| RS Travel EN Ltd | Transport & logistics | 2026 |
| RSA Gate Automation Ltd | Administrative & support | 2020 |
| RSA Infotech Ltd | Information & communication | 2015 |
| Rsantostransport Limited | Administrative & support | 2025 |
| RSM Management Company Limited | Households | 2007 |
| RST Landrovers Limited | Wholesale & retail | 2003 |
| RST Online Limited | Administrative & support | 2010 |
| RST Outdoors Limited | Wholesale & retail | 2020 |
| RT Installations Ltd | Construction | 2006 |
| RT Interiors Ltd | Wholesale & retail | 2026 |
| RT UK (2017) Limited | Wholesale & retail | 2017 |
| RTB Trees Ltd | Administrative & support | 2025 |
| RTC Fire and Safety Ltd | Financial services | 2016 |
| Rtdb Consulting Limited | Professional & scientific | 2014 |
| RTP Analytical Services Limited | Professional & scientific | 2009 |
| RTT Marine Operations Ltd | Transport & logistics | 2025 |
| RTW Surgeries Ltd | Health & social care | 2025 |
| Ruach Medias Ltd | Information & communication | 2026 |
| Ruba Asset Management Limited | Real estate | 2024 |
| Rubellite Developments Ltd | Real estate | 2019 |
| Rubicks IT Services Limited | Information & communication | 2013 |
| Rubicon Pictures Limited | Information & communication | 1999 |
| Rubicon Storage Ltd | Transport & logistics | 2025 |
| Rubino Kitchen Limited | Hospitality | 2015 |
| Rubinoq Limited | Real estate | 2025 |
| Rubix Bars Ltd | Hospitality | 2019 |
| Rubra Properties Ltd | Construction | 2022 |
| Ruby Care Services Ltd | Administrative & support | 2016 |
| Rubys Home Limited | Health & social care | 2024 |
| Rudd Leisure Ltd | Wholesale & retail | 2017 |
| Ruddy Good Group Limited | Wholesale & retail | 2022 |
| Rudina Doci Ltd | Other services | 2019 |
| Rudstar Ltd | Information & communication | 2025 |
| Ruffell Enterprises Limited | Professional & scientific | 2010 |
| Rugby Pups Limited | Arts & recreation | 2013 |
| Rugeley and District Masonic Company | Other services | 2005 |
| RUI Aero Ltd | Wholesale & retail | 2025 |
| Rumble Inns Limited | Information & communication | 2007 |
| Rumos Advisory Ltd | Information & communication | 2026 |
| Rumpuppy Ltd | Households | 2025 |
| Run Box Limited | Wholesale & retail | 2019 |
| Runkins Farm Holdings Limited | Administrative & support | 2017 |
| Running Numbers Ltd | Professional & scientific | 2025 |
| Runtco Limited | Financial services | 2006 |
| Runwell Couriers Ltd | Transport & logistics | 2014 |
| Runwell Leisure Ltd | Construction | 2019 |
| Runwell Technologies Limited | Information & communication | 2023 |
| Runya Ltd | Information & communication | 2019 |
| Rupert Lewin Racing Limited | Wholesale & retail | 2002 |
| Rural Housing Partnership Limited | Construction | 2019 |
| Rural Landscape and Construction Ltd | Construction | 2019 |
| Ruralcity Media Limited | Information & communication | 2000 |
| Rusden Limited | Construction | 1987 |
| Rushbrigg Limited | Hospitality | 2023 |
| Rushby Construction Ltd | Construction | 2022 |
| Russell Court (IP11 2DR) RTM Company Limited | Households | 2021 |
| Russell Daniels Limited | Professional & scientific | 2002 |
| Rustenberg Wines (Europe) Limited | Wholesale & retail | 2001 |
| Rusty 12 Ltd | Professional & scientific | 2012 |
| Rusu Electrical Ltd | Administrative & support | 2017 |
| Rusupo Heating & Plumbing Ltd | Construction | 2019 |
| Rusupo Property Services Ltd | Real estate | 2015 |
| Ruth Jenkinson Photography Ltd | Administrative & support | 2011 |
| Ruth MAY Consulting Limited | Professional & scientific | 2024 |
| RUX Energy UK Ltd | Professional & scientific | 2023 |
| RV for Trailers Ltd | Wholesale & retail | 2025 |
| RVP Engineering Ltd | Administrative & support | 2022 |
| Rvss Homes Limited | Real estate | 2020 |
| RW Coaching Limited | Education | 2025 |
| RWH Marketing Limited | Real estate | 2026 |
| Rwts (JR Stone) Ltd | Professional & scientific | 2023 |
| Rxchange Ltd | Information & communication | 2007 |
| Ryan Jansen (Feldenkrais) Limited | Health & social care | 2016 |
| Ryan Kurian Limited | Health & social care | 2015 |
| Ryan Laley Games Ltd | Information & communication | 2023 |
| Ryanpe Moving Ltd | Transport & logistics | 2025 |
| RYE Farm Limited | Agriculture & fishing | 2007 |
| Ryemoors Limited | Construction | 1982 |
| Rylan Ltd | Arts & recreation | 2013 |
| Rylux Property Investments Ltd | Real estate | 2024 |
| Rylux Property Ltd | Real estate | 2024 |
| Ryzing Limited | Real estate | 2019 |
| RZA Structures Ltd | Professional & scientific | 2025 |
| S & G Security Ltd | Administrative & support | 2024 |
| S & K (Elmstead) Limited | Wholesale & retail | 2013 |
| S & L Homes Ltd | Real estate | 2023 |
| S & M Cleaning Group Ltd | Administrative & support | 2025 |
| S & M Contractors Limited | Administrative & support | 1999 |
| S & P Plumbing Contracts Ltd | Construction | 2019 |
| S & R Training Limited | Education | 2022 |
| S & S Caribbean Restaurant and Cafe Limited | Hospitality | 2016 |
| S & S Cleaning Services (Essex) Ltd | Other services | 2005 |
| S & S Heating and Plumbing Ltd | Construction | 2013 |
| S Birch Group Limited | Real estate | 2019 |
| S Casanovas Limited | Other services | 2017 |
| S D Bandara Ltd | Health & social care | 2025 |
| S E Sport Services Limited | Administrative & support | 2012 |
| S F Ipswich Limited | Wholesale & retail | 1991 |
| S H Patel & Company Limited | Professional & scientific | 2008 |
| S Hare Electrical Ltd | Construction | 2008 |