| Standout Sports Limited | Wholesale & retail | 2022 |
| Stanley Wattam Limited | Other services | 1962 |
| Stanstar Consulting Ltd | Professional & scientific | 2013 |
| Stanton & Stubbs Holdings Ltd | Financial services | 2026 |
| Stanton & Stubbs Ltd | Construction | 2013 |
| Star Plumbing, Heating & Renewables Ltd | Construction | 2014 |
| Starjoy T/A Restore Wellbeing Limited | Health & social care | 2023 |
| Startronics Limited | Construction | 2013 |
| Starway Computer Services Limited | Information & communication | 2003 |
| Station Court (Trimley ST Mary) Management Company Limited | Professional & scientific | 2006 |
| Steady Light Ltd | Other services | 2017 |
| Steele Fine Foods Limited | Hospitality | 2011 |
| Stefkov Trading Limited | Wholesale & retail | 2023 |
| Stennik Advertising Limited | Administrative & support | 1983 |
| Stephen M DAW Ltd | Professional & scientific | 2003 |
| Steven Frost (Builder) Ltd | Construction | 2006 |
| Steven Hills Ltd | Information & communication | 2015 |
| Stolensben Limited | Professional & scientific | 2022 |
| Structural Holdings and Consultancy Limited | Real estate | 1993 |
| Studio Catherine Barber Limited | Professional & scientific | 2013 |
| Style My Garden Limited | Wholesale & retail | 2020 |
| Styne Electrical Limited | Manufacturing | 2018 |
| Styne Group Limited | Manufacturing | 2022 |
| Styne Industrial Refrigeration Limited | Manufacturing | 2015 |
| Styne Ltd | Manufacturing | 2012 |
| Styne NET Zero Ltd | Construction | 2022 |
| Suffolk Holidays Ltd | Real estate | 2023 |
| Suffolk Wine Company Limited | Agriculture & fishing | 2014 |
| Sulo Estate Limited | Financial services | 2024 |
| Sunrise Healthcare Ltd | Real estate | 2011 |
| Sunshine Wholefoods Ltd | Wholesale & retail | 2019 |
| Super Twos Ltd | Wholesale & retail | 2023 |
| Sustainable Developments (SW) Limited | Construction | 2004 |
| Swan Nursery Ltd | Education | 2005 |
| Sweep N Clean Property Maintenance Ltd | Administrative & support | 2020 |
| Swift Track Digital Limited | Information & communication | 2017 |
| Swimsure Swim School Limited | Arts & recreation | 2010 |
| Sword & Trowel Limited | Professional & scientific | 2015 |
| Syncro Networks Ltd | Professional & scientific | 2024 |
| T a Cullum Contracting Ltd | Agriculture & fishing | 2021 |
| T. & J. Hollingsworth Limited | Construction | 2003 |
| T.D. Joinery Limited | Manufacturing | 2003 |
| T.G.A. Communications Limited | Transport & logistics | 1987 |
| Taber Holdings Limited | Financial services | 2019 |
| Taino Management Services Limited | Professional & scientific | 2019 |
| Take Five Diss Ltd | Manufacturing | 2023 |
| Tangible Brands Ltd | Professional & scientific | 2024 |
| Tanside Buckles Ltd | Administrative & support | 2002 |
| TAR and Chip Surfacing Ltd | Construction | 2022 |
| Taxi Diss Ltd | Transport & logistics | 2024 |
| Taylor & Kemp Ltd | Real estate | 2025 |
| Taylor Wilson Solutions Ltd | Construction | 2010 |
| TB London Holdings Limited | Real estate | 2026 |
| TB London Ltd | Manufacturing | 2019 |
| TC EA Limited | Professional & scientific | 2024 |
| TCM Maintenance Ltd | Construction | 2020 |
| TCP Installations Limited | Construction | 2020 |
| TD Management Group Ltd | Manufacturing | 2019 |
| Tdmel PVT Ltd | Health & social care | 2014 |
| Team Cornerstone Ltd | Construction | 2014 |
| Teamwork (London) Limited | Construction | 1999 |
| Technically Stable Ltd | Wholesale & retail | 2022 |
| Technicalxtc Limited | Information & communication | 2002 |
| Techno Innovation Research Limited | Professional & scientific | 2025 |
| Techstallion Ltd | Wholesale & retail | 2020 |
| Telemetry Associates Limited | Administrative & support | 2001 |
| Temple Motor Engineering Limited | Wholesale & retail | 2018 |
| Tess Capital Investment Ltd | Real estate | 2021 |
| Tess Enterprises Limited | Real estate | 2018 |
| TF Social Work Ltd | Health & social care | 2013 |
| Thailand TOO Ltd | Hospitality | 2026 |
| That's the Spirit Events Ltd | Hospitality | 2023 |
| Thatcher Consulting Limited | Professional & scientific | 2014 |
| THE Aldeburgh Literary Festival Limited | Arts & recreation | 2005 |
| THE APR Company (UK) Ltd | Construction | 2016 |
| THE Asian Pantry Ltd | Wholesale & retail | 2025 |
| THE Bald Box CIC | Wholesale & retail | 2026 |
| THE Bicycle Shop Limited | Hospitality | 2019 |
| THE Bookmill Ltd | Information & communication | 2017 |
| THE Chestnuts (Flat Management) Limited | Real estate | 2003 |
| THE Chimney Sweeping Company Ltd | Administrative & support | 2019 |
| THE Coalition for Associations in Global Mobility | Other services | 2025 |
| THE Crown Inn Limited | Professional & scientific | 2007 |
| THE D B Crown Ltd | Hospitality | 2026 |
| THE Diss Corn Hall Trust | Arts & recreation | 2009 |
| THE Diss Honest Brewing Company Limited | Extraterritorial | 2014 |
| THE Diss Honest Gallery Limited | Wholesale & retail | 2017 |
| THE Diss Honest Group Limited | Financial services | 2017 |
| THE Diss Honest PUB Company Limited | Hospitality | 2014 |
| THE Dressage Company (UK) Ltd | Agriculture & fishing | 2015 |
| THE Estate Agency Hub Ltd | Real estate | 2023 |
| THE European Fertility Society C.I.C. | Other services | 2020 |
| THE EYE Show (Outdoor Events) Limited | Arts & recreation | 1984 |
| THE Financial Hub Ltd | Financial services | 2019 |
| THE Forge Cafe (Thornham) Limited | Hospitality | 2018 |
| THE Garboldisham FOX Community Interest Company | Hospitality | 2016 |
| THE Great Event Company Ltd | Administrative & support | 2005 |
| THE Greyhound Botesdale Ltd | Hospitality | 2024 |
| THE Guest House Management Limited | Households | 2024 |
| THE Gypsy Caravan Company Limited | Manufacturing | 2006 |