| Property Consultancy Services Ltd | Professional & scientific | 2024 |
| Property Debt Collection Limited | Professional & scientific | 1993 |
| Property Development Group Limited | Construction | 2022 |
| Property Savvy Limited | Professional & scientific | 2024 |
| Propnorcon Limited | Real estate | 2021 |
| Proserv Facilities Management Limited | Real estate | 2022 |
| Prospect Park Developments Ltd | Real estate | 2021 |
| Prospects R Limited | Information & communication | 2015 |
| Protagonist Events Limited | Administrative & support | 2024 |
| Protego Mortgage Planning Limited | Financial services | 2019 |
| Proven Properties Limited | Real estate | 2024 |
| Provenance Digital Group Ltd | Administrative & support | 2021 |
| Provenance NFT Ltd | Administrative & support | 2021 |
| Providence Place Management Company Limited | Administrative & support | 2002 |
| Przemek Surma Ltd. | Transport & logistics | 2014 |
| PS Project Solutions Limited | Professional & scientific | 2020 |
| PSB Properties (Hertford) Limited | Real estate | 2005 |
| PSS Holdings Limited | Financial services | 2022 |
| PSS Management Group Limited | Professional & scientific | 2025 |
| Psycare Limited | Health & social care | 2001 |
| Psychological Intelligence Foundation C.I.C. | Education | 2012 |
| Psychological Intelligence Limited | Information & communication | 1999 |
| Psychological Services Monika GOS Ltd | Health & social care | 2023 |
| Ptolemy Capital Limited | Financial services | 2007 |
| Ptolemy Equestrian Limited | Agriculture & fishing | 2022 |
| Public Service Insight Ltd | Professional & scientific | 2019 |
| Pugilist Punks Limited | Wholesale & retail | 2023 |
| Pulselabs Ltd | Manufacturing | 2020 |
| Pumpkinbottom Ltd | Extraterritorial | 2019 |
| Pupps Ltd | Wholesale & retail | 2023 |
| Pure IT Support Ltd | Information & communication | 1998 |
| Putsi Productions Limited | Information & communication | 2025 |
| PVC Trading Limited | Wholesale & retail | 2012 |
| Q R S Market Research Limited | Professional & scientific | 1993 |
| Qaal Digital Health Limited | Information & communication | 2022 |
| QC Consultancy Ltd | Information & communication | 2026 |
| QMS Services Limited | Other services | 2004 |
| QT Nails and Beauty Ltd | Other services | 2020 |
| Quadra House (Basingstoke) Management Company Limited | Households | 2016 |
| Qualimill Engineering Limited | Professional & scientific | 2013 |
| Qualimill Limited | Professional & scientific | 2013 |
| Qualimill Products Limited | Manufacturing | 2007 |
| Qualiturn Products Limited | Manufacturing | 1974 |
| Quality LED Projects Ltd | Professional & scientific | 2023 |
| Quality Roofing Solutions Limited | Construction | 2009 |
| Quandium Limited | Administrative & support | 2021 |
| Quantum Noise UK Limited | Information & communication | 2001 |
| Quarterstone Holdings Limited | Real estate | 2026 |
| Quartus Properties LLP | | 2022 |
| Quayside Imports Limited | Wholesale & retail | 2019 |
| Queens Court (Hertford) Management Company Limited | Households | 1969 |
| Queens Court Sovereign Limited | Households | 2009 |
| Queensberry Boxing Limited | Extraterritorial | 2010 |
| Queensberry Commercial Ltd | Professional & scientific | 2018 |
| Queensberry Fight Network Limited | Arts & recreation | 2008 |
| Queensberry Promotions Limited | Arts & recreation | 2010 |
| Queensgate Enterprises Limited | Real estate | 2007 |
| Querencia Capital Limited | Professional & scientific | 2023 |
| Quest Group.World LLP | | 2015 |
| Quickboxtransport Limited | Transport & logistics | 2020 |
| Quillian Management Limited | Real estate | 2018 |
| R & M Properties (2022) Limited | Real estate | 2022 |
| R & R Garden Maintenance Limited | Administrative & support | 2026 |
| R & R Landscaping Limited | Administrative & support | 2026 |
| R a Neve & Company Limited | Construction | 1997 |
| R B Retail Trading Limited | Wholesale & retail | 2005 |
| R D H Home Improvements Ltd | Manufacturing | 2019 |
| R G Moody Ltd | Construction | 2018 |
| R L Electrix Limited | Construction | 2012 |
| R S Drainage Solutions Limited | Construction | 2025 |
| R&F Discounts Ltd | Wholesale & retail | 2019 |
| R&L Solutions Ltd | Construction | 2018 |
| R-Dub Management Ltd | Professional & scientific | 2019 |
| R.E. Property Limited | Real estate | 2020 |
| Race Motion Limited | Other services | 2024 |
| Radiaderm Ltd | Wholesale & retail | 2021 |
| Radial Creative Limited | Other services | 2016 |
| Radiant Edge Ltd | Professional & scientific | 2025 |
| Railx UK Ltd | Transport & logistics | 2014 |
| Rainbow Management Consultancy Services Limited | Professional & scientific | 2023 |
| RAJ Optical Services Ltd | Manufacturing | 2017 |
| Ralcom Consulting Ltd | Information & communication | 2018 |
| Rangeland Limited | Transport & logistics | 2023 |
| Ranger Property Management Ltd | Households | 2022 |
| RAW Natural Beef Ltd | Wholesale & retail | 2019 |
| Rayan Meze Grill Ltd | Hospitality | 2025 |
| Rayner Property Ltd | Real estate | 2023 |
| RBG Consultancy Services Ltd | Professional & scientific | 2022 |
| RBW Restructuring Limited | Professional & scientific | 2020 |
| Re-New Tools & Accessories Limited | Wholesale & retail | 2015 |
| Re-Play at Skyswood Limited | Other services | 2011 |
| Re:Play After School Club Limited | Other services | 2009 |
| Reachly Limited | Real estate | 2022 |
| React UK Property Services Limited | Construction | 2016 |
| Realign Restore Reformer Pilates Studio Limited | Health & social care | 2025 |
| Rebecca Smith Finance Ltd | Information & communication | 2015 |
| Rebekah Metson Ltd | Professional & scientific | 2017 |
| Recognition Group Limited | Financial services | 2021 |
| Recognition Holdings Limited | Financial services | 2020 |
| Recognition One X Limited | Administrative & support | 2021 |