| Quickfreeze Ltd | Professional & scientific | 2017 |
| Quicksilver Legal Services Ltd | Other services | 2015 |
| Quilla Limited | Construction | 2013 |
| Quintet Holdings Limited | Real estate | 2025 |
| R & a Design Services Limited | Professional & scientific | 2009 |
| R & D Fastfood Limited | Hospitality | 2022 |
| R & D Pizza Limited | Hospitality | 2024 |
| R & R Latimer Associates Limited | Professional & scientific | 2015 |
| R & R Tooling Solutions Limited | Manufacturing | 2008 |
| R C Automotive Limited | Wholesale & retail | 2012 |
| R D Matiki Limited | Transport & logistics | 2026 |
| R Dinneen Limited | Construction | 2012 |
| R Hughes Building & Conservation Limited | Administrative & support | 2010 |
| R J Estates (Northamptonshire) LLP | | 2016 |
| R J Properties Northamptonshire Limited | Other services | 2017 |
| R K Electrical and Development Limited | Construction | 2014 |
| R MAC Holdings Limited | Administrative & support | 2022 |
| R Milan Trans Ltd | Transport & logistics | 2026 |
| R Rajani & Co Ltd | Professional & scientific | 2002 |
| R S Accounting Limited | Professional & scientific | 2002 |
| R S Build Limited | Construction | 2003 |
| R T Foods (Midlands) Limited | Hospitality | 2018 |
| R T Smith Ltd | Construction | 2025 |
| R V Logistics Ltd | Transport & logistics | 2025 |
| R&D Designs Limited | Wholesale & retail | 2024 |
| R&G Poppleton Limited | Health & social care | 2003 |
| R&M Baines Properties Ltd | Real estate | 2025 |
| R&V Group Ltd | Hospitality | 2021 |
| R. Foster Plumbing and Heating Limited | Construction | 2018 |
| R. Smith Rentals Ltd | Real estate | 2025 |
| R.C.Tann (Properties) Limited | Real estate | 1959 |
| R.M.G Builders Limited | Construction | 2016 |
| RAD Electrics Ltd | Construction | 2016 |
| Radian Group Ltd | Administrative & support | 2023 |
| Radnes Services Limited | Administrative & support | 2008 |
| RAE Services Ltd | Construction | 2021 |
| Rafal Kolosinski Ltd | Transport & logistics | 2026 |
| Rainbow Nails Kettering Ltd | Other services | 2023 |
| Rainclear Systems Ltd | Extraterritorial | 2004 |
| Rainwater Direct Limited | Wholesale & retail | 2009 |
| Rainwater Online Holdings Limited | Professional & scientific | 2019 |
| Rald Automotive Ltd | Wholesale & retail | 2024 |
| Raml Estates Limited | Real estate | 2019 |
| RAMP4YOU Ltd | Administrative & support | 2022 |
| Ramrah Solutions Limited | Extraterritorial | 2013 |
| Rand Commercial Services Group Limited | Administrative & support | 2010 |
| Rand Property Services Limited | Real estate | 2010 |
| Randle Literary Ltd | Professional & scientific | 2025 |
| Rang Construction Ltd | Manufacturing | 2026 |
| Ranya Store Ltd | Wholesale & retail | 2023 |
| RAO Enterprise Ltd | Wholesale & retail | 2026 |
| Rapid Recovery Corby Limited | Wholesale & retail | 2020 |
| Rapido Global Services Ltd | Administrative & support | 2016 |
| Raps Consulting and Marketing Services Ltd. | Other services | 2015 |
| Rathwood Limited | Wholesale & retail | 2013 |
| Raunds Fish Bar Ltd | Hospitality | 2019 |
| Ravco Limited | Wholesale & retail | 2018 |
| Ravdriver Ltd | Transport & logistics | 2022 |
| Ravens Advisory Limited | Financial services | 2016 |
| Ravens Care Limited | Health & social care | 2020 |
| Ravensthorpe Car Sales Limited | Wholesale & retail | 2001 |
| RAW Fitness and Health Ltd | Arts & recreation | 2022 |
| RAW Lens Photography Ltd | Professional & scientific | 2026 |
| Rayaan Holdings Limited | Real estate | 2023 |
| Raybell and Sons Skip Hire and Recycling Limited | Water & waste | 1999 |
| Raybell and Sons Surfacing Limited | Construction | 2010 |
| Raybell Developments Limited | Real estate | 2011 |
| Raybell Properties Limited | Construction | 2020 |
| Raybell Property Investments Limited | Real estate | 2020 |
| Raybright 168 Limited | Transport & logistics | 2026 |
| RC Perfect Tiling Ltd | Construction | 2025 |
| RCI Europe | Other services | 1973 |
| RCI Europe (Points) Limited | Other services | 2001 |
| RCI Points Limited | Other services | 1997 |
| RCI Resort Management Limited | Real estate | 1994 |
| RCI Tourism Development (India) Ltd. | Other services | 1990 |
| RD TAM Ltd | Wholesale & retail | 2022 |
| RDC Technical Services Limited | Professional & scientific | 2023 |
| Reach Collaborative CIC | Health & social care | 2023 |
| REACH360 Limited | Professional & scientific | 2007 |
| Readefine Building Control Ltd | Construction | 2024 |
| Readored Limited | Other services | 2014 |
| Ready Rooms Limited | Real estate | 2017 |
| Real Direct Network Global Ltd | Administrative & support | 2013 |
| Realsolid Media Ltd | Information & communication | 2024 |
| REB Networks Ltd | Information & communication | 2021 |
| Rectory Nursery School Ltd | Education | 2016 |
| Red 5 Training Ltd | Education | 2023 |
| Red Brick Properties (Northants) Limited | Households | 2025 |
| Red Coral Ltd. | Real estate | 2020 |
| Red Kite Management Services Limited | Professional & scientific | 2003 |
| Red Lion (Rothwell) Limited | Hospitality | 2013 |
| Red Machine Ltd | Wholesale & retail | 2025 |
| Redas Transport Ltd | Transport & logistics | 2017 |
| Redd Technology Limited | Information & communication | 2025 |
| Reden Limited | Professional & scientific | 1999 |
| Redez Limited | Other services | 2014 |
| Redhouse Group Ltd | Real estate | 2024 |
| Redpike Homes Limited | Real estate | 2024 |
| Redpike Solutions Limited | Professional & scientific | 2007 |