| Rayleigh Cold Store Limited | Hospitality | 1979 |
| Rayleigh Commercials Limited | Manufacturing | 2026 |
| Rayleigh Fencing Supplies Ltd | Wholesale & retail | 2023 |
| Raytone Limited | Real estate | 2009 |
| RBS Inland Waterways Club Limited | Arts & recreation | 2003 |
| RC Gironella Ltd | Health & social care | 2018 |
| Rccg - Heart of Worship Limited | Other services | 2026 |
| RCE Design & Build Ltd | Construction | 2015 |
| RCJ Logistics Ltd | Transport & logistics | 2024 |
| RD Property Assets Ltd | Real estate | 2025 |
| RDM Surveys Ltd | Professional & scientific | 2024 |
| RDS Associates Limited | Wholesale & retail | 1998 |
| RDT Fire&Security Ltd | Public administration | 2024 |
| Re-Move Strength and Conditioning Ltd | Health & social care | 2019 |
| Ready Cream Limited | Hospitality | 2018 |
| Real Action Ltd | Manufacturing | 2024 |
| Real People Ltd | Health & social care | 2013 |
| Reality Distortion Films Limited | Information & communication | 2024 |
| Realm Lush Limited | Wholesale & retail | 2024 |
| Realm Video Limited | Information & communication | 2016 |
| Rebecca Mackay Aesthetics Ltd | Education | 2023 |
| Rebellious Digital Limited | Professional & scientific | 2024 |
| Reclaim Supplies Ltd | Extraterritorial | 2015 |
| Rectory Services (Essex) Limited | Professional & scientific | 2021 |
| Red Balloon Web Ltd | Information & communication | 2020 |
| Red Dog PPC Limited | Professional & scientific | 2020 |
| Red Mortgage Advice Ltd | Financial services | 2015 |
| Red N White Vans Limited | Administrative & support | 2017 |
| Redstar Contracts Ltd | Construction | 2019 |
| Reed Property Services Ltd | Households | 2026 |
| Reeled in Ltd | Wholesale & retail | 2018 |
| Refined Inns Ltd | Hospitality | 2019 |
| Refined Performance LLP | | 2016 |
| Regal NET & Curtain Company Limited | Other services | 2010 |
| Regal Renovations Ltd | Construction | 2020 |
| Regatta Garden Furniture Limited | Wholesale & retail | 1992 |
| Rehmat Real Estate Ltd | Real estate | 2019 |
| Rehoboth Housing Group Limited | Real estate | 2026 |
| Reid & Sons Scaffolding Limited | Construction | 2024 |
| Reids Estates Limited | Real estate | 2026 |
| Reids Scaffolding Limited | Construction | 2022 |
| Reilly Property Group Ltd | Real estate | 2025 |
| Relentless Investment Holdings Limited | Financial services | 2025 |
| Relentless Strategies Ltd | Professional & scientific | 2024 |
| Relocruitment Limited | Administrative & support | 2019 |
| Relourah Associates Limited | Wholesale & retail | 2025 |
| Renny Limited | Wholesale & retail | 2020 |
| Reno Recordings Limited | Information & communication | 2020 |
| Renovate Group Ltd | Administrative & support | 2019 |
| Request IT Live Ltd | Information & communication | 2026 |
| RES Electrical Ltd | Construction | 2002 |
| Research Optics Ltd | Health & social care | 2024 |
| Resource Global Talent Ltd | Administrative & support | 2021 |
| Restaurant Maramont Ltd | Hospitality | 2025 |
| Restech Services Ltd | Public administration | 2022 |
| Restoration Care Limited | Health & social care | 2023 |
| Rexmont Ltd | Real estate | 2026 |
| Reynolds Industrial Cleaning & Services Limited | Administrative & support | 1993 |
| Rfpa Limited | Professional & scientific | 2016 |
| RGB (Commercial) Properties Ltd | Real estate | 2022 |
| RGB Maintenance Ltd | Construction | 2024 |
| Rgbb & Co. Limited | Real estate | 2026 |
| RGN Jones Limited | Wholesale & retail | 2025 |
| RIAN77 Holdings Limited | Real estate | 2022 |
| Richard Pugh Consultants Limited | Professional & scientific | 2020 |
| Richard Scott Motors Ltd | Wholesale & retail | 2015 |
| Richardson SO Ltd | Real estate | 2025 |
| Richies Touch Ltd | Health & social care | 2026 |
| Richmond Court (Benfleet) Freehold Limited | Households | 2014 |
| Richmond Pre-School C.I.C. | Education | 2010 |
| Ricketts & Laryea Properties Ltd | Real estate | 2026 |
| Ridgeway Groundworks and Landscaping Ltd | Construction | 2026 |
| Rishi Pharmacy Ltd | Wholesale & retail | 2004 |
| Risk Imperium Consulting Limited | Information & communication | 2017 |
| River Walk (Hewetts Quay) Management Co Limited | Households | 2002 |
| Riverside Garden Company Ltd | Wholesale & retail | 1998 |
| Riverwood Aquatics Limited | Wholesale & retail | 2019 |
| RJ Distributers Ltd | Wholesale & retail | 2025 |
| RJ Mortgages Limited | Financial services | 2021 |
| RJ Transport Ltd | Transport & logistics | 2024 |
| RJB Installations Limited | Construction | 2017 |
| RJB Spitalfields Ltd | Wholesale & retail | 2022 |
| RJC Accountancy & Tax Services Limited | Professional & scientific | 2024 |
| RJR Building Contractors Limited | Construction | 2019 |
| RK DRY Cleaning & Alterations Ltd | Other services | 2026 |
| RKJ Therapy and Psychology Service Ltd | Health & social care | 2024 |
| RKY Vivariums Ltd | Manufacturing | 2025 |
| RMC Fire Solutions Ltd | Information & communication | 2018 |
| RML Auto Services Limited | Wholesale & retail | 2012 |
| RMS Installations Essex Ltd | Construction | 2014 |
| Roam & Unwind Ltd | Real estate | 2026 |
| Roar Creativity Limited | Manufacturing | 2006 |
| ROB Lowe Tiling Ltd | Construction | 2022 |
| Robert Wood and Associates Limited | Professional & scientific | 2020 |
| Roberts and Campbell Property Solutions Ltd | Households | 2026 |
| Robotic Elites Limited | Administrative & support | 2025 |
| Robus Multi Academy Trust | Education | 2011 |
| Rocburn Limited | Wholesale & retail | 2009 |
| Rock IT Inflatables Limited | Arts & recreation | 2014 |
| Rock&Haul Ltd | Transport & logistics | 2025 |