| RGS Solutions Limited | Information & communication | 2003 |
| RH Welding Services Limited | Construction | 2018 |
| Richard Durell Ltd | Construction | 2026 |
| RJL Geo-Technical Services Ltd | Professional & scientific | 2021 |
| RM Heritage Cleaning Ltd | Administrative & support | 2025 |
| RM Lifting Services UN Ltd | Manufacturing | 2024 |
| RMB Investment Properties Ltd | Real estate | 2025 |
| RNS Installations Ltd | Construction | 2021 |
| RO Refinishing Ltd | Wholesale & retail | 2025 |
| Robert Brown Furniture Limited | Manufacturing | 2014 |
| Rocket Forge Limited | Manufacturing | 2026 |
| Rodge Hair Ltd | Other services | 2016 |
| Rojean Investments Limited | Real estate | 2019 |
| Rook Tree Consulting Limited | Professional & scientific | 2014 |
| Rosborough Engineering Limited | Professional & scientific | 2014 |
| Rupert Erskine Consulting Limited | Information & communication | 2020 |
| RWA Land Ltd | Agriculture & fishing | 2008 |
| Ryden Developments Limited | Construction | 2009 |
| Ryden Holdings Limited | Financial services | 2021 |
| S & L Bathroom Services Limited | Construction | 2021 |
| S J Armitage Limited | Professional & scientific | 2022 |
| S&R Hunt Properties Ltd | Real estate | 2022 |
| S&R Offshore Solutions Ltd | Mining & quarrying | 2018 |
| S.R.E Transport Ltd | Transport & logistics | 2020 |
| Saliscrown Limited | Real estate | 1979 |
| Sanderson Solutions (South) Limited | Professional & scientific | 1999 |
| Sarodan Consulting Ltd | Professional & scientific | 2014 |
| Sauna HUS Ltd | Health & social care | 2026 |
| Scaffold East Anglia Limited | Administrative & support | 2013 |
| Scanimate Ltd | Information & communication | 2025 |
| Scarfe Plastering Ltd | Construction | 2020 |
| Sceadwe Films Ltd | Information & communication | 2026 |
| SDL Professional Services Limited | Professional & scientific | 2019 |
| Sea Plus Plus Limited | Professional & scientific | 2015 |
| Seasons Health Club Ltd | Education | 2011 |
| Secura UK Fire and Security Ltd | Manufacturing | 2012 |
| SET Transport Limited | Transport & logistics | 2008 |
| Sheepcote Limited | Administrative & support | 2015 |
| Shellbex Limited | Health & social care | 2018 |
| Shield Decorating Limited | Construction | 2010 |
| Shinny Cleaning by Danny Ltd | Administrative & support | 2025 |
| Shipmeadow Agriculture Ltd | Other services | 2024 |
| Shipmeadow Enterprises Ltd | Hospitality | 2022 |
| Silver Goose (Suffolk) Ltd | Wholesale & retail | 2024 |
| Silver Takeaway Ltd | Hospitality | 2021 |
| Simister Intelligent Solutions Ltd | Professional & scientific | 2004 |
| Sizzled Sausage Limited | Hospitality | 2022 |
| SJC Offshore Ltd | Administrative & support | 2014 |
| SJF Enterprises Ltd | Financial services | 2026 |
| SJF Karting Ltd | Arts & recreation | 2006 |
| SJH Warehousing Limited | Transport & logistics | 2017 |
| SLC Liverpool Ltd | Administrative & support | 1997 |
| SMC Leisure Holdings Limited | Other services | 2018 |
| SMC Leisure Services CIC | Other services | 2024 |
| Snowden Wright Group Ltd | Information & communication | 2020 |
| Soanes Builders Ltd. | Construction | 2004 |
| Solaplug Limited | Construction | 2007 |
| Sole Bay Waste & Recycling Services Ltd. | Water & waste | 2018 |
| Solent Laundry Solutions (Holding) Limited | Financial services | 2018 |
| Solent Laundry Solutions Ltd | Wholesale & retail | 2010 |
| Solidus Solutions Limited | Administrative & support | 2013 |
| Sotherton Corner Management Company Limited | Water & waste | 2000 |
| Sotterley Farms Limited | Agriculture & fishing | 1973 |
| Sotterley Investments Limited | Real estate | 2016 |
| Southwold Building & Design Consultancy Limited | Professional & scientific | 2020 |
| Sparkle Cleaning Norwich Limited | Administrative & support | 2012 |
| Spindlers Ltd | Hospitality | 2023 |
| Spirketts Lane (Harleston) Management Company Limited | Households | 2024 |
| Sport and Educational Travel Limited | Administrative & support | 2008 |
| Sporting Car Club of Norfolk Limited(The) | Arts & recreation | 1975 |
| Sprightlight Kindling Ltd | Wholesale & retail | 2024 |
| Spurdens & Swaisland Plumbing and Heating Limited | Construction | 2024 |
| Spurdens Plumbing & Heating Ltd | Construction | 2015 |
| Spurdens Property Developments Ltd | Construction | 2021 |
| SR Body Repair East Anglia Ltd | Wholesale & retail | 2023 |
| ST Advisor Services Ltd | Professional & scientific | 2026 |
| ST Annes Road Express Ltd | Wholesale & retail | 2019 |
| ST Annes Store Limited | Wholesale & retail | 2024 |
| ST John's Hall Storage Limited | Transport & logistics | 2003 |
| ST John's Park (Bungay) Management Company Limited | Households | 2022 |
| St.Benedicts Management Company | Real estate | 1998 |
| Stevenson Solutions Ltd | Manufacturing | 2025 |
| Stevox Brewery Ltd | Manufacturing | 2023 |
| Stirling Flats Residents Association Limited | Hospitality | 1986 |
| Stoven Hall Equine Clinic and Rehabilitation Centre Limited | Professional & scientific | 2007 |
| Stratton Stone Properties Limited | Real estate | 2018 |
| Stublla Ltd | Real estate | 2025 |
| Studiopymk Limited | Arts & recreation | 2019 |
| Sturman Letting Ltd | Real estate | 2026 |
| Style X (Bungay) Limited | Other services | 2013 |
| Suffolk Aviation Services Ltd | Transport & logistics | 2024 |
| Suffolk Bargain Stores Limited | Wholesale & retail | 2015 |
| Suffolk Hair Systems Clinic Ltd | Other services | 2023 |
| Suffolk Kitchen Co (East Anglia) Ltd | Wholesale & retail | 2024 |
| Suffolk Meadow Ltd | Manufacturing | 2025 |
| Suffolk Renovation Company (East Anglia) Limited | Construction | 2019 |
| Sunshine Pre-School and Day Care Limited | Education | 2008 |
| Superfry Chinese Takeaway Limited | Hospitality | 2019 |
| Surlingham Properties Limited | Construction | 2025 |
| Susan Child Consultancy Limited | Professional & scientific | 2015 |