| Roses Kitchen London Ltd | Hospitality | 2023 |
| Roseton Limited | Extraterritorial | 2000 |
| Rosettco Limited | Health & social care | 2025 |
| Rosewood Care Providers Ltd | Health & social care | 2025 |
| Rosgerard Ltd | Wholesale & retail | 2020 |
| Ross Electrical Ltd | Construction | 2017 |
| Ross Haley Limited | Information & communication | 2014 |
| Ross Tyres Limited | Wholesale & retail | 2004 |
| Rossanne House Management Company Limited | Households | 1988 |
| Rota Gezgin UK Ltd | Administrative & support | 2026 |
| Rothleys Group Ltd | Health & social care | 2019 |
| Rouge Creatives Limited | Arts & recreation | 2017 |
| Roundside Properties Limited | Real estate | 1991 |
| Route Art Cafe Limited | Hospitality | 2025 |
| Routes Estates Ltd | Households | 2023 |
| Rowanwood Mews Management Company Limited | Households | 2001 |
| Rowhurst Limited | Real estate | 1987 |
| ROY Dixon Consulting Ltd | Professional & scientific | 2025 |
| Royal Wharf Properties Ltd | Real estate | 2018 |
| Royale Group (UK) Limited | Other services | 2020 |
| Royale Gulf Limited | Administrative & support | 2016 |
| Royalness VIP Travel Limited | Professional & scientific | 2025 |
| Royce Hire Ltd | Administrative & support | 2020 |
| Royel Property Management Ltd | Households | 2026 |
| Royle Estates (Hoddesdon) Limited | Real estate | 1972 |
| ROZ Consulting Ltd | Education | 2023 |
| Roza UK Logistics Ltd | Transport & logistics | 2022 |
| Rozil Limited | Wholesale & retail | 2022 |
| RP Makafui Limited | Financial services | 2015 |
| Rplk Property Ltd | Real estate | 2024 |
| RR PVT Ltd | Wholesale & retail | 2017 |
| Rreth Tiling Ltd | Construction | 2026 |
| RRO2 Limited | Hospitality | 2017 |
| RS Development Projects Ltd | Other services | 2021 |
| RS United IT Solutions Ltd | Information & communication | 2014 |
| RSA Grill Limited | Hospitality | 2018 |
| RSA Island Village Limited | Other services | 1997 |
| RSA Trust | Administrative & support | 2004 |
| RSC Ventures Limited | Professional & scientific | 2008 |
| RSD Travel Limited | Administrative & support | 2011 |
| RSN Scenery Services Ltd | Construction | 2023 |
| RSP Global Entertainment Limited | Hospitality | 2025 |
| RSS (Essex) Limited | Professional & scientific | 2007 |
| RSS Accounting Limited | Professional & scientific | 2018 |
| RT Yigit Ltd | Hospitality | 2025 |
| RTL Business Services Limited | Financial services | 2018 |
| RTR Projects Limited | Construction | 2018 |
| RTS Collective Limited | Administrative & support | 2026 |
| Rubi Enterprises Ltd | Wholesale & retail | 2014 |
| Ruby & Richard Limited | Professional & scientific | 2012 |
| Ruby Freight Services Ltd | Transport & logistics | 2016 |
| Ruby Industries Ltd | Professional & scientific | 2013 |
| Ruby Nails & Spa Limited | Other services | 2022 |
| Ruby Nails & Spa Seaforth Limited | Other services | 2022 |
| Rubymoy Charms Ltd | Administrative & support | 2018 |
| Rudra One Ltd | Professional & scientific | 2024 |
| RUG and Roll Limited | Manufacturing | 2025 |
| RUG Wash Choice Ltd | Other services | 2015 |
| Rugmof Properties Ltd | Real estate | 2025 |
| Ruhama London Ltd. | Other services | 2019 |
| Rujo Care Services Limited | Health & social care | 2019 |
| Rule Refurbs Ltd | Other services | 2017 |
| RUM & Smoke Ltd | Hospitality | 2022 |
| Run Media Limited | Professional & scientific | 2005 |
| Runner Engineering Ltd | Construction | 2025 |
| Runs UK Properties Limited | Real estate | 2026 |
| Rupaal Care & Training Ltd | Education | 2011 |
| Rupaal Properties Ltd | Real estate | 2023 |
| Rushdene Consulting Limited | Professional & scientific | 2024 |
| Rushmoor Eastcote Limited | Construction | 2025 |
| Russel Build Ltd | Manufacturing | 2019 |
| Russell Lee's Maintenance Limited | Information & communication | 2015 |
| Ruthie Ltd | Financial services | 2026 |
| Ruzgar Properties Limited | Real estate | 2021 |
| Ruzzgar Dekorasyon Ltd | Construction | 2022 |
| RV Catering Ltd | Hospitality | 2022 |
| RV Ice Ltd | Manufacturing | 2026 |
| RV Star Stairs London Ltd | Construction | 2024 |
| Rvcl Properties Ltd | Real estate | 2024 |
| Rvlets Ltd | Hospitality | 2025 |
| RW2 Projects Limited | Administrative & support | 2006 |
| Rwan Consultants Ltd | Information & communication | 2019 |
| RWR Recycle Limited | Extraterritorial | 2006 |
| RY Quality Meats Ltd | Administrative & support | 2016 |
| Ryan O'Donovan Haulage Ltd | Administrative & support | 2010 |
| Ryan O'Donovan Investments Ltd | Financial services | 2023 |
| Rycold Holdings Ltd | Administrative & support | 2017 |
| Ryville Consultants Limited | Other services | 2014 |
| Ryzon Ltd | Real estate | 2021 |
| S & a O'Hara Limited | Real estate | 2008 |
| S & B Distribution Ltd | Wholesale & retail | 2010 |
| S & F Plumbing and Heating Ltd | Construction | 2025 |
| S & O Enterprises Ltd | Professional & scientific | 2018 |
| S & S Design and Construction Limited | Extraterritorial | 2008 |
| S & S Florist Limited | Wholesale & retail | 2025 |
| S & S London Ltd | Other services | 2003 |
| S & T Fast Foods Ltd | Hospitality | 2022 |
| S & T Properties Ltd | Real estate | 2018 |
| S & T Trading(Uk) Ltd | Wholesale & retail | 2025 |
| S B Communications Ltd | Information & communication | 2008 |