| R.M.B. Accountancy Limited | Professional & scientific | 2002 |
| R.M.P. Plastics Limited | Manufacturing | 1974 |
| R.Reilly Property Holdings Ltd | Hospitality | 2026 |
| R.S. Engineering Ltd | Construction | 2015 |
| R2AI Ltd | Information & communication | 2025 |
| RA Controls UK Limited | Wholesale & retail | 2013 |
| Rachel Poultney Limited | Professional & scientific | 2022 |
| Radio Direction Labs Ltd | Manufacturing | 2025 |
| Rafferty Property Holdings Limited | Professional & scientific | 2021 |
| Rafferty Property Limited | Real estate | 2024 |
| Rafferty Rowe Properties Ltd | Real estate | 2024 |
| Rahdirs Ltd | Construction | 2025 |
| Railco Limited | Administrative & support | 2018 |
| Rainbow Designs Holdings Limited | Financial services | 2021 |
| Rainbow Designs Limited | Wholesale & retail | 2005 |
| Rakseetha Limited | Wholesale & retail | 2023 |
| Raluc Limited | Public administration | 2021 |
| RAM Platinum Properties Limited | Real estate | 2023 |
| Rananiti Ltd | Professional & scientific | 2020 |
| Rare AS Limited | Wholesale & retail | 2026 |
| Rats KPC Composites Ltd | Professional & scientific | 2013 |
| Ratskov Construction Limited | Construction | 2025 |
| Raylynx Limited | Transport & logistics | 2012 |
| RCJ Automotive Ltd | Wholesale & retail | 2021 |
| RCJ Ltd | Wholesale & retail | 2023 |
| Rckts CT Ltd | Financial services | 2025 |
| Rcma Holdings Ltd | Financial services | 2025 |
| RD Projects Ltd | Construction | 2025 |
| Re-Joint Limited | Health & social care | 2025 |
| Readings Vehicle Services Ltd | Wholesale & retail | 2023 |
| Red Dust Comics Limited | Wholesale & retail | 2026 |
| Redfuzz Ltd | Information & communication | 2004 |
| Redit Hosting Limited | Information & communication | 2022 |
| Redron Limited | Education | 2014 |
| Reds Commercial Ltd | Hospitality | 2025 |
| Redwade Consultants Ltd | Professional & scientific | 2024 |
| Reehs Development Consultancy Limited | Administrative & support | 2014 |
| Refmatch Ltd | Information & communication | 2023 |
| Regale Microwave Ovens Limited | Wholesale & retail | 1983 |
| Regionstart Property Management Ltd | Households | 2004 |
| Reignite IB Ltd | Other services | 2024 |
| Relic Ltd | Manufacturing | 2004 |
| Renee Healthcare Services Ltd | Health & social care | 2021 |
| Renie Holdings Ltd | Other services | 2020 |
| Resolute Property Consultancy Limited | Administrative & support | 2009 |
| Reticom Ltd | Information & communication | 2005 |
| Retro South Ltd | Wholesale & retail | 2025 |
| RETRO92 Ltd | Wholesale & retail | 2023 |
| Reubens Rentals Ltd | Real estate | 2023 |
| REUBIN15 Limited | Administrative & support | 2019 |
| RF Marine Consultancy and Survey Limited | Professional & scientific | 2015 |
| RFE Legal Services Limited | Professional & scientific | 2024 |
| Rglg Property Limited | Real estate | 2024 |
| RGR GAS Services Ltd | Construction | 2022 |
| RHJ Solutions Limited | Education | 2004 |
| Rhodyhairuk Ltd | Other services | 2026 |
| Richard Gillon Limited | Professional & scientific | 2023 |
| Richard Martin Gallery Limited | Wholesale & retail | 2005 |
| Richard’S Construction Services Ltd | Construction | 2025 |
| Richmonds Property Services Limited | Real estate | 2006 |
| Ricroc Contracting Limited | Administrative & support | 2015 |
| Ride Tether Limited | Transport & logistics | 2025 |
| Ridgehall Ltd | Extraterritorial | 2010 |
| RIO and JET Ltd | Extraterritorial | 2005 |
| Rise Property Maintenance Ltd | Construction | 2025 |
| Rising Star Care Ltd | Public administration | 2025 |
| Riskrevo Ltd. | Information & communication | 2023 |
| Ritchie Tech Services Ltd | Professional & scientific | 2018 |
| Rixon Flooring Co. Limited | Wholesale & retail | 2025 |
| RJS Catering Limited | Hospitality | 2024 |
| RKJ Foods Ltd | Wholesale & retail | 2023 |
| RM Warehouse Services Ltd | Transport & logistics | 2019 |
| Rnsa Moorings Limited | Arts & recreation | 2019 |
| Road House VFX Limited | Information & communication | 2017 |
| Robert Peel International Limited | Education | 2015 |
| Robertson Boatbuilding Ltd | Manufacturing | 2005 |
| Robertson-Miles Property Management Ltd | Construction | 2024 |
| Robinson Driveways Limited | Construction | 2025 |
| Rock APE Engineering Ltd | Manufacturing | 2025 |
| Rogate Garage Limited | Extraterritorial | 2011 |
| Rogate Services Ltd. | Wholesale & retail | 2000 |
| Rollinson Property Limited | Real estate | 2025 |
| Rosagonzalez Ltd | Transport & logistics | 2022 |
| Rosams Property Services Ltd | Real estate | 2021 |
| Rosario's & Co (Southern) Limited | Hospitality | 2022 |
| Rose Wilde Wellbeing Limited | Health & social care | 2023 |
| Rosie's Little Blessings Nursery Limited | Education | 2015 |
| Ross Barrett Building and Carpentry Limited | Construction | 2021 |
| ROUTE67 Limited | Wholesale & retail | 2013 |
| Rowner Community Trust | Education | 1997 |
| Rowner Spice Ltd | Hospitality | 2021 |
| RPS Lettings Ltd | Real estate | 2018 |
| RSC Subsea Ltd | Professional & scientific | 2015 |
| RSE Electrical & Maintenance Limited | Manufacturing | 2010 |
| Rsge Ltd | Information & communication | 2014 |
| Rsquared Surveying & Consultancy Ltd | Professional & scientific | 2025 |
| Rubbish and Waste Clearance Portsmouth Ltd | Water & waste | 2021 |
| Rubix Commercials Ltd | Administrative & support | 2024 |
| Ruby Funerals Limited | Other services | 2009 |
| Ruby's Nails (PO) Limited | Other services | 2023 |