| Rosema Coffee Limited | Hospitality | 2017 |
| Rosemere Limited | Information & communication | 2007 |
| Rosemore Limited | Information & communication | 2020 |
| Rosh Virtuous Care Limited | Health & social care | 2015 |
| Rosie Monroe Ltd. | Construction | 2012 |
| Ross Byrne Coaching Limited | Arts & recreation | 2022 |
| Ross Labels Limited | Wholesale & retail | 2003 |
| Ross Manufacturing Limited | Manufacturing | 1988 |
| Ross Solicitors Limited | Professional & scientific | 2009 |
| Rossdale House Management Limited | Households | 2000 |
| Rossdhu Advisers Limited | Professional & scientific | 2025 |
| Rossisoft Ltd | Information & communication | 2014 |
| Rota DA Carne Ltd | Wholesale & retail | 2024 |
| Rotary Logistics (SW) Ltd | Transport & logistics | 2020 |
| Rotech (Swindon) Limited | Professional & scientific | 1985 |
| Rothwell Utilities Limited | Construction | 2018 |
| Rotor-Pro Ltd | Professional & scientific | 2019 |
| Roughmoor Village Fish & Chips Limited | Hospitality | 2018 |
| Routco Limited | Real estate | 2026 |
| Route 8 Barbers Limited | Other services | 2017 |
| Route One Consulting Ltd | Professional & scientific | 2016 |
| ROV Solutions Limited | Professional & scientific | 2014 |
| Roves Solar Farm Limited | Energy | 2014 |
| Rowan House (Swindon) Management Company Limited | Households | 2006 |
| Roxror Ltd | Professional & scientific | 2021 |
| ROY Care Services Ltd | Health & social care | 2019 |
| ROY Smart Limited | Professional & scientific | 2005 |
| Royal Wootton Bassett Electrical Limited | Construction | 2012 |
| Royall Plumbing Limited | Construction | 2023 |
| Royvara Ltd | Wholesale & retail | 2025 |
| RP Brands Ltd | Wholesale & retail | 2025 |
| RP Marketing Group Ltd | Wholesale & retail | 2026 |
| RP Transport & Logistics Ltd | Transport & logistics | 2020 |
| RPA Rapport Community Interest Company | Health & social care | 2019 |
| RPD Trimming & Fitting Ltd | Manufacturing | 2025 |
| Rpimc Ltd | Health & social care | 2018 |
| RPJ Productions Limited | Arts & recreation | 2025 |
| RPM Premium Motors Ltd | Wholesale & retail | 2022 |
| RPM Resources Ltd | Professional & scientific | 2023 |
| RR536 Limited | Hospitality | 2025 |
| RRB Accountants Swindon Ltd | Professional & scientific | 2021 |
| Rrecorde Ltd | Information & communication | 2007 |
| RRH Brands Limited | Professional & scientific | 2024 |
| RRR Appliance Repairs & Services Ltd | Other services | 2024 |
| RS Capital Homes Ltd | Real estate | 2025 |
| RS Electrical UK Limited | Manufacturing | 2004 |
| RS Infotech Solutions Limited | Information & communication | 2012 |
| RS Stonemasonry Ltd | Construction | 2017 |
| RS Workshop Ltd | Wholesale & retail | 2023 |
| RS2A Limited | Professional & scientific | 2008 |
| Rska Investment Property Ltd | Real estate | 2025 |
| RSL Holdings Limited | Professional & scientific | 2008 |
| Rspca North Wiltshire and Newbury District Trading Limited | Wholesale & retail | 2023 |
| Rtick Cooling Ltd | Energy | 2024 |
| RTS Fasteners Limited | Wholesale & retail | 2024 |
| RTV Consulting Limited | Professional & scientific | 2024 |
| Rubob Heating and Renewables Ltd | Construction | 2025 |
| Ruby Kitchens Ltd | Manufacturing | 2020 |
| Ruby Reign Events Private Ltd | Information & communication | 2025 |
| Ruby Turtle Solutions Limited | Information & communication | 2015 |
| Ruby's Nails & Spa Limited | Other services | 2019 |
| Rubys @ 32 Ltd | Hospitality | 2025 |
| Rubz G Limited | Health & social care | 2014 |
| Ruchi (Old Town) Limited | Hospitality | 2021 |
| Ruchi Swindon Ltd | Hospitality | 2020 |
| Ruck Paving Ltd | Construction | 2023 |
| Rudler Car Transportation & Storage Ltd | Transport & logistics | 2015 |
| Rudman Roofing Services Ltd | Construction | 2025 |
| Ruffnecks BJJ Ltd | Other services | 2022 |
| Rugbytots South Hampshire LLP | | 2017 |
| Rulen Limited | Construction | 2024 |
| Run Jump FLY Creations Ltd | Information & communication | 2022 |
| Run Swindon Limited | Wholesale & retail | 2011 |
| Run Wild Collective Ltd | Information & communication | 2018 |
| Runspire Ltd | Wholesale & retail | 2020 |
| Rupert Mark Homes Limited | Construction | 2014 |
| Rural Reviva CIC | Agriculture & fishing | 2025 |
| Rural Youth CIC | Education | 2025 |
| Ruscom Property Management Ltd | Hospitality | 2018 |
| Russell Laboratories Limited | Manufacturing | 2008 |
| Rusty Garage Brewpub Ltd | Manufacturing | 2019 |
| Rusty Monkey PH Ltd | Construction | 2026 |
| Rustys Speed Shop Limited | Wholesale & retail | 2025 |
| Ruth White Ltd | Public administration | 2018 |
| Ruzoi Investments Ltd | Real estate | 2026 |
| RV Logistics Swindon Limited | Transport & logistics | 2024 |
| RW Fork Lift Services Limited | Manufacturing | 2007 |
| RWB Gourmet Limited | Hospitality | 2025 |
| RWB IT Solutions Limited | Information & communication | 2018 |
| RWB Metals Ltd | Wholesale & retail | 2026 |
| RWB Taekwon-Do Ltd | Education | 2025 |
| Rwb(Taxis) Limited | Transport & logistics | 2024 |
| Rwbrfc Limited | Hospitality | 2013 |
| RWE Generation UK Holdings Limited | Professional & scientific | 2000 |
| RWE Generation UK PLC | Energy | 1999 |
| RWE Grangemouth Green Hydrogen Limited | Manufacturing | 2025 |
| RWE Ingen!Us Limited | Financial services | 2015 |
| RWE Markinch Limited | Energy | 2008 |
| RWE Principal Investments UK Limited | Professional & scientific | 2017 |
| RWE Renewables Gym 2 Limited | Financial services | 2010 |