| Suffolk Tax Solutions Limited | Professional & scientific | 2017 |
| Suffolk Yurt Holidays Limited | Hospitality | 2010 |
| Sulley Knights Partnership Limited | Construction | 2025 |
| Summer Isle Films Limited | Professional & scientific | 2023 |
| Sumpter Property Solutions Ltd | Real estate | 2026 |
| Sunlite Group Ltd | Manufacturing | 2018 |
| Sunrise Coast Company Limited | Manufacturing | 2009 |
| Super Yacht Captain Ltd | Extraterritorial | 2020 |
| Suppliedgb Ltd | Wholesale & retail | 2025 |
| Supply Innovations Ltd | Transport & logistics | 2023 |
| Surface Solutions 2 Ltd | Construction | 2025 |
| Sustainability by Design Ltd | Professional & scientific | 2010 |
| Sustainable and Responsible Solutions Limited | Professional & scientific | 2009 |
| Sustainable Water Services Ltd | Professional & scientific | 2026 |
| Sutton HOO Chicken Limited | Agriculture & fishing | 2017 |
| Sutton HOO Produce Limited | Agriculture & fishing | 1993 |
| Sutton House Management Limited | Professional & scientific | 1993 |
| Suzanne Howells Limited | Extraterritorial | 2021 |
| SVW Consultancy Ltd | Wholesale & retail | 2024 |
| Swainston 1964 Limited | Extraterritorial | 2014 |
| Swampies Ltd | Extraterritorial | 2005 |
| Swan Construction (East Anglia) Ltd. | Construction | 1995 |
| Swan Golf Designs Limited | Professional & scientific | 1994 |
| Swan Properties (East Anglia) Limited | Real estate | 2009 |
| Sway Services Ltd | Professional & scientific | 2006 |
| Swim on the Hill Ltd | Education | 2023 |
| Swordfish CMP Limited | Wholesale & retail | 1998 |
| Sych Properties Ltd | Real estate | 2024 |
| Syndicate 3 Ltd | Construction | 2022 |
| Synergy Advantage Limited | Professional & scientific | 2010 |
| Synergy Audio Limited | Arts & recreation | 2001 |
| System Thinking Limited | Professional & scientific | 2018 |
| T & G Lettings Ltd | Real estate | 2021 |
| T Kidd Engineering and Property Limited | Professional & scientific | 2018 |
| T&C Payne Services Ltd | Construction | 2022 |
| T&V Butcher Limited | Construction | 2007 |
| T.N. Associates Limited | Information & communication | 1989 |
| TAG Training & Consultancy Limited | Professional & scientific | 2010 |
| Tangham Campsites Ltd | Hospitality | 2024 |
| Tanyard and Maulden's Management Company Limited | Real estate | 2001 |
| Targeting Zero LLP | | 2018 |
| Tarzanku Ltd | Hospitality | 2015 |
| Tasova Ltd | Hospitality | 2026 |
| Tauk (Suffolk) Ltd | Real estate | 2021 |
| Taviso Limited | Information & communication | 2021 |
| Tcas 1940 Ltd | Professional & scientific | 2026 |
| Techcity Media Ltd | Information & communication | 2013 |
| Technically High Ltd | Information & communication | 2011 |
| Technicraft (Anglia) Limited | Professional & scientific | 1973 |
| Technicraft (NCW) Limited | Financial services | 2002 |
| Techsit Limited | Manufacturing | 2014 |
| Tecnisis Limited | Manufacturing | 2001 |
| Tekhoi Limited | Information & communication | 2006 |
| Telecommunications Management Consultants Limited | Professional & scientific | 1999 |
| Tellfield Wells Limited | Construction | 1978 |
| Tendring New Homes Limited | Real estate | 2012 |
| Test Digital Ltd | Information & communication | 2019 |
| Testers Autos Limited | Wholesale & retail | 2017 |
| Texo Estates Limited | Professional & scientific | 2017 |
| TFG Inns Ltd | Hospitality | 2024 |
| TG Heating & Plumbing Ltd | Construction | 2021 |
| Thackeray Heating Limited | Construction | 2015 |
| THE Actors Training Academy Limited | Arts & recreation | 2025 |
| THE Air Conditioning Specialists (Southern) Limited | Construction | 2022 |
| THE Air Conditioning Specialists Ltd | Construction | 2019 |
| THE Art Haven C.I.C. | Professional & scientific | 2025 |
| THE Bell Partnership Limited | Professional & scientific | 2022 |
| THE Blocking House Ltd | Manufacturing | 2026 |
| THE Bridge Marketing (Suffolk) Limited | Professional & scientific | 2011 |
| THE British Bulldog Company Limited | Extraterritorial | 2015 |
| THE Car Body Shop (Suffolk) Limited | Wholesale & retail | 2009 |
| THE Cat’S Whiskers Gallery Ltd | Wholesale & retail | 2026 |
| THE Colchester Vets Ltd | Professional & scientific | 2024 |
| THE Create East of England Fund Limited Partnership | | 2003 |
| THE CRM Strategy Co Ltd | Information & communication | 2024 |
| THE Diner at Bentwaters Ltd | Hospitality | 2022 |
| THE Donsworth Group Limited | Professional & scientific | 2004 |
| THE East Coast Cocktail Company Limited | Wholesale & retail | 2019 |
| THE English House (Framlingham) Ltd | Wholesale & retail | 2023 |
| THE English House Limited | Manufacturing | 2005 |
| THE Fable Bureau Ltd | Professional & scientific | 2017 |
| THE Fireplace (Framlingham) Limited | Wholesale & retail | 2013 |
| THE Fisk Farm Ltd | Agriculture & fishing | 2021 |
| THE Flying Guardsman Limited | Hospitality | 2020 |
| THE Framlingham Wine Shop Ltd | Wholesale & retail | 2013 |
| THE Galley Restaurant Limited | Real estate | 1997 |
| THE Garretts (Carr Avenue) Management Company Limited | Households | 2025 |
| THE Gift GAP Ltd | Manufacturing | 2023 |
| THE Giggle Factory Ltd | Professional & scientific | 2007 |
| THE Granary (Woodbridge) Limited | Households | 1998 |
| THE Grove House Hotel Ltd | Hospitality | 2001 |
| THE Handsome Prints Company Limited | Information & communication | 2015 |
| THE Haus of Dog Limited | Wholesale & retail | 2024 |
| THE Havens Management Limited | Real estate | 1991 |
| THE HEN House East Anglia Ltd | Construction | 2026 |
| THE Holm Kitchen Limited | Manufacturing | 2024 |
| THE Home Service Limited | Other services | 1997 |
| THE Hot Box Store Ltd | Wholesale & retail | 2026 |
| THE Hub Business Centre Ipswich Ltd | Real estate | 2012 |
| THE Hungry Stag Cafe Ltd | Hospitality | 2020 |