| Ricotti Sisters Limited | Education | 2024 |
| Rightside Kitchens Limited | Manufacturing | 2011 |
| Riis Property Ltd | Real estate | 2017 |
| Ringway Pool & Amusements Ltd | Arts & recreation | 2018 |
| Rinolf Foods Ltd | Hospitality | 2017 |
| RIO Leon Services Ltd | Information & communication | 2013 |
| Rio's Piri Piri Morden Ltd | Hospitality | 2024 |
| Riotous Studios Limited | Information & communication | 2025 |
| Riscon Advisors Limited | Information & communication | 2025 |
| Rison Investments Ltd | Real estate | 2017 |
| Rita Flowers Ltd | Wholesale & retail | 2023 |
| Riverside Building Ltd | Construction | 2022 |
| Riverside Court (Isleworth NO.2) Limited | Households | 2002 |
| Riverside Court (Isleworth) Limited | Households | 2002 |
| Riverside Pharmacy Limited | Wholesale & retail | 2004 |
| Rivets & Coats Limited | Manufacturing | 2018 |
| RJ Dwellings Limited | Real estate | 2025 |
| RK Autoworks Limited | Wholesale & retail | 2016 |
| RK Digital Consulting Ltd | Information & communication | 2026 |
| RK Tech Consulting Ltd | Information & communication | 2024 |
| RK2 Design & Build Ltd | Construction | 2025 |
| RK2 Developments Ltd | Real estate | 2022 |
| Rksg IT Consultancy Ltd | Information & communication | 2022 |
| RLB Cosmetics Limited | Wholesale & retail | 2026 |
| Rlf.Dev Ltd | Information & communication | 2023 |
| RLH Harb LLP | | 2026 |
| RM Footsteps Ltd | Real estate | 2022 |
| Rnjocas Ltd | Health & social care | 2012 |
| RO & Co Ltd | Real estate | 2012 |
| Robert Luff Foundation Limited | Health & social care | 1966 |
| Robert Steer & Company Limited | Other services | 2016 |
| Roberts Photography UK Ltd | Professional & scientific | 2021 |
| Robot-Coupe (UK) Limited | Wholesale & retail | 1978 |
| Roche Software Limited | Information & communication | 2015 |
| Rock N Rosa Limited | Other services | 2011 |
| Rodselia Events Ltd | Hospitality | 2025 |
| Rogerio Maciel Ltd | Transport & logistics | 2025 |
| Rolling Wave Consultancy Limited | Information & communication | 2010 |
| Roman Arch Construction Ltd | Construction | 2013 |
| RON Technology Ltd | Other services | 2025 |
| Ronsat Consultancy Ltd | Professional & scientific | 2023 |
| Rookie Rookie Limited | Information & communication | 2026 |
| Room and Roof Ltd | Real estate | 2019 |
| ROOM2TALK Therapies Limited | Other services | 2019 |
| Rooms & More Design Ltd | Construction | 2020 |
| Roosters Chicken Ltd | Hospitality | 2024 |
| Rootz Ltd | Real estate | 2026 |
| Rosbotham Dermatology Services Limited | Health & social care | 2020 |
| Rose Line Construction Limited | Construction | 2012 |
| Rose Line Properties Ltd | Construction | 2022 |
| Rowles Residential Limited | Households | 2015 |
| Royaal Palace Shawarma Acton Ltd | Hospitality | 2025 |
| Rprp Tech Limited | Information & communication | 2020 |
| RR Shepherd Motors Limited Limited | Wholesale & retail | 2025 |
| RS Peacock Properties Ltd | Real estate | 2022 |
| RS46 Construction Limited | Construction | 2013 |
| RSS Business Management Ltd | Other services | 2017 |
| RT Hitech Solutions Limited | Information & communication | 2025 |
| Rtrx Limited | Information & communication | 2023 |
| Rubicon Properties and Developments Limited | Real estate | 2023 |
| Rubik Development & Construction Consultancy Limited | Construction | 2025 |
| Ruhberry Kingston Limited | Wholesale & retail | 2025 |
| Ruislip Tyres and Auto Repairs Limited | Manufacturing | 2015 |
| Runflow Ltd | Wholesale & retail | 2026 |
| Running Red Limited | Information & communication | 2005 |
| Ruth Elizabeth Design Limited | Professional & scientific | 2011 |
| Ruthless Limited | Administrative & support | 2020 |
| Ruthless Market Research Limited | Information & communication | 2019 |
| Ruya Foods Ltd | Hospitality | 2022 |
| Ry-Design Ltd | Professional & scientific | 2026 |
| Rykhlevy Limited | Construction | 2024 |
| S & H Auto Repairs Ltd | Wholesale & retail | 2021 |
| S Bayezidi Medical Limited | Health & social care | 2019 |
| S Chopra QA Associates Limited | Information & communication | 2012 |
| S E Quality Services Limited | Other services | 2018 |
| S Jaggi Ltd | Real estate | 2023 |
| S Knight Services Ltd | Construction | 2025 |
| S Kumar Construction Ltd | Administrative & support | 2025 |
| S&B Properties London Limited | Real estate | 2017 |
| S&M Build London Ltd | Construction | 2025 |
| S&S Enterprises 2020 Ltd | Real estate | 2020 |
| S&S Law Ltd | Professional & scientific | 2017 |
| S. P. Sharkey Consulting Limited | Professional & scientific | 2019 |
| S3 Consulting Engineers Ltd | Professional & scientific | 2020 |
| S3 Property Management Ltd | Professional & scientific | 2023 |
| S98 Consulting Services Ltd | Information & communication | 2025 |
| SA Project Services Ltd | Professional & scientific | 2026 |
| SAA Consulting Services Ltd | Health & social care | 2023 |
| Saanvika Homes Limited | Real estate | 2022 |
| Saanvika Solutions Ltd | Information & communication | 2017 |
| Saay Limited | Construction | 2016 |
| Saba 2017 Ltd | Administrative & support | 2017 |
| Sabir Khan 25 Limited | Real estate | 2022 |
| Sachdev Brothers Ltd | Real estate | 2021 |
| Sachin Patel Limited | Professional & scientific | 2017 |
| Sachleen Properties Sourcing Ltd | Real estate | 2025 |
| Safer Business Hounslow Ltd | Extraterritorial | 2021 |
| Safety Traffic Management Ltd | Transport & logistics | 2025 |
| Saga IT Solutions Ltd | Information & communication | 2018 |
| Saha Medics Limited | Health & social care | 2011 |