| RBS Plant & Commercial Limited | Administrative & support | 2006 |
| RC Property Ltd | Construction | 2022 |
| RC Woodcock Hill Limited | Hospitality | 2024 |
| RD Stagehand Services Limited | Information & communication | 2018 |
| RDA Distributions Ltd | Wholesale & retail | 2026 |
| RDJ Ultimate Interiors Ltd | Construction | 2015 |
| RDS Capital Family Office Limited | Professional & scientific | 2007 |
| Reach Management and Enterprises Ltd | Administrative & support | 2017 |
| Ready Money Capital Limited | Financial services | 2018 |
| Ready Steady Talk Ltd | Professional & scientific | 2019 |
| Real Eyes (Harrow) Limited | Health & social care | 2016 |
| Real Eyes (Slough) Limited | Other services | 2016 |
| Real Eyes (Wembley) Limited | Other services | 2016 |
| Real Eyes (Whitton) Limited | Other services | 2016 |
| Real Talent Management Ltd | Manufacturing | 2022 |
| Realeyes Limited | Wholesale & retail | 2003 |
| Realmeta Limited | Real estate | 2022 |
| Realserve Ltd | Information & communication | 2010 |
| Ream Group Limited | Financial services | 2026 |
| Rebos Advertising Limited | Real estate | 2022 |
| Rebos Property Limited | Real estate | 2023 |
| Rebos Restaurant Boston Limited | Hospitality | 2026 |
| Rebourne Health & Recovery Ltd | Arts & recreation | 2025 |
| Recovery & Transport Services Ltd | Transport & logistics | 2022 |
| Recovery Equipment Direct Limited | Wholesale & retail | 1999 |
| Recovery Web Solutions Limited | Professional & scientific | 2011 |
| Recsoon Limited | Wholesale & retail | 2018 |
| Recursive Property Limited | Real estate | 2021 |
| Recycling Non-Refill Ltd | Water & waste | 2022 |
| Red & Black Transport Ltd | Transport & logistics | 2025 |
| Red and Green Gardens Limited | Other services | 2021 |
| Red Brick Marketing Unlimited | Administrative & support | 2012 |
| Red Racing Ltd | Arts & recreation | 2021 |
| Reda Homes Limited | Construction | 2023 |
| Redcar Scaffolding Specialists Ltd | Construction | 2012 |
| Redesign Group Holdings Ltd | Financial services | 2025 |
| Redesign Group International Ltd | Professional & scientific | 2025 |
| Redington Capital Holdings Limited | Real estate | 2016 |
| Redington Capital Limited | Construction | 2013 |
| Redington Developments (Alperton) Limited | Construction | 2018 |
| Redington Developments (Athlon Road) Limited | Construction | 2018 |
| Redington Developments (Brentford) Limited | Construction | 2018 |
| Redington Developments (Brentwood) Limited | Construction | 2020 |
| Redington Developments (Buckle Street) Limited | Construction | 2014 |
| Redington Developments (Care) Limited | Construction | 2022 |
| Redington Developments (Chiswell Green) Limited | Construction | 2018 |
| Redington Developments (Essex) Limited | Construction | 2021 |
| Redington Developments (Garage) Limited | Construction | 2016 |
| Redington Developments (GQ) Limited | Construction | 2021 |
| Redington Developments (Hendon) Limited | Construction | 2018 |
| Redington Developments (Industrial) Limited | Real estate | 2017 |
| Redington Developments (Metro) Limited | Construction | 2019 |
| Redington Developments (SG) Limited | Construction | 2020 |
| Redington Developments (Slaters) Limited | Construction | 2020 |
| Redington Developments (Twyford) Limited | Construction | 2021 |
| Redington Developments (Wembley) Limited | Construction | 2018 |
| Redington Finance Limited | Financial services | 2018 |
| Redlaw Recruitment Trustee Limited | Extraterritorial | 2025 |
| Redmen Properties Ltd | Real estate | 2018 |
| Reds Logistics Ltd | Transport & logistics | 2020 |
| Redsafe Ltd | Administrative & support | 2010 |
| Redsands Properties Limited | Real estate | 2016 |
| Redsquid Communications Ltd | Administrative & support | 2003 |
| Redsquid Limited | Information & communication | 2017 |
| Redstart Capital Ltd | Professional & scientific | 2015 |
| Redwave Films (UK) Limited | Arts & recreation | 1992 |
| Redwoods Property Management Limited | Real estate | 2016 |
| Reef Imperial Ltd | Administrative & support | 2018 |
| Reefacre Ltd. | Construction | 2009 |
| Reenades Ltd | Real estate | 2011 |
| Reessourced Ltd | Construction | 2023 |
| Reeves Gardens Limited | Construction | 2025 |
| Reeves Group Ltd | Construction | 2016 |
| Reeves London Limited | Real estate | 2021 |
| Reeves Mews Ltd | Households | 2021 |
| Reevo 360 Limited | Administrative & support | 2017 |
| Reflex Trading Ltd | Other services | 1995 |
| Refresh CS Ltd | Health & social care | 2012 |
| Refresh Healthcare Limited | Health & social care | 2017 |
| Refresh Holdings Ltd | Real estate | 2021 |
| Refresh Medispa Limited | Health & social care | 2023 |
| Refurb Property Renovations Limited | Construction | 2019 |
| Regan Carpentry Ltd | Manufacturing | 2019 |
| Regancy Enterprises Limited | Administrative & support | 2012 |
| Regcom Ltd | Construction | 2012 |
| Regen Central Ltd | Professional & scientific | 2009 |
| Regency Global Enterprise Ltd | Wholesale & retail | 2022 |
| Regent Automotive Holdings Limited | Extraterritorial | 2014 |
| Regent Automotive Limited | Wholesale & retail | 2007 |
| Regent Court (Peartree) Management Company Limited | Households | 1992 |
| Regent PM Limited | Real estate | 2019 |
| Regent Technical Facilities Limited | Professional & scientific | 2003 |
| Regent Workforce Solutions Limited | Administrative & support | 2019 |
| Regentrack Limited | Construction | 2013 |
| Regis Healthcare Limited | Health & social care | 2013 |
| Regulatory Risk Limited | Information & communication | 2010 |
| Reid & Reid Developments Limited | Real estate | 2020 |
| Reid & Reid Investments Limited | Real estate | 2015 |
| Reilly Cycle Works Limited | Wholesale & retail | 2014 |
| Relations Group Ltd | Professional & scientific | 2002 |