| RAL Digital Labs Limited | Information & communication | 2025 |
| Ralphskoth Limited | Wholesale & retail | 2023 |
| RAM Consultants (Uk&I) Limited | Information & communication | 2025 |
| Ramol Group Limited | Wholesale & retail | 2025 |
| Rampstamp LDN Ltd | Arts & recreation | 2024 |
| Ramsden Associates Limited | Professional & scientific | 2023 |
| Ramsey Leisure Limited | Hospitality | 1987 |
| Ramtek Utilities Ltd | Information & communication | 2013 |
| RAN Disa Property Limited | Real estate | 2026 |
| Rana Management Limited | Construction | 2012 |
| Rana Shalluf Limited | Health & social care | 2024 |
| Ranexco Ltd | Information & communication | 2019 |
| Rangbhanu Ltd | Wholesale & retail | 2024 |
| Rank Implement Ltd | Information & communication | 2025 |
| Rankhouse Ltd | Information & communication | 2026 |
| Rankvault Limited | Information & communication | 2025 |
| RAO Retreat Ltd | Real estate | 2025 |
| Rapid Business Technology Ltd | Information & communication | 2004 |
| Rapid Fire Competitions Ltd | Administrative & support | 2025 |
| Rapid Interim Construction Solutions Ltd | Construction | 2018 |
| Raquel Bellastella International Ltd | Information & communication | 2020 |
| RAR Marketing Ltd | Information & communication | 2026 |
| Rare Kpop Ltd | Wholesale & retail | 2024 |
| Rarebear Digital Limited | Administrative & support | 2024 |
| RAS Drop Solutions Ltd | Wholesale & retail | 2024 |
| RAS Portfolio Hub Ltd | Real estate | 2025 |
| Raspberry Ltd | Information & communication | 2005 |
| Rated Paving Solutions Ltd | Construction | 2025 |
| Ratemyaccom Ltd | Information & communication | 2025 |
| Rather Good Limited | Administrative & support | 2011 |
| Rathour Taxation Limited | Professional & scientific | 2025 |
| Rathrock Ltd | Real estate | 2017 |
| Ratiovos Limited | Professional & scientific | 2026 |
| Rattan City Ltd | Wholesale & retail | 2020 |
| Rattlesden Farms Limited | Real estate | 1984 |
| Rave Officeflow UK Ltd | Information & communication | 2026 |
| Raven Business Parks Ltd. | Real estate | 2010 |
| Raven Insight Ltd | Information & communication | 2025 |
| Raven Property Management LLP | | 2010 |
| Ravenstech Limited | Wholesale & retail | 2025 |
| Ravenwood Group Limited | Financial services | 2020 |
| Ravenwood Packaging Limited | Wholesale & retail | 2004 |
| Rawshi Ltd | Professional & scientific | 2023 |
| Rawson Social Ltd | Information & communication | 2026 |
| Rayan Business Services Limited | Wholesale & retail | 2022 |
| Raydan Watkins Architects Ltd | Professional & scientific | 2011 |
| Raymaps Limited | Manufacturing | 2024 |
| Rayner Property Solutions Ltd | Administrative & support | 2025 |
| Raytech Productions Ltd | Information & communication | 2020 |
| Raza Moeed Trading Ltd | Wholesale & retail | 2026 |
| Razitfirm Ltd | Information & communication | 2025 |
| RB Estate and Garden Services Ltd | Administrative & support | 2023 |
| Rbpro Limited | Manufacturing | 2019 |
| RBT Creative Limited | Professional & scientific | 2022 |
| RC007 Logistics Ltd | Transport & logistics | 2023 |
| RCG Websites Ltd | Information & communication | 2022 |
| RD Counselling Ltd | Health & social care | 2021 |
| RDA Financial Accountants Limited | Professional & scientific | 2023 |
| RDB Digital Health Consultancy Limited | Information & communication | 2025 |
| Rdmn Limited | Information & communication | 2024 |
| RDP Project Management Limited | Administrative & support | 2016 |
| Rdqs Ltd | Administrative & support | 2023 |
| RDT Property Group Ltd | Real estate | 2025 |
| RE-013-013 Limited | Real estate | 2025 |
| Re-Age Ltd | Health & social care | 2023 |
| Re-Gauge Ltd | Construction | 2026 |
| React Services Group Ltd | Administrative & support | 2022 |
| Reaction Digital Limited | Information & communication | 2016 |
| Reactive Renewables Limited | Construction | 2022 |
| Readgraves Limited | Information & communication | 2021 |
| Reading Hongkongers CIC | Other services | 2022 |
| Reading Sewing BEE Limited | Manufacturing | 2023 |
| Readwin Barclay Ltd | Real estate | 2014 |
| Ready Gele Ltd | Wholesale & retail | 2022 |
| Readyntis Formatbase Ltd | Wholesale & retail | 2026 |
| Real Axis Interactive Ltd | Information & communication | 2025 |
| Real Groundworks Ltd | Construction | 2025 |
| Real Recognise Real London Ltd | Wholesale & retail | 2024 |
| Real Teams Coaching Limited | Professional & scientific | 2015 |
| Realign Therapy and Training Limited | Public administration | 2025 |
| Realitree Ltd | Information & communication | 2025 |
| Realizestate Ltd | Real estate | 2023 |
| Really Nice Stuff Ltd | Wholesale & retail | 2024 |
| Really Wild Biltong Company Ltd | Manufacturing | 2021 |
| Realtrade Limited | Information & communication | 2008 |
| Reascorsetcollection Limited | Wholesale & retail | 2023 |
| Reason Porsche Ltd | Wholesale & retail | 2019 |
| Reasonable Day Holdings Ltd | Financial services | 2022 |
| Reasonable Retailer Ltd | Wholesale & retail | 2023 |
| Reasonex Ltd | Information & communication | 2023 |
| Rebako Limited | Professional & scientific | 2019 |
| Rebel Connection Group Ltd | Professional & scientific | 2024 |
| Rebelrayz Inc Ltd | Arts & recreation | 2021 |
| Reberth Care Solutions Limited | Administrative & support | 2023 |
| Rebo Enterprises Ltd | Financial services | 2023 |
| Rebo Properties Ltd | Real estate | 2024 |
| Reboot and Rise UP Ltd | Health & social care | 2025 |
| Rebounce Ltd | Education | 2018 |
| Rebound Gymnastics Club Ltd | Education | 2018 |
| Recirculate Systems Limited | Information & communication | 2021 |