| Rainbow Internetworks Limited | Information & communication | 2000 |
| Rainbow Nursery & Preschool Ltd | Health & social care | 2023 |
| Rainbow Oasis Capital Limited | Financial services | 2024 |
| Raines Property Ltd | Real estate | 2023 |
| Rainham Services Group Limited | Construction | 2017 |
| RAJ CAB & Food Delivery Services Limited | Transport & logistics | 2019 |
| Raja Cuisine UK Ltd | Hospitality | 2023 |
| Ralbru FUN and Games Limited | Wholesale & retail | 2021 |
| Randall Lettings Ltd | Households | 2026 |
| Range Rover Spares Ltd | Wholesale & retail | 2025 |
| Ranson Properties and Consultancy Limited | Information & communication | 2015 |
| Rashita Limited | Other services | 2016 |
| RAT Buster Ltd | Extraterritorial | 2023 |
| Ratcliffe & Curtis Estates Limited | Real estate | 2025 |
| Ratnarajan Enterprise Ltd | Health & social care | 2024 |
| Raulfast Ltd | Transport & logistics | 2025 |
| Ravensbourne PCN Ltd | Health & social care | 2025 |
| Raymond-Schortz UK Limited | Construction | 2018 |
| Rayner Marine Solutions Ltd | Administrative & support | 2019 |
| RAZ BMR Limited | Transport & logistics | 2017 |
| RB Groundworks (South East) Limited | Construction | 2011 |
| RB Interiors (Kent) Limited | Construction | 2012 |
| RB Windows Kent Ltd | Construction | 2015 |
| RBC Services Ltd | Hospitality | 2018 |
| Rccg Rock of Redemption (Apata Irapada) | Other services | 2013 |
| RCO Horizon Properties Ltd | Real estate | 2026 |
| RD Welding Ltd | Construction | 2015 |
| Rdrive Ltd | Wholesale & retail | 2022 |
| Rdrive Performance Limited | Wholesale & retail | 2024 |
| RDT European Ltd | Transport & logistics | 2020 |
| RDT Kent Limited | Transport & logistics | 2022 |
| RE Generation Earth Limited | Agriculture & fishing | 2020 |
| React Cleaning Ltd | Administrative & support | 2020 |
| Readyanalyst Ltd. | Professional & scientific | 2017 |
| Readyhands Ltd | Administrative & support | 2024 |
| Real Life Properties Ltd | Real estate | 2026 |
| Reality Golf Ltd | Manufacturing | 2019 |
| Really Motoring Limited | Real estate | 2016 |
| Realm Contracting Limited | Administrative & support | 2015 |
| Reams IT Consulting Limited | Information & communication | 2015 |
| Reao Limited | Professional & scientific | 2021 |
| Rebrich Lettings Ltd | Real estate | 2019 |
| Rebus Homes Ltd | Real estate | 2016 |
| Recap Services Solutions Limited | Manufacturing | 2018 |
| Reclann Property Ltd | Real estate | 2025 |
| Red Knot Joinery Ltd | Manufacturing | 2025 |
| Reddendi Limited | Households | 2016 |
| Redding Design & Build Ltd | Construction | 2024 |
| Redfox Facilities Limited | Extraterritorial | 2025 |
| Redrox Limited | Information & communication | 2007 |
| Redwood Piling Contractors Limited | Construction | 2019 |
| Reebco Ltd | Professional & scientific | 2015 |
| Reef Raffle Ltd | Wholesale & retail | 2025 |
| Rees Mechanical Handling Ltd | Manufacturing | 2016 |
| Reeves & Sons (China & Furniture) Limited | Real estate | 1963 |
| Refine Architecture Ltd | Professional & scientific | 2017 |
| Refine Developments (Kent) Ltd | Construction | 2025 |
| Refined Automotive Services Ltd | Wholesale & retail | 2021 |
| Refreshing Ersin Ltd | Wholesale & retail | 2023 |
| Refurbish My House Ltd | Construction | 2014 |
| Regency Export Services Ltd | Transport & logistics | 2001 |
| Regency Grounds & Estates Ltd | Administrative & support | 2025 |
| Regis Cleaning Services Ltd | Administrative & support | 2018 |
| Regis Desserts Limited | Hospitality | 2025 |
| Rehabilitation Manufacturing Services Limited | Manufacturing | 1997 |
| Rehoboth Health Limited | Health & social care | 2025 |
| Reign Developments Limited | Construction | 2023 |
| REJ Fire Services Ltd | Public administration | 2026 |
| Remochanmi Limited | Real estate | 2019 |
| Renae-Alexis Limited | Health & social care | 2023 |
| Renaissance Preeminent Ltd | Health & social care | 2025 |
| Rendelivery Ltd | Transport & logistics | 2025 |
| Renegade Film Services Ltd | Information & communication | 2017 |
| Renraw Construction Ltd | Construction | 2025 |
| Rent IT NOW Ltd | Wholesale & retail | 2025 |
| Rent Master Properties Ltd | Households | 2025 |
| Renu by Design Limited | Administrative & support | 2008 |
| Repair and Shine UK Limited | Wholesale & retail | 2018 |
| Repair Bro's Ltd | Wholesale & retail | 2019 |
| Repair E-Bikes Ltd | Manufacturing | 2023 |
| Request a Whippy Ltd | Information & communication | 2026 |
| Resolve Facilities Ltd | Administrative & support | 2023 |
| Respiricare Limited | Health & social care | 2011 |
| Rest Asssured Healthcare Services Ltd. | Health & social care | 2011 |
| Restored: Skin Care Ltd | Wholesale & retail | 2023 |
| Resus Rangers Workshops Ltd | Education | 2025 |
| Retail Collective POS Displays Ltd | Construction | 2022 |
| Retail Joinery Holdings Ltd | Real estate | 2025 |
| Retail Joinery Ltd | Manufacturing | 2010 |
| Retrochic Entertainment Ltd | Arts & recreation | 2025 |
| Reynolds Window and Exterior Cleaning Ltd | Administrative & support | 2024 |
| RH Parker Construction Ltd | Construction | 2017 |
| RH Parker Limited | Construction | 2001 |
| Rheims Court Residents Association Limited | Households | 1996 |
| Rhematrade Investments Limited | Professional & scientific | 2008 |
| Rhinefield Property Ltd | Real estate | 2019 |
| RHK Service Ltd | Wholesale & retail | 2024 |
| RHP Group Kent Limited | Financial services | 2024 |
| Riaan Holdings Ltd | Financial services | 2025 |
| Richard Noble Consultancy Limited | Professional & scientific | 2025 |