| Regard Essentiel LLP | | 2022 |
| Regenart Ltd | Other services | 2025 |
| Rehab Basics Limited | Health & social care | 2016 |
| Reindorf Limited | Administrative & support | 2020 |
| Reliance Qualitas Ltd | Information & communication | 2015 |
| REM London Ltd | Information & communication | 2025 |
| Remay Limited | Information & communication | 2023 |
| Remote TV Ltd | Administrative & support | 2025 |
| Renaissance Learning UK Limited | Information & communication | 1998 |
| Renaissance UK Holdco Ltd. | Financial services | 2023 |
| Renault Retail Group UK Limited | Wholesale & retail | 1988 |
| Renewo Ltd | Construction | 2024 |
| Rennman International Limited | Administrative & support | 2021 |
| Repairspec Limited | Professional & scientific | 2018 |
| Reparo Ltd | Wholesale & retail | 2024 |
| Replylikeme Ltd | Information & communication | 2026 |
| Republica Hub | Other services | 2025 |
| Researchconnections Limited | Professional & scientific | 2016 |
| Residual Makers Limited | Other services | 2014 |
| Resolution Pro Ltd | Information & communication | 2019 |
| Resort Sales Ltd | Hospitality | 2019 |
| Ressonia Ltd | Information & communication | 2026 |
| Retail a to Z Limited | Wholesale & retail | 2015 |
| Retail Rucksack Ltd | Wholesale & retail | 2025 |
| Retail Trading Consultancy Limited | Administrative & support | 2013 |
| Retair Limited | Information & communication | 2018 |
| Retviem Ltd | Information & communication | 2026 |
| Reve EN Vert Limited | Wholesale & retail | 2012 |
| REX Construction Limited | Construction | 2012 |
| Rexdale Property Services Limited | Construction | 2022 |
| RHA Furniture Limited | Wholesale & retail | 2001 |
| RHA International Limited | Wholesale & retail | 1994 |
| Ribbons Consultants Limited | Professional & scientific | 2021 |
| Richings Real Estate Limited | Real estate | 2021 |
| Richmond Green Law Ltd | Real estate | 2022 |
| Richmond Papers Limited | Wholesale & retail | 2013 |
| Riders White Rose Limited | Hospitality | 2019 |
| Ridgebeach Limited | Real estate | 2004 |
| Ridgeway Home Rentals Limited | Real estate | 2025 |
| Right MAN for the JOB Ltd | Construction | 2012 |
| Rightin Limited | Administrative & support | 2014 |
| Ripplesoft Limited | Information & communication | 2022 |
| Rishik Infoplus Limited | Information & communication | 2015 |
| Rising Sun Capital Ltd | Real estate | 2017 |
| RL Serviceco Limited | Financial services | 2024 |
| Rlje Films Ltd | Information & communication | 2025 |
| Rmld Investments Limited | Real estate | 2018 |
| Rnsf Consulting Ltd | Professional & scientific | 2025 |
| Robert & Thomas Limited | Real estate | 2017 |
| Robert Miller Limited | Hospitality | 2015 |
| Robotics Holdings Limited | Professional & scientific | 2023 |
| Robus Applications Limited | Information & communication | 2018 |
| Rock Rome Ltd | Wholesale & retail | 2016 |
| Roggen Homes Ltd | Real estate | 2016 |
| Roimaxweb Ltd | Professional & scientific | 2020 |
| Ronaldosspago Catering Services Ltd | Hospitality | 2025 |
| Roni S Building Ltd | Construction | 2025 |
| Rooh Studio Ltd | Arts & recreation | 2025 |
| Rooster Investments Ltd | Financial services | 2023 |
| Rose Music Promotions Limited | Arts & recreation | 2003 |
| Rosegold Cleaning Services Ltd | Other services | 2018 |
| Roselliot Limited | Manufacturing | 2025 |
| Rottura Limited | Hospitality | 2021 |
| Roundsixmedia Ltd | Information & communication | 2025 |
| Roxana Tipu Limited | Health & social care | 2023 |
| ROY Rees Limited | Manufacturing | 2008 |
| RPS Law Limited | Professional & scientific | 2017 |
| RR Informatics Limited | Information & communication | 2014 |
| Rrmg Global Ltd | Health & social care | 2018 |
| RS DU Solutions Ltd | Construction | 2025 |
| RSC Propco Ltd | Real estate | 2021 |
| RSI London Limited | Administrative & support | 2018 |
| RT IT Ltd | Information & communication | 2018 |
| Rubbish to Go Services Ltd | Administrative & support | 2015 |
| Rudrasys Ltd | Information & communication | 2026 |
| Rudy Reece Ltd | Wholesale & retail | 2020 |
| Rugzworld Ltd | Wholesale & retail | 2025 |
| Rulia Cosmetics Ltd | Manufacturing | 2023 |
| Run Monster Run Ltd | Information & communication | 2025 |
| Runner Alerts Limited | Information & communication | 2024 |
| Runway Bioadvisory Limited | Professional & scientific | 2026 |
| Russell Group Solution Ltd | Construction | 2024 |
| RV Building Contractors Ltd | Construction | 2012 |
| RVM Projects Ltd | Construction | 2021 |
| RW Academic Research Ltd | Professional & scientific | 2014 |
| RZN52 Limited | Wholesale & retail | 2026 |
| S & T London Ventures Ltd | Other services | 2026 |
| S B M and Partners Trading Limited | Administrative & support | 2020 |
| S L Andrews Ltd | Professional & scientific | 2019 |
| S Soft Ltd | Administrative & support | 2022 |
| S&C Advisers Limited | Professional & scientific | 2018 |
| S&S Property Portfolio Management Limited | Real estate | 2021 |
| S-Kite Ltd | Information & communication | 2025 |
| S.& M.Stores Limited | Wholesale & retail | 1958 |
| S.Cleaners Limited | Administrative & support | 2016 |
| Saasworx Ltd | Information & communication | 2024 |
| Saatchi Ltd | Information & communication | 2021 |
| Sabanayeri Limited | Health & social care | 2026 |
| Sabs Property Ltd | Real estate | 2026 |
| Safe Publishing Ltd | Wholesale & retail | 2024 |