| RBX Solutions Ltd | Real estate | 2008 |
| RCF Creative Limited | Administrative & support | 2023 |
| RCH Design Limited | Arts & recreation | 2014 |
| Rebecca Corley Interiors Limited | Households | 2014 |
| Rebecca White Ltd | Health & social care | 2023 |
| Rebl CX Ltd | Professional & scientific | 2025 |
| Red Crocodile Limited | Professional & scientific | 2009 |
| Red Gables Management Company (Ascot) Limited | Households | 2008 |
| Red Kite Analytics Ltd | Professional & scientific | 2014 |
| Red Mare Ltd | Extraterritorial | 2021 |
| Red Peak Properties Ltd | Real estate | 2021 |
| Red Robin Capital LLP | | 2022 |
| Red Robin SA Ltd | Hospitality | 2023 |
| Red Summerwood Limited | Professional & scientific | 2013 |
| Redd Windows Ltd | Construction | 2017 |
| Redefine Design Limited | Other services | 2014 |
| Redland Water Proofing Limited | Construction | 2017 |
| Reegal Limited | Other services | 2022 |
| Reelmaster Ltd | Professional & scientific | 2025 |
| Regal Consultancy Ltd | Professional & scientific | 2020 |
| Regency Roofing Company Limited | Construction | 1997 |
| Reid Office Supplies Limited | Real estate | 1998 |
| Reinforce Group Ltd | Administrative & support | 2015 |
| Relaxat Group Ltd | Real estate | 2023 |
| Renew Projects Limited | Construction | 2009 |
| Renewable Energy Investments Limited | Other services | 2010 |
| Restore Voice Limited | Health & social care | 2023 |
| Revival Vehicle Restorations Ltd | Wholesale & retail | 2021 |
| RFJ Tandy Group Ltd | Real estate | 2021 |
| Rftech Limited | Information & communication | 2013 |
| RGB Sales Consulting Ltd | Professional & scientific | 2015 |
| RGH Ascot Ltd | Wholesale & retail | 2011 |
| RGM Companies Ltd | Wholesale & retail | 2023 |
| Rhiannon Feature Film Limited | Information & communication | 2025 |
| Rhinotech Analytics Ltd | Information & communication | 2024 |
| Rhkh Group Limited | Real estate | 2017 |
| Rhona Glazebrook Ltd | Professional & scientific | 2023 |
| Rice Associates Limited | Extraterritorial | 2024 |
| Richard Anthony Ford Consulting Ltd | Information & communication | 2017 |
| Ridge Partners Ltd | Financial services | 2021 |
| Ridgefield Holding Limited | Health & social care | 2019 |
| Ridings Close (Ascot) Management Company Limited | Households | 2014 |
| Riversdale (High Wycombe) Freeholds Co Ltd | Real estate | 2016 |
| Riverside Country Developments Limited | Construction | 2000 |
| Riverside Global Logistics Limited | Transport & logistics | 2012 |
| RJG Estates Ltd | Real estate | 2018 |
| Rjha Ltd | Professional & scientific | 2012 |
| RJS Supplies INT. Limited | Wholesale & retail | 2015 |
| RKZ Developments Limited | Construction | 2025 |
| RLG Residential Ltd | Professional & scientific | 2024 |
| Robert Tearle Limited | Information & communication | 2012 |
| Roboclean Group Ltd | Administrative & support | 2026 |
| Robotic Marine Solutions Ltd | Professional & scientific | 2026 |
| Rock Technology Limited | Administrative & support | 2014 |
| Rockhold Aylesbury Limited | Real estate | 2024 |
| Rockhold Group Limited | Professional & scientific | 2015 |
| Rockhold KEW Limited | Construction | 2020 |
| Rockhold Limited | Professional & scientific | 2015 |
| Rockhold Walpole Limited | Construction | 2024 |
| Rodrigues Business Consultancy Ltd | Professional & scientific | 2026 |
| Roebuck HD Limited | Construction | 2018 |
| Rogers Bros. Limited | Real estate | 1930 |
| Rognus Limited | Financial services | 2018 |
| Rondel Construction Limited | Construction | 2025 |
| Rondelay Limited | Professional & scientific | 2020 |
| Roof Away UK Limited | Construction | 2025 |
| Rosewood (Ascot) Management Limited | Real estate | 2010 |
| Rossiter James Ltd | Professional & scientific | 2025 |
| Rotolight Industries Limited | Manufacturing | 2024 |
| Rover Partners LLP | | 2015 |
| Roxolid Investment Company | Professional & scientific | 2011 |
| RSR Advisory Services Ltd | Professional & scientific | 2018 |
| RTO Consultancy Ltd | Professional & scientific | 2020 |
| Rtrac Consulting Limited | Information & communication | 2023 |
| Run Civils Ltd | Construction | 2023 |
| Run of Show Productions Limited | Information & communication | 2022 |
| Russell Plumbing Limited | Construction | 2006 |
| Rustic Revelry Catering Limited | Hospitality | 2024 |
| Rutley Advisory Group Limited | Professional & scientific | 2026 |
| RW Rowsell Limited | Real estate | 2016 |
| Rwel Ltd | Information & communication | 2018 |
| Rydal Consultancy Ltd | Professional & scientific | 2022 |
| RYE Fine Wines Limited | Wholesale & retail | 2020 |
| RZ Clark Limited | Real estate | 2026 |
| S & N Wellness Ltd | Wholesale & retail | 2026 |
| S J Locuming Limited | Wholesale & retail | 2023 |
| S Kings Interiors Ltd | Construction | 2022 |
| S&F Enterprises Limited | Administrative & support | 2010 |
| S&P Bracknell Ltd | Hospitality | 2025 |
| Saeso Ltd | Information & communication | 2020 |
| Saipem Engineering S.P.A Limited | Financial services | 2025 |
| SAL Properties Limited | Real estate | 2001 |
| Salford Close Management Company Ltd | Households | 2019 |
| Salon C Limited | Other services | 2017 |
| SAM Conveyancing Ltd | Other services | 2013 |
| Samaa Lounge Limited | Hospitality | 2024 |
| Samuel James PM Ltd | Construction | 2024 |
| Sandown Floors Ltd | Construction | 2022 |
| Santa Maria Investments Limited | Construction | 2021 |
| SAP Development Properties Limited | Construction | 2013 |