| Ronax Holdings Limited | Households | 2024 |
| Ronin Utility Solutions Ltd | Administrative & support | 2025 |
| Roofing & Construction Ltd | Construction | 2012 |
| Rooftop Adventures Limited | Administrative & support | 2020 |
| Rooms to Clean Limited | Administrative & support | 2007 |
| Rosco Property Development Ltd | Real estate | 2017 |
| Rose Associates Financial Planning Ltd | Professional & scientific | 2018 |
| Rose Island Properties Ltd | Real estate | 2020 |
| Rose Topco Limited | Financial services | 2026 |
| Rosemary Street Management Company NO. 2 Limited | Households | 1992 |
| Rosemead Securities Ltd | Construction | 2017 |
| Roseville (Projects) Limited | Construction | 1998 |
| Rosi Designs Ltd | Construction | 2017 |
| Rosy LEE Cafe Ltd | Hospitality | 2015 |
| Route One Languages Ltd | Education | 2020 |
| Rowan Property Solutions Limited | Construction | 2016 |
| Rowbury Investments Limited | Financial services | 2017 |
| Rowe Protective Services Limited | Administrative & support | 2016 |
| Rowtech Group Limited | Construction | 2019 |
| ROX Aesthetics Ltd | Other services | 2020 |
| Roxy Homes Ltd | Real estate | 2019 |
| Royal Mint Street E1 Management Company Limited | Households | 1996 |
| Royol Aesthetics UK Ltd | Other services | 2019 |
| RPD Property Ltd | Real estate | 2025 |
| RPD Training Centre Limited | Professional & scientific | 2020 |
| RPG Food UK Ltd | Wholesale & retail | 2024 |
| RPL Group Holdings Limited | Financial services | 2024 |
| RS Retro Limited | Financial services | 2018 |
| RSI Environmental Limited | Water & waste | 2020 |
| Rskm Properties Limited | Real estate | 2025 |
| RSQ Holdings Ltd | Real estate | 2024 |
| RSQ Management Ltd | Real estate | 2024 |
| RSS International Ltd | Public administration | 2008 |
| Rsvp Online Ltd | Administrative & support | 2021 |
| RSW Building & Maintenance Limited | Construction | 2020 |
| Rtbs-Co Limited | Construction | 2013 |
| RTR Refrigeration & Air Conditioning Ltd | Manufacturing | 2026 |
| Rtsales Ltd | Wholesale & retail | 2019 |
| RTV2022 Limited | Financial services | 2025 |
| Rubbish Clearance Guaranteed Ltd | Water & waste | 2025 |
| Rudgcomm Ltd | Information & communication | 2009 |
| RUM CAY Island Developments Ltd | Extraterritorial | 2014 |
| Runko Limited | Administrative & support | 2017 |
| Runwell Property Rentals Limited | Real estate | 2026 |
| Russ and Webb Limited | Construction | 2006 |
| Russell Alexander Consulting Limited | Administrative & support | 2025 |
| Russian Doll Studios Ltd | Information & communication | 2011 |
| Rutland House Limited | Households | 1990 |
| Rutland Sustainability Limited | Professional & scientific | 2011 |
| RVZ Projects Ltd | Extraterritorial | 2007 |
| RW Consultancy Ltd | Professional & scientific | 2024 |
| RW UK Consultants Limited | Other services | 2024 |
| RWD Weld Testing Services Limited | Construction | 2009 |
| RWP Development Limited | Construction | 2016 |
| Ryan Monteith Limited | Manufacturing | 2015 |
| Rydal Design Ltd | Professional & scientific | 2024 |
| Ryder Promotions Ltd | Arts & recreation | 2019 |
| RZ Electrical Ltd | Construction | 2024 |
| S & C Fire Limited | Professional & scientific | 2016 |
| S & D Consulting Ltd | Administrative & support | 2008 |
| S & J Action Sports Limited | Arts & recreation | 2014 |
| S & P Classics Limited | Wholesale & retail | 2015 |
| S & S Global Freight Limited | Transport & logistics | 2017 |
| S a Raza & Sons Limited | Hospitality | 2025 |
| S and P Electrical Ltd | Construction | 2017 |
| S Culham Catering Ltd | Hospitality | 2023 |
| S Dixon Consultancy Ltd | Administrative & support | 2014 |
| S Dixon Properties Limited | Real estate | 2025 |
| S H Racing Limited | Other services | 1960 |
| S J Austin Investments Ltd | Real estate | 2024 |
| S J Warren Limited | Real estate | 2016 |
| S M (Holdings Essex) Limited | Extraterritorial | 2017 |
| S Mortlock Holdings Ltd | Extraterritorial | 2018 |
| S P Bardwell Trustee Limited | Extraterritorial | 2021 |
| S R Operations Ltd | Professional & scientific | 2016 |
| S S T Catering Limited | Hospitality | 2024 |
| S Sheen Ltd | Construction | 2025 |
| S V Gittins Property Ltd | Real estate | 2021 |
| S W Brook Builders Ltd | Construction | 2023 |
| S W Brook Construction Ltd | Construction | 2012 |
| S W Fishing Limited | Agriculture & fishing | 2018 |
| S&A Aviation Services Ltd | Manufacturing | 2013 |
| S&G Property Investors Limited | Real estate | 2023 |
| S&K Properties (Essex) Ltd | Real estate | 2023 |
| S&L Consultancy London Limited | Real estate | 2018 |
| S&Rc Holdings Ltd | Financial services | 2023 |
| S&S Documents Limited | Water & waste | 2024 |
| S-G Transport Training & Logistics Limited | Transport & logistics | 2012 |
| S.A.D Group Ltd | Health & social care | 2018 |
| S.H.A.R.P. (South East) Limited | Real estate | 2000 |
| S.Hunt Financial Services Limited | Financial services | 2018 |
| S.N.D. Site Steel Services Limited | Other services | 2009 |
| S.W. & M.L. Keys Limited | Other services | 2002 |
| S.W.M. Automotive Services Limited | Wholesale & retail | 2017 |
| S2N Records Limited | Information & communication | 2025 |
| S6 Signs Ltd | Manufacturing | 2018 |
| SA Building & Maintenance Ltd | Construction | 2024 |
| SA Coaching Limited | Professional & scientific | 2018 |
| Saas & Cloud Limited | Information & communication | 2015 |
| Sabre GAS Limited | Other services | 2014 |