| Rozel Farrier Practice (IOW) Ltd | Agriculture & fishing | 2025 |
| Rozel Heat Distribution Ltd | Energy | 2016 |
| Rozoomio Ltd | Information & communication | 2025 |
| RP Enterprise Holdings Ltd | Financial services | 2022 |
| RP Heating Solutions Ltd | Construction | 2020 |
| RP Motorco Ltd | Wholesale & retail | 2024 |
| RP Singh Solicitors Limited | Professional & scientific | 2019 |
| RP Windows & Building Services Limited | Construction | 2004 |
| RPB Development Ltd | Real estate | 2026 |
| RPD Visual Ltd | Construction | 2025 |
| Rpdrv Limited | Construction | 2015 |
| RPI Estates Limited | Real estate | 2006 |
| RR Advisory Services Ltd | Professional & scientific | 2018 |
| RR Brickwork Ltd | Construction | 2025 |
| RR MEK Ltd | Wholesale & retail | 2024 |
| RRB Plumbing and Heating Ltd. | Administrative & support | 2018 |
| RRM Consultancy Limited | Information & communication | 2021 |
| RRR Retail Ltd | Wholesale & retail | 2022 |
| RRR Vasthava Properties Ltd | Real estate | 2025 |
| RS Capital Limited | Real estate | 2018 |
| RS Carpentry Services Ltd | Manufacturing | 2022 |
| RS Dryline and Plastering Limited | Construction | 2013 |
| RS Ice Ltd | Transport & logistics | 2020 |
| RS Industrial Solutions Ltd | Construction | 2025 |
| RS Living Ltd | Real estate | 2026 |
| RS Sahota Ltd | Real estate | 2023 |
| RS Soton Limited | Transport & logistics | 2018 |
| RS Vehicle Services (Southampton) Ltd | Wholesale & retail | 2014 |
| RS Web Hosts UK Ltd | Information & communication | 2018 |
| Rsainsbury Ltd | Other services | 2021 |
| Rsensing Ltd | Manufacturing | 2026 |
| Rsftm Ltd | Construction | 2024 |
| RSK Property Services Limited | Real estate | 2012 |
| RSM Concept Ltd | Manufacturing | 2023 |
| Rsma (Southampton) Limited | Financial services | 2018 |
| RSR Contractors Limited | Construction | 2014 |
| RSR Independent Limited | Wholesale & retail | 2016 |
| RSS Star Ltd | Wholesale & retail | 2019 |
| RT Consultants (U.K.) Ltd | Professional & scientific | 2022 |
| RT Little Brickwork Limited | Construction | 1997 |
| RTC Window Cleaners Limited | Administrative & support | 2020 |
| RTE Complex Care Solutions Limited | Health & social care | 2019 |
| RTS Carpentry Services Ltd | Manufacturing | 2021 |
| RTS Property Services South Ltd | Construction | 2024 |
| Ruba Enterprises Ltd | Wholesale & retail | 2017 |
| Rubani Trans Limited | Transport & logistics | 2026 |
| Rubber Cheese Limited | Professional & scientific | 2007 |
| Rubbish Clearance Limited | Water & waste | 2014 |
| Ruben&Roxy. Ltd | Transport & logistics | 2018 |
| Rubex Construction Ltd | Construction | 2025 |
| Ruby Cube Solutions Ltd | Administrative & support | 2025 |
| Ruby La’L Ltd | Professional & scientific | 2026 |
| Ruby Leisure Limited | Hospitality | 2012 |
| Ruby Mews Developments Limited | Real estate | 2015 |
| Rubyscollection Limited | Wholesale & retail | 2012 |
| Rubyz Cabaret Ltd | Arts & recreation | 2015 |
| Ruckoldt & Rylander Ltd | Information & communication | 2019 |
| Rudd Recruitment Ltd | Administrative & support | 2022 |
| Rudraya Ltd | Information & communication | 2025 |
| Ruelle Properties Limited | Construction | 2015 |
| Ruffs (EST.1904) Limited | Administrative & support | 2021 |
| Rufus (Totton) 1992 Management Limited | Households | 1992 |
| Rufus Lodge Ltd | Construction | 2022 |
| Ruhamah Consult Limited | Transport & logistics | 2025 |
| Ruilong (Southampton) Ltd | Hospitality | 2020 |
| Ruken 1 Limited | Hospitality | 2026 |
| Rule Commercial Finance Limited | Financial services | 2019 |
| Rulemark Advisory Ltd | Professional & scientific | 2026 |
| RUM of IT Ltd | Wholesale & retail | 2025 |
| Rumbridge Brown Ltd | Administrative & support | 2022 |
| Rumeli Consultancy Ltd | Hospitality | 2020 |
| Run Resourcing Ltd | Administrative & support | 2023 |
| Run Walk Sport Limited | Wholesale & retail | 2023 |
| Runaki Company for Construction and Mechanic Services Limited | Construction | 2024 |
| Runcamp Ltd. | Other services | 2015 |
| Runi Limited | Hospitality | 2024 |
| Running MAN Promotions Limited | Information & communication | 2013 |
| Running Mania Limited | Arts & recreation | 2017 |
| Runny Granny Ltd | Transport & logistics | 2020 |
| Rural Design Studio Ltd | Professional & scientific | 2013 |
| Ruscoz Developments Limited | Real estate | 2002 |
| Rusdale Studios Ltd | Information & communication | 2024 |
| Rusdene Group Limited | Financial services | 2018 |
| Rusdene Holdings Limited | Wholesale & retail | 1986 |
| Rush Solutions Limited | Professional & scientific | 2016 |
| Rushington Management 2006 Limited | Real estate | 2006 |
| Ruslat Ltd | Transport & logistics | 2016 |
| Russ Grant Services Limited | Manufacturing | 2010 |
| Russell (AS) Limited | Real estate | 2007 |
| Russell Allen Recruitment Limited | Administrative & support | 1999 |
| Russell Building & Property Services Ltd | Construction | 2014 |
| Russell Drainage Services Limited | Construction | 2006 |
| Russell-Mccurrach Hospitality Limited | Hospitality | 2025 |
| Russett House Management Company Limited | Households | 2023 |
| Russo's Cafe Ltd | Hospitality | 2025 |
| Russtec Contractors Ltd | Construction | 2009 |
| Rustell Commercial Limited | Real estate | 2025 |
| Rustell Extensions and Building Ltd | Construction | 2022 |
| Rustic Enterprises Ltd | Wholesale & retail | 2025 |
| Ruth Lynch Hair Extensions Limited | Other services | 2025 |