| Rainbow House Advisers Limited | Professional & scientific | 2016 |
| Ralm Group Holdings Ltd | Financial services | 2023 |
| Ramah Health Care Ltd | Health & social care | 2016 |
| Ramsden Mills Commercial Limited | Administrative & support | 2018 |
| Random & Light Digital Ltd | Professional & scientific | 2025 |
| Rare Fitness Ltd | Arts & recreation | 2018 |
| Rascals Theatre School Limited | Arts & recreation | 2000 |
| Ratcliff Farms LP | | 2025 |
| Raven Compliance Ltd | Professional & scientific | 2019 |
| Ravenkrieger Ltd | Wholesale & retail | 2024 |
| Rawapple Communications Limited | Information & communication | 2006 |
| Raymonds Pantry Ltd | Wholesale & retail | 2024 |
| Rayne Automotive Limited | Manufacturing | 2013 |
| Rayne Valley Developments Ltd | Real estate | 2024 |
| RB Design (Essex) Limited | Construction | 2013 |
| RB Executive Recruitment Limited | Administrative & support | 2025 |
| RB Investment Consulting Limited | Professional & scientific | 2019 |
| RBL Electrical and Building Limited | Construction | 2026 |
| RBM Construction Consultants Ltd | Professional & scientific | 2025 |
| RDN Ltd | Wholesale & retail | 2006 |
| RDP Creative Limited | Other services | 2007 |
| RDS Fire and Security Ltd | Construction | 2012 |
| RDS Group Holdings Ltd | Real estate | 2025 |
| RDS Pipeline Isolation Ltd | Construction | 2012 |
| RE SPV1 Ltd | Real estate | 2026 |
| Reach Health and Performance Limited | Health & social care | 2013 |
| React 2 IT (Building Refurbishment) Limited | Construction | 2011 |
| Ready SET Skim Limited | Construction | 2025 |
| Readyvalue Limited | Manufacturing | 1998 |
| Real 77 Limited | Wholesale & retail | 2014 |
| Real Evoo Ltd | Wholesale & retail | 2026 |
| REAL8 Ltd | Professional & scientific | 2017 |
| Realmist Construction Ltd | Construction | 2015 |
| Rebel Palm Ltd | Wholesale & retail | 2026 |
| Recoverable Limited | Wholesale & retail | 2020 |
| Recruitmentsavvy Limited | Administrative & support | 2025 |
| Red 100 Limited | Construction | 2004 |
| Red Arch Letting Ltd | Real estate | 2017 |
| Red Arch Property Ltd | Real estate | 2017 |
| Red Cactus Solutions Limited | Professional & scientific | 2012 |
| Red Clay Media Limited | Information & communication | 2009 |
| Redd Wealth Management Limited | Professional & scientific | 2021 |
| Redfern Business & Education Ltd | Professional & scientific | 2023 |
| Rediscover Ltd | Administrative & support | 2018 |
| Redline (Sound Solutions) Limited | Extraterritorial | 2008 |
| Redmore Brown Limited | Professional & scientific | 2007 |
| Redpoint PM Limited | Real estate | 2008 |
| Regency Guarding & Events Limited | Other services | 2005 |
| Regency Guarding Limited | Administrative & support | 2025 |
| Regency Security Group Limited | Administrative & support | 2009 |
| Regency Security Management Services Ltd | Administrative & support | 2016 |
| Regency Security Services (UK) Limited | Administrative & support | 2010 |
| Regency Training UK Limited | Education | 2024 |
| Regtech.Design Ltd | Information & communication | 2025 |
| Rejuvenate Cleaning Ltd | Administrative & support | 2024 |
| Relf Limited | Arts & recreation | 2023 |
| Relker Ltd | Financial services | 2024 |
| Relliscents Ltd | Wholesale & retail | 2024 |
| Rent and Buy Your Car Ltd | Financial services | 2020 |
| Repair, Installation, Service of Elevators Ltd | Manufacturing | 2018 |
| Repairs Install Services of Elevators UK Ltd | Manufacturing | 2026 |
| Repton 1793 Limited | Construction | 2009 |
| Revolution Attire Ltd | Wholesale & retail | 2025 |
| Rfdl Limited | Administrative & support | 2016 |
| RFI Shielding Limited | Manufacturing | 2015 |
| Rhino Branding Solutions Ltd | Manufacturing | 2025 |
| Rich Coaching and Consulting Ltd | Professional & scientific | 2026 |
| Rich Property Investment Ltd | Real estate | 2023 |
| Richard Overall Limited | Information & communication | 2009 |
| Richard Vest Architectural Design Ltd | Professional & scientific | 2011 |
| Ricksu Limited | Other services | 2003 |
| Ricky Jewitt Carpets Ltd | Wholesale & retail | 2015 |
| Rider Comms Limited | Information & communication | 1997 |
| Ridima Ltd | Health & social care | 2012 |
| RIG Systems Engineering Ltd | Professional & scientific | 2011 |
| Riggin Marvellous Limited | Arts & recreation | 2004 |
| Riley Metal Works Limited | Manufacturing | 2001 |
| Rioforce Limited | Administrative & support | 2023 |
| Risdons Butchers Limited | Wholesale & retail | 2025 |
| Rise 2 Fame Management Agency Ltd | Professional & scientific | 2025 |
| Rising Edge Ltd | Financial services | 2014 |
| Rita 4 Rent Limited | Professional & scientific | 2022 |
| Rita Holdings Limited | Professional & scientific | 2013 |
| Riverside Land & Property Developments Ltd | Real estate | 2025 |
| Riverside Management Company (Hoddesdon) Limited | Households | 2007 |
| Riverside Rentals Limited | Real estate | 2025 |
| Rivicia Limited | Health & social care | 2018 |
| Rixol Limited | Administrative & support | 2023 |
| RJ Waddell Properties Limited | Construction | 2022 |
| RJH Fleet Maintenance Ltd | Other services | 2023 |
| RJR ALI & Steel Installations Limited | Other services | 2021 |
| RJR Installation Solutions Ltd | Construction | 2025 |
| RJR Motorcycles Limited | Wholesale & retail | 2019 |
| RJW Accounts Ltd | Professional & scientific | 2025 |
| RJW Bars Ltd | Hospitality | 2024 |
| RMC Farm & Plant Ltd | Wholesale & retail | 2019 |
| Roberts TEY Developments Limited | Extraterritorial | 2014 |
| Robertsons Heating Limited | Construction | 2023 |
| Rockchart Limited | Manufacturing | 1997 |
| Rocket Psyence Limited | Professional & scientific | 2000 |