| R & P Electrical Contractors Limited | Construction | 1998 |
| R a Brock Ltd | Administrative & support | 2013 |
| R E Butler Construction and Development Limited | Construction | 2015 |
| R E Butler Consulting Limited | Professional & scientific | 2014 |
| R G Brock Ltd | Administrative & support | 2013 |
| R M a Services Limited | Professional & scientific | 2003 |
| R S Shell UK Limited | Construction | 2026 |
| R Van Haaren & Sons Limited | Real estate | 1961 |
| R. Edwards (Fire Appliances) Limited | Other services | 1992 |
| R.E. Butler & SON Limited | Real estate | 1997 |
| Rainbow Rural Centre (GT Dunmow) C.I.C. | Education | 2010 |
| Raised Panelling Limited | Manufacturing | 2025 |
| Raktrain Limited | Real estate | 2009 |
| Rapture Limited | Information & communication | 2012 |
| RAW Steel Choppers Ltd | Manufacturing | 2018 |
| Rawmoon Limited | Professional & scientific | 2013 |
| RB Food Certification Consulting Ltd | Hospitality | 2022 |
| Reach Property Development Ltd | Real estate | 2024 |
| Reach Technologies Ltd | Information & communication | 2025 |
| Real Playaz Limited | Arts & recreation | 2002 |
| Realmone Technologies Limited | Administrative & support | 2024 |
| Rebecca Poulter Recruitment Limited | Administrative & support | 2015 |
| Rebellion Creative Solutions Limited | Professional & scientific | 2024 |
| Rectory Groundworks Limited | Construction | 2011 |
| Red Pepper Communications Limited | Professional & scientific | 2006 |
| Redmore Digital Ltd | Information & communication | 2025 |
| Reed Contracts Limited | Construction | 1997 |
| Reefdale Consultants Limited | Professional & scientific | 1988 |
| Reformer Fitness Limited | Arts & recreation | 2023 |
| Regional & City (Investments) Limited | Construction | 1997 |
| Rekindle Aesthetics Essex Limited | Other services | 2021 |
| Relabond Limited | Construction | 1970 |
| Remedyate Ltd | Manufacturing | 2025 |
| Remember ME Always Ltd | Manufacturing | 2022 |
| Remington Estates Ltd | Real estate | 2021 |
| Renovate Right Ltd | Construction | 2018 |
| Resolute Contracts Limited | Professional & scientific | 2017 |
| Restaurant Furniture Store Ltd | Wholesale & retail | 2023 |
| Retro Shop Essex Limited | Wholesale & retail | 2025 |
| Revolution Recycling Ltd | Water & waste | 2024 |
| Reynolds (Friars Grange) Limited | Agriculture & fishing | 1974 |
| Rheanna's Boutique Limited | Wholesale & retail | 2025 |
| Richard & Angela Brock Ltd | Administrative & support | 2013 |
| Richard East Management Limited | Professional & scientific | 1991 |
| Richard Ellis Vehicle Services Limited | Wholesale & retail | 2008 |
| Richard Howell Carpentry Limited | Construction | 2019 |
| Rick's Shed Company Limited | Wholesale & retail | 2003 |
| Ridgell & Co Limited | Professional & scientific | 2002 |
| Right Balance Limited | Professional & scientific | 2025 |
| Rigley Brothers Contracting Limited | Construction | 2024 |
| Rigtally Limited | Professional & scientific | 2016 |
| RIO Rainz Limited | Information & communication | 2022 |
| RIO Rainz Music Limited | Information & communication | 2022 |
| Rising DOE Limited | Information & communication | 2023 |
| Riverside Books Limited | Wholesale & retail | 2001 |
| RJK Trading Ltd | Wholesale & retail | 2024 |
| Rjnm Electrical Ltd | Construction | 2022 |
| RM Waste Management Limited | Water & waste | 2011 |
| RME East Anglia Veterinary Services Ltd | Professional & scientific | 2025 |
| Rnsi Consulting Limited | Professional & scientific | 2017 |
| Roamanest Ltd | Information & communication | 2025 |
| Robbee Limited | Financial services | 2014 |
| Robert Hardman Limited | Arts & recreation | 2007 |
| Roberts Business Services Ltd | Information & communication | 2019 |
| Rochebrune Capital Limited | Financial services | 2014 |
| Rocking Horse London Limited | Wholesale & retail | 2023 |
| Rocsure Solutions Ltd | Information & communication | 2025 |
| Roding Valley Farming Limited | Agriculture & fishing | 2005 |
| ROM Theatre Arts Academy | Education | 2015 |
| ROM Theatre Arts School | Education | 2019 |
| Romlas Services Limited | Other services | 2014 |
| Rooftec Roofing Contractors Limited | Construction | 2019 |
| Roomz.Space Limited | Real estate | 2025 |
| Roos Lupus Ltd | Real estate | 2021 |
| Rosas Property Limited | Professional & scientific | 2015 |
| Rose and Crown (Stoke Newington) Limited | Hospitality | 2009 |
| Rosewell Windows & Doors Ltd | Construction | 2020 |
| Rosie Accounting Limited | Professional & scientific | 2021 |
| Rothwells Heating Limited | Construction | 2019 |
| Roundhouse Properties (London) Limited | Real estate | 2004 |
| Roundswell Services Limited | Wholesale & retail | 2003 |
| ROY W. Blackwell Limited | Construction | 1973 |
| Royall Cleaning Limited | Administrative & support | 2023 |
| Roze Products Ltd | Wholesale & retail | 2025 |
| RPS Digital and Media Ltd | Information & communication | 2022 |
| RS Courier Company Ltd | Transport & logistics | 2009 |
| RS Skin Ltd | Other services | 2025 |
| RSM Driver Training Limited | Education | 2014 |
| RSM Vehicle Assets Limited | Transport & logistics | 2014 |
| RTG Finishing Limited | Construction | 2014 |
| RTG Safety Limited | Professional & scientific | 2023 |
| Rubicon Communication Solutions Limited | Information & communication | 2009 |
| Rubrook Safety Consultants Ltd | Administrative & support | 2024 |
| Ruby Homes Essex Ltd | Real estate | 2024 |
| Rulten Johns Limited | Construction | 2010 |
| Rusdene Services Limited | Wholesale & retail | 1986 |
| Russell Brock Ltd | Administrative & support | 2013 |
| Ruth Essex Limited | Information & communication | 2019 |
| Rutherford Electrical Design Limited | Construction | 2017 |
| Rutland Financial Ltd | Financial services | 2011 |