| Pwre Limited | Administrative & support | 2009 |
| Pyke Biggs Fairfax (Brighton) Limited | Wholesale & retail | 1985 |
| Q.Hill (EA 2) Management Company Limited | Households | 2007 |
| Qasim & Ashraf Limited | Professional & scientific | 2013 |
| Quad Southern Limited | Construction | 2009 |
| Quadrant Mechanical & Electrical Services Ltd | Construction | 2018 |
| Quality Risk Management Limited | Education | 2019 |
| Quantic Vision Ltd | Information & communication | 2019 |
| Quantum Mechanical Solutions Ltd | Manufacturing | 2024 |
| Quartz (Berryfields Aylesbury) Management Company Limited | Households | 2014 |
| Quartz House (Ebbsfleet) Management Company Limited | Households | 2025 |
| Queen Anne Street Medical Centre Limited | Professional & scientific | 2003 |
| Queens Court Residents Company Limited | Households | 2000 |
| Queensbury Gate Management Company Limited | Households | 2004 |
| Quotient Bioresearch (Radiochemicals) Limited | Professional & scientific | 2009 |
| R & a Building London Limited | Construction | 2018 |
| R & G Communications Limited | Information & communication | 1999 |
| R & R Stores Ltd | Wholesale & retail | 2023 |
| R & RG Media Ltd | Information & communication | 2017 |
| R S Trans Ltd | Transport & logistics | 2018 |
| R&G Salads Limited | Agriculture & fishing | 2022 |
| R.H. Data Ltd | Real estate | 2013 |
| R.P. Panels Limited | Wholesale & retail | 1980 |
| R.S.Porter(Contractors)Limited | Real estate | 1957 |
| R3D Ltd | Professional & scientific | 2025 |
| Radbourne Heights (Great Totham) Management Company Limited | Households | 2005 |
| Radiance Films Ltd | Other services | 2022 |
| Radical & Noble Ltd | Wholesale & retail | 2020 |
| Raffles Grill Limited | Hospitality | 2024 |
| Rainsborough Court (Hertford) Management Company Limited | Households | 2001 |
| Raleo Express Ltd | Information & communication | 2024 |
| Ramona Accountancy Ltd | Professional & scientific | 2018 |
| Ramona Rayson Investments Limited | Real estate | 2026 |
| Rare Groove UK Ltd | Arts & recreation | 2018 |
| Rastelli's Productions Limited | Arts & recreation | 2017 |
| Ravensbourne Gate (Gidea Park) Management Company Limited | Households | 2004 |
| RAW PT Gym Ltd | Arts & recreation | 2021 |
| RAY Delaney Advertising Ltd | Professional & scientific | 2019 |
| Rayson & Associates Ltd | Financial services | 2018 |
| Raztak Logistics Limited | Transport & logistics | 2012 |
| RBP Phase 2 Residents Management Company Limited | Households | 2026 |
| RCA Scaffolding Ltd | Construction | 2022 |
| RD Lifts Ltd | Construction | 2023 |
| RD Park (Hoddesdon Phase 2-K Units) Management Company Limited | Real estate | 2007 |
| RDP Inc Ltd | Other services | 2023 |
| Real Words Limited | Arts & recreation | 2026 |
| Recoil Springs Holdings Limited | Financial services | 2017 |
| Recoil Springs International Limited | Manufacturing | 1996 |
| Red Dog Sales and Marketing Ltd | Other services | 2025 |
| Red House Car Sales Ltd | Wholesale & retail | 2014 |
| Red Lion Court (Hatfield) Management Company Limited | Households | 2007 |
| Red Papaya Consulting Ltd | Information & communication | 2012 |
| Red Sky 2015 Ltd | Other services | 2015 |
| Red Sphere Home Ltd | Professional & scientific | 2012 |
| Red Wheel 76 Ltd | Transport & logistics | 2019 |
| Redrock Cleaning Services Ltd | Administrative & support | 2023 |
| Redrock Recruitment (Essex) Ltd | Construction | 2023 |
| Redrock Recruitment Ltd | Administrative & support | 2012 |
| Redrow@Cityfields Management Company Limited | Households | 2018 |
| Redvale Axis Ltd | Wholesale & retail | 2026 |
| Redwood Court (South Oxhey) Management Company Limited | Households | 1984 |
| Reece's Accountancy Services Limited | Professional & scientific | 2001 |
| Regal Court NO. 2 Limited | Households | 2000 |
| Regal Network Solutions Limited | Construction | 2025 |
| Regency Court (Parkgate) Residents Association Limited | Households | 2000 |
| Regency Court (Watford) Limited | Households | 2003 |
| Regency Mews Limited | Extraterritorial | 2014 |
| Regency Park (Telford) Management Company Limited | Households | 2002 |
| Regency Place (Loudwater) Management Company Limited | Households | 2005 |
| Regents Gate Phase 2 Management Company Limited | Households | 2004 |
| Reggie Productions Limited | Information & communication | 2023 |
| Reghi Limited | Construction | 2024 |
| Remlak Links Ltd | Health & social care | 2020 |
| Remtech Electrical Services Limited | Construction | 2015 |
| Reside Services Ltd | Administrative & support | 2023 |
| Residence Mortgages & Financial Services Limited | Administrative & support | 2007 |
| Residential Management Group Limited | Real estate | 1980 |
| Residential Management Property Limited | Professional & scientific | 1991 |
| Resna Capital Ltd | Professional & scientific | 2026 |
| Resolve Recruitment Limited | Administrative & support | 2018 |
| Respiratory Clinical Trials Limited | Professional & scientific | 2000 |
| Revelplan Limited | Hospitality | 1990 |
| Rewear Limited | Wholesale & retail | 2019 |
| Rexhaj Group Ltd | Construction | 2024 |
| RFM Ltd | Transport & logistics | 2025 |
| RG Private Ltd | Wholesale & retail | 2023 |
| RH Online Consulting Limited | Information & communication | 2020 |
| RHL Sports Ltd | Manufacturing | 2020 |
| Rich Solutions Group Ltd | Health & social care | 2015 |
| Richard Kemp Car Repairs Limited | Wholesale & retail | 2006 |
| Richard Percy Hoddesdon Limited | Professional & scientific | 2010 |
| Richard Stewart Williams Limited | Wholesale & retail | 1977 |
| Richmond Park (Whitfield) Residents Management Company Limited | Households | 2020 |
| Richmond Place Two (Chadwell Heath) Management Company Limited | Households | 2003 |
| Ricondi Investments Ltd | Real estate | 2013 |
| Ridgeways Properties Limited | Real estate | 2018 |
| Rigs Empire Ltd | Wholesale & retail | 2023 |
| Risborough Management Company Limited | Real estate | 1999 |
| Rise UN Limited | Administrative & support | 2024 |
| Riseside Residents Association Limited | Households | 1983 |