| Quercus Property Services Limited | Administrative & support | 2013 |
| Quercus South Limited | Professional & scientific | 2010 |
| Quest LAB Ltd | Information & communication | 2025 |
| Quin Medical Limited | Health & social care | 2019 |
| Quorthon Ltd | Information & communication | 2025 |
| Quorum 15 Limited | Administrative & support | 2005 |
| Qutis Herts Limited | Health & social care | 2017 |
| R & K Fire Alarms Limited | Financial services | 2006 |
| R & P Estates Limited | Real estate | 2016 |
| R Anderson Consulting Ltd | Professional & scientific | 2024 |
| R B Hospitality Ltd | Professional & scientific | 2022 |
| R B Novelties Limited | Hospitality | 2023 |
| R Burleigh Electrical Services Ltd | Construction | 2026 |
| R F Marketing Solutions Limited | Professional & scientific | 2013 |
| R Gibson Electrical Ltd | Construction | 2014 |
| R Gofton Construction Services Ltd | Professional & scientific | 2016 |
| R J Construction (Building Services) Limited | Construction | 2020 |
| R J Kent Building Services Ltd | Construction | 2009 |
| R Lawrence Farrier Services Ltd | Agriculture & fishing | 2021 |
| R Morjaria Medical Limited | Health & social care | 2014 |
| R Woodcraft Ltd | Manufacturing | 2019 |
| R&M Experts Limited | Real estate | 2023 |
| R.F.P. Morris Investments Limited | Professional & scientific | 2016 |
| R.J.P. Engineering Limited | Manufacturing | 1979 |
| R.P.Bayliss Groundwork Contractors Limited | Construction | 2020 |
| R.Stedman & Sons Limited | Construction | 1962 |
| Radglen Limited | Real estate | 1982 |
| Radiologic Ltd | Health & social care | 2019 |
| Radiology Teaching LAB Ltd | Health & social care | 2019 |
| Radix Properties Limited | Construction | 1953 |
| Radkid Ltd | Health & social care | 2022 |
| Rafcar Autos Ltd | Administrative & support | 2016 |
| Ragman Limited | Wholesale & retail | 2015 |
| Rail Specialists Ltd | Professional & scientific | 2015 |
| Railway Specialists Limited | Extraterritorial | 2022 |
| Railway Training Solutions Ltd | Construction | 2018 |
| Rain OR Shine Forest PRE School Limited | Health & social care | 2016 |
| Rainbow Farm Ltd | Real estate | 1971 |
| Rainbow Kidswear Ltd | Wholesale & retail | 2018 |
| Raiseyou Ltd | Education | 2025 |
| Rakesh Amin Endocrine Ltd | Health & social care | 2011 |
| Raltec LLP | | 2023 |
| Ramsden Accountancy Services Limited | Professional & scientific | 2023 |
| Rana & Associates Ltd | Real estate | 2025 |
| Range Employment Ltd | Administrative & support | 2019 |
| Raoj Ltd | Real estate | 2017 |
| Rapley Investments Ltd | Real estate | 2019 |
| Rasacare Ltd | Administrative & support | 2016 |
| Raters Group Ltd. | Information & communication | 2017 |
| Rather Marvellous Ltd | Information & communication | 2006 |
| Raula Investments Ltd | Real estate | 2016 |
| Ravensbourne House Limited | Real estate | 2017 |
| Ravensbourne Road Allotments Limited | Other services | 2020 |
| RAW Graphite Ltd | Hospitality | 2017 |
| Rayin Liquor Trading Ltd | Real estate | 2021 |
| Rayzon Properties Ltd | Real estate | 2026 |
| RB Hvac Services Ltd | Construction | 2023 |
| RBO Holdings Ltd | Financial services | 2026 |
| Rcflyingbootcamp Ltd | Education | 2023 |
| RCG Partners Ltd | Information & communication | 2012 |
| Rcgevolve Ltd | Professional & scientific | 2025 |
| Rcovr Ltd | Arts & recreation | 2025 |
| RCT Water Services Ltd | Administrative & support | 2010 |
| RDJ Sports Development Limited | Arts & recreation | 2012 |
| Rdrakepsychology Limited | Professional & scientific | 2022 |
| RDX Supplies Ltd | Wholesale & retail | 2015 |
| RDZ Services Ltd | Wholesale & retail | 2023 |
| Reach Industries Limited | Professional & scientific | 2019 |
| Read Arthur Associates Limited | Professional & scientific | 2015 |
| Reads Trading Limited | Administrative & support | 2000 |
| Ready Sorted Solutions Ltd | Information & communication | 2014 |
| Ready Steady Grow Allotments Limited | Arts & recreation | 2009 |
| Real IQ Limited | Information & communication | 2026 |
| Reality Inn Company Limited | Hospitality | 1997 |
| Reality Inn Trading Limited | Hospitality | 2015 |
| Really Investment Limited | Administrative & support | 2019 |
| Really Simple HR Solutions Ltd | Administrative & support | 2026 |
| REB8 Ltd | Professional & scientific | 2018 |
| REB8 Recycle Ltd | Manufacturing | 2019 |
| Rechner & Sons Limited | Health & social care | 2018 |
| Reconiq Limited | Professional & scientific | 2025 |
| Reconnect Business Coaching Ltd | Professional & scientific | 2019 |
| Recovery Medical Limited | Health & social care | 2021 |
| Recovery Restoration Ltd | Administrative & support | 2019 |
| Recreo Land and Regeneration Limited | Extraterritorial | 2020 |
| Rectory Properties Ltd | Real estate | 2024 |
| Red Apple AV Limited | Information & communication | 2011 |
| Red Bridge Advisory Limited | Administrative & support | 2021 |
| Red BUS Communications Ltd | Information & communication | 2021 |
| Red Coyote Ltd | Financial services | 2014 |
| Red Estate Services London Limited | Other services | 2014 |
| Red Felix Limited | Information & communication | 2009 |
| Red Fort Tandoori Restaurant Kent Limited | Hospitality | 2013 |
| Red Green Films Limited | Information & communication | 2011 |
| Red Hand Brand Ltd | Wholesale & retail | 2019 |
| Red House,Stepney(Incorporated)(The) | Hospitality | 1909 |
| Red Kite Building & Compliance Ltd | Construction | 2025 |
| Red Rock Compliance Limited | Extraterritorial | 2021 |
| Red Rock Corporation Limited | Real estate | 2020 |
| Red Team Gardens Ltd | Administrative & support | 2025 |