| Resource @ Production Support Limited | Manufacturing | 2019 |
| Rest Assured Healthcare Ltd | Health & social care | 2025 |
| Rest Assured Homecare (UK) Ltd | Health & social care | 2019 |
| Retrac Developments Limited | Administrative & support | 2020 |
| Retrac Investment Properties Limited | Administrative & support | 2020 |
| Revillo Ltd | Wholesale & retail | 2020 |
| Revstone Property Ltd | Real estate | 2026 |
| REW Norfolk Limited | Real estate | 2016 |
| Rewday Ltd | Construction | 2025 |
| REX Bene Holdings Ltd | Financial services | 2025 |
| Reynard ROW (Downham Market) Management Company Limited | Households | 2021 |
| Rges International Limited | Manufacturing | 2009 |
| RGR Developments Limited | Construction | 2015 |
| RGT Parker Ltd | Construction | 2021 |
| RH Medical Partnership Ltd | Health & social care | 2018 |
| Rhema Chapel International Churches, King's Lynn | Other services | 2024 |
| Rhod Davies Limited | Information & communication | 2006 |
| Riatsala Consulting Limited | Professional & scientific | 2023 |
| Rich Carpets Limited | Other services | 2010 |
| Richard Beeby Industrial Contracting Limited | Construction | 2007 |
| Richard Morrish Associates Limited | Professional & scientific | 2003 |
| Richard Woolford Consulting Limited | Administrative & support | 2017 |
| Richardsons Hardware Ltd | Wholesale & retail | 2025 |
| Ricluce Ltd | Hospitality | 2020 |
| Riding With Robbie Ltd | Professional & scientific | 2023 |
| Rimrad Limited | Health & social care | 2020 |
| Rimvis Ltd | Transport & logistics | 2015 |
| Ringwood & Simpson Limited | Administrative & support | 2022 |
| Ringwood Lettings LLP | | 2019 |
| Riptide Cleaning Company Ltd | Administrative & support | 2024 |
| Rise Scaffold Services Limited | Construction | 2008 |
| Ristohn Nham Ltd | Wholesale & retail | 2025 |
| Ritual Origins Ltd | Arts & recreation | 2025 |
| River Services (TMB) Ltd | Transport & logistics | 2025 |
| Riverside Renewables AD Limited | Energy | 2023 |
| Riverview Flat Management Limited | Households | 2013 |
| Rivmedia Ltd | Information & communication | 2018 |
| Rivoli Trading Limited | Wholesale & retail | 2008 |
| RIX Accountancy Limited | Professional & scientific | 2003 |
| RIX New Properties Ltd | Construction | 2026 |
| RJ Global Management Ltd | Professional & scientific | 2025 |
| RJC Nexus Ltd | Administrative & support | 2026 |
| Rjplancaster Technology Ltd | Information & communication | 2022 |
| RJS Drive Limited | Transport & logistics | 2017 |
| RK2 Rums and Bars Ltd | Wholesale & retail | 2020 |
| RKB Carpentry & Locksmiths Ltd | Construction | 2023 |
| RKB Hardware Ltd | Wholesale & retail | 2026 |
| RLS Supplies Limited | Wholesale & retail | 2010 |
| RLS Utilities Ltd | Professional & scientific | 2025 |
| RLW Trading Ltd | Wholesale & retail | 2024 |
| RMS Timber Limited | Wholesale & retail | 2024 |
| Road & Rail Consultancy Services Limited | Professional & scientific | 2005 |
| Roadart Ltd | Administrative & support | 2007 |
| Roamcraft Leisure Ltd | Wholesale & retail | 2025 |
| Rob&Ert Ltd | Construction | 2023 |
| Robbins & Chapman Limited | Construction | 2004 |
| Robert Fencing Ltd | Administrative & support | 2015 |
| Robert Wise Ltd | Professional & scientific | 2009 |
| Roberts and Stalley Ltd | Financial services | 2025 |
| Robinia Court (Syderstone) Management Company Limited | Households | 2013 |
| Robinna Limited | Real estate | 2017 |
| Rocket Tips Ltd | Information & communication | 2025 |
| Rockleize Limited | Real estate | 2018 |
| Roffes Holdings Limited | Financial services | 2015 |
| Rogers Group Limited(The) | Construction | 1979 |
| Rogue Production Services Limited | Other services | 2005 |
| Roleplay Leisure Ltd | Arts & recreation | 2026 |
| Roman Bank Nurseries Ltd | Wholesale & retail | 2020 |
| Roman Drywall Ltd | Construction | 2024 |
| Roman Renovations Limited | Real estate | 2015 |
| Romco Investments Ltd | Real estate | 2012 |
| Roof Revive Ltd | Administrative & support | 2026 |
| Roofcorp Ltd | Construction | 2025 |
| Roos Law Ltd | Professional & scientific | 2021 |
| Roper's Amusements Ltd | Arts & recreation | 2020 |
| Rory Z Hypnosis Academy Ltd | Information & communication | 2020 |
| Rose Decorating Ltd | Construction | 2019 |
| Rosehill Business Solutions Ltd | Administrative & support | 2025 |
| Rosia Properties Limited | Real estate | 2013 |
| Rounce and Evans Property Management Limited | Real estate | 2003 |
| Routier Limited | Hospitality | 2013 |
| Rovbod Services Limited | Mining & quarrying | 2009 |
| Rowan Renovations Limited | Construction | 2024 |
| ROY Spigelman Ltd | Professional & scientific | 2020 |
| Royacare Agency Ltd | Administrative & support | 2008 |
| Royal West Norfolk Golf Club Limited | Arts & recreation | 2024 |
| Roydon Hall Farms Limited | Agriculture & fishing | 1995 |
| Roythorne & SON Ltd | Wholesale & retail | 2002 |
| Rozanna FOX Ltd | Construction | 2020 |
| RP Housing Limited | Real estate | 2019 |
| RPM Tech Ltd | Wholesale & retail | 2022 |
| RR Partners Ltd | Health & social care | 2025 |
| Rsgl Ltd | Wholesale & retail | 2025 |
| RSJ Print Ltd | Manufacturing | 2024 |
| Rtech (UK) Limited | Wholesale & retail | 2008 |
| Ruby Circle Coaching Limited | Education | 2020 |
| Ruby Circle Investments Limited | Financial services | 2017 |
| Ruby Circle Limited | Real estate | 2014 |
| Ruby Willow Accessories Ltd | Wholesale & retail | 2025 |
| Rudd Electrical Services Ltd | Construction | 2025 |