| Peryton Technologies Limited | Information & communication | 2018 |
| Peter Harris International Limited | Wholesale & retail | 1985 |
| Petersonsims Ltd | Professional & scientific | 1991 |
| Petrovi & Sons Ltd | Wholesale & retail | 2021 |
| PH Medical Communications Ltd | Information & communication | 2018 |
| Phillips Electrical (Commercial) Ltd | Manufacturing | 2013 |
| Phlexshop Ltd | Professional & scientific | 2010 |
| Phoenix Park Management 1994 Limited | Households | 1994 |
| Phul Ltd | Health & social care | 2013 |
| Physical Agency Ltd | Professional & scientific | 2026 |
| Picz Online Ltd | Wholesale & retail | 2021 |
| Pink Lady Logistics Ltd | Transport & logistics | 2022 |
| Pinnacle Real Solutions Ltd | Administrative & support | 2007 |
| Pinnacle Spray Renders Limited | Construction | 1995 |
| Piotr Karpinski Psychotherapy Ltd | Health & social care | 2017 |
| PIX Brook Court Management Company Limited | Households | 2008 |
| Pixelution Limited | Information & communication | 1990 |
| Plasmech Packaging Limited | Manufacturing | 1997 |
| Play IT Cool Solutions Ltd | Information & communication | 2018 |
| Playdisplaycafe Ltd | Wholesale & retail | 2026 |
| Player 2 Brand & Marketing Limited | Administrative & support | 2024 |
| Plot Keepers Limited | Agriculture & fishing | 2023 |
| Pock Limited | Extraterritorial | 2014 |
| POD Talent Limited | Administrative & support | 2012 |
| Poland Street LLP | | 2024 |
| Poles Apart Limited | Professional & scientific | 2005 |
| Polo Painters & Protective Coatings Ltd | Construction | 2021 |
| Polyprep Research and Applications Limited | Professional & scientific | 2000 |
| Pomelo Studio Limited | Arts & recreation | 2020 |
| Potton Investments Ltd | Real estate | 2023 |
| Ppnc Ltd | Wholesale & retail | 2024 |
| Pqube Limited | Information & communication | 2009 |
| PR Ninja Ltd | Information & communication | 2025 |
| Preceptass Limited | Professional & scientific | 2005 |
| Prefer 2 Trade Ltd | Wholesale & retail | 2015 |
| Prelovedbywillow Ltd | Wholesale & retail | 2026 |
| Prestige Interior Cleaning Ltd | Administrative & support | 2024 |
| Previewme Ltd | Information & communication | 2021 |
| Primeprom Ltd | Information & communication | 2025 |
| Printed Easy Limited | Manufacturing | 1976 |
| Prism Protection Limited | Administrative & support | 2003 |
| Priyamvadha IT Consultancy Ltd | Information & communication | 2018 |
| Pro Academy Tournaments Limited | Arts & recreation | 2019 |
| Pro HPT Ltd | Construction | 2019 |
| Procast Engineering Limited | Other services | 1989 |
| Procleanexpert Ltd | Administrative & support | 2019 |
| Professional Flight Simulator Ltd | Professional & scientific | 2024 |
| Prop IQ Limited | Real estate | 2019 |
| Propeller Studios (Holdings) Limited | Financial services | 2020 |
| Propeller Studios Limited | Administrative & support | 2001 |
| Provero Management Limited | Professional & scientific | 2018 |
| Provisio Holdings Limited | Financial services | 2019 |
| Provisio Limited | Financial services | 1994 |
| Pryor Court Residents Limited | Households | 2004 |
| Purecleaning F&A Ltd | Administrative & support | 2025 |
| Puretherm Energy Solutions Ltd | Professional & scientific | 2025 |
| Puritas Group Ltd | Administrative & support | 2025 |
| Purple Diamond Properties Ltd | Real estate | 2023 |
| Q Core Ltd | Administrative & support | 2014 |
| Q-Ed Innovations Limited | Administrative & support | 2023 |
| QCL Consulting Ltd | Information & communication | 2017 |
| Quantivo Ltd | Information & communication | 2025 |
| Qubit Logic Limited | Information & communication | 2026 |
| Quinx Vehicle & Farm Plant Management Limited | Administrative & support | 1995 |
| Quotidian Hitchin Ltd | Wholesale & retail | 2025 |
| R & P Bloss Builders Limited | Construction | 2007 |
| R & R Global EST Ltd | Real estate | 2025 |
| R Enterprise Solutions Ltd | Transport & logistics | 2019 |
| R H Mendel Ltd | Arts & recreation | 2019 |
| R J Pinnock & Sons Limited | Construction | 2004 |
| R Wedding Cars Ltd | Transport & logistics | 2016 |
| R&R Cleaning Solutions Ltd | Administrative & support | 2020 |
| Race Timing Solutions Limited | Manufacturing | 2013 |
| Rachel Rose Holdings Ltd | Financial services | 2025 |
| RAD Oncology Services Limited | Health & social care | 2026 |
| Radical EYE Ltd | Professional & scientific | 2022 |
| Rail Utility Vehicles Ltd | Manufacturing | 2025 |
| Railsense Solutions Ltd | Transport & logistics | 2021 |
| Railton Law Limited | Professional & scientific | 2022 |
| Rainbow Engineering Services Limited | Manufacturing | 2010 |
| Ralvale Limited | Real estate | 1984 |
| Randall Thomas Associates Limited | Information & communication | 2017 |
| Rapid Charge Anywhere Limited | Wholesale & retail | 2022 |
| Rapture Interactive Limited | Information & communication | 2008 |
| Rare Ware Co. Ltd | Information & communication | 2018 |
| RB Life Coaching Ltd | Professional & scientific | 2020 |
| RB Testing Limited | Information & communication | 2011 |
| Rbdb Limited | Construction | 2023 |
| RCM Interactive Limited | Information & communication | 2016 |
| RCP Talent Limited | Financial services | 2021 |
| RE3 Formation Ltd | Hospitality | 2022 |
| Re:Connect Yoga CIC | Other services | 2020 |
| Re:Connectology Ltd | Health & social care | 2024 |
| Reads Court Limited | Hospitality | 2018 |
| Real Risk Solutions Limited | Professional & scientific | 2026 |
| Rebelfit Limited | Arts & recreation | 2015 |
| Recruitment Accountants Ltd | Professional & scientific | 2024 |
| Recruitmentagenthub Ltd | Information & communication | 2026 |
| Rectory Mill Limited | Extraterritorial | 2014 |
| Red Contractors Ltd | Construction | 2022 |