| Rivero Adjusting Services Ltd | Financial services | 2020 |
| Riverside Court (Newbury) Management Company Limited | Households | 1997 |
| RJ Property Surveyors Ltd | Professional & scientific | 2019 |
| RJF Investments Ltd | Real estate | 2026 |
| RJP Installs Limited | Information & communication | 2013 |
| RK Curry Limited | Hospitality | 2026 |
| RK Roller Events Ltd | Arts & recreation | 2024 |
| RL Creatives Limited | Education | 2018 |
| RM Consultancy Services Ltd | Information & communication | 2024 |
| RM Daley Services Ltd | Professional & scientific | 2020 |
| RMA Surveyors Limited | Professional & scientific | 2015 |
| Rmilner Consultants Limited | Information & communication | 2020 |
| Road Runner Trans (UK) Ltd | Transport & logistics | 2013 |
| Roadside Tyres (Thames Valley) Limited | Wholesale & retail | 2015 |
| Roadtrip Industries Ltd | Manufacturing | 2025 |
| Roam Record Ltd | Information & communication | 2025 |
| Robert Gatward Jewellers Limited | Wholesale & retail | 2011 |
| Robert Yarde Limited | Information & communication | 2014 |
| Robins Audio Limited | Administrative & support | 2013 |
| Robinson Foods LLP | | 2004 |
| Robinson&Co Ltd | Professional & scientific | 2025 |
| Robora AI Ltd | Information & communication | 2023 |
| Robott Consulting Limited | Professional & scientific | 2016 |
| ROCK66 Ltd | Manufacturing | 2023 |
| Rockliff Productions Ltd | Arts & recreation | 2024 |
| Rockstone Automotive Ltd | Wholesale & retail | 2026 |
| Rockstone Motors Ltd | Wholesale & retail | 2026 |
| Roderick Anthony Limited | Other services | 2003 |
| Roebuck Photography Ltd | Professional & scientific | 2024 |
| Rogers Legal Limited | Professional & scientific | 2014 |
| Rogue Leader 1 Ltd | Financial services | 2026 |
| Rohan Designs Limited | Wholesale & retail | 1981 |
| Rohan Group Limited | Financial services | 1998 |
| ROK MAX Limited | Wholesale & retail | 2014 |
| ROK Street Food Events Ltd | Hospitality | 2025 |
| Rokk Services Ltd | Professional & scientific | 2013 |
| Rolls Investments Ltd | Information & communication | 2026 |
| Roman Building Design & Construction Limited | Construction | 2005 |
| Romano Court Management Company Limited | Extraterritorial | 1995 |
| Romans Management Company (Silchester) Limited | Administrative & support | 2012 |
| Ronadec Ltd. | Construction | 2018 |
| Roof Top Consultancy Ltd | Construction | 2023 |
| Roof Trade Limited | Construction | 2004 |
| Rook Investigations Ltd | Professional & scientific | 2023 |
| ROOT21 Ltd | Professional & scientific | 2019 |
| Roots Estate Agency Limited | Real estate | 2015 |
| ROR International Ltd | Other services | 1986 |
| Roscoff Holdings Limited | Financial services | 2023 |
| Rose Retail Ltd. | Wholesale & retail | 2018 |
| Rosemary Holdings Limited | Financial services | 2024 |
| Rosie Kime Ltd | Professional & scientific | 2023 |
| Ross Brooke Holdings Limited | Professional & scientific | 2020 |
| Ross Brooke Limited | Professional & scientific | 1998 |
| ROT Private Limited | Transport & logistics | 2022 |
| Rothwell House Management Limited | Real estate | 2014 |
| Rowbury Farm Limited | Agriculture & fishing | 2002 |
| Rowbury Farming Ltd | Agriculture & fishing | 2026 |
| Rowley Mews Management Company Limited | Households | 1987 |
| Roxford Capital Ltd | Professional & scientific | 2017 |
| Royal Tech Limited | Information & communication | 2019 |
| RP Consultant Partners Limited | Professional & scientific | 2015 |
| RP Management Services Ltd | Professional & scientific | 2025 |
| RSK Entertainment Limited | Arts & recreation | 2005 |
| RSK Plumbing and Heating Limited | Other services | 2013 |
| Rsvp Event Hire Limited | Administrative & support | 2003 |
| RTC & Associates Ltd | Extraterritorial | 2005 |
| Rtcc Berkshire 1993 Ltd | Wholesale & retail | 2020 |
| Rubber and Plastic Collection Services Limited | Wholesale & retail | 1991 |
| Rubimont Limited | Construction | 2026 |
| Ruby Lesure Ltd | Hospitality | 2025 |
| Rudby Consulting Services Ltd | Professional & scientific | 2023 |
| Rudd & Co Limited | Professional & scientific | 2013 |
| Rufus Stone Limited Editions Limited | Information & communication | 2010 |
| Rumlin Limited | Information & communication | 2025 |
| Rupert's Holiday Lodges Limited | Hospitality | 2026 |
| Russell Court Management (Newbury) Limited | Households | 2004 |
| Russell Estates Limited | Construction | 1987 |
| Ruth Gardiner Horses Limited | Wholesale & retail | 2020 |
| Rwjl Investments Limited | Professional & scientific | 2020 |
| RWS Management Group Ltd | Financial services | 2018 |
| RWS Marine Ltd | Arts & recreation | 2018 |
| RWS Southern Properties Limited | Financial services | 2017 |
| Ryder Street Pontcanna Management (Cardiff) Limited | Households | 2005 |
| Ryehill Golf Limited | Arts & recreation | 2019 |
| Ryness Electrical Supplies Limited | Wholesale & retail | 2002 |
| Ryness Holdings Limited | Extraterritorial | 2006 |
| S & C Slatter Limited | Construction | 2008 |
| S & N Surfacing Ltd | Construction | 2021 |
| S & S Holdings (Newbury) Ltd | Financial services | 2026 |
| S & T Design Limited | Arts & recreation | 2009 |
| S D a Recycling Services LLP | | 2014 |
| S Desai Limited | Administrative & support | 2007 |
| S J B Design and Events Limited | Arts & recreation | 1997 |
| S&E Finance Ltd | Real estate | 2021 |
| S.A.B Production Ltd | Information & communication | 2018 |
| S.Finch Services Limited | Construction | 2025 |
| S.G. Hill Decorators Limited | Construction | 2001 |
| S.W.G. Holdings (U.K.) Limited | Financial services | 2022 |
| S.W.G. Limited | Manufacturing | 1993 |
| S2C Developments Ltd | Construction | 2023 |