| Richardsons Truck Services Ltd | Wholesale & retail | 2020 |
| Rioned UK Ltd | Wholesale & retail | 2005 |
| Riwe Limited | Hospitality | 2017 |
| Rixy Sisters Entertainment Limited | Hospitality | 2018 |
| Rixy Sisters Limited | Hospitality | 2017 |
| RJB (Thetford) Holdings Ltd | Wholesale & retail | 2025 |
| RK Carpentry and Building Ltd | Construction | 2022 |
| RKM Decorators Limited | Construction | 2004 |
| Rlsl Properties Ltd | Real estate | 2022 |
| Rmaa Property Limited | Real estate | 2026 |
| RMO Trading Anglia Limited | Wholesale & retail | 2016 |
| RNE Fire and Security Ltd | Administrative & support | 2025 |
| RNK Homes (East Anglia) Ltd | Real estate | 2025 |
| Robert Kazmiruk Limited | Administrative & support | 2017 |
| Robin Taylor Timber Merchants Limited | Wholesale & retail | 2002 |
| Rochester Capital Limited Partnership | | 2005 |
| Rock Paper Click Limited | Other services | 2016 |
| Rock, Paper, Property Ltd | Construction | 2020 |
| Rockpaperclick Talent Ltd | Administrative & support | 2017 |
| Rockship Limited | Wholesale & retail | 2025 |
| Rockwell Industries Ltd | Manufacturing | 2010 |
| Roco Development Projects Limited | Real estate | 2022 |
| Rollmark (Dieletlit) Limited | Manufacturing | 1967 |
| Roman Roofing (Norfolk) Limited | Administrative & support | 2017 |
| Rose Care Consultant Limited | Professional & scientific | 2019 |
| Rotoshim Limited | Manufacturing | 2024 |
| Rowling Farming Ltd | Agriculture & fishing | 2005 |
| Rowlinson Packaging (South) Limited | Manufacturing | 1989 |
| RS Combined Limited | Manufacturing | 2013 |
| RS Curtains & Blinds Limited | Wholesale & retail | 2018 |
| RS Taxis Dereham Ltd | Transport & logistics | 2023 |
| Rslc Developments Ltd | Construction | 2013 |
| Rslc Holdings Limited | Construction | 2021 |
| RSS Watton Top Barber Ltd | Other services | 2025 |
| RTH Highways Limited | Transport & logistics | 2026 |
| Rubi Audiology Limited | Manufacturing | 2022 |
| Rudis Developers Limited | Construction | 2019 |
| Rudlings Property Holdings Limited | Real estate | 2024 |
| Rudlings Solicitors LLP | | 2019 |
| Rumsey and Sayer Investments Limited | Real estate | 2025 |
| Rumsey Property Development Limited | Construction | 2018 |
| Runako Skin Ltd | Other services | 2025 |
| Rushford Developments Limited | Real estate | 2017 |
| Ruthlessly Committed Marketing Ltd | Administrative & support | 2023 |
| RVH Commercial Properties Ltd | Construction | 2023 |
| Rwpl Tele Limited | Information & communication | 2016 |
| Rymer Trees Limited | Agriculture & fishing | 2021 |
| S & R (Thetford) Catering Ltd | Hospitality | 2024 |
| S and S Renovations Ltd | Construction | 2002 |
| S J Neilson Sawmill and Bio-Mass Limited | Manufacturing | 2025 |
| S L Beck Nonclinical Consultant Limited | Professional & scientific | 2020 |
| S N Books Limited | Wholesale & retail | 2012 |
| S R Williams Electrical Services Ltd | Construction | 2022 |
| S Walker Electrical Services Limited | Construction | 2023 |
| S.L. Precision Engineers Limited | Manufacturing | 1991 |
| S.S.Eglington & SON Limited | Agriculture & fishing | 1957 |
| Sabba I.T Ltd | Information & communication | 2017 |
| Safe Care Concept Ltd | Health & social care | 2024 |
| Safeguard Investment Management Ltd | Construction | 2024 |
| Sage S&M Limited | Professional & scientific | 2025 |
| Sage Services (UK) Limited | Construction | 2006 |
| Sage Spark Ltd | Information & communication | 2026 |
| Said Market Ltd | Hospitality | 2025 |
| SAKCAGOZU27 Ltd | Other services | 2025 |
| Salec Travel Ltd | Transport & logistics | 2003 |
| SAM Meats Ltd | Manufacturing | 2024 |
| SAM Molyneux Properties Ltd | Real estate | 2026 |
| Samcon Property Management Limited | Households | 2025 |
| Santon Engineering Consultancy Ltd | Professional & scientific | 2026 |
| Santon Real Estate Limited | Real estate | 2022 |
| Sara Titmus Ltd | Other services | 2015 |
| Satchell & Sellers Ltd | Construction | 2025 |
| Saturn Industries Limited | Other services | 2025 |
| Saun Precision Engineering Ltd | Manufacturing | 2010 |
| Savo (Suffolk Academy for Voluntary Organisations) CIC | Education | 2014 |
| Savov Trades Ltd | Wholesale & retail | 2023 |
| Sawdust Productions Ltd | Arts & recreation | 2022 |
| Scaffolding Management Services Limited | Construction | 2016 |
| Scarlett Research Limited | Professional & scientific | 2005 |
| SCC Property Holdings Ltd | Real estate | 2025 |
| Scenic Carpentry Limited | Construction | 2024 |
| SCR Racing Ltd | Administrative & support | 2025 |
| Sdfad Ltd | Wholesale & retail | 2024 |
| Sdgp Ltd | Health & social care | 2023 |
| Sea Stone Property Limited | Real estate | 2026 |
| SEARCH4SUPPLIERS Limited | Hospitality | 2017 |
| Searle's Forestry Limited | Agriculture & fishing | 2025 |
| Searle's Holdings Limited | Agriculture & fishing | 2005 |
| Searle's Property Ltd | Real estate | 2024 |
| Seawave Media Ltd | Information & communication | 2009 |
| Secrets.Art Limited | Wholesale & retail | 2026 |
| Senyo Electrical Services Ltd | Construction | 2017 |
| Seraphra Limited | Wholesale & retail | 2025 |
| Serenity Hair Design (East Anglia) Limited | Other services | 2018 |
| Sevenbar Limited | Hospitality | 2024 |
| SGK Roofing Ltd | Construction | 2021 |
| Shat-R-Shield Limited | Professional & scientific | 1998 |
| Shelley Quality Management Services Ltd | Professional & scientific | 2015 |
| Sheree Jarrold Financial Planning Services Ltd | Professional & scientific | 2019 |
| SI Logistics Limited | Transport & logistics | 2021 |