| Reliable Fire Sprinkler (UK) Limited | Wholesale & retail | 2010 |
| Reliable Rent Solution Ltd | Real estate | 2026 |
| Reliance Logistics Solutions Ltd | Transport & logistics | 2025 |
| Reload Logistics Ltd | Transport & logistics | 2020 |
| Relocations Nationwide Ltd | Hospitality | 2020 |
| Remeo Healthcare Limited | Administrative & support | 2012 |
| Remeo Property Limited | Health & social care | 2019 |
| Remla Cafe Ltd | Hospitality | 2026 |
| Remona Limited | Health & social care | 2014 |
| Rendersoft Limited | Information & communication | 1993 |
| Renew and Sustain Solutions Limited | Professional & scientific | 2017 |
| Renew Recruitment Consultancy Limited | Administrative & support | 2016 |
| Renohaus Ltd | Construction | 2021 |
| Rent & Ride Ltd | Administrative & support | 2018 |
| Rent a CAB Ltd | Wholesale & retail | 2023 |
| Rentokil Dormant (NO.6) Ltd | Extraterritorial | 1974 |
| Rentokil Initial (1896) Limited | Households | 1896 |
| Rentokil Initial (1993) Limited | Professional & scientific | 1993 |
| Rentokil Initial 1927 PLC | Administrative & support | 1927 |
| Rentokil Initial Americas Limited | Administrative & support | 2011 |
| Rentokil Initial Asia Pacific Limited | Professional & scientific | 1986 |
| Rentokil Initial Brazil Limited | Administrative & support | 2011 |
| Rentokil Initial Finance Limited | Administrative & support | 2004 |
| Rentokil Initial Holdings Limited | Professional & scientific | 1994 |
| Rentokil Initial Investments South Africa | Professional & scientific | 1951 |
| Rentokil Initial Pension Trustee Limited | Extraterritorial | 1959 |
| Rentokil Initial PLC | Administrative & support | 2005 |
| Rentokil Initial Services Limited | Administrative & support | 1934 |
| Rentokil Initial UK Ltd | Administrative & support | 1935 |
| Rentokil Insurance Limited | Financial services | 1960 |
| Rentokil Limited | Administrative & support | 1926 |
| Rentokil Overseas Holdings Limited | Professional & scientific | 1959 |
| Rentokil Property Care Limited | Construction | 1994 |
| Rentokil Property Holdings Limited | Real estate | 1980 |
| Reotra Limited | Health & social care | 2021 |
| Repaero Limited | Transport & logistics | 2008 |
| Repair Outlet Limited | Wholesale & retail | 2024 |
| Repatriation Medical Services Limited | Health & social care | 2023 |
| Replenish Group Ltd | Information & communication | 2024 |
| Republic Cargo Systems Limited | Transport & logistics | 2011 |
| REQ Limited | Information & communication | 2023 |
| Reselit Ltd | Real estate | 2022 |
| Reset Premium Ltd | Wholesale & retail | 2026 |
| Residential Development Facilitation Ltd | Professional & scientific | 2016 |
| Response Therapies Ltd | Health & social care | 2015 |
| Retail Banking Research Limited | Administrative & support | 1991 |
| Rethink Global Ltd | Arts & recreation | 2011 |
| Rethinking Removals | Professional & scientific | 2023 |
| Reva Clinical Consultants Limited | Administrative & support | 2011 |
| Revenue Plus Ltd | Administrative & support | 2021 |
| Revenuru Ltd | Information & communication | 2024 |
| Revive Auto Repairs Ltd | Wholesale & retail | 2025 |
| Revo Cars Ltd | Transport & logistics | 2021 |
| Revolution Music Limited | Information & communication | 2016 |
| Revvedup AI Ltd | Information & communication | 2024 |
| Rewards Training Recruitment Consultancy (Scotland) Limited | Education | 1998 |
| Rewards Training Recruitment Consultancy Limited | Professional & scientific | 1997 |
| Reyna Trans Ltd | Wholesale & retail | 2025 |
| Rezz Renovations Ltd | Construction | 2024 |
| RFP Logistics Ltd | Transport & logistics | 2019 |
| RGC Construction Service Ltd | Construction | 2024 |
| Rgen Media Ltd | Information & communication | 2021 |
| RGT Limited | Extraterritorial | 2014 |
| RH Bubble Drinks Ltd | Hospitality | 2021 |
| RH Cawley Limited | Professional & scientific | 2019 |
| RH10 Dog Walking & Pet Services Ltd | Agriculture & fishing | 2023 |
| RH10 Fitness Ltd | Arts & recreation | 2018 |
| Rhaw Homes Ltd | Real estate | 2022 |
| Rhealisation LLP | | 2007 |
| Rheavendors UK Ltd | Wholesale & retail | 2017 |
| RHF Digital Ltd | Information & communication | 2024 |
| Rhoworld UK Ltd | Professional & scientific | 2022 |
| RHV Properties Ltd | Real estate | 2017 |
| RI Dormant NO.18 Limited | Extraterritorial | 1934 |
| RI Dormant NO.20 Limited | Extraterritorial | 1985 |
| Rialto (M&E) Commercial Services Ltd | Professional & scientific | 2021 |
| Rice & Cole Limited | Wholesale & retail | 1962 |
| Richard Cornell Ltd | Professional & scientific | 2019 |
| Richard Lott Consulting Ltd | Information & communication | 2014 |
| Richreach Education Ltd | Education | 2023 |
| Rickeli Services Limited | Education | 2018 |
| Ridge Top Consulting Ltd | Professional & scientific | 2017 |
| Ridgemead Court Management Company Limited | Real estate | 2013 |
| RIE Gateau Ltd | Manufacturing | 2020 |
| Rifan Property Ltd | Real estate | 2024 |
| Rift Audio Ltd | Information & communication | 2024 |
| Rift Fitness Ltd | Education | 2023 |
| Right Angles Limited | Construction | 2002 |
| Rightbuild & Maintenance Limited | Construction | 2014 |
| Riley's Property Management Ltd | Construction | 2024 |
| Rindle AI Limited | Information & communication | 2022 |
| Ringmer Chippy Limited | Hospitality | 2017 |
| RIO Construction Ltd | Construction | 2021 |
| Rioz Global Ltd | Transport & logistics | 2018 |
| Ripondean Properties Ltd. | Real estate | 2007 |
| Rippin & Associates Ltd | Administrative & support | 2020 |
| RIS Accountancy Ltd | Professional & scientific | 2026 |
| RIS Group of Services Ltd | Administrative & support | 2025 |
| RIS Immigration Services Ltd | Professional & scientific | 2025 |
| RIS Security Limited | Administrative & support | 2022 |