| PG Jermy Limited | Construction | 2006 |
| PG Masonry Conservation Ltd | Construction | 2024 |
| PGA Construction Services Limited | Construction | 2014 |
| PGI Acquisition Limited | Manufacturing | 2013 |
| Pguk Limited | Professional & scientific | 2007 |
| PH Content Ltd | Administrative & support | 2016 |
| PH Sport UK Limited | Administrative & support | 2025 |
| Phakorn Limited | Construction | 2022 |
| Phantom Audio Ltd | Arts & recreation | 2025 |
| Phantom Boatworks Ltd | Hospitality | 2021 |
| Pharaoh Auto Export Import Ltd | Wholesale & retail | 2024 |
| Pharma LEE Ltd | Health & social care | 2021 |
| Pharmaboardroom Limited | Information & communication | 2018 |
| Pharmaco (Merseyside) Limited | Financial services | 2016 |
| Pharmaco (Norfolk) Limited | Financial services | 2012 |
| Pharmaco (Suffolk) Limited | Financial services | 2012 |
| Pharmaco Partnership Limited | Wholesale & retail | 2016 |
| Pharmstar Ltd | Other services | 2025 |
| Pharmvi Ltd | Information & communication | 2020 |
| Pharos Business Services Limited | Professional & scientific | 1994 |
| Phase 2 GAS Holdings Limited | Administrative & support | 2016 |
| Phasealign Limited | Professional & scientific | 2026 |
| Phased in Cable Jointing Specialists Ltd | Construction | 2015 |
| Phasefield Electrical Limited | Construction | 2021 |
| Phaseolus Growers Limited | Extraterritorial | 2010 |
| Phaseolus Limited | Manufacturing | 2001 |
| PHC Digital Ltd | Information & communication | 2018 |
| Phil Brown Offshore Maintenance Ltd | Professional & scientific | 2012 |
| Phil Churchman and Company Limited | Professional & scientific | 2005 |
| Phil Oddy Financial Solutions Limited | Financial services | 2020 |
| Phil RIX & Sons Limited | Construction | 2015 |
| Philadelphia Finance Ltd | Wholesale & retail | 2023 |
| Philip Care Ltd | Health & social care | 2018 |
| Philip Goddard Ltd | Administrative & support | 2016 |
| Philip Hunt Antique Dealers Ltd | Administrative & support | 2011 |
| Philip Waller Consulting Limited | Information & communication | 2015 |
| Philip Webster Gunsmiths Limited | Other services | 2011 |
| Phill Clark (Contract Haulier) Limited | Transport & logistics | 2017 |
| Phillip Jeans Homes Limited | Construction | 2006 |
| Phillip Keenan Garden Service Limited | Administrative & support | 2003 |
| Phillippa Kirby LLP | | 2015 |
| Philpott Demolition & Recycling (East Anglia) Ltd | Construction | 2024 |
| Phinix Consultancy Ltd | Education | 2023 |
| Phish Enterprises Ltd | Wholesale & retail | 2024 |
| Phlair Consultants Limited | Administrative & support | 2015 |
| Phoebe Code Limited | Information & communication | 2020 |
| Phoenix Bird Holdings Ltd | Financial services | 2026 |
| Phoenix Car Keys Ltd | Wholesale & retail | 2024 |
| Phoenix Career Solutions Ltd | Education | 2026 |
| Phoenix Case Goods Ltd | Manufacturing | 2023 |
| Phoenix Events (East) Ltd | Administrative & support | 2018 |
| Phoenix Gym Norwich Ltd | Arts & recreation | 2013 |
| Phoenix Innovations Limited | Manufacturing | 2010 |
| Phoenix Motor Group UK Ltd | Wholesale & retail | 2022 |
| Phoenix Needles Ltd | Wholesale & retail | 2021 |
| Phoenix OIL & GAS Engineering Services Limited | Professional & scientific | 2007 |
| Phoenix Services Norfolk Limited | Manufacturing | 2026 |
| Phoenix Success Ltd | Administrative & support | 2023 |
| Phoenixwave Limited | Health & social care | 2023 |
| Phonehub IO Ltd | Information & communication | 2015 |
| Photo Booth Events Hire Limited | Other services | 2022 |
| Photo Elite Limited | Professional & scientific | 2003 |
| Photography Package Payments Ltd | Arts & recreation | 2020 |
| Photomec (Holdings) Limited | Professional & scientific | 2000 |
| PHR Trading Ltd | Agriculture & fishing | 2018 |
| Phronesis Medical Ltd | Health & social care | 2022 |
| Phylonoe Ltd | Professional & scientific | 2022 |
| Physio Resolutions Ltd | Health & social care | 2022 |
| Physiobest Limited | Other services | 2014 |
| Physioworx Online Ltd | Health & social care | 2025 |
| Physique-Fit Ltd | Health & social care | 2021 |
| Phytype Ltd | Information & communication | 2021 |
| Phyu Holdings Ltd | Real estate | 2024 |
| PI Educational Assessment Ltd | Education | 2017 |
| Piano Recital Online Concert Services Limited | Professional & scientific | 2004 |
| Piccalilli Catering Limited | Hospitality | 2000 |
| Piccalilli Equity Ltd | Financial services | 2022 |
| Pichichi Ltd | Health & social care | 2024 |
| Pickersleigh Limited | Hospitality | 2019 |
| Pickled Frog Ltd | Hospitality | 2018 |
| Picnic Fayre Limited | Wholesale & retail | 1983 |
| Picture Perfect Moments Ltd | Extraterritorial | 2023 |
| Picturecraft of Holt Limited | Wholesale & retail | 2020 |
| Picturepath Ltd | Administrative & support | 2017 |
| Pictures of Walls Ltd | Arts & recreation | 2025 |
| Pier Consultancy Limited | Information & communication | 2017 |
| Pier Plain Ltd | Real estate | 2022 |
| Pier to Pier Limited | Professional & scientific | 2025 |
| Piercontent Limited | Professional & scientific | 2024 |
| Pieri Holdings Limited | Real estate | 2019 |
| PIG & Beaver Ltd | Real estate | 2024 |
| Pigeon Studio Limited | Information & communication | 2024 |
| Pigg Lane Management Limited | Real estate | 2021 |
| Pigg Lane Management Services Limited | Administrative & support | 2022 |
| Piggy POT Ltd | Real estate | 2024 |
| Pightle Homes Limited | Construction | 2023 |
| Piglet&Chestnut Limited | Wholesale & retail | 2022 |
| PIK Consulting Ltd | Wholesale & retail | 2017 |
| Pike Air Ltd | Energy | 2025 |
| Pike Design and Build Limited | Construction | 2020 |