| THE INK Parla Ltd | Arts & recreation | 2013 |
| THE Joiners Arms Ltd | Hospitality | 2025 |
| THE Kind Basket Company Ltd | Wholesale & retail | 2021 |
| THE Kitchen Range & Cookshop LLP | | 2016 |
| THE Kitchen Supper Company Ltd | Hospitality | 2025 |
| THE Land Group (Barrow) LLP | | 2010 |
| THE Land Group (Suffolk) Limited | Administrative & support | 2006 |
| THE Land Group Investments Ltd. | Professional & scientific | 2004 |
| THE Land Group London LLP | | 2011 |
| THE Laundry Stop Ltd | Administrative & support | 2015 |
| THE Little Preservatory Ltd | Manufacturing | 2026 |
| THE London Make House Limited | Wholesale & retail | 2014 |
| THE LOW House CIC | Hospitality | 2018 |
| THE Mays Family Investments Ltd | Financial services | 2024 |
| THE Neathouse Limited | Hospitality | 2019 |
| THE New Peach Bower Limited | Hospitality | 2016 |
| THE Oaks (Dallinghoo Road) Management Company Limited | Administrative & support | 2015 |
| THE Old Mill Trading Company (Marlesford) Limited | Wholesale & retail | 2003 |
| THE Outdoor Kitchen Makers Limited | Manufacturing | 2024 |
| THE Pine Estate Management Limited | Real estate | 2020 |
| THE Producery Ltd | Information & communication | 2025 |
| THE Professional Deputy Service Trust Corporation Limited | Professional & scientific | 2016 |
| THE Railway Fram Ltd | Hospitality | 2025 |
| THE Salon (Melton) Limited | Other services | 2010 |
| THE Sandlings Centre Limited | Hospitality | 2018 |
| THE Seckford Foundation | Education | 2005 |
| THE SLO Club Ltd | Education | 2026 |
| THE Sorrel Horse Shottisham Limited | Hospitality | 2011 |
| THE Sports Department Limited | Wholesale & retail | 2022 |
| THE Suffolk Cottage Collection Ltd | Households | 2021 |
| THE Suffolk Punch Trust | Agriculture & fishing | 2002 |
| THE Suffolk Wedding Dress Exchange Limited | Wholesale & retail | 2013 |
| THE Sutton HOO Ship's Company | Manufacturing | 2016 |
| THE Tea HUT Ltd | Hospitality | 2014 |
| THE Thallo Practice Ltd | Health & social care | 2021 |
| THE Udder Bar Limited | Hospitality | 2025 |
| THE United Healthcare Land Company Limited | Real estate | 2004 |
| THE Valla Music Group LLP | | 2026 |
| THE Vault Europe Ltd | Wholesale & retail | 2023 |
| THE Very Sensible Company Limited | Real estate | 1988 |
| THE White Horse Badingham Limited | Hospitality | 2018 |
| THE Wickham Market Partnership | Arts & recreation | 2002 |
| THE Woodbridge Kitchen Company Limited | Wholesale & retail | 2015 |
| THE Woodbridge Vets Ltd | Professional & scientific | 2021 |
| Thingamabobs Collectables Limited | Wholesale & retail | 2025 |
| Thisisreubens Ltd | Wholesale & retail | 2025 |
| Thomas & Parratt Builders Ltd | Construction | 2018 |
| Thomas Franklin Limited | Administrative & support | 2005 |
| Thomas Mills High School | Education | 2011 |
| Thompsons Coaches Limited | Transport & logistics | 2002 |
| Thomson Mcewan Development Limited | Professional & scientific | 2013 |
| Thornborough Park Management Limited | Households | 2024 |
| Thread Communications LP | | 2011 |
| Thread Media Limited | Professional & scientific | 1997 |
| Three Crowns Associates Limited | Arts & recreation | 2025 |
| Three Musketeers Limited | Agriculture & fishing | 2001 |
| Tidal Hill Limited | Agriculture & fishing | 2009 |
| Tideturn Ltd | Professional & scientific | 2024 |
| Tigger Consultancy Limited | Professional & scientific | 2020 |
| Tilted Tea Ltd | Wholesale & retail | 2024 |
| Timber Fram Builders Ltd | Construction | 2019 |
| Timber Framed Buildings Ltd | Construction | 2017 |
| Timberfield Limited | Professional & scientific | 1996 |
| Timberline Utilities Limited | Agriculture & fishing | 2025 |
| Timberwolf Contracts Ltd | Construction | 2022 |
| Timberwolf Electrical Ltd | Construction | 2020 |
| Timberwolf Fire Protection Ltd | Public administration | 2023 |
| Timberwolf Groundworks Ltd | Construction | 2022 |
| Timberwolf Group EA Ltd | Financial services | 2025 |
| Timberwolf Group Ltd | Real estate | 2024 |
| Tink and Grow Ltd | Agriculture & fishing | 2020 |
| TLC Private Wealth Ltd | Administrative & support | 2024 |
| Tlc's Trees & Garden Services Ltd | Administrative & support | 2020 |
| TMF Sales Ltd | Wholesale & retail | 2025 |
| TML (Bawdsey) Ltd | Administrative & support | 2012 |
| TMP Carpentry Ltd | Construction | 2014 |
| TMS Shops Ltd | Wholesale & retail | 2024 |
| Tmxb Services Ltd | Hospitality | 2025 |
| Toby's Pet Shop Ltd | Wholesale & retail | 2009 |
| Tobyview Limited | Information & communication | 1997 |
| Tollgate Healthcare (East Anglia) Ltd | Health & social care | 2012 |
| TOM Harbinson Limited | Administrative & support | 2016 |
| TOM Partridge Design Ltd | Professional & scientific | 2011 |
| Tony Ryder Design Ltd | Professional & scientific | 2022 |
| Tony Ryder Project Services Ltd | Professional & scientific | 2025 |
| Toplawns Property Management Limited | Households | 1991 |
| Topsail Associates Ltd | Agriculture & fishing | 2008 |
| Torsion Consultants UK Ltd | Information & communication | 2016 |
| Torsion Consulting Ltd | Information & communication | 2015 |
| Total Refurbishment Limited | Manufacturing | 2012 |
| Touchstone Consulting Limited | Information & communication | 2010 |
| Trading Zone Associates Ltd | Information & communication | 2016 |
| Transcend Freight Specialists Ltd | Professional & scientific | 2021 |
| Transformation Tuesday Limited | Professional & scientific | 2024 |
| Tree Magic Ltd | Administrative & support | 2026 |
| Treescape Group Ltd | Agriculture & fishing | 2022 |
| Triangle Nursery Limited | Wholesale & retail | 1997 |
| Tricky Jays Ltd | Hospitality | 2021 |
| Trinity Construction Consultancy Limited | Construction | 2000 |
| Trinity Green (Colkirk) Management Company Limited | Households | 2023 |