2005 |
| Phoenix Commodity Trading and Consulting Limited | Construction | 2004 |
| Phoenix Crankshafts Ltd | Manufacturing | 2019 |
| Phoenix E Cigs Ltd | Wholesale & retail | 2023 |
| Phoenix Forklifts Ltd | Extraterritorial | 2019 |
| Phoenix Healthcare Limited | Health & social care | 1993 |
| Phoenix Lift Trucks Limited | Manufacturing | 2005 |
| Phoenixse Ltd | Financial services | 2024 |
| Phoerus Consultancy Limited | Information & communication | 2017 |
| Phoods Limited | Other services | 2004 |
| Phronetic Consulting Limited | Professional & scientific | 2016 |
| Picasso Logistics Ltd | Transport & logistics | 2020 |
| Pick a Pack Store Ltd | Wholesale & retail | 2026 |
| Pick and Shovel Ltd | Hospitality | 2026 |
| Pickford Pre-Cast Concrete Limited | Manufacturing | 2009 |
| Picklemix Events Limited | Arts & recreation | 2025 |
| Pico Padel Ltd | Wholesale & retail | 2025 |
| Picture House Special Effects Ltd | Professional & scientific | 2023 |
| Pictures Management Ltd | Arts & recreation | 2011 |
| Pier Ceccarelli Counselling Services Limited | Health & social care | 2012 |
| Pier Ceccarelli Investments Limited | Real estate | 2021 |
| Pigeon Productions Limited | Information & communication | 2015 |
| Pilates PT Limited | Other services | 2017 |
| Pilgrim's Food Masters Holdings Limited | Financial services | 2021 |
| Pillars Autos Ltd | Wholesale & retail | 2026 |
| Pillarstone Group Limited | Financial services | 2025 |
| Pimara Properties Limited | Real estate | 2016 |
| PIN Stream Ltd | Hospitality | 2018 |
| Pinage Holdings Ltd | Information & communication | 2025 |
| Pinchpoint Limited | Administrative & support | 2013 |
| Pinedene Builders Limited | Construction | 1978 |
| Pinehurst Care Limited | Health & social care | 1995 |
| Pinehurst Stanmore Management Ltd | Real estate | 2007 |
| Pinewood Lodge Management Company Limited | Real estate | 1986 |
| Ping London Ltd | Financial services | 2018 |
| Ping Services Ltd | Transport & logistics | 2019 |
| Ping Technology Group Limited | Administrative & support | 2025 |
| Pininski Group Limited | Health & social care | 2023 |
| Pink Borehamwood Limited | Hospitality | 2022 |
| Pink Elephant Productions Limited | Administrative & support | 2019 |
| Pink Jaipur Limited | Health & social care | 2019 |
| Pink Scoop UK Ltd | Hospitality | 2012 |
| Pinknews Group Limited | Financial services | 2020 |
| Pinknews Media Ltd | Information & communication | 2005 |
| Pinnacle Insurance Limited | Financial services | 1971 |
| Pinnacle Insurance Management Services Limited | Administrative & support | 1992 |
| Pinnacle UK Investments Ltd | Real estate | 2016 |
| Pion Design Ltd | Professional & scientific | 2024 |
| PIP FOX Limited | Information & communication | 2014 |
| Piramide Facade Ltd | Construction | 2025 |
| Pita Gyros Ltd | Hospitality | 2019 |
| Pita Royale Ltd | Manufacturing | 2019 |
| Pitch XV Ltd | Construction | 2019 |
| Pitchers Sports Bar & Grill Ltd | Hospitality | 2019 |
| Pitchoworld Ltd | Wholesale & retail | 2018 |
| Pitstop for Business Limited | Information & communication | 2011 |
| Pitta Hub EAT Ltd | Hospitality | 2023 |
| Pittas Properties Limited | Real estate | 1978 |
| Pittville Building Company Ltd | Construction | 2016 |
| Pivix Ltd | Professional & scientific | 2025 |
| Pivoteers Ltd | Information & communication | 2023 |
| Piwee Design Ltd | Arts & recreation | 2026 |
| Pixel PWR Ltd | Information & communication | 2024 |
| Pixie SK Limited | Professional & scientific | 2019 |
| Pizza Factory & Co London Ltd | Hospitality | 2019 |
| Pizza PAD Ltd | Hospitality | 2025 |
| PJ Management Services Limited | Real estate | 2013 |
| PJ Nixon & SON Limited | Construction | 2003 |
| PJB Electrical Contractors Ltd | Construction | 2019 |
| PJB Housing Limited | Real estate | 2017 |
| PJG Grips Limited | Information & communication | 2012 |
| PKF Europe Ltd | Wholesale & retail | 2003 |
| PKF Group Ltd | Wholesale & retail | 2003 |
| PKF Universal Limited | Wholesale & retail | 2003 |
| Placeholder Films Ltd | Information & communication | 2024 |
| Placeme Recruitment Ltd | Administrative & support | 2025 |
| Plan IT Builders Ltd | Construction | 2023 |
| Plan-It Interiors Ltd | Administrative & support | 2004 |
| Plane Sense Aviation Limited | Transport & logistics | 2004 |
| Plank Limited | Construction | 2015 |
| Plank London Ltd | Real estate | 2020 |
| Planop Ltd | Professional & scientific | 2024 |
| Plastering Services Ltd | Construction | 2025 |
| Plastic Surgery Services Limited | Real estate | 1997 |
| Plata 47 Limited | Administrative & support | 2022 |
| Plate Expert Ltd | Wholesale & retail | 2024 |
| Platinum Gates Limited | Wholesale & retail | 2018 |
| Platinum Lace (Management) Limited | Real estate | 2008 |
| Plaxton BUS and Coach Limited | Professional & scientific | 1970 |
| Playhouse Entertainments Limited | Hospitality | 2008 |
| Plexton Limited | Hospitality | 2025 |
| PLK Design Ltd | Professional & scientific | 2014 |
| PLK Services Limited | Information & communication | 2021 |
| Plug & Play Promotions Limited | Administrative & support | 2011 |
| Plum Networks Ltd | Other services | 2022 |
| Plumb-Tech (Herts) Ltd | Construction | 2018 |
| Plumtree Capital Limited | Financial services | 2010 |
| Pluseo Ltd | Professional & scientific | 2025 |