| Rock and Rock Ltd | Real estate | 2021 |
| Rock of Peace Evangelical Ministry C&S Church (Apata Alafia) | Other services | 2022 |
| Rock the Frock Franchise Limited | Wholesale & retail | 2016 |
| Rocket Real Estate Limited | Real estate | 2007 |
| Rockface Consultancy Ltd | Professional & scientific | 2023 |
| Rockform Mechanical Ltd | Professional & scientific | 2020 |
| Rocksim Limited | Professional & scientific | 2012 |
| Rockwealth Chelmsford Ltd | Financial services | 2025 |
| Rocky Solutions Limited | Administrative & support | 2023 |
| Roding Garage Limited | Wholesale & retail | 2015 |
| Rodings Tax and Accounting Ltd | Professional & scientific | 2025 |
| Rodway Stephens Ltd | Construction | 2017 |
| Rogers and Rogers Services Limited | Wholesale & retail | 2019 |
| Rohan Medical Services Limited | Administrative & support | 2018 |
| Roka Nixy Ltd | Real estate | 2020 |
| Rokas IT Solutions Ltd | Information & communication | 2019 |
| Rollacity Holdings Limited | Financial services | 2016 |
| Rollacity Limited | Arts & recreation | 2010 |
| Rollacity Properties Limited | Construction | 2016 |
| Rollestone House Management Company Ltd | Households | 2023 |
| Rolling Stage Hire Ltd | Administrative & support | 2013 |
| Roman James Civils Ltd | Construction | 2024 |
| Romar Consulting Limited | Professional & scientific | 2019 |
| Romford and Ongar Investments Ltd | Real estate | 2023 |
| Romford Service Station Limited | Wholesale & retail | 2024 |
| Romy House Co Limited | Professional & scientific | 2016 |
| Ronald Charles Associates Limited | Other services | 2004 |
| Ronnie Crowe Limited | Wholesale & retail | 1990 |
| Ronnoco Building Services Limited | Manufacturing | 2010 |
| Rooda Communications Ltd | Professional & scientific | 2017 |
| Rooftop Solutions Ltd | Construction | 2022 |
| Rookery CAW Project Ltd | Construction | 2019 |
| Root and Remedy Wellness Limited | Health & social care | 2025 |
| Root to Branch Communications Ltd | Information & communication | 2014 |
| Roots and Liberty Limited | Wholesale & retail | 2023 |
| Roots Chelmsford CIC | Health & social care | 2024 |
| Rosarubra UK Limited | Wholesale & retail | 2020 |
| Rose Avenue Properties Limited | Real estate | 2024 |
| Rose Cottage Investments Limited | Real estate | 2019 |
| Rose Equity Limited | Financial services | 2015 |
| Rose Hill Luxury Gardens Limited | Construction | 2019 |
| Rose Merchants Ltd | Wholesale & retail | 2025 |
| Rose TM Ltd | Construction | 2024 |
| Rosebay Avenue Limited | Professional & scientific | 2021 |
| Roseberg Hospitality UK Limited | Professional & scientific | 2016 |
| Rosebery Independent Living Limited | Health & social care | 2020 |
| Rosebery Plumbers Limited | Construction | 2018 |
| Roseco Driving School Ltd | Education | 2020 |
| Rosemoor Consulting Limited | Administrative & support | 2016 |
| Rosetti Holdings Limited | Wholesale & retail | 2013 |
| Rosetti Limited | Wholesale & retail | 1936 |
| Rosewood (Northwood, Herne Bay) Residents Management Company Limited | Households | 2025 |
| Ross Elec Limited | Construction | 2006 |
| Rossi (Southend on Sea) Limited | Manufacturing | 2006 |
| Rossi (Western Esplanade) Limited | Hospitality | 2003 |
| Rostrade Limited | Wholesale & retail | 2021 |
| Rota 44 Logistics Ltd | Transport & logistics | 2023 |
| Roth Mechanical Services Limited | Construction | 2008 |
| Rotherfield Capital Limited | Financial services | 2026 |
| Rothers Limited | Information & communication | 2006 |
| Rothon Estates Ltd | Real estate | 2024 |
| Roti Mojo Ltd | Hospitality | 2022 |
| Roundtrip Limited | Administrative & support | 2014 |
| Rovira Ventures Limited | Professional & scientific | 2015 |
| Rowan Landscapes | | 2001 |
| Rowegan Ltd | Real estate | 2018 |
| Rowland K Limited | Health & social care | 2008 |
| Rowland Winn Limited | Wholesale & retail | 2012 |
| Roxbba Ltd | Administrative & support | 2024 |
| Roxwel PN Hand Car Wash Ltd | Wholesale & retail | 2026 |
| Roxwell Developments Limited | Construction | 2021 |
| Roxwell ROW Management Company Limited | Households | 2026 |
| ROY Terry Fireplaces Limited | Wholesale & retail | 2003 |
| Royal Diadem Ltd | Other services | 2024 |
| Royal Oak Drive Apartments Limited | Other services | 1979 |
| Royston Grab Hire Ltd | Construction | 2019 |
| RP Construction & Design Limited | Professional & scientific | 2014 |
| RP Construction Design & Build Ltd | Construction | 2013 |
| RP15 Properties Limited | Real estate | 2026 |
| RPD Engineering Limited | Administrative & support | 1998 |
| RPG Management Limited | Professional & scientific | 2024 |
| RPM Farming Limited | Agriculture & fishing | 2023 |
| RPR Holdings Limited | Financial services | 2021 |
| RPR Property Services LLP | | 2021 |
| RS Automotive Components Ltd | Wholesale & retail | 2024 |
| RS Design London Limited | Professional & scientific | 2022 |
| RS Fibrous Plaster Mouldings Ltd | Construction | 2023 |
| RS Integrated Solutions Ltd | Information & communication | 2026 |
| RS4 Limited | Health & social care | 2015 |
| Rscp Engineering & Consultancy Ltd | Real estate | 2015 |
| RSG Consulting Limited | Information & communication | 2003 |
| Rsir Properties Ltd | Real estate | 2023 |
| RSL Enterprises Limited | Professional & scientific | 2002 |
| RSS Nest Limited | Real estate | 2024 |
| RSW Homes Ltd | Real estate | 2024 |
| RT Advisory Solutions Limited | Administrative & support | 2020 |
| RT Automotive Engineering Ltd | Wholesale & retail | 2025 |
| RT Govey Investments Limited | Financial services | 2025 |
| RT PAN Asian Ltd | Hospitality | 2025 |
| RTB Construction & Maintenance Limited | Construction | 2026 |