| Richtron Global Tech Co., Ltd. | Wholesale & retail | 2025 |
| Rick's Bricks Limited | Real estate | 2019 |
| Ricketts Enterprise Limited | Health & social care | 2013 |
| Ricketts Property Limited | Real estate | 2020 |
| Ricky Smith Limited | Administrative & support | 2024 |
| RICKY1 Limited | Transport & logistics | 2018 |
| Ride High Limited | Health & social care | 2010 |
| Ride on Motorcycle Training Limited | Information & communication | 2015 |
| Ride Smart Bucks Limited | Transport & logistics | 2022 |
| Riders for Well Being International Limited | Health & social care | 2016 |
| Ridge Pebbledashing Limited | Construction | 1989 |
| Ridgeway Bavarian Limited | Wholesale & retail | 2012 |
| Ridgeway Community Trust | Other services | 2013 |
| Ridgeway Garages (Newbury) Limited | Wholesale & retail | 1996 |
| Ridgeway Healthcare Ltd | Administrative & support | 2022 |
| Ridgeway TPS Limited | Wholesale & retail | 2007 |
| Ridings & Hyde Management Company Limited | Administrative & support | 2013 |
| Ridout Holdings Limited | Financial services | 2019 |
| Ridz Trading Ltd | Professional & scientific | 2026 |
| Ries Residential Ltd | Real estate | 2024 |
| Rifco Holdings Ltd | Real estate | 2019 |
| Rifco Property Services Ltd | Real estate | 2019 |
| Rigelx Ltd | Information & communication | 2025 |
| Right Asset Limited | Real estate | 2019 |
| Right Brain Thinking Ltd | Education | 2023 |
| Right House Ltd | Real estate | 2025 |
| Right Script Limited | Information & communication | 2017 |
| Right Site Property Management Ltd | Households | 2021 |
| Right-Advice Mortgage Consultancy Ltd. | Financial services | 2004 |
| RIGHTJOB4.ME Limited | Wholesale & retail | 2012 |
| Rightmove Financial Services Limited | Information & communication | 2018 |
| Rightmove Group Limited | Information & communication | 2000 |
| Rightmove Landlord and Tenant Services Limited | Financial services | 2009 |
| Rightmove PLC | Information & communication | 2007 |
| Rigi Consulting Limited | Real estate | 2006 |
| Rigo Consultancy Limited | Information & communication | 2019 |
| Rigtig Holdings Limited | Financial services | 2024 |
| Rika Benefits Ltd | Professional & scientific | 2026 |
| Riley Group Ltd | Construction | 2016 |
| Riley Homes Ltd | Real estate | 2023 |
| Riley Property Holdings Ltd | Construction | 2020 |
| RIM Driving Services Ltd | Transport & logistics | 2018 |
| RIM Scaffolding (Leeds) Limited | Construction | 2000 |
| Rimz Beauty Ltd | Other services | 2025 |
| Ring Edge Ltd | Information & communication | 2024 |
| Ringo Cars Ltd | Wholesale & retail | 2017 |
| Ringwood Export Limited | Extraterritorial | 2003 |
| Rinoah Limited | Professional & scientific | 2018 |
| Rinsed Exterior Cleaning Ltd | Administrative & support | 2023 |
| Rinsed Window Cleaning Ltd | Administrative & support | 2023 |
| Rinseit Ltd | Administrative & support | 2024 |
| RIO Logistics Ltd | Construction | 2018 |
| Rioja Business Development Limited | Professional & scientific | 2011 |
| Riot Labs INT Ltd | Transport & logistics | 2023 |
| Riot Labs Ltd | Manufacturing | 2017 |
| Ripley Inc Ltd | Information & communication | 2023 |
| Ripley Property Investments LLP | | 2021 |
| Ripnar Studios Ltd | Information & communication | 2021 |
| Ripped Runner Ltd | Education | 2021 |
| Rippled Limited | Professional & scientific | 2024 |
| Ripples Business and IT Consultants Limited | Information & communication | 2019 |
| Rise Contracting Ltd | Construction | 2024 |
| Rise OUT Ltd | Administrative & support | 2023 |
| Rise Recruitment Solutions Ltd | Administrative & support | 2023 |
| Rise Simukai Ltd | Administrative & support | 2016 |
| Riseley Development 1 Ltd | Real estate | 2022 |
| Riselot Services Limited | Health & social care | 2023 |
| Riseup Tuition Ltd | Education | 2023 |
| Rishaanraj Ltd | Information & communication | 2017 |
| Rishav Consultancy Limited | Professional & scientific | 2019 |
| Rishav Properties UK Limited | Real estate | 2024 |
| Rishav Traders (UK) Limited | Professional & scientific | 2018 |
| Rising Star Fitness Ltd | Education | 2023 |
| Rising Stars (9 to 5) Limited | Health & social care | 2021 |
| Rising Stars (Grove Hill) Limited | Health & social care | 2021 |
| Rising Stars (Redbourn) Limited | Health & social care | 2022 |
| Rising Stars Holdings Limited | Health & social care | 2021 |
| Riskex Limited | Information & communication | 2004 |
| Rita K9 Ltd | Administrative & support | 2025 |
| Rita Ross Coaching and Consulting Ltd | Administrative & support | 2018 |
| Rita Solanki Limited | Education | 2007 |
| Rite Advisory Services Limited | Professional & scientific | 2011 |
| Ritecapital Investments Limited | Real estate | 2018 |
| Riteconcierge Services Limited | Wholesale & retail | 2018 |
| Ritedevelopments Limited | Construction | 2018 |
| Riteinterior Design Ltd | Construction | 2018 |
| Ritetech Solutions Ltd | Information & communication | 2019 |
| Rithik and Brothers Ltd | Wholesale & retail | 2024 |
| Rival Campers Ltd | Manufacturing | 2023 |
| Rival Insurance Services Limited | Financial services | 2001 |
| Rivaro Roaming Ltd | Information & communication | 2025 |
| Rivaro Travel Ltd | Administrative & support | 2020 |
| Rivendell Info Systems Ltd | Information & communication | 2022 |
| River Lily Ltd | Health & social care | 2019 |
| River Park Consulting Group Ltd | Information & communication | 2026 |
| River Talent Limited | Professional & scientific | 2019 |
| River View Solutions Limited | Professional & scientific | 2021 |
| Riverlinx Holdings Limited | Financial services | 2019 |
| Riverlinx Limited | Construction | 2019 |
| Riverside (Olney) Management Company Limited | Households | 2005 |