| Regen Derma Ltd | Information & communication | 2025 |
| Regen MED Ltd | Information & communication | 2025 |
| Regenace Ltd | Information & communication | 2025 |
| Regenerative Medicine Ltd | Information & communication | 2025 |
| Regnolruf Court RTM Company Limited | Households | 2025 |
| Reigate Tailoring Ltd | Other services | 2025 |
| Reis Construction Ltd | Construction | 2018 |
| Relate IT Solutions Ltd | Professional & scientific | 2010 |
| Reliance Distributors Limited | Wholesale & retail | 2025 |
| Religion and Belief Plus Limited | Professional & scientific | 2025 |
| Relm Rental Limited | Real estate | 2025 |
| REM5811 Limited | Administrative & support | 2015 |
| Remas Services & Trading Company Ltd | Wholesale & retail | 2026 |
| Remindoo Limited | Information & communication | 2025 |
| Remnto Limited | Wholesale & retail | 2022 |
| Renato Pereira Ltd | Construction | 2015 |
| Renoir Consulting (UK) Limited | Professional & scientific | 1993 |
| Rent a Scoot Ltd | Administrative & support | 2018 |
| Rent in Stratford Limited | Households | 2022 |
| Renuterra Environmental Services Ltd | Water & waste | 2025 |
| Replex Global Ltd | Wholesale & retail | 2022 |
| Residential Equity Ltd | Real estate | 2020 |
| Residential Property Maintenance Ltd | Households | 2022 |
| Resource Hub (UK) Ltd | Professional & scientific | 2009 |
| Resourced Vintage Limited | Wholesale & retail | 2020 |
| Restall Seating Systems Limited | Manufacturing | 2005 |
| RETAIL24 Wimbledon Ltd | Wholesale & retail | 2014 |
| Rete Investment Properties Ltd | Real estate | 2019 |
| Rete Services Limited | Health & social care | 2012 |
| Reubranic Holdings Ltd | Households | 2025 |
| Reut Ltd | Construction | 2026 |
| Revealing Insights Ltd | Professional & scientific | 2024 |
| Revolutions Investment Limited | Real estate | 2020 |
| Rexcon Limited | Construction | 2024 |
| Rezonate Ltd | Information & communication | 2025 |
| Rezzoli Limited | Health & social care | 2011 |
| RF58 Ltd | Information & communication | 2025 |
| RFA Family Cafe Ltd | Hospitality | 2026 |
| RFA Trading Ltd | Transport & logistics | 2019 |
| RG Coding & Administration Ltd | Administrative & support | 2024 |
| RGM Foods Limited | Hospitality | 2017 |
| RGM Properties ( London ) Limited | Real estate | 2021 |
| Rhino Cable Services Limited | Construction | 2019 |
| Rhinomacs Marketing Ltd | Wholesale & retail | 2018 |
| RHO Capital a Ltd | Financial services | 2026 |
| RHO Capital Ltd | Real estate | 2023 |
| RHS Traders Ltd | Wholesale & retail | 2026 |
| Rhys Francis Wealth Management Limited | Financial services | 2014 |
| RHZ Trading Ltd | Construction | 2022 |
| Riaz Residential Ltd | Real estate | 2019 |
| Ribarova Accounting Services Limited | Professional & scientific | 2019 |
| Ribitt Ltd | Wholesale & retail | 2025 |
| Rich Coop Ltd | Other services | 2023 |
| Rich Property Solutions Ltd | Real estate | 2018 |
| Richard Hill Limited | Information & communication | 2011 |
| Richardson Thornton Heath Ltd | Wholesale & retail | 2018 |
| Riddle Bolden Ltd | Real estate | 2026 |
| Ride 4 YOU Ltd | Transport & logistics | 2017 |
| Rider Solutions Ltd | Education | 2011 |
| Riders Republic UK Limited | Manufacturing | 2025 |
| Rifo Limited | Real estate | 2014 |
| Right Holds Ltd | Financial services | 2025 |
| Right Medicare Limited | Health & social care | 2012 |
| Right on Recruitment Ltd | Administrative & support | 2009 |
| Rijus Limited | Administrative & support | 2024 |
| RIK Trading Ltd | Transport & logistics | 2022 |
| Ringhart (UK) Limited | Wholesale & retail | 1987 |
| Ringhart Holdings Limited | Professional & scientific | 2011 |
| Ringjali Limited | Real estate | 2020 |
| RIS UK Trading Ltd | Transport & logistics | 2025 |
| Riva Smart Homes Limited | Construction | 2021 |
| Rivendale Care Group Limited | Professional & scientific | 2008 |
| River Stone (UK) Limited | Health & social care | 2013 |
| River Stone Holds Ltd | Financial services | 2024 |
| River Stone Property Investment Ltd | Real estate | 2024 |
| River View (Putney) Limited | Wholesale & retail | 2011 |
| Riverbank Group Limited | Financial services | 2024 |
| Riverbank Property Investment Limited | Real estate | 2024 |
| Riverdale Developments Limited | Construction | 2004 |
| Riverside Cafe (Mitcham) Limited | Hospitality | 2016 |
| RIZ Shopnxt Limited | Wholesale & retail | 2025 |
| RK Cars UK Ltd | Transport & logistics | 2021 |
| RKR Management Ltd | Real estate | 2025 |
| RKS Food Distributors Ltd | Wholesale & retail | 2016 |
| RLW Solutions Limited | Information & communication | 2019 |
| RMA London Trading Ltd | Transport & logistics | 2017 |
| RMK Group Limited | Real estate | 2020 |
| RN Structures Ltd | Professional & scientific | 2023 |
| RN Trading London Ltd | Transport & logistics | 2024 |
| RNR Foods Ltd | Wholesale & retail | 2020 |
| Road Expertise Ltd | Administrative & support | 2021 |
| Road LUX Ltd | Construction | 2014 |
| Road LX Limited | Administrative & support | 2019 |
| ROAD2HOMEDRINKS Ltd | Wholesale & retail | 2024 |
| Roberto Tailoring Limited | Manufacturing | 2018 |
| Rob`S Mini Diggers Limited | Construction | 2008 |
| Rock Distribution Limited | Wholesale & retail | 2016 |
| Rocsoft Technology Ltd | Information & communication | 2024 |
| Roel Drylanning Ltd | Construction | 2019 |
| Rogare - the Fundraising Think Tank CIC | Information & communication | 2019 |