| Property Investors Mediation Service Limited | Other services | 2022 |
| Property Networking Breakfasts Limited | Extraterritorial | 2009 |
| Property Touch Ltd | Real estate | 2017 |
| Property Tribes World Forum Ltd | Information & communication | 2026 |
| Prospera Solutions Ltd | Administrative & support | 2025 |
| Protectolite Limited | Financial services | 1998 |
| Protectworks Limited | Information & communication | 2008 |
| Provence Holidays Ltd | Hospitality | 2017 |
| Pruzan Ltd | Wholesale & retail | 2021 |
| Psbk Limited | Construction | 2020 |
| PSP Construction Ltd | Construction | 2016 |
| Psrs Holdings Limited | Real estate | 2025 |
| Psychotherapy.Art Ltd | Health & social care | 2021 |
| PTA Services Limited | Financial services | 2024 |
| Ptaconsult Limited | Extraterritorial | 2012 |
| Pumped Tomatoes Limited | Extraterritorial | 2024 |
| Punitzer Ltd | Financial services | 2019 |
| Pure Consolidation UK Ltd | Health & social care | 2022 |
| Pure Couture Limited | Other services | 2005 |
| Pure Elegance Dresses Ltd | Wholesale & retail | 2017 |
| Purity Brands Limited | Wholesale & retail | 2011 |
| Purple Daffodil Consulting Limited | Professional & scientific | 2024 |
| Purple Daffodil Limited | Wholesale & retail | 2023 |
| Purple Daisy Communications Ltd | Extraterritorial | 2020 |
| Purple Heather Consulting Ltd | Information & communication | 2017 |
| Purple YAM Productions LLP | | 2025 |
| Puvan Courtyard Limited | Real estate | 2023 |
| PWG Properties Ltd | Real estate | 2025 |
| Pwmc Limited | Professional & scientific | 2023 |
| Pyebush Investments Limited | Real estate | 2018 |
| Pyramid Healthcare Limited | Wholesale & retail | 2012 |
| Q Garden Maintenance Limited | Households | 2009 |
| Q Home and Garden Ltd | Administrative & support | 2025 |
| QDN2 Childcare Limited | Health & social care | 2023 |
| QHS Plumbing Limited | Construction | 2024 |
| QM Interiors Limited | Manufacturing | 2008 |
| Quackers Day Nursery Limited | Health & social care | 2011 |
| Quackers Nursery Limited | Health & social care | 2015 |
| Quality Couplings Limited | Manufacturing | 1965 |
| Quality Heating Services Limited | Construction | 1995 |
| Quality Pumps Limited | Wholesale & retail | 2001 |
| Quantum Reach Marketing Agency Ltd | Professional & scientific | 2024 |
| Quantum SIX Consulting Limited | Professional & scientific | 2019 |
| Quartet Business Services Group Limited | Professional & scientific | 2012 |
| Quarto Advisors Limited | Professional & scientific | 2009 |
| Quartz Finance Limited | Financial services | 2004 |
| Quattro Rose Limited | Real estate | 2025 |
| Qube Unlimited Ltd | Professional & scientific | 2021 |
| Qubedata (Holdings) Limited | Financial services | 2020 |
| Queen of the Fight Ltd | Wholesale & retail | 2024 |
| Quest Sales Limited | Wholesale & retail | 1998 |
| Quintech Motor Engineers Ltd | Wholesale & retail | 2018 |
| R BAL Properties Limited | Real estate | 2022 |
| R M D'Arcy Limited | Professional & scientific | 2021 |
| R&N Consultancy Limited | Professional & scientific | 2018 |
| R. & F. Developments | Arts & recreation | 1958 |
| R. M. Hillier Limited | Professional & scientific | 2002 |
| R.S. Baghri Limited | Wholesale & retail | 2008 |
| R.T. Sales Training Limited | | 1988 |
| R23SR Development Ltd | Construction | 2025 |
| R2V Windscreens Ltd | Construction | 2024 |
| R3 Traders Ltd | Real estate | 2017 |
| RAA Lewis Home Renovations Ltd | Construction | 2015 |
| RAA Studios Limited | Information & communication | 2020 |
| Rabbani Homes Ltd | Real estate | 2022 |
| Rachel Dempers Ltd | Professional & scientific | 2018 |
| Radhe Radhe Accountants Limited | Professional & scientific | 2024 |
| Radvan Ltd | Professional & scientific | 2026 |
| Raghava Solutions Ltd | Information & communication | 2018 |
| Rahman Consulting Limited | Information & communication | 2025 |
| Rahn (UK) Limited | Wholesale & retail | 1990 |
| Raid Supply Ltd | Wholesale & retail | 2023 |
| Rain Consulting Ltd | Professional & scientific | 2024 |
| Rainbows Nursery Limited | Health & social care | 2006 |
| Rampling Edgley Limited | Administrative & support | 2008 |
| Ramsey Park Consultancy Limited | Professional & scientific | 2019 |
| Rania Salon Ltd | Other services | 2023 |
| Ravensmoor (Pitstone) Management Co Ltd | Households | 2020 |
| Rayners Partnership LLP | | 2023 |
| RB Clear Waste Removal Limited | Water & waste | 2026 |
| RB3 Services Ltd | Wholesale & retail | 2024 |
| RCR Properties Limited | Real estate | 2013 |
| RDC Homes Limited | Real estate | 2016 |
| Reading Bedding Limited | Professional & scientific | 2007 |
| Ready Solutions Limited | Administrative & support | 1996 |
| Real Aluminium Products Limited | Manufacturing | 2024 |
| Realis Construction Limited | Construction | 2025 |
| Recliner Furniture Limited | Extraterritorial | 2011 |
| Recoveru Ltd | Manufacturing | 2018 |
| Red FOX Property Limited | Real estate | 2019 |
| Red Kite Kitchens Limited | Wholesale & retail | 2009 |
| Red Kite Rope Access Limited | Manufacturing | 2026 |
| Red Mobile Communications Limited | Information & communication | 2015 |
| Redfold Vineyards LLP | | 2010 |
| Redgarth Consulting Limited | Professional & scientific | 2021 |
| Redpoint Associates LLP | | 2013 |
| Redpoint HR Associates LLP | | 2022 |
| Redwood Glade Management Company Limited | Households | 2002 |
| Redwood MG Limited | Financial services | 2014 |
| Reeves & Reeves Consulting Ltd | Information & communication | 2020 |