| Pump Services Hampshire Ltd | Extraterritorial | 2019 |
| Pump Services London Ltd | Extraterritorial | 2019 |
| Pump Services Surrey Ltd | Other services | 2016 |
| Pump Services Sussex Ltd | Extraterritorial | 2019 |
| Pumpyping Media Limited | Arts & recreation | 2023 |
| Pupnik Ltd | Wholesale & retail | 2015 |
| Puppets Magic Studio Ltd | Manufacturing | 2015 |
| Purbeck Nature Retreat Ltd | Hospitality | 2020 |
| Pure Botanica Ltd | Wholesale & retail | 2026 |
| Pure Dwelling Construction Ltd | Construction | 2019 |
| Pure Evil Pictures Limited | Arts & recreation | 2023 |
| Pure Fashion Limited | Wholesale & retail | 2019 |
| Pure Heating & Plumbing Solutions Ltd. | Construction | 2016 |
| Pure Hydration Limited | Manufacturing | 2025 |
| Pure Polymer Ltd | Wholesale & retail | 2019 |
| Pure Potential AM Ltd | Health & social care | 2014 |
| Purely Academic Ltd | Education | 2003 |
| Purple Jelly Ltd | Information & communication | 2007 |
| Purple Taxi Ltd | Transport & logistics | 2025 |
| PVD Capital Ltd | Financial services | 2023 |
| Q7 Integration Limited | Administrative & support | 2007 |
| Qalandar Express Ltd | Wholesale & retail | 2019 |
| Qkonnect UK Limited | Public administration | 2025 |
| Qsix UK Residential LLP | | 2020 |
| Quadrum Park Management Company Limited | Real estate | 2008 |
| Quality Car Finder Limited | Other services | 2019 |
| Quantay Ltd | Real estate | 2022 |
| Quantumly Limited | Information & communication | 2026 |
| Quarterhill Homes (GX) Limited | Construction | 2019 |
| Quarterhill Homes Limited | Construction | 2016 |
| Quasar Consulting Ltd | Information & communication | 2014 |
| Qubit Cloud Limited | Information & communication | 2022 |
| Qudosme Ltd | Information & communication | 2008 |
| Queen Anne's Gate Residents Association Limited | Households | 1999 |
| Queens Head Management Company Limited | Households | 2010 |
| Queensbrook Land Limited | Construction | 2026 |
| Queensbury Gardens (Ascot) Management Limited | Households | 2013 |
| Questrace Limited | Financial services | 2015 |
| Quick Reporting Ltd | Professional & scientific | 2016 |
| Quick-Flo Ltd | Water & waste | 2023 |
| Quinlan Tyley Limited | Real estate | 2021 |
| Quinn HQR Ltd | Professional & scientific | 2026 |
| Quinten Woods Limited | Construction | 2014 |
| Qujit Ltd | Wholesale & retail | 2017 |
| R & D Locations Ltd | Information & communication | 2018 |
| R & K Revive Ltd | Construction | 2023 |
| R J Johnson Developments Ltd | Construction | 2007 |
| R J Noon Properties Limited | Real estate | 2018 |
| R S Cane Scaffolding Ltd | Construction | 2018 |
| R S Purdey Investments Limited | Real estate | 2014 |
| R Talwar Compliance Ltd | Professional & scientific | 2023 |
| R&I Group Ltd | Construction | 2026 |
| R.J. Smith & Co. Ltd | Construction | 2018 |
| R.S. Aqua Holdings Limited | Financial services | 2014 |
| R.S. Aqua Limited | Manufacturing | 1982 |
| RAB AI Ltd | Professional & scientific | 2026 |
| Rabey Poley Enterprises Limited | Real estate | 2021 |
| Radical Strategy Limited | Professional & scientific | 2017 |
| Radio Days Retro Limited | Wholesale & retail | 2020 |
| Radley Corporation Limited | Information & communication | 2000 |
| Raeo Limited | Professional & scientific | 2025 |
| Raggett Rentals Limited | Real estate | 2016 |
| Railway Place Whitchurch Management Company Limited | Households | 2018 |
| Rainbow One Ltd | Real estate | 2019 |
| Rainbow Roar Ltd | Wholesale & retail | 2023 |
| Raindance Irrigation Limited | Construction | 2012 |
| Raine Garden Design Limited | Administrative & support | 2019 |
| Raine Property Ltd | Real estate | 2023 |
| Raiveon Limited | Information & communication | 2005 |
| RAK Heating & Electric Ltd | Construction | 2019 |
| Rake Joinery Limited | Manufacturing | 2011 |
| Raleigh Road Management Company Limited | Households | 2003 |
| RAM Mount UK Limited | Wholesale & retail | 2004 |
| Rametex Ltd | Wholesale & retail | 2019 |
| Randall's Monitoring Ltd | Administrative & support | 2007 |
| Randall's Political Services LLP | | 2018 |
| Rankin Demolition & Dismantling Limited | Administrative & support | 2016 |
| Rankin Demolition Ltd | Wholesale & retail | 1997 |
| Rapidlink Telekoms Limited | Information & communication | 2022 |
| Rapport Solutions Ltd | Professional & scientific | 2010 |
| Ratamacue Music Ltd | Information & communication | 2023 |
| Ratcliffe Motor Company Limited | Wholesale & retail | 2016 |
| Rateasubby Ltd | Information & communication | 2026 |
| Rati Ltd | Construction | 2023 |
| Raveam Limited | Real estate | 2022 |
| Ravelin Close Limited | Households | 1996 |
| Ravelin Consulting Limited | Professional & scientific | 2023 |
| RAW Element Ltd | Real estate | 2009 |
| Raw.Af Ltd | Manufacturing | 2022 |
| Rawleys Ridge Residents Association Limited | Professional & scientific | 2004 |
| RAY Watson Design Limited | Professional & scientific | 2008 |
| Razors Farm Management Limited | Households | 2018 |
| RBW Holdings Limited | Financial services | 2021 |
| RCA Consultants Limited | Professional & scientific | 2013 |
| Rcs.Rocks Ltd | Professional & scientific | 2023 |
| RDI: Retail Display Installations Ltd | Construction | 2019 |
| RDK (Consultancy) Limited | Other services | 2002 |
| RDS Financial Consultants Limited | Financial services | 1993 |
| RDS Stone Ltd | Construction | 2020 |
| Real Homes Projects Ltd | Real estate | 2023 |