| QQ Services Limited | Transport & logistics | 2019 |
| Quadz Enterprise Ltd | Health & social care | 2025 |
| Quadzed Ltd | Transport & logistics | 2019 |
| Qualification Support Services Ltd | Professional & scientific | 2026 |
| Quality Building Solutions Ltd. | Construction | 2014 |
| Quality Joinery Fitting Ltd | Construction | 2015 |
| Quality Windows Installs Ltd | Construction | 2025 |
| Quality Windows of Essex Ltd | Construction | 2024 |
| Qualitybox Limited | Information & communication | 2017 |
| Quantdecor Limited | Construction | 2007 |
| Quantum MAX Ltd | Information & communication | 2018 |
| Quantum State Limited | Construction | 2022 |
| Quantum Stratus Ltd | Information & communication | 2023 |
| Quantumsynth Limited | Wholesale & retail | 2023 |
| Quattro Property Co Ltd | Real estate | 2020 |
| Qubed Derivatives LLP | | 2009 |
| Qubitt Interiors Ltd | Construction | 2011 |
| Quebec Human Resources Ltd | Real estate | 2020 |
| Quest IT Consulting Limited | Information & communication | 2011 |
| Quest Music Services Ltd | Information & communication | 2021 |
| Quick Auto Services London Ltd | Wholesale & retail | 2021 |
| Quick Choice 26 Limited | Construction | 2018 |
| Quick Consultancy Ltd | Transport & logistics | 2018 |
| Quince Consult Ltd | Professional & scientific | 2023 |
| Qulia Enterprise Limited | Health & social care | 2014 |
| QWW Clean Ltd | Wholesale & retail | 2025 |
| R & a Speed Ltd | Transport & logistics | 2022 |
| R & a Ventures Ltd | Construction | 2019 |
| R & J Turner UK Ltd | Manufacturing | 2010 |
| R & L Pike Limited | Construction | 2023 |
| R & M Maintenance Services Limited | Administrative & support | 2008 |
| R & R Landscapes & Environmental Limited | Administrative & support | 2016 |
| R a Motor Repair Centre Limited | Wholesale & retail | 2025 |
| R Active Trans Limited | Transport & logistics | 2013 |
| R and M Carpentry Services Ltd | Construction | 2026 |
| R BAL Limited | Real estate | 2018 |
| R C Plaster Mouldings Limited | Construction | 2022 |
| R G Willing Transport Service Ltd | Transport & logistics | 2011 |
| R Johnson Project Services Limited | Construction | 2024 |
| R T P P Limited | Real estate | 2012 |
| R Whyte and Sons Limited | Other services | 2010 |
| R Z Electrical Controls Ltd | Construction | 2014 |
| R&B Products Limited | Wholesale & retail | 2026 |
| R&B RO Trans Ltd | Transport & logistics | 2026 |
| R&G Interiors Ltd | Construction | 2015 |
| R&G Partners Properties Ltd | Real estate | 2025 |
| R&M Glazing Ltd | Construction | 2018 |
| R&R Drylining Ltd | Construction | 2026 |
| R&U Spray Ltd | Construction | 2023 |
| R. Vernon Morris (Chadwell) Limited | Transport & logistics | 1954 |
| R.E.B. Laser Limited | Manufacturing | 2026 |
| R.G.R. Logistics (UK) Ltd | Transport & logistics | 2014 |
| R.S.S. Construction Limited | Construction | 2010 |
| R.T.Rate Limited | Wholesale & retail | 1955 |
| R.V. Morris Limited | Professional & scientific | 1993 |
| Raas Properties Ltd | Real estate | 2023 |
| Raas Service Ltd | Transport & logistics | 2026 |
| RAC Roofing Ltd | Construction | 2011 |
| Race Construction Ltd | Construction | 2019 |
| Race Realm Ltd | Arts & recreation | 2025 |
| Racheda and Siblings Limited | Health & social care | 2013 |
| Rachel a Walsh Limited | Administrative & support | 2024 |
| Ractrans Ltd | Transport & logistics | 2017 |
| Radasca Haulage Ltd | Wholesale & retail | 2022 |
| Radford Way Limited | Wholesale & retail | 2020 |
| Radiantlife Health & Beauty Ltd | Wholesale & retail | 2024 |
| Radson Services Ltd | Professional & scientific | 2014 |
| RAE Contracts Limited | Construction | 2013 |
| Raenort Consultancy Ltd | Wholesale & retail | 2019 |
| RAF Mechanical Ltd | Construction | 2025 |
| Rafal Iron Road Ltd | Transport & logistics | 2026 |
| Rahman Studio Limited | Wholesale & retail | 2025 |
| RAI Builders Ltd | Construction | 2021 |
| RAI Servicing Ltd | Wholesale & retail | 2024 |
| Raimis Motors Ltd | Wholesale & retail | 2023 |
| Rain OR Shine Home Help Essex Limited | Administrative & support | 2021 |
| Raine's Hair & Beauty Clinic Ltd | Other services | 2010 |
| Raines Tanning Rooms Ltd | Other services | 2010 |
| Rainham Aluminium Fabrications Ltd | Real estate | 2021 |
| Rainham Architectural Fabrications Commercial Ltd | Manufacturing | 2021 |
| Rainstone FX Limited | Financial services | 2026 |
| Raising Eagles Ltd | Health & social care | 2023 |
| RAJ Kitchen Grays Ltd | Hospitality | 2021 |
| Rajduth Tandoori Limited | Hospitality | 2020 |
| Ralh Services Ltd | Construction | 2023 |
| Rammak Ltd | Health & social care | 2024 |
| Range Rover Engine Specialist Ltd | Other services | 2026 |
| Range Rover Specialist Ltd | Wholesale & retail | 2022 |
| Ranson Holdings Ltd | Real estate | 2021 |
| Rapha Property Solutions Ltd | Real estate | 2008 |
| Rapha Solutions Limited | Information & communication | 2015 |
| Rapid Emergency Accommodation Ltd | Real estate | 2024 |
| Rapido Limited | Transport & logistics | 2019 |
| Rarda (2019) Limited | Administrative & support | 2019 |
| Raslan Commercial Ltd | Real estate | 2005 |
| Raslan Enterprise Ltd | Wholesale & retail | 2014 |
| Rates Fast Lane Limited | Extraterritorial | 2021 |
| Rates Service TEC Limited | Extraterritorial | 2018 |
| Ratesford Store Limited | Wholesale & retail | 2015 |
| RAY LEE Logistics Limited | Transport & logistics | 2017 |