| Suttons Farm Crafts Limited | Manufacturing | 2025 |
| Swan Consultancy & Psychology Services Ltd | Extraterritorial | 2023 |
| Swell Music CIC | Arts & recreation | 2020 |
| Synenergy Limited | Professional & scientific | 2023 |
| T Edwards Home Solutions Ltd | Construction | 2014 |
| T Tevenan Limited | Construction | 2016 |
| T4 Contracting Ltd | Real estate | 2018 |
| Talbot and Doubleday Commercials Limited | Manufacturing | 2019 |
| Taradine Limited | Professional & scientific | 2007 |
| Tea Factory Management Company Limited | Real estate | 2023 |
| Templewicks Limited | Real estate | 2001 |
| Terrace Technology Limited | Other services | 2017 |
| TG Eaves Limited | Construction | 2016 |
| THE BAP Truck Ltd | Hospitality | 2021 |
| THE Beauty Loft Beccles Limited | Other services | 2024 |
| THE Benacre Company Limited | Agriculture & fishing | 2016 |
| THE Benacre Estates Charity | Education | 1997 |
| THE Black Dog Recycling Company Ltd | Transport & logistics | 2007 |
| THE Blossom Clinic Ltd | Health & social care | 2019 |
| THE Cambridge Gelato Co. Ltd | Hospitality | 2026 |
| THE Car Shop (Beccles) Limited | Wholesale & retail | 2015 |
| THE Cyder Farm Ltd | Hospitality | 2026 |
| THE Hideout Cafe Ltd | Hospitality | 2012 |
| THE Needlecraft Shop Limited | Wholesale & retail | 2006 |
| THE Norfolk Honey Company Limited | Manufacturing | 2013 |
| THE Old Forge Collective Limited | Agriculture & fishing | 2024 |
| THE Play RIG Ltd | Hospitality | 2025 |
| THE Prestige Finance Specialists Ltd | Financial services | 2019 |
| THE Printer Limited | Manufacturing | 2005 |
| THE Prize PIG Ltd | Hospitality | 2024 |
| THE Southwold and Reydon Educational Trust Limited | Education | 1936 |
| THE Southwold Renovation Company Ltd | Construction | 2024 |
| THE Spinney Land Management Group Limited | Households | 2025 |
| THE Stables Kitchen Ltd | Hospitality | 2019 |
| The.Woodview.Project Ltd | Education | 2024 |
| Thomas Veterinary Ltd | Professional & scientific | 2013 |
| Three Rivers Boat Hire Limited | Administrative & support | 2022 |
| Three Rivers Parc Limited | Hospitality | 2018 |
| Three Rivers Rooms Limited | Hospitality | 2022 |
| Thrive Physiotherapy Services Ltd | Health & social care | 2026 |
| Thunderstrike Limited | Health & social care | 2018 |
| Tick Motor Care Ltd | Wholesale & retail | 2020 |
| Tickitiboo Limited | Wholesale & retail | 2022 |
| Tides Reach Limited | Real estate | 1974 |
| TIM Harrison Tree Services Limited | Water & waste | 2013 |
| TIP Exchange Limited | Information & communication | 2006 |
| TJ Construction & Landscaping Limited | Construction | 2013 |
| TMC Car Sales Limited | Wholesale & retail | 2005 |
| Toadhall.Life Ltd | Hospitality | 2021 |
| Todhunter Limited | Agriculture & fishing | 2019 |
| Toft Monks Properties Limited | Real estate | 2013 |
| Toft Monks White Lion Limited | Hospitality | 2023 |
| Tonkin Consultancy Co Ltd | Professional & scientific | 2021 |
| Tony Bellinger Woodwork Ltd | Manufacturing | 2025 |
| Top to Tail Clothing Limited | Wholesale & retail | 2024 |
| TPM Site Management (East Anglia) Limited | Professional & scientific | 2018 |
| Trade Electricals Direct Ltd | Wholesale & retail | 2024 |
| Training for Skills Ltd | Education | 2022 |
| Travalodge Limited | Hospitality | 2021 |
| Travel Differently Ltd | Administrative & support | 2020 |
| Trepack Limited | Professional & scientific | 2010 |
| Tribe Media London Ltd | Information & communication | 2017 |
| Trinity Timber Preservation and Damp Control Limited | Construction | 1990 |
| Trisha's Chippy Limited | Extraterritorial | 2021 |
| Truck & Plant Engineering Limited | Wholesale & retail | 1998 |
| Truck Diver Ltd | Transport & logistics | 2019 |
| Truly Digital Media Limited | Information & communication | 2012 |
| TVS Cctv Ltd | Manufacturing | 2007 |
| Tvsm Ltd | Wholesale & retail | 2021 |
| UAV Drone Surveys Limited | Administrative & support | 2016 |
| Uggeshall Spaniels Ltd | Wholesale & retail | 2023 |
| Uggeshall Trustee Company Limited | Professional & scientific | 2003 |
| UK Parachute Services Limited | Transport & logistics | 1984 |
| UK Voty Ltd | Administrative & support | 2026 |
| Ultimate Boxing Limited | Wholesale & retail | 2012 |
| Unipal | Education | 2010 |
| USA Nails Beccles NR Ltd | Other services | 2017 |
| V.C Cooke Limited | Water & waste | 2008 |
| Vaultscellarbar Limited | Hospitality | 2025 |
| Veritas Cloud Ltd | Information & communication | 2019 |
| Vernum Broadcast Ltd | Information & communication | 2020 |
| Victoria Court (Lowestoft) Management Co. Limited | Households | 1987 |
| Victorian Greenhouses (UK) Limited | Construction | 2013 |
| Viewpoint Management Shipmeadow Ltd | Households | 2017 |
| Vigilis Tree Shelters Ltd | Agriculture & fishing | 2022 |
| Viking Plumbing Services Limited | Construction | 2013 |
| W J H Online Ltd | Information & communication | 2023 |
| W Stopher Limited | Water & waste | 2006 |
| Walsh Windows Limited | Construction | 2008 |
| Washco Limited | Wholesale & retail | 1928 |
| Waveney Decorators Limited | Construction | 2002 |
| Waveney House Hotel Limited | Hospitality | 2000 |
| Waveney Hybrid Heating Limited | Construction | 2026 |
| Waveney Oddjobs LLP | | 2023 |
| Waveney Online Limited | Administrative & support | 2023 |
| Waveney Properties Limited | Construction | 2002 |
| Waveney Stoves & Fireplaces Limited | Wholesale & retail | 2016 |
| Waveney Valley Wealth Management Ltd | Financial services | 2015 |
| WBB Limited | Mining & quarrying | 2021 |
| Webbwoods Ltd | Professional & scientific | 2019 |