| Rubber Glovva Ltd | Education | 2024 |
| RUBBISH2GO Waste Services Limited | Administrative & support | 2016 |
| Rubicon Building Ltd | Construction | 2019 |
| Rubicon Services Limited | Real estate | 1980 |
| Rubicon-Homes Ltd | Construction | 2021 |
| Rubikon Consulting Limited | Professional & scientific | 2016 |
| Rubix Media Group Ltd | Information & communication | 2020 |
| Rubly Group Ltd | Wholesale & retail | 2020 |
| Ruby & Claret Holdings Limited | Hospitality | 2022 |
| Ruby & Claret Limited | Wholesale & retail | 2018 |
| Ruby 24HRCARE Ltd | Health & social care | 2023 |
| Ruby Homes Ltd | Real estate | 2024 |
| Ruby Red Associates Limited | Information & communication | 2007 |
| Ruby Resourcing Limited | Agriculture & fishing | 2013 |
| Ruby Slippers UK Ltd | Hospitality | 2024 |
| Rucell Care Services Ltd | Health & social care | 2026 |
| Rucell Limited | Wholesale & retail | 2014 |
| Rucklers Property Holdings Ltd | Real estate | 2026 |
| Rudge Motorsport Developments Limited | Arts & recreation | 2022 |
| Ruelf Ltd | Public administration | 2024 |
| Rufus Consulting & Arbitration Ltd | Real estate | 2018 |
| Rugby First Limited | Administrative & support | 2003 |
| Rugby Phone Repair Hub Ltd | Wholesale & retail | 2024 |
| Rugby Riding Club Ltd | Education | 2025 |
| Rugby Spring Fair CIC | Administrative & support | 2026 |
| Ruhan Limited | Administrative & support | 2020 |
| Rukbridge Ltd | Financial services | 2019 |
| Ruki Ltd | Arts & recreation | 2022 |
| Rule Number One Studio Ltd | Administrative & support | 2018 |
| Run Plumbing and Heating Ltd | Construction | 2026 |
| Rung App Ltd | Information & communication | 2026 |
| Rungamai Investment Ltd | Health & social care | 2016 |
| Runner Cars Ltd | Transport & logistics | 2023 |
| Running Hare Limited | Wholesale & retail | 2006 |
| Running Wheel Services Ltd | Transport & logistics | 2021 |
| Ruppel Property Ltd | Real estate | 2019 |
| Ruqia Enterprises Ltd | Wholesale & retail | 2023 |
| Rusboyy Limited | Wholesale & retail | 2021 |
| Rush Food Ltd | Hospitality | 2025 |
| RUSH242 Ltd | Arts & recreation | 2022 |
| Rushden & Higham Rugby Union Football Club Ltd | Arts & recreation | 2016 |
| Rushden & Higham Rugby Union Football Club Trading Ltd | Arts & recreation | 2016 |
| Rushlift Limited | Administrative & support | 2005 |
| Rushmere PM Limited | Professional & scientific | 2017 |
| Russell Albany House Limited | Extraterritorial | 2009 |
| Russell Electrical (UK) Limited | Energy | 2003 |
| Russell J Milligan Ltd | Manufacturing | 2016 |
| Russell O'Grady Investments Ltd | Real estate | 2023 |
| Russell Parkhill Architects Limited | Professional & scientific | 2012 |
| Russell Roofing Ltd | Professional & scientific | 2003 |
| Russellcroft LLP | | 2007 |
| Russellcroft Management Limited | Households | 2021 |
| Russelove Ltd | Other services | 2024 |
| Russet Gray Properties Ltd | Real estate | 2022 |
| Russgold Limited | Manufacturing | 2004 |
| Rusty Donkey Ltd | Hospitality | 2025 |
| Rusu 2017 Ltd | Transport & logistics | 2017 |
| Rusu Logistics Ltd | Transport & logistics | 2026 |
| Ruth Motun Limited | Financial services | 2015 |
| Ruth-Top Rentals Ltd | Real estate | 2024 |
| Ruvi Ltd | Information & communication | 2024 |
| RV Property Limited | Real estate | 2016 |
| Rvabd Ltd | Information & communication | 2025 |
| RVC Ltd | Wholesale & retail | 2025 |
| RVR Management Limited | Information & communication | 2011 |
| RVR Real Estate Limited | Real estate | 2017 |
| RVS Engineering Limited | Construction | 2019 |
| RVW Construction Ltd | Construction | 2018 |
| RW Aviation Services Ltd | Professional & scientific | 2018 |
| RW Rigging Service's Ltd | Information & communication | 2022 |
| RW Warrington Crescent Limited | Hospitality | 2010 |
| RW123 Ltd | Transport & logistics | 2019 |
| RWF Construction Ltd | Construction | 2025 |
| RWP Property Ltd | Households | 2026 |
| RXA Grala Ltd | Transport & logistics | 2015 |
| Ryan Plastics Limited | Manufacturing | 1996 |
| Ryan QC Homes Ltd | Health & social care | 2010 |
| Ryan's Enterprises Ltd | Hospitality | 2020 |
| Ryancourts Limited | Professional & scientific | 2017 |
| Rydale Care Ltd | Public administration | 2023 |
| RYE House 10 Renewables Limited | Professional & scientific | 2023 |
| Ryehill Court Property Management Limited | Real estate | 1989 |
| Ryehills Estate Management Company Limited | Hospitality | 2011 |
| Ryehills Park Management Limited | Households | 2011 |
| Ryeland MK Limited | Transport & logistics | 2013 |
| Ryngwell Property Limited | Real estate | 2021 |
| Rynly Limited | Transport & logistics | 2022 |
| RZ Auto Ltd | Wholesale & retail | 2024 |
| S & B Property Development Ltd | Real estate | 2007 |
| S & C Construction (Northampton) Limited | Other services | 2014 |
| S & C Dickinson Limited | Administrative & support | 2004 |
| S & D Civils 2020 Limited | Extraterritorial | 2020 |
| S & D Paving 2011 Limited | Construction | 2011 |
| S & D Plant 2020 Limited | Extraterritorial | 2020 |
| S & D Surfacing Limited | Construction | 2022 |
| S & D TM Limited | Construction | 2022 |
| S & E Lettings and Properties Limited | Real estate | 2022 |
| S & F Imperial Services Ltd | Transport & logistics | 2018 |
| S & J Coleman Limited | Real estate | 2020 |
| S & K Vehicle Solutions Ltd | Administrative & support | 2025 |