| RB1 Ltd. | Information & communication | 2011 |
| Rbgo Ltd | Administrative & support | 2023 |
| RBM Properties South West Limited | Real estate | 2023 |
| Rbstech Consulting Limited | Professional & scientific | 2024 |
| RC Baker Property Ltd | Real estate | 2025 |
| RC Baker Services Ltd | Construction | 2026 |
| RC Cleaning Solution Ltd | Administrative & support | 2024 |
| RC Invest Limited | Wholesale & retail | 2024 |
| RCA Carpentry Services Limited | Construction | 2014 |
| Rccg True Worshippers Assembly | Other services | 2016 |
| RCM Catering Equipment Limited | Hospitality | 2005 |
| Rcma Limited | Information & communication | 2014 |
| RCW Plumbing & Heating Ltd | Construction | 2021 |
| RD Direct Ltd | Transport & logistics | 2022 |
| RD Haulage Limited | Transport & logistics | 2023 |
| RD Twyford Sushi Ltd | Hospitality | 2018 |
| RD5 Ltd | Wholesale & retail | 2016 |
| RDN Properties Limited | Real estate | 2013 |
| Rdph Consultants Ltd | Information & communication | 2014 |
| RE Performance (Europe) Limited | Wholesale & retail | 2018 |
| Re-Biked Ltd | Wholesale & retail | 2026 |
| Re-Thinking Limited | Professional & scientific | 1998 |
| Reach Analytics Ltd | Information & communication | 2016 |
| Reach and Wash Limited | Extraterritorial | 1999 |
| Reach Digital Consulting Limited | Administrative & support | 2021 |
| Reach Inclusive Arts | Arts & recreation | 2005 |
| React Technical Services Ltd | Construction | 2016 |
| Reactive Energy Solutions Limited | Construction | 2024 |
| Real Deal FM Solutions Ltd | Administrative & support | 2021 |
| Real Kingdoms Adventures Ltd | Education | 2023 |
| Real Print Management Ltd | Manufacturing | 2008 |
| Real Supermarkets Ltd | Wholesale & retail | 2024 |
| Really Good Holidays Ltd | Administrative & support | 2009 |
| Really Rather Wild Books Ltd | Information & communication | 2020 |
| Realm Pictures Limited | Information & communication | 2009 |
| Realro Properties Limited | Real estate | 2023 |
| Realvue Limited | Information & communication | 2023 |
| Reandon Ltd | Health & social care | 2013 |
| Rebecca Hogan Trading Limited | Hospitality | 2021 |
| Rebecca Speed Ltd | Construction | 2025 |
| Rebel Heart Collective Ltd | Professional & scientific | 2023 |
| Rebellion Cigars Ltd | Wholesale & retail | 2020 |
| Rebellion Presence Ltd | Education | 2025 |
| Rebfill Transport Ltd | Transport & logistics | 2026 |
| Recal Cyber Ltd | Administrative & support | 2023 |
| Reconsult XL Ltd | Other services | 2018 |
| Recsam Group Limited | Wholesale & retail | 2021 |
| Recsam Healthcare Ltd | Health & social care | 2019 |
| Rectory Court RTM Company Limited | Households | 2018 |
| Red & Green Leisure Ltd | Hospitality | 2018 |
| Red Brick Barn Ltd | Agriculture & fishing | 2019 |
| Red DOT Consult Ltd | Professional & scientific | 2023 |
| Red Five PR Ltd | Professional & scientific | 2016 |
| Red Jelly Ltd | Information & communication | 2018 |
| Red Jellyfish Consulting Ltd | Professional & scientific | 2023 |
| Red Kite Building Services Limited | Construction | 2017 |
| Red Lane Properties Limited | Real estate | 2017 |
| Red Lodge Canine Country Club Limited | Agriculture & fishing | 2022 |
| Red Nose Circus Limited | Arts & recreation | 2018 |
| Red Notice Media Limited | Arts & recreation | 2018 |
| Red Parrot Recruitment Limited | Administrative & support | 2018 |
| Red Parrot Staff Limited | Administrative & support | 2025 |
| Red Penguin Limited | Professional & scientific | 2011 |
| Red PIN Properties Limited | Real estate | 2016 |
| Red Rocket Commercial Properties Limited | Real estate | 2011 |
| Red Rocket Graphic Design Limited | Administrative & support | 1999 |
| Red Rockingchair Limited | Information & communication | 2014 |
| Red Sea East African Restaurant Ltd | Wholesale & retail | 2021 |
| Red Spear Group Limited | Administrative & support | 2016 |
| Red Stone UK Investments Limited | Real estate | 2015 |
| RED45 Limited | Professional & scientific | 2012 |
| Redbox 72 Limited | Real estate | 2023 |
| Rede Steuart Consultancy Ltd. | | 1993 |
| Redfm Ltd | Real estate | 2019 |
| Redfox Care Services Limited | Health & social care | 2019 |
| Redfox Logistics Ltd | Transport & logistics | 2025 |
| Redheadpr Limited | Professional & scientific | 2003 |
| Redhouse Property Management Services Ltd | Real estate | 2017 |
| Redhouse Rise Management Limited | Real estate | 2005 |
| Reditus Business Consulting Ltd | Professional & scientific | 2024 |
| Redlands Charlotte Mews Management Company Limited | Households | 2010 |
| Redlands Orchard and Gardens Ltd | Agriculture & fishing | 2021 |
| Redline Racing Ltd | Hospitality | 2025 |
| Redman Roofing Ltd | Extraterritorial | 2013 |
| Redman Systems Limited | Information & communication | 2025 |
| Redouble UK Limited | Professional & scientific | 2013 |
| Redrobin Enterprises Ltd. | Real estate | 2017 |
| Reds Home Improvements Ltd | Construction | 2018 |
| Redshark Media Limited | Administrative & support | 2015 |
| Redsky Plumbing and Heating Services Ltd | Construction | 2022 |
| Redvers Services Limited | Wholesale & retail | 2018 |
| Reed Court (Swindon) Management Company Limited | Real estate | 2010 |
| Reedie Solutions Limited | Information & communication | 2023 |
| Reeves and Co Properties Ltd | Real estate | 2024 |
| Reflect Consultancy Limited | Administrative & support | 2015 |
| Reflections Beauty Studio Ltd | Administrative & support | 2026 |
| Reformu Cleaning Services Plus Ltd | Administrative & support | 2019 |
| Refurb Outlet Ltd | Wholesale & retail | 2025 |
| Regal Executive Transport Ltd | Transport & logistics | 2019 |
| Regal Homemaker Limited | Construction | 1997 |