| ROB Lowson Business Services Ltd | Administrative & support | 2014 |
| ROB Plumb Garden and Landscaping Ltd | Administrative & support | 2016 |
| Robert C.Scutt Limited | Manufacturing | 1955 |
| Robert Crow Limited | Transport & logistics | 2017 |
| Robert D Small Ltd | Information & communication | 2021 |
| Robert-Marinela Ltd | Transport & logistics | 2023 |
| Roberto Ices Limited | Wholesale & retail | 2003 |
| Roberts Assets Ltd | Real estate | 2020 |
| Roberts Court (Ipswich) Ltd | Real estate | 2000 |
| Roberts Electrical Limited | Construction | 2001 |
| Robin's Childcare Limited | Education | 2026 |
| Robinson Holdings Limited | Administrative & support | 2008 |
| Robinsons Motor Engineers Limited | Wholesale & retail | 2009 |
| Robot Jump Limited | Information & communication | 2017 |
| Robot Management Ltd | Professional & scientific | 2020 |
| Robush Components Ltd | Wholesale & retail | 2022 |
| Robust Business Limited | Professional & scientific | 2020 |
| Robyn & Finch Ltd | Wholesale & retail | 2022 |
| Roc's Fish & Chips Ltd | Hospitality | 2026 |
| Roch Developments Ltd | Real estate | 2024 |
| Rochie Robins Ltd | Wholesale & retail | 2026 |
| Rock Lobster Sailing Ltd | Administrative & support | 2024 |
| Rocket Music Store Limited | Wholesale & retail | 2014 |
| Rocket Remote Assist Limited | Administrative & support | 2019 |
| Rodbridge Limited | Wholesale & retail | 2003 |
| Roeside Property Ltd | Real estate | 2023 |
| Roff Caterers Limited | Hospitality | 1973 |
| Roger Beaton Limited | Professional & scientific | 2016 |
| Roger George Properties Ltd | Real estate | 2020 |
| Rogue 5 Limited | Transport & logistics | 2025 |
| Rohit Soni & Co. Holdings Ltd | Financial services | 2025 |
| Rohit Soni & Co. Limited | Wholesale & retail | 2003 |
| ROJ Ltd | Hospitality | 2017 |
| Roker Developments LLP | | 2024 |
| ROKO94 Ltd | Transport & logistics | 2020 |
| Rokusbel Ltd | Administrative & support | 2025 |
| Rokyflor Trans Ltd | Transport & logistics | 2020 |
| Rolfe Cine Productions Ltd | Information & communication | 2024 |
| Rollerblindsdepot.Com Limited | Wholesale & retail | 2024 |
| Rolstar Limited | Construction | 2022 |
| Romale Fresh & Clean Ltd | Administrative & support | 2025 |
| Romale Star Ltd | Construction | 2023 |
| Romana Carry LLP | | 2018 |
| Romana Ventures LP | | 2018 |
| Romas Wellness Ltd | Health & social care | 2025 |
| Romeround Residents Association Limited | Hospitality | 1992 |
| Romi Trans Ltd | Transport & logistics | 2019 |
| Romwater Limited | Administrative & support | 2004 |
| Ronant(Suffolk) Limited | Extraterritorial | 2025 |
| Ronin Rail Ltd | Professional & scientific | 2018 |
| Ronnroey Limited | Health & social care | 2015 |
| Roof Master Suffolk Ltd | Construction | 2025 |
| Roofsoleil Limited | Wholesale & retail | 2017 |
| Rooftop Mortgages Limited | Financial services | 2002 |
| Rookie Rockie Ltd | Arts & recreation | 2022 |
| Root Home Group Limited | Financial services | 2025 |
| Root Home Limited | Real estate | 2015 |
| Roots Cabin One Ltd | Real estate | 2025 |
| Rootz Hair Studio Limited | Other services | 2016 |
| Rope 44 Ltd | Wholesale & retail | 2023 |
| Roper Rentals Ltd | Real estate | 2021 |
| Rose & Co Lifestyle Limited | Wholesale & retail | 2018 |
| Rose & GUY Ltd | Manufacturing | 2017 |
| Rose Accounting Services Ltd | Professional & scientific | 2010 |
| Rose and Thorn PUB Company Limited | Hospitality | 2023 |
| Rose Dragon Technologies Limited | Information & communication | 2026 |
| Rose Food Ltd | Hospitality | 2024 |
| Rose Heating & Plumbing Ltd | Construction | 2021 |
| Rose House Gardens Management Company Limited | Households | 2022 |
| Roseberry Investments Ltd | Real estate | 2023 |
| Rosehip Chase (ELY) Block Management Company Limited | Households | 2022 |
| Rosemill Investments Ltd | Households | 2018 |
| Rosemount (Felixstowe) Limited | Households | 1984 |
| Rosenflex (UK) Limited | Wholesale & retail | 2006 |
| Rosenflex EOT Ltd | Wholesale & retail | 2024 |
| Rosenqvist DOT Limited | Information & communication | 2019 |
| Roseterm Limited | Real estate | 1985 |
| Rosetrade Ltd | Wholesale & retail | 2021 |
| Rosh Foods Ltd | Wholesale & retail | 2017 |
| Rosie Watson Limited | Real estate | 2025 |
| Ross Halliday Consulting Ltd | Professional & scientific | 2023 |
| Ross Marketing and Sales Limited | | 1974 |
| ROTE8 Limited | Wholesale & retail | 2014 |
| Round Acre Ltd | Agriculture & fishing | 2014 |
| Roundwood Restorations Limited | Construction | 2001 |
| Route 77 Transport Ltd | Transport & logistics | 2025 |
| Route and Box Trading and Consultancy Ltd | Transport & logistics | 2026 |
| Rova Fruit & VEG Ltd | Wholesale & retail | 2024 |
| ROW Electrical LLP | | 2026 |
| ROW London Construction Ltd | Construction | 2022 |
| Rowan Tree Salter Healthcare Ltd | Professional & scientific | 2024 |
| Rowans Care Limited | Health & social care | 2003 |
| Rowans Properties Limited | Administrative & support | 2016 |
| Rowelite Limited | Arts & recreation | 2022 |
| Rowledge Consulting Ltd | Professional & scientific | 2026 |
| Rowles Management Limited | Professional & scientific | 2020 |
| Rowntree Films Limited | Information & communication | 2021 |
| ROX Produx Ltd | Wholesale & retail | 2025 |
| Roxburgh Roofing Limited | Construction | 2004 |
| Roya Asset Investment Limited | Hospitality | 2016 |