| Prized Possessions Limited | Wholesale & retail | 1974 |
| Pro Chem Pressure Wahsing Ltd | Administrative & support | 2025 |
| Proactive Management (UK) Ltd | Financial services | 2010 |
| Prodev Software Limited | Information & communication | 2023 |
| Profit and Panache Ltd | Professional & scientific | 2018 |
| Project Squared Construction Limited | Construction | 2009 |
| Prolite Educational Support Services Limited | Professional & scientific | 2022 |
| Proper Realty Limited | Real estate | 2023 |
| Proper TEE Estates Ltd | Real estate | 2026 |
| Propertyspire Ltd | Real estate | 2018 |
| Prospect Place (Bushey) Management Company Limited | Households | 2008 |
| Proum Consultancy Ltd | Professional & scientific | 2012 |
| Psbss Limited | Health & social care | 2013 |
| Psukhe Ltd | Health & social care | 2024 |
| Puffs Point Ltd | Wholesale & retail | 2025 |
| Pure Engineers Limited | Mining & quarrying | 2024 |
| Pure Marketing & PR Ltd | Professional & scientific | 2012 |
| Purely Wedding Diaries Ltd | Professional & scientific | 2025 |
| Purple Fedora Limited | Administrative & support | 2019 |
| Purple Orchard Homes Limited | Real estate | 2020 |
| PVA Tech Limited | Information & communication | 2013 |
| Pva-Avp Ltd | Real estate | 2019 |
| Qippay Ltd | Information & communication | 2022 |
| Qoot BC1 UK Limited | Other services | 2017 |
| Qoot BC2 UK Limited | Other services | 2017 |
| Qoot BC4 UK Limited | Other services | 2018 |
| Quakers Walk Properties Ltd | Construction | 2025 |
| Quantumsentinel AI Limited | Information & communication | 2026 |
| Quasol Ltd | Information & communication | 2024 |
| Queens' School (Bushey) | Education | 2011 |
| Quick Volt Electric Ltd | Construction | 2026 |
| QUM Technologies Ltd | Information & communication | 2015 |
| Quoteo Ltd | Information & communication | 2026 |
| R & C Investments Group Limited | Wholesale & retail | 2023 |
| R & D Communication Services Ltd. | Information & communication | 1993 |
| R J Safe Motors Limited | Manufacturing | 2019 |
| R Trenton Limited | Arts & recreation | 2011 |
| R&R Badiani Ltd | Health & social care | 2023 |
| R.N. Shaw Limited | Real estate | 1975 |
| R2 Music Limited | Arts & recreation | 2024 |
| R2K Limited | Real estate | 2018 |
| Radar Services Ltd | Information & communication | 2022 |
| Radiance Health Ltd | Wholesale & retail | 2026 |
| Radiology Recipes Limited | Education | 2007 |
| Radius Resourcery Limited | Information & communication | 2003 |
| Radius Travels Ltd | Administrative & support | 2025 |
| Radreports Limited | Health & social care | 2016 |
| Rafts Limited | Information & communication | 2005 |
| RAI Developments Limited | Construction | 1997 |
| RAI Holdings Limited | Construction | 2000 |
| Raico Real Estate Limited | Real estate | 2016 |
| Rail Innovation & Consulting Limited | Information & communication | 2026 |
| Rail Signalling Solutions and Consultancy Limited | Professional & scientific | 2008 |
| Rainbow Residential Services Ltd | Health & social care | 2013 |
| RAJ Garden Restaurant Ltd | Hospitality | 2017 |
| Ramadimetja Madiba Limited | Health & social care | 2014 |
| Ramsoft Systems Ltd | Information & communication | 2015 |
| Rangkhola Limited | Real estate | 2024 |
| Ranmoor Land Limited | Construction | 2009 |
| Raoul's Limited | Hospitality | 1988 |
| Rapid Recruitment Ltd | Administrative & support | 2016 |
| Rapid Tire Solutions Ltd | Wholesale & retail | 2025 |
| Rapidco Investments Limited | Real estate | 2023 |
| Rapmark Products Limited | Real estate | 1941 |
| RAS Smiles Ltd | Health & social care | 2024 |
| Rathik Investments Limited | Real estate | 2020 |
| Rave Invaders Ltd | Wholesale & retail | 2025 |
| RAW Business Development Ltd | Wholesale & retail | 2015 |
| RAY Zone Limited | Wholesale & retail | 2019 |
| RC1 Construction Ltd | Construction | 2021 |
| Reassure IT Limited | Information & communication | 2014 |
| Reborn Recycling Ltd | Water & waste | 2015 |
| Rebos Investments Limited | Wholesale & retail | 2002 |
| Rebourne Health & Fitness Ltd | Arts & recreation | 2023 |
| Reci Builders Limited | Construction | 2013 |
| Recycle Your Cycle CIC | Other services | 2025 |
| Red House Bushey Freehold Ltd | Other services | 2020 |
| Red Lion (Bushey) Ltd | Hospitality | 2026 |
| Redcliff Energy Advisors Ltd | Professional & scientific | 2018 |
| Redhead Limited | Administrative & support | 2007 |
| Redwoods Consulting Ltd | Professional & scientific | 2015 |
| Refillabell UK Limited | Wholesale & retail | 2020 |
| Regulate Health Ltd | Information & communication | 2025 |
| Regulatory Excellence Consulting Ltd | Professional & scientific | 2024 |
| Rehman Property Investments Limited | Real estate | 2019 |
| Reilly Surveying Services Ltd | Professional & scientific | 2023 |
| Reis Hris Consulting Limited | Information & communication | 2016 |
| Rejuvene Luxe Ltd | Extraterritorial | 2025 |
| Relocated Properties Ltd | Real estate | 2012 |
| Remeton Limited | Information & communication | 2026 |
| Removal Approval Limited | Extraterritorial | 1999 |
| Removals Direct Limited | Extraterritorial | 2005 |
| Reporting Services Ltd | Information & communication | 2007 |
| Reptilepit Intl Ltd | Agriculture & fishing | 2012 |
| RES Training Limited | Administrative & support | 2018 |
| Restaurant One Solution Ltd | Information & communication | 2021 |
| Reuna AI Ltd | Information & communication | 2025 |
| Reveley Lodge Trust | Arts & recreation | 2003 |
| Revidae Ltd | Health & social care | 2025 |
| Revive Plumbing Services Limited | Construction | 2014 |