| Reason Services Limited | Construction | 2025 |
| Red Bull Farming Ltd | Agriculture & fishing | 2015 |
| Red House Farm Haughley Ltd | Hospitality | 2023 |
| Red Lion Estates Ltd | Real estate | 2026 |
| Red Willows Management Company Limited | Administrative & support | 2019 |
| Redhut Group Ltd | Manufacturing | 2021 |
| Reeve & Co (Bathrooms and Tiles) Limited | Wholesale & retail | 2011 |
| Reeve & Co Interiors Limited | Manufacturing | 2015 |
| Reeve's Property Management Limited | Financial services | 2018 |
| Refind Commerce Limited | Wholesale & retail | 2023 |
| Reform Property Management Ltd | Real estate | 2022 |
| Relax and Gleam Holiday Property Management Limited | Real estate | 2026 |
| Relax and Gleam Ltd | Administrative & support | 2021 |
| Reliance EPM Limited | Professional & scientific | 2013 |
| Remember, Relive Ltd | Information & communication | 2022 |
| Renaissance Saab Limited | Wholesale & retail | 2026 |
| Renew East Ltd | Energy | 2021 |
| Renpro Limited | Construction | 2016 |
| Rent a Kitchen Ltd | Administrative & support | 2020 |
| Reticulate Technologies Limited | Information & communication | 2000 |
| Reynoldsfloorsanding Ltd | Construction | 2023 |
| RGP Building Design & Energy Consultancy Limited | Construction | 2012 |
| Rich Property Maintenance Limited | Real estate | 2015 |
| Richard Driver Limited | Transport & logistics | 2011 |
| Ricketts Restock Ltd | Wholesale & retail | 2026 |
| Ritorni Limited | Extraterritorial | 2010 |
| Riverside Autos Limited | Wholesale & retail | 2005 |
| RIX Residential Ltd | Real estate | 2025 |
| Rj's Auto Electrical Ltd | Wholesale & retail | 2023 |
| RJB Plumbing & Bathrooms Limited | Construction | 2020 |
| RJM Vehicle Maintenance Ltd | Wholesale & retail | 2025 |
| RM Rental Properties Limited | Real estate | 2023 |
| RMI Renewables Ltd | Professional & scientific | 2021 |
| ROB Fort Consultancy Limited | Professional & scientific | 2024 |
| Robbie Wilson Limited | Transport & logistics | 2008 |
| Rockeast Music School Limited | Education | 2026 |
| Rogers Hornsby Limited | Real estate | 2025 |
| Rolling With the Stones Ltd | Professional & scientific | 2020 |
| Rolyat Anneis Consulting Limited | Professional & scientific | 2025 |
| Room Wraights Ltd | Real estate | 2023 |
| Rose Care for YOU Limited | Health & social care | 2016 |
| Rose Hill Farm Rifle Range Limited | Arts & recreation | 2024 |
| Rosea Plastering Services Limited | Construction | 2022 |
| Route to Retail Limited | Professional & scientific | 2025 |
| Rozo Limited | Professional & scientific | 2018 |
| RTL Online Ltd | Wholesale & retail | 2024 |
| Rudland Property Holdings Ltd | Real estate | 2021 |
| Runaway Coast Limited | Extraterritorial | 2023 |
| Russell Upton Limited | Administrative & support | 2013 |
| Ruthen Consulting Limited | Health & social care | 2013 |
| S & a Civil Engineering Limited | Construction | 2025 |
| S F S (General Services) Ltd | Manufacturing | 2015 |
| S Horrex Carpentry Limited | Construction | 2015 |
| S K Groundworks, Landscaping & Crushing Limited | Construction | 2011 |
| S L Psychology Ltd | Health & social care | 2018 |
| S-Klob Limited | Real estate | 2020 |
| Sabre Trading Limited | Information & communication | 2009 |
| Safe & Sound Hygiene & Pest Control Limited | Administrative & support | 2011 |
| Saiyaval Security Services Ltd | Administrative & support | 2024 |
| Sakura Studio Gallery Ltd | Wholesale & retail | 2024 |
| Salmet Consulting Limited | Professional & scientific | 2003 |
| Saltykitten Limited | Wholesale & retail | 2023 |
| SAM Brown Dental Limited | Health & social care | 2023 |
| SAM Clark Talent Development Solutions Ltd | Professional & scientific | 2026 |
| SAM R Services Ltd | Professional & scientific | 2021 |
| Samaia Limited | Financial services | 2022 |
| Sampson Blinds Ltd | Wholesale & retail | 2010 |
| Samuel Henry Property Rentals Ltd | Real estate | 2016 |
| Sara Parker Limited | Professional & scientific | 2015 |
| Sarah Ramos HR Consulting Limited | Professional & scientific | 2017 |
| Sarchl Ltd | Wholesale & retail | 2025 |
| Sasa Marketing Ltd | Professional & scientific | 2019 |
| Saultlucia Limited | Health & social care | 2008 |
| Saxham Limited | Construction | 2002 |
| SB Automotive Consultants Ltd | Administrative & support | 2019 |
| SB Carpentry Contractors Ltd | Manufacturing | 2024 |
| SBS Developments (EA) Ltd | Real estate | 2020 |
| Scala Colabs Limited | Construction | 2018 |
| Schnieder Boots Limited | Manufacturing | 2024 |
| Scholar Engines Limited | Wholesale & retail | 2003 |
| Scholes Property Limited | Real estate | 2021 |
| School Meadow Wetherden Limited | Other services | 1984 |
| School Sports Agent Ltd | Education | 2025 |
| Scott Property Group (East Anglia) Ltd | Real estate | 2021 |
| Scott Waring Design Limited | Professional & scientific | 2020 |
| SDT Logistics Ltd | Transport & logistics | 2019 |
| SDW Services (Suffolk) Limited | Construction | 2020 |
| Sea to Peak Expeditions Ltd | Arts & recreation | 2022 |
| Sea View Block 3 Esplanade Court Limited | Administrative & support | 2009 |
| Seager Construction Consultancy Limited | Construction | 2019 |
| Seager Court Tenants Association Limited | Households | 2018 |
| Seager Engineering Limited | Professional & scientific | 2019 |
| Seawater Limited | Information & communication | 2004 |
| Second Engine Ltd | Professional & scientific | 2026 |
| Second Home Private Limited | Information & communication | 2025 |
| Secondfix Timber Holdings Ltd | Financial services | 2025 |
| Secondfix Timber Limited | Manufacturing | 2001 |
| Sector Properties Limited | Real estate | 2021 |
| Seeking Performance Ltd | Professional & scientific | 2022 |
| Selina Taylor Photography Ltd | Professional & scientific | 2013 |