| PSS Residential Limited | Construction | 2022 |
| Pssj Property Limited | Real estate | 2020 |
| PSV Hair Limited | Other services | 2008 |
| Psychometricks Limited | Education | 2025 |
| PT Building & Carpentry Ltd | Construction | 2022 |
| PT Building Services Ltd | Construction | 2026 |
| Ptolomy Finance Limited | Professional & scientific | 2012 |
| Pudfield Investments Ltd | Administrative & support | 1983 |
| Pukstar Ltd | Information & communication | 2022 |
| Pulse Global Events Ltd | Administrative & support | 2025 |
| Puneet Ltd | Information & communication | 2021 |
| Pura Tails UK Limited | Other services | 2025 |
| Puran Chand Shori Limited | Real estate | 2016 |
| Purdyperformance Ltd | Arts & recreation | 2026 |
| Pure Concept Limited | Information & communication | 2005 |
| Pure Ocean Technologies Ltd | Information & communication | 2010 |
| Purepath Trading Ltd | Wholesale & retail | 2025 |
| Purepath Vantures Ltd | Information & communication | 2026 |
| Purlusso Consulting Limited | Professional & scientific | 2022 |
| Purple Laude Ltd | Real estate | 2017 |
| Purple Mangrove Ltd | Information & communication | 2026 |
| Purple Zebra Promotions Ltd | Other services | 2020 |
| Purva Investments Ltd | Real estate | 2023 |
| Purva Trading Ltd | Wholesale & retail | 2015 |
| Push Cloud Service Ltd | Information & communication | 2025 |
| Putt Fusion Limited | Wholesale & retail | 2024 |
| PVR Property Solutions Limited | Real estate | 2024 |
| Pyramid Wellness Studio Limited | Health & social care | 2025 |
| PZ Meer Properties Limited | Financial services | 2023 |
| Q Consultancy Services Limited | Real estate | 2024 |
| Q4 Recruitment Consultancy Limited | Administrative & support | 2002 |
| Qkhb Properties Ltd | Real estate | 2019 |
| Quadrant Cloud Limited | Information & communication | 2020 |
| Quantitation Ltd | Professional & scientific | 2018 |
| Quantum Value Information Technology Services Limited | Information & communication | 2011 |
| Qube Leasehold Property Management Limited | Real estate | 2006 |
| Qudos Estates Ltd | Real estate | 2011 |
| Queens Head (Pinner) Limited | Hospitality | 2026 |
| Questpark Limited | Wholesale & retail | 2008 |
| Quickhaven Limited | Wholesale & retail | 1988 |
| Quicksand Flooring Limited | Construction | 2010 |
| Quiet Fortitude Limited | Other services | 2025 |
| Quinn Developments (Midlands) Ltd | Real estate | 2013 |
| Quinn Green Limited | Professional & scientific | 2017 |
| Quintet Management Company Limited | Households | 1982 |
| Quirang Limited | Extraterritorial | 2022 |
| Quivira (Bushey) Ltd | Real estate | 2015 |
| Quivira (Watford) Ltd | Real estate | 2015 |
| Qworld Energy Ltd | Wholesale & retail | 2021 |
| R & R Smile Limited | Health & social care | 2014 |
| R &H Partners Limited | Hospitality | 2025 |
| R Holdings Group Ltd | Real estate | 2022 |
| R Hurd Limited | Transport & logistics | 2014 |
| R Muralee Properties Ltd | Real estate | 2021 |
| R&M Varsani Consultancy Ltd | Financial services | 2016 |
| R&S Medical Ltd | Health & social care | 2021 |
| R-Net Computers Limited | Information & communication | 2012 |
| R. Smith Services Limited | Transport & logistics | 2005 |
| R.A.H. Limited | Real estate | 2002 |
| R.D. Richards & Company (Maidenhead) Limited | Construction | 1974 |
| R.Kang Refurbishment Ltd | Construction | 2024 |
| R.N Home Maintenance Limited | Construction | 2026 |
| R4P LLP | | 2006 |
| RA Consulting Solutions Limited | Information & communication | 2022 |
| Raam Healthcare Limited | Health & social care | 2015 |
| Raap Global Limited | Professional & scientific | 2025 |
| Racedrive Residents Association Limited | Households | 1984 |
| Radeea M Services Ltd | Construction | 2014 |
| Radha Investments & Property Limited | Administrative & support | 2025 |
| Radha Investments Limited | Administrative & support | 2009 |
| Radian Consultancy Services Limited | Information & communication | 2022 |
| Radiance by Anushka Ltd | Health & social care | 2025 |
| Radiance Investments Limited | Real estate | 2022 |
| Radiant Web Limited | Information & communication | 2013 |
| Radiomaiden Ltd | Health & social care | 2019 |
| Radius Surgical Ltd | Health & social care | 2026 |
| Radon Properties Ltd | Real estate | 2019 |
| Radpeek Limited | Real estate | 2016 |
| Rae-Jay Investments Ltd | Arts & recreation | 2013 |
| Rafif Trade Limited | Construction | 2016 |
| Rafros Ltd | Real estate | 2017 |
| Rahilly Developments Limited | Extraterritorial | 1989 |
| Rahilly Plant Ltd | Construction | 2009 |
| RAI Management Limited | Real estate | 2017 |
| Raichura Dermacare Ltd | Health & social care | 2013 |
| Raicom Limited | Real estate | 2025 |
| Railpoint (UK) Limited | Information & communication | 2014 |
| Rainbow Leaves Ltd | Professional & scientific | 2017 |
| Rainfox Ltd | Wholesale & retail | 2024 |
| Rajini Murugan Ltd | Hospitality | 2017 |
| Rajj Investments Limited | Real estate | 2022 |
| Rajneha Ltd | Real estate | 2023 |
| Rajshree Limited | Real estate | 2021 |
| Rakam Trading Limited | Construction | 2022 |
| RAM Krishna Computer Services Limited | Information & communication | 1997 |
| RAM S Global Limited | Wholesale & retail | 2014 |
| Rama Pharma Limited | Wholesale & retail | 2018 |
| Rama Ventures Limited | Other services | 2024 |
| Ramchurn Estates Ltd | Real estate | 2025 |
| Ramchurn Properties LLP | | 2024 |