| Red Hawk Consultancy Ltd | Ballymena | 2025 |
| Red Hawk Fire Solutions Ltd | Watford | 2023 |
| Red Media Fire Safety Ltd | Canterbury | 2019 |
| Red Panda Learning Limited | Dartford | 2017 |
| Red Point Ltd | Stourbridge | 2003 |
| Red Property UK Limited | Ashford | 2004 |
| Red Robin Fire Limited | Rayleigh | 2026 |
| Red Rose Care NW Ltd | Blackburn | 2022 |
| Red Rose Fire Solutions Ltd | Dover | 2019 |
| Red Toad Consulting Limited | Carlisle | 2024 |
| Red Watch Fire Safety Ltd | Westerham | 2021 |
| Redcon Fire Systems Ltd | St. Leonards-On-Sea | 2021 |
| Reddy Fire & Security Ltd | Redruth | 2025 |
| Redetec Limited | Ashton-Under-Lyne | 2007 |
| Redforce Drones Ltd | Darlington | 2025 |
| Redgora Healthcare Limited Limited | Manchester | 2025 |
| Redian Limited | Northolt | 2019 |
| Redlines Fire Safety Consultancy Ltd | Poulton-Le-Fylde | 2020 |
| Redlink Recruitment Ltd | Richmond | 2013 |
| Redpath Respite Care Ltd | Bradford | 2025 |
| Reds Fitness CIC | Warrington | 2019 |
| Redway Electrical Design Ltd. | Stockport | 2014 |
| Redwood Fire Safety Ltd | Leighton Buzzard | 2025 |
| Reed Safety Consultants Limited | Prudhoe | 2024 |
| Reedwater Limited | Rushden | 2015 |
| Reem Therapy Limited | Birmingham | 2025 |
| Reeves Holdings Group Ltd | Brough | 2025 |
| Reflect Health Group Limited | Lancaster | 2020 |
| Refocus Education Limited | Hove | 2026 |
| Reform and Rise C.I.C. | Kington | 2025 |
| Reform Pathway CIC | Farnham | 2024 |
| REG Changes Limited | Belfast | 2022 |
| Regal 38I83 Ltd | London | 2018 |
| Regal Fire Limited | Sutton-In-Ashfield | 2002 |
| Regal Fire Safety Ltd | Newport Pagnell | 2025 |
| Regal Supported Living Ltd | Wallington | 2022 |
| Regalia Academy Ltd | Gillingham | 2023 |
| Regar Limited | Camberley | 2020 |
| Regency Passive Fire Protection Limited | Southend-On-Sea | 2011 |
| Regenerative and Cellular Medicine Registry Ltd | London | 2023 |
| Regent Fire Consultants Limited | Cleckheaton | 2019 |
| Regional Association of Art Education in Asia | Kington | 2022 |
| Regis Fire and Security Limited | Oldbury | 2025 |
| Registered Case Managers Limited | Leicester | 2019 |
| Registered Office Group Ltd | Edinburgh | 2016 |
| Reglogix Limited | Newbury | 2026 |
| Regnet-Africa & Regbonet- Africa Limited | London | 2025 |
| Regs First Ltd | Cardiff | 2019 |
| Regtechplatform Limited | London | 2017 |
| Regulate Limited | Birmingham | 2022 |
| Regulated Business Group Limited | Sale | 2016 |
| Regulation First UK Limited | Manchester | 2024 |
| Regulatory Affairs Services Ltd | Bedford | 2020 |
| Regulatory CMC Consultancy Ltd | Manchester | 2019 |
| Reguloop Ltd | Luton | 2025 |
| Rehoboth Children's Services Ltd | Hatfield | 2023 |
| Rehoboth Grace Limited | London | 2023 |
| Reid Consultancy (Aviation) Ltd | Bridgwater | 2021 |
| Reidale Sciences Ltd | London | 2018 |
| Reign Consultancy Ltd | London | 2022 |
| Reina Group Limited | Leicester | 2023 |
| Reiss Delaney TM Ltd | Doncaster | 2025 |
| REJ Fire Services Ltd | Sittingbourne | 2026 |
| Rel-Assist Plus Ltd | Shrewsbury | 2022 |
| Relax Skin School Limited | London | 2020 |
| Reliable Fire Services Ltd | York | 2019 |
| Reliance Care Group Limited | Addlestone | 2024 |
| Reliance Fire Limited | Newport | 2015 |
| Rellish Fire Services Ltd | London | 2025 |
| Remedose Ltd | Newcastle Upon Tyne | 2025 |
| Remedy & YOU Limited | Bedford | 2020 |
| Remedy Health Limited | Nottingham | 2024 |
| Reme’S Remedies Limited | Leeds | 2025 |
| Remon Fire Safety Limited | Milton Keynes | 2017 |
| Remote 24 Care Ltd | Oldham | 2025 |
| Remote Area Medical Services Ltd | Hereford | 2026 |
| Remote Horizon Ltd | Conwy | 2022 |
| Ren-Rc Ltd | Aylesbury | 2024 |
| Renbridge Services Ltd | Ellesmere Port | 2025 |
| Rencare Homes Ltd | London | 2023 |
| Rene Excel Limited | London | 2026 |
| Renegade Life Ltd | Loughton | 2025 |
| Renew Glow Clinic Ltd | Solihull | 2024 |
| Renewable Safety Services Limited | Middlesbrough | 2013 |
| Repill Healthcare Limited | London | 2025 |
| Replenish Reach CIC | Scunthorpe | 2026 |
| Reprieve | London | 2006 |
| Requiro Risk Consulting Ltd | Crewe | 2025 |
| Rescue 2 Limited | Arundel | 2012 |
| Rescue Line Wellness and First AID Training Ltd | Bury St. Edmunds | 2022 |
| Rescue North One Limited | Liverpool | 2019 |
| Resett Ltd | Loughton | 2023 |
| Residential Peeps Limited | Warrington | 2025 |
| Resilience Ukraine Limited | Poole | 2022 |
| RESILIENCE@4PW Ltd | Gloucester | 2026 |
| Resiliency Ltd | St. Helens | 2025 |
| Resilient Alliance Care Ltd | Stafford | 2024 |
| Resilient Ballistics Limited | Market Rasen | 2018 |
| Resilient Futures Coach Ltd | Neath | 2024 |
| Resilient Leadership Ltd | London | 2023 |