| Style Mobility Limited | Wholesale & retail | 2017 |
| Style Taxis Limited | Transport & logistics | 2014 |
| SU73 Ltd | Professional & scientific | 2023 |
| Subacoustech Environmental Limited | Administrative & support | 2008 |
| Subb Ltd | Administrative & support | 2021 |
| Submotion Productions Ltd | Information & communication | 2017 |
| Subro’S Coffee Limited | Hospitality | 2026 |
| Subsidium Solutions Limited | Professional & scientific | 2014 |
| Substance Misuse Specialists Limited | Health & social care | 2023 |
| Subteno Limited | Professional & scientific | 2017 |
| Subthread Media Ltd | Information & communication | 2025 |
| Suburban Golf Norwich Ltd | Arts & recreation | 2015 |
| Subway High Street Ltd | Hospitality | 2011 |
| Subzero Solutions Limited | Information & communication | 2008 |
| Success Holdings INT Ltd | Financial services | 2026 |
| Successful Brands Limited | Other services | 2020 |
| Succession Alliance CIC | Administrative & support | 2025 |
| Sudha Residences Limited | Financial services | 2024 |
| SUE Lambert Trust | Health & social care | 2007 |
| Suffolk Boat Sales Ltd | Wholesale & retail | 2020 |
| Suffolk Care Limited | Administrative & support | 2022 |
| Suffolk Coastal Norse Limited | Water & waste | 2004 |
| Suffolk Estate Fencing Ltd | Administrative & support | 2015 |
| Suffolk Films Limited | Information & communication | 1995 |
| Suffolk Growth Partners Ltd | Other services | 2026 |
| Suffolk Jewellery & Antiques Limited | Wholesale & retail | 2022 |
| Suffolk Meat Traders Limited | Professional & scientific | 1958 |
| Suffolk Norse Limited | Transport & logistics | 2012 |
| Suffolk Norse Transport | Transport & logistics | 2012 |
| Suffolk Pharma Ltd | Wholesale & retail | 2018 |
| Suffolk Spa & Leisure Limited | Professional & scientific | 2017 |
| Suffolk Spa Retreats Ltd | Hospitality | 2019 |
| Suffolk’S Finest Limited | Hospitality | 2023 |
| Sugar Beet EH 1 Ltd | Hospitality | 2014 |
| Sugar Beet Investments Ltd | Hospitality | 2014 |
| Sugar Rush Ice Cream Ltd | Hospitality | 2025 |
| Sugarcane Bioproducts (Holdings) Limited | Administrative & support | 2017 |
| SUI 25 Ltd | Information & communication | 2016 |
| Sultan's Quality Products Limited | Manufacturing | 1984 |
| Sultan's Turkish Delight Limited | Manufacturing | 1992 |
| Sultans Limited | Manufacturing | 1979 |
| Sumi Worldwide Ltd | Professional & scientific | 2025 |
| Sumlock Bondain (East Anglia) Limited | Other services | 1986 |
| Sumlock Bondain Ltd | Other services | 2018 |
| Summer Garden and Leisure (Holdings) Limited | Financial services | 2021 |
| Summer Garden and Leisure Buildings Limited | Wholesale & retail | 1988 |
| Summerway Drove Energy Centre Limited | Energy | 2022 |
| Summit Heating Ltd | Construction | 2015 |
| Summit Recruitment Group Ltd | Construction | 2025 |
| Summit Strategies Ltd | Professional & scientific | 2026 |
| Summit Training Club Ltd | Arts & recreation | 2024 |
| Summon Athletics Ltd | Manufacturing | 2025 |
| Sumner & Scott Limited | Administrative & support | 2016 |
| Sumstar Healthcare Limited | Health & social care | 2020 |
| Sumwood Properties Limited | Real estate | 2018 |
| Sun & Blue Limited | Hospitality | 2012 |
| Sun & Earth Consulting Ltd | Professional & scientific | 2014 |
| Sun Essences Limited | Manufacturing | 2014 |
| Sun Global (UK) Ltd | Wholesale & retail | 2012 |
| Sun Housing Ltd | Real estate | 2018 |
| Sun Magnet Solar Ltd | Administrative & support | 2025 |
| Sun Moon and Stars Ltd | Other services | 2019 |
| Sunbeam Luxury Coaches Limited | Transport & logistics | 1966 |
| Sundial Systems Limited | Information & communication | 1997 |
| Sunflex UK Limited | Extraterritorial | 2017 |
| Sunfyr Barns Limited | Hospitality | 2025 |
| Sungain Limited | Extraterritorial | 2011 |
| Sungain Systems Limited | Extraterritorial | 2011 |
| Sunny Lodge Trails Limited | Real estate | 2026 |
| Sunnycroft Care Home Limited | Health & social care | 2015 |
| Sunnyside Pet Care Ltd | Professional & scientific | 2021 |
| Sunnyswazz UK Ltd | Health & social care | 2022 |
| Sunnyzeh Consultancy Services Limited | Health & social care | 2024 |
| Sunpro Solar Ltd | Energy | 2022 |
| Sunray Holdings Ltd | Financial services | 2017 |
| Sunrise 24 Limited | Hospitality | 2024 |
| Sunrise BIO Limited | Manufacturing | 2024 |
| Sunrise Coastal Ltd | Health & social care | 2025 |
| Sunset International Ltd | Manufacturing | 2018 |
| Sunshine Solar Limited | Wholesale & retail | 2004 |
| Sunshop Tanning & Wellbeing Norwich Ltd | Other services | 2019 |
| Sunshops Norwich Limited | Other services | 2016 |
| Sunwatch Ltd | Professional & scientific | 2024 |
| Supanova Energy Services Limited | Mining & quarrying | 2013 |
| Super Chef Limited | Hospitality | 1993 |
| Super Fast Food Services Ltd | Professional & scientific | 2014 |
| Super Pizza Swindon Limited | Hospitality | 2019 |
| Super R Limited | Water & waste | 2021 |
| Super Shiny Happy CIC | Information & communication | 2026 |
| Superdimple Limited | Public administration | 2025 |
| Superego Ltd | Health & social care | 2021 |
| Superhands Property Services Ltd | Households | 2025 |
| Superior Garden Buildings Limited | Wholesale & retail | 2012 |
| Superior Products UK Limited | Wholesale & retail | 2011 |
| Superniffy Cleaning Solutions Ltd | Administrative & support | 2025 |
| Superniffy Heating and Plumbing Limited | Construction | 2026 |
| Supernova Energy Services Ltd | Mining & quarrying | 2020 |
| Supine Ltd | Professional & scientific | 2014 |
| Supple.Ai Ltd | Information & communication | 2020 |
| Supplements & Wellbeing Ltd | Arts & recreation | 2019 |