| Reece Livery LLP | | 2025 |
| Reed Medical Consultancy Ltd | Health & social care | 2020 |
| Reesolution Holdings Limited | Financial services | 2025 |
| Reforge Fitness Equipment Ltd | Manufacturing | 2023 |
| Reforge Security Systems Ltd | Manufacturing | 2026 |
| Refrigeration Disposal Services Ltd | Transport & logistics | 2021 |
| Refugi and Company Limited | Professional & scientific | 2018 |
| Reg's Kebabs Limited | Hospitality | 2014 |
| Reg-Ental Ltd | Real estate | 2026 |
| Regen Amenity Limited | Wholesale & retail | 2022 |
| Regen Construction Limited | Construction | 2022 |
| Regen Property Services Ltd | Construction | 2023 |
| Regency Park Homes Ltd | Manufacturing | 2017 |
| Regency Rose Property Services Limited | Construction | 2003 |
| Regeneras Limited | Energy | 2014 |
| Regeneration & Economic Development Limited | Professional & scientific | 2003 |
| Regis Recruitment Ltd | Administrative & support | 2002 |
| Rehmans Private Limited | Hospitality | 2024 |
| Rejuvenate YOU Ltd | Wholesale & retail | 2024 |
| Relatte Support Services Limited | Health & social care | 2024 |
| Reliance Autos Limited | Wholesale & retail | 2020 |
| Reliance Fire Limited | Public administration | 2015 |
| Reliance Hill Ltd | Information & communication | 2017 |
| Reliant BPO Ltd | Administrative & support | 2024 |
| Reliatec Holdings Limited | Professional & scientific | 2008 |
| Relife Healthcare Consultancy Ltd | Information & communication | 2022 |
| Remembrance Glass Limited | Extraterritorial | 2021 |
| Remiq Ltd | Transport & logistics | 2025 |
| Remote Camera Research Limited | Administrative & support | 2023 |
| Rena (Ponty) Ltd | Hospitality | 2017 |
| Renaissance Partners Limited | Wholesale & retail | 2024 |
| Renewable Green Technology Ltd | Construction | 2024 |
| Renewable Temporary Power Ltd | Administrative & support | 2021 |
| Rennco Ltd | Construction | 2024 |
| Renodrain Limited | Administrative & support | 2022 |
| Rent-Right Properties (UK) Limited | Real estate | 1998 |
| Rentalink Ltd | Real estate | 2024 |
| Renteam Ltd | Real estate | 2023 |
| Renu Living Spaces Ltd | Real estate | 2023 |
| Repeat Theory Ltd | Wholesale & retail | 2026 |
| Reporting Limited | Professional & scientific | 2006 |
| Reports Limited | Professional & scientific | 2006 |
| Reposit World Ltd | Professional & scientific | 2024 |
| Requiem Tattoo Shropshire Ltd | Other services | 2024 |
| Reseiclo Community Wood Recycling | Water & waste | 2007 |
| Reselan Limited | Professional & scientific | 2020 |
| Resell.All Limited | Wholesale & retail | 2022 |
| Reservie Ltd | Information & communication | 2023 |
| Residents of Frances House Bembridge Limited | Households | 1981 |
| Residents of Woodland House Shanklin Limited | Hospitality | 1974 |
| Resin Rich Ltd | Manufacturing | 2026 |
| Resource Business Services Ltd | Administrative & support | 2023 |
| Resource Traffic Solutions Limited | Construction | 2018 |
| Respisafe (UK) Limited | Administrative & support | 2006 |
| Responsable Assistance Limited | Health & social care | 2022 |
| Response Support Limited | Professional & scientific | 2010 |
| Result Plan Ltd | Hospitality | 2017 |
| Resultery Projects Cymru Ltd | Hospitality | 2022 |
| Retro & Vintage Catering Conversions Ltd | Wholesale & retail | 2018 |
| Retro Central Limited | Wholesale & retail | 2025 |
| Retro Surveys Limited | Construction | 2024 |
| Retro Vintage Store Ltd | Wholesale & retail | 2018 |
| Retronewport Ltd | Hospitality | 2020 |
| Return to Education College Ltd | Education | 2025 |
| Reuben Wheatle International Ltd | Administrative & support | 2020 |
| Reverse Poco Limited | Information & communication | 2019 |
| Review BEE Limited | Information & communication | 2024 |
| Revisio Marine Control Ltd | Transport & logistics | 2022 |
| Revitalise Motion Limited | Extraterritorial | 2024 |
| Revive Academy Limited | Education | 2023 |
| Revive Development Consultants Ltd | Professional & scientific | 2023 |
| Revive Esthetics Limited | Other services | 2026 |
| Revive Newport | Health & social care | 2011 |
| Revolution MOT Limited | Wholesale & retail | 2020 |
| REW Valley Dairies (Retail) Limited | Wholesale & retail | 1985 |
| Rewear Group Ltd | Water & waste | 2024 |
| Reworkshop Limited | Manufacturing | 2017 |
| REX House (Ventnor) Limited | Households | 2006 |
| Reynz Clearance Ltd | Transport & logistics | 2022 |
| RF2 Ltd | Hospitality | 2023 |
| RFJ Properties Ltd | Real estate | 2021 |
| RG Hearing Care Limited | Health & social care | 2012 |
| RG House Lights Ltd | Arts & recreation | 2024 |
| RG Medihealth Ltd | Wholesale & retail | 2025 |
| RG PTS Limited | Construction | 2016 |
| RGB Efficient Service Ltd | Transport & logistics | 2025 |
| RGD Windows Ltd | Wholesale & retail | 2022 |
| RGM Services (USK) Limited | Construction | 2013 |
| RGP Building Services Limited | Construction | 2020 |
| Rheinmetall Electronics UK Ltd | Professional & scientific | 1989 |
| Rhentu TAI Ltd | Real estate | 2024 |
| RHF Fencing Supplies Ltd | Wholesale & retail | 2021 |
| Rhianna Crisp Ltd | Professional & scientific | 2023 |
| Rhino Industrial Doors Ltd | Manufacturing | 2018 |
| Rhiwderin Inn Limited | Hospitality | 2002 |
| Rhosyn Care Ltd | Health & social care | 2022 |
| Rhsol Ltd | Professional & scientific | 2021 |
| RHY Properties Ltd | Construction | 2026 |
| RHY Services Ltd | Professional & scientific | 2024 |
| Rhys Webb Property Developments Limited | Real estate | 2016 |