| Reeflife Ltd | Paignton | 2025 |
| Reekie Renewables Limited | Arbroath | 2004 |
| Reel Nomads Ltd | Camberley | 2023 |
| Reel ROD Squad CIC | Nuneaton | 2024 |
| Reen Compost Limited | Co Armagh | 1989 |
| Reenafarm Organics TA the Soil MAN Ltd | Dungannon | 2014 |
| Rees Sport Horses Limited | Alresford | 2020 |
| Reeve Bros. (Farmers) Limited | East Halton | 1964 |
| Reeve Farms Limited | Princes Risborough | 1993 |
| Reeve Newfields Limited | Banbury | 1964 |
| Reeves Arboricultural Services Ltd | London | 2013 |
| Reeves Farm Bratton Limited | Chippenham | 2021 |
| Reeves Roots Ltd | London | 2023 |
| Reeves Tree Surgeons Limited | Stratford Upon Avon | 2005 |
| Reevesgate Farm Limited | Waltham Cross | 2021 |
| Refarmed Ltd | London | 2022 |
| Refco Farms Ltd | Durham | 2014 |
| Refine K9 Ltd | Wilmslow | 2025 |
| Reflex Agricultural Services Limited | Kent | 1984 |
| Reforest Scotland Ltd | Oban | 2024 |
| Reforest Trading Limited | Cambridge | 2019 |
| Refractive Space Ltd | London | 2024 |
| Regal Equestrian Ltd | Brentwood | 2007 |
| Regal Horse Limited | Steppingley | 2016 |
| Regal Pride Ltd | Nottingham | 2024 |
| Regalworld Limited | Bracknell | 2000 |
| Regen AG Solutions Ltd | Market Rasen | 2020 |
| Regen Forestry Limited | Gerrards Cross | 2019 |
| Regenera Farming Ltd | Newport Pagnell | 2025 |
| Regenerate OUR Green Space Ltd | Fortrose | 2023 |
| Regeneration Nation CIC | Sheffield | 2025 |
| Regeneration Services Limited | Winchester | 2004 |
| Regenerative Community Ltd | Oxted | 2023 |
| Regenerative Farms Limited | Southend On Sea | 2024 |
| Regenerative Food & Farming CIC | Penzance | 2020 |
| Regenerative Forestry Ltd | London | 2024 |
| Regenersoil Ltd | Eastbourne | 2021 |
| Regenevive Ltd | Harpenden | 2020 |
| Regenfarm Limited | Totnes | 2015 |
| Regenfutureco CIC | Manchester | 2021 |
| Regentwalk Limited | Banff | 2003 |
| Regional Tree Care Ltd | Burton-On-Trent | 2016 |
| Register of Mobility Scorers Limited | Penrith | 2022 |
| Regmata Enterprise Ltd | London | 2024 |
| Regrowth Tree Care Ltd | Chester Le Street | 2025 |
| Regulation Management Limited | London | 2011 |
| REH & LA Hayes Limited | Taunton | 2020 |
| Rehabilitation of Animals Rescued CIC | Plymouth | 2023 |
| Rehmat Foods Limited | London | 2024 |
| Reid Farming Ltd | Bromsgrove | 2026 |
| Reid Manor Farm Limited | London | 2024 |
| Reindeer Company Ltd. (the) | Inverness | 1952 |
| Reionise Ltd | London | 2022 |
| Reive Plant Ltd | Biggar | 2012 |
| Reksio K9 Care&Travel Limited | Luton | 2018 |
| Relax at Lakeside Limited | Stockport | 2025 |
| Relax Property Services Ltd | Manchester | 2019 |
| Releaf Tree Services Limited | Walton-On-Thames | 2020 |
| Reliable Transport Solutions Ltd | Londonderry | 2003 |
| Reliance Fishing Company Ltd. | Peterhead | 1999 |
| Relief Milkers.Co.Uk Limited | Coalville | 2009 |
| Relief Scanning Ltd | Chester | 2021 |
| Rellark Limited | Glasgow | 2024 |
| Relough Holsteins Ltd | Dungannon | 2010 |
| Relugas Farms Limited | Nr Forres | 1988 |
| Remediate Nature Limited | London | 2024 |
| Remephy Technologies Ltd | Harpenden | 2024 |
| Remkis Investments Limited | Stoke-On-Trent | 2009 |
| Remote Automation Ltd | Windermere | 2025 |
| Removeamber Limited | Pembroke | 1998 |
| Rems Contractors Ltd | Scarborough | 2025 |
| Remus Memorial Horse Sanctuary | Ingatestone | 2009 |
| REN Equestrian Limited | London | 2025 |
| REN Farming Limited | Sleaford | 2023 |
| Renaissance Africa Consultancy Ltd | London | 2019 |
| Renaissance Investments Limited | Shropshire | 1996 |
| Renaissance-Mein Ltd | St. Austell | 2020 |
| Renaq Ltd | Anstruther | 2026 |
| Renata Video Productions Ltd | Taunton | 2014 |
| Renatured CIC | Lincoln | 2022 |
| Rendog Joinery Ltd | Edinburgh | 2016 |
| Renegade Fishing Ltd | Isle Of Barra | 2021 |
| Renew East London C.I.C. | London | 2017 |
| Renewable Commodities Company Ltd | Sturminster Newton | 2025 |
| Renewable Fuels Limited | Wigan | 2002 |
| Renishaw Estates Limited | Renishaw | 1997 |
| Rennie Livestock Limited | Kelso | 2020 |
| Rennison Tree Specialists Limited | Northallerton | 2014 |
| Renown Fisheries Limited | Boston | 2000 |
| Renshaw Agri Contracts Ltd | Chesterfield | 2021 |
| Rent a Goat Ltd | Southampton | 2026 |
| Rent a STY Limited | Belford | 2013 |
| Rent a Tree Limited | Harpenden | 2023 |
| Renton Highlaws Limited | Northumberland | 2018 |
| Renuntiabo Limited | Prenton | 2006 |
| Renwick Fencing Limited | Alston | 2016 |
| Renwick Hamilton Farming Limited | Leven | 2025 |
| REO Stakis Limited | Johnstone | 2007 |
| REP North West Limited | Flint | 2019 |
| Replant the Planet Ltd | Reading | 2021 |