| Pushkin Home & Interior Ltd | Real estate | 2020 |
| Putney Petals Limited | Wholesale & retail | 2016 |
| Puzzle Property Ltd | Construction | 2024 |
| PV Global Ltd | Professional & scientific | 2025 |
| PV01 Financial Limited | Professional & scientific | 2004 |
| PVL Limited | Extraterritorial | 1999 |
| PWM Driving Ltd | Education | 2023 |
| PWO Property Ltd | Real estate | 2018 |
| PYE Search Ltd | Information & communication | 2025 |
| Pyxis Property Consulting Limited | Administrative & support | 2015 |
| Q Mahmood Ltd | Information & communication | 2024 |
| Q-Oded Ltd | Professional & scientific | 2019 |
| QC Medicolegal Ltd | Professional & scientific | 2025 |
| Qebs Ltd | Professional & scientific | 2023 |
| QED Tax Consulting LLP | | 2005 |
| QF Research Ltd | Information & communication | 2016 |
| Qimiq UK Limited | Wholesale & retail | 2001 |
| Quadrant Building Services Limited | Construction | 2013 |
| Quality People Ltd | Administrative & support | 2019 |
| Quantec Contracting Limited | Construction | 1997 |
| Quantum Insight Consulting Limited | Administrative & support | 2016 |
| Quantum Wealth Planning Ltd | Financial services | 2015 |
| Quarry RD Management Co Ltd | Real estate | 2022 |
| Quaternion Systems Ltd | Information & communication | 2024 |
| Qudos Logic Ltd | Information & communication | 2014 |
| Quentin Jones Construction Ltd | Construction | 2014 |
| Quercus Training Ltd | Professional & scientific | 2014 |
| Quercus Wines Ltd | Wholesale & retail | 2018 |
| Quick Transfers Ltd | Administrative & support | 2011 |
| Quickfix UK Ltd | Wholesale & retail | 2000 |
| Quiet Solutions Limited | Construction | 2023 |
| Quinn and Sons Ltd | Real estate | 2011 |
| Quintilus Consulting Limited | Professional & scientific | 2017 |
| Qwerty Copywriting Limited | Information & communication | 2015 |
| Qwerty Enterprises Ltd | Information & communication | 2023 |
| R & a Wood LLP | | 2012 |
| R & J Ledger Limited | Agriculture & fishing | 2024 |
| R & K Commercial Solutions Limited | Construction | 2015 |
| R & S (Kent) Limited | Health & social care | 2021 |
| R Harfoot Consulting Limited | Professional & scientific | 2016 |
| R Hollands & Company LLP | | 2017 |
| R M Builders & Sons Limited | Construction | 2009 |
| R MCM Marketing & Brand Strategy Limited | Professional & scientific | 2012 |
| R W Invest London Limited | Other services | 2018 |
| R&F 2020 Limited | Financial services | 2020 |
| R&H Decorators (South East) Limited | Construction | 2017 |
| R-Core Limited | Construction | 2022 |
| R-Think Software Ltd | Information & communication | 2013 |
| R. Express (TW) Limited | Hospitality | 2019 |
| R.J.Q. Packaging Limited | Administrative & support | 2001 |
| R.T.A. Joinery Limited | Manufacturing | 1980 |
| R2 Integrate Ltd | Information & communication | 2024 |
| R3R Limited | Construction | 2007 |
| Raaz Services Ltd | Transport & logistics | 2023 |
| RAB Clinics Limited | Health & social care | 2023 |
| Rachel Oriel Ltd. | Hospitality | 2014 |
| RAD Fire Holdings Ltd | Financial services | 2026 |
| Radbid Limited | Professional & scientific | 2018 |
| Radcliffe & Sales Legacy Ltd | Arts & recreation | 2026 |
| Radioactive Toy Ltd | Information & communication | 2020 |
| Radmark Limited | Real estate | 1980 |
| Radstone Projects Holdings Limited | Financial services | 2023 |
| Radstone Projects Trading LLP | | 2023 |
| Radstone Property Investments Ltd | Real estate | 2024 |
| Raevin Group Limited | Professional & scientific | 2024 |
| Raford House RTM Company Ltd | Households | 2015 |
| Raga Ltd | Health & social care | 2025 |
| Rags Land & Property Ltd | Real estate | 2024 |
| Raid 5 Limited | Information & communication | 1998 |
| Raikila Consulting Limited | Information & communication | 2026 |
| Rainbase Ltd | Wholesale & retail | 2025 |
| Rainbow Quay Residents Company Limited | Households | 1996 |
| Raisa Barbers Ltd | Other services | 2022 |
| Raise Platform Ltd | Information & communication | 2021 |
| Raise UP Group Ltd | Financial services | 2021 |
| Raisepay Ltd | Administrative & support | 2023 |
| Raisin JAM Ltd | Information & communication | 2022 |
| RAJ Enterprises (3D) Ltd. | Manufacturing | 2013 |
| RAJ Enterprises (Properties) Limited | Real estate | 2002 |
| RAJ Pavilion Catering Limited | Hospitality | 2021 |
| Rajm Consulting Limited | Professional & scientific | 2020 |
| Rallis Roses Limited | Wholesale & retail | 2024 |
| RAM Alpine Management Company Limited | Real estate | 2015 |
| RAM Branding Trade Printers Ltd | Manufacturing | 2021 |
| RAM European Hotels (a) Limited | Real estate | 2015 |
| RAM European Hotels (S) Limited | Real estate | 2015 |
| RAM JV LLP | | 2009 |
| Ramcam Ltd | Information & communication | 2019 |
| Ramm Enterprises Limited | Administrative & support | 2014 |
| Ramona Graphics Ltd | Information & communication | 2024 |
| Ramp Regulatory Limited | Professional & scientific | 2023 |
| Ranak PVT Limited | Professional & scientific | 2023 |
| Randall and Valentine Residential Limited | Real estate | 2021 |
| Randolph and Mortimer Property Partners Ltd | Construction | 2022 |
| Random Feature Ltd | Professional & scientific | 2014 |
| Rankfresh Limited | Professional & scientific | 2020 |
| Rapid Response Staffing Solutions Ltd | Administrative & support | 2026 |
| Rapstone Limited | Households | 1987 |
| Rare Traits Ltd | Professional & scientific | 2023 |
| Rasselas Projects Limited | Professional & scientific | 2014 |