| RMQ Rental and Retail Ltd | Other services | 2026 |
| Roasties Reloaded Ltd | Extraterritorial | 2026 |
| Robert Irving Limited | Other services | 2015 |
| Roberts MG Specialists Ltd | Wholesale & retail | 2024 |
| Roberts Polo Limited | Administrative & support | 2023 |
| Robertson's Property Ltd | Real estate | 2019 |
| Robertsons Estates Limited | Financial services | 2023 |
| Rochester Court (Garston) Management Co. Limited | Households | 1993 |
| Rock & Lola Ltd | Wholesale & retail | 2022 |
| Rock House Drinks Limited | Professional & scientific | 2025 |
| Rock-Paper-Scissors-Shoot Limited | Information & communication | 2021 |
| Rockfort Construction Limited | Construction | 2018 |
| Rocks and Roses PR Limited | Professional & scientific | 2023 |
| Rockwood Holdings Ltd | Financial services | 2022 |
| Rocky Great Property Ltd | Real estate | 2019 |
| Roddy Kane Marketing Consultancy (OS) Ltd | Information & communication | 2015 |
| Rogue TV Limited | Information & communication | 2021 |
| Rolleston 2 Solar Farm Limited | Energy | 2022 |
| Rolly International (UK) Limited | Information & communication | 2001 |
| Room 8 Films Ltd | Administrative & support | 2016 |
| Rose Alotaibi Ltd | Wholesale & retail | 2024 |
| Rose CA Ltd | Hospitality | 2022 |
| Roseacre (Banstead) Management Company Limited | Households | 2024 |
| Rosebank House Limited | Households | 2008 |
| Rosecroft Residents Limited | Households | 1986 |
| Rossby Consulting Limited | Professional & scientific | 2023 |
| Rossby Trading Limited | Administrative & support | 2025 |
| Rosslyn Close (Sunbury) Block 4 Limited | Households | 1994 |
| Rouge & Relic Ltd | Wholesale & retail | 2023 |
| Rowland Hawkes Motorcraft Centre Limited | Wholesale & retail | 2017 |
| Rownsmoss Limited | Real estate | 1974 |
| Roxburghe Hotel Edinburgh Opco Limited | Hospitality | 2018 |
| ROY Khan Consultancy Ltd | Real estate | 2025 |
| Royal Borough of Windsor and Maidenhead Horse Drawn Carriages Limited | Wholesale & retail | 2015 |
| Royal Windsor Taxis Limited | Transport & logistics | 2017 |
| Royard Capital Ltd | Extraterritorial | 2014 |
| Royard Investment Ltd | Extraterritorial | 2014 |
| Royard Ltd | Other services | 2014 |
| Royard Property Ltd | Extraterritorial | 2014 |
| Royazain Ltd | Real estate | 2021 |
| Royce Wellness Limited | Health & social care | 2024 |
| RPH Sembhi Properties Ltd | Real estate | 2024 |
| RPS Capital Limited | Real estate | 2025 |
| RSF Recordings Limited | Arts & recreation | 2012 |
| Rslfire UK Ltd | Public administration | 2025 |
| Ruby Ru's Limited | Other services | 2017 |
| Ruley Investments Limited | Real estate | 2018 |
| Rumraisin Limited | Manufacturing | 2009 |
| Runnymede Antiques Limited Partnership | | 1991 |
| Runnymede Residential Letting Services Limited | Real estate | 2001 |
| Russells House (Watford) Management Company Limited | Households | 1998 |
| Rutheruss Flat Management Company Limited | Households | 1978 |
| Rvss Company Ltd | Other services | 2016 |
| RWL Communications Ltd | Information & communication | 2002 |
| RWM Autos Limited | Wholesale & retail | 2024 |
| RWM Enterprise Limited | Wholesale & retail | 2024 |
| Rypples Ltd | Financial services | 2024 |
| RYS Consultancy Limited | Professional & scientific | 2014 |
| S & H Services Ltd | Administrative & support | 2024 |
| S & J Property Investments Limited | Real estate | 2003 |
| S and a Media Ltd | Professional & scientific | 2022 |
| S N Locums Ltd | Health & social care | 2016 |
| S Peacock Autobody Services Limited | Wholesale & retail | 2009 |
| S R Hobbs Limited | Transport & logistics | 2003 |
| S&J Security Solutions Ltd | Administrative & support | 2025 |
| S&R Real Estate Limited | Real estate | 2019 |
| S&S Beauty Lounge Ltd | Other services | 2024 |
| S&S Organisation Limited | Professional & scientific | 2019 |
| S.S Brand Consultants Ltd | Professional & scientific | 2025 |
| SA Design & Research Ltd | Professional & scientific | 2018 |
| SA Home Services Ltd | Construction | 2022 |
| SA3Y Consultants Limited | Health & social care | 2020 |
| Saad Chef Services Ltd | Hospitality | 2025 |
| Sabberton Landscapes Limited | Professional & scientific | 2019 |
| Sabi Star Group Ltd | Construction | 2021 |
| SABIR5 Consulting Limited | Administrative & support | 2013 |
| SABIR5 Properties Limited | Real estate | 2017 |
| Saca Consulting Limited | Professional & scientific | 2026 |
| Safa’S Properties Ltd | Households | 2025 |
| Safe Anaesthetic Partnership LLP | | 2013 |
| Safe Guard Securities Ltd. | Administrative & support | 2022 |
| Saffron Indian Kitchen Ltd | Hospitality | 2021 |
| Safo UK Limited | Information & communication | 2008 |
| Sahara I.T. Ltd | Information & communication | 2011 |
| Sahil Kakkar Asset Management Ltd | Financial services | 2019 |
| Said Consulting Ltd | Professional & scientific | 2026 |
| Saint George Circus Limited | Hospitality | 2020 |
| Salamandra Design & Digital Ltd | Information & communication | 2014 |
| Salento Planning Limited | Professional & scientific | 2011 |
| Sales Accelerator Consultancy Ltd | Information & communication | 2017 |
| Sallquin Estates Limited | Households | 2024 |
| Salt Diversity CIC | Information & communication | 2022 |
| Salt Film Limited | Information & communication | 2001 |
| Saltysea Heston Limited | Hospitality | 2015 |
| Salutem ED Bidco Limited | Health & social care | 2017 |
| Salutem LD Acer Debtco I Limited | Health & social care | 2022 |
| Salutem LD Acer Debtco II Limited | Health & social care | 2022 |
| Salutem LD Bidco II Limited | Health & social care | 2017 |
| Salutem LD Bidco III Limited | Health & social care | 2017 |
| Salutem LD Bidco IV Limited | Health & social care | 2017 |