| Rebecca Jacqueline Aesthetics Limited | Health & social care | 2017 |
| Rebecca Morgans Limited | Professional & scientific | 2025 |
| Rebecca Munroe Studios Ltd | Information & communication | 2023 |
| Recoleta Consulting Limited | Professional & scientific | 2016 |
| Recontech Ltd | Information & communication | 2012 |
| Record Games Ltd | Information & communication | 2022 |
| Recruitment Services Limited | Administrative & support | 1987 |
| Red Berry Photos Ltd | Professional & scientific | 2024 |
| Red Films Limited | Information & communication | 2008 |
| Red FOX Forestry Ltd | Agriculture & fishing | 2025 |
| Red FOX Land Management Ltd | Agriculture & fishing | 2026 |
| Red Incorporated Limited | Wholesale & retail | 2008 |
| Red Kite Diagnostics Limited | Information & communication | 2025 |
| Red Nomad Studios Ltd | Information & communication | 2014 |
| Red Pebble Design Limited | Arts & recreation | 2014 |
| Red River Solutions Limited | Manufacturing | 2004 |
| Red Rock Plant Sales Limited | Wholesale & retail | 2014 |
| Red Technology Ltd | Manufacturing | 2005 |
| Red Wood Properties Limited | Real estate | 1957 |
| Redeemer Worthing Ltd | Other services | 2003 |
| Redeye Homes Limited | Real estate | 2023 |
| Redrawr Limited | Wholesale & retail | 2014 |
| Redwood Media Ltd | Information & communication | 2019 |
| Reed Developments Limited | Real estate | 2025 |
| Reeko Homes Ltd | Real estate | 2022 |
| Reeve Hospitality 2016 Limited | Hospitality | 2016 |
| Reeve Structures Limited | Professional & scientific | 2025 |
| Refearly Ltd | Information & communication | 2026 |
| Refer-All Limited | Information & communication | 2009 |
| Refined Spaces Construction Ltd | Construction | 2026 |
| Reflex Pictures Limited | Information & communication | 2006 |
| Reform Architects Limited | Professional & scientific | 2014 |
| Refresh Personal Finance Ltd | Financial services | 2010 |
| Refsix Ltd | Information & communication | 2016 |
| Reganny Ltd | Real estate | 2025 |
| Regen Aspire Ltd | Information & communication | 2013 |
| Regenai Technologies Limited | Information & communication | 2025 |
| Regency Carpets Worthing Limited | Wholesale & retail | 2012 |
| Regency Court (Worthing) RTM Company Limited | Households | 2014 |
| Regenerativematrix Limited | Health & social care | 2019 |
| Registered RN Ltd | Health & social care | 2019 |
| Regulus Consulting Ltd | Financial services | 2005 |
| REHMEY2 Ltd | Construction | 2020 |
| Reid Films Ltd | Information & communication | 2026 |
| Reigate Developments Limited | Real estate | 2009 |
| Reimagine Architects Limited | Professional & scientific | 2023 |
| Reimagine Investor Communications Ltd | Professional & scientific | 2023 |
| Relentless Mechanical Services Ltd | Construction | 2024 |
| Reliance Automatics Company Limited | Professional & scientific | 1985 |
| Reliance Registered Building Inspectors Limited | Professional & scientific | 2023 |
| Reliant Clinical Services Ltd | Health & social care | 2019 |
| Relocation & Renovations Ltd | Real estate | 2021 |
| Renato DI Matteo Limited | Professional & scientific | 2021 |
| Renatus Trading Ltd | Wholesale & retail | 2025 |
| Rennoconsulting Ltd | Financial services | 2018 |
| Renopipe Technologies Limited | Water & waste | 2021 |
| RENOV8 Construction Ltd | Construction | 2021 |
| Rens Kitchen Catering Ltd | Hospitality | 2025 |
| Rent Domain Limited | Information & communication | 2011 |
| Rent-In-France Limited | Administrative & support | 2006 |
| Repairing for Gadgets Ltd | Manufacturing | 2017 |
| Repeat Recovery Ltd | Arts & recreation | 2026 |
| Replica Glassfibre Limited | Manufacturing | 2012 |
| Request Print Ltd | Manufacturing | 2008 |
| Requisite Consultancy & Services Ltd | Administrative & support | 2018 |
| Rescuemind Limited | Education | 2025 |
| Research Integrity Limited | Professional & scientific | 2006 |
| Residential Reversions Limited | Real estate | 2021 |
| Residual Income Ltd | Financial services | 2019 |
| Resilient Energy Ltd | Construction | 2022 |
| Resilire Consulting Ltd | Professional & scientific | 2025 |
| Resin Flow Driveways Ltd | Construction | 2024 |
| Resolution Camera Hire Limited | Administrative & support | 2019 |
| Resolve Health Ltd | Health & social care | 2023 |
| Respectable Communications Limited | Construction | 2025 |
| Resquip Limited | Manufacturing | 2008 |
| Restaurant Hospitality Limited | Hospitality | 2026 |
| Restaurante Andalucia Limited | Hospitality | 2010 |
| Restland Limited | Real estate | 1988 |
| Restored Time Ltd | Other services | 2010 |
| Retro by Ronnie Limited | Wholesale & retail | 2020 |
| Reva Group of Companies Ltd | Education | 2026 |
| Reveal Colour Ltd | Other services | 2022 |
| Revit Generation Ltd | Professional & scientific | 2024 |
| Revival Coaching Ltd | Other services | 2020 |
| Revive Marketing Management Ltd | Information & communication | 2023 |
| Revolution Heating Limited | Construction | 2024 |
| Revolution VFX Limited | Information & communication | 2013 |
| REX Regent Ltd | Construction | 2026 |
| REY Food Group Limited | Hospitality | 2016 |
| REY LLP | | 2015 |
| REY Management LLP | | 2017 |
| REY SUB Limited | Hospitality | 2009 |
| RF Properties & Investments Limited | Real estate | 2018 |
| RFG Coaching and Training Limited | Education | 2020 |
| RFG Poole Limited | Hospitality | 2019 |
| RFG South Limited | Hospitality | 2022 |
| RFG Southampton Ltd | Hospitality | 2018 |
| RG Taverns Ltd | Real estate | 2006 |
| RH & B Investment Limited | Administrative & support | 2014 |