| THE Needle Mover Group Ltd | Financial services | 2026 |
| THE Old Dairy (Felixstowe) Ltd | Households | 2021 |
| THE Peartree Kindergarten (Felixstowe) Ltd | Education | 2024 |
| THE Salon by Jennifer Louise Ltd | Other services | 2015 |
| THE Salon by the Sea Ltd | Education | 2021 |
| THE Sativa Lounge Ltd | Wholesale & retail | 2020 |
| THE Skye Lounge Limited | Hospitality | 2021 |
| THE Social Seat Agency Limited | Administrative & support | 2025 |
| THE Tech Game Ltd. | Information & communication | 2011 |
| THE Trimley Hand Ltd | Hospitality | 2022 |
| THE Trimley Shop Ltd | Wholesale & retail | 2014 |
| THE Trimley Sports and Social Club Limited | Hospitality | 1977 |
| THE White Seahorse (Felixstowe) Limited | Hospitality | 2025 |
| THE Wild MAN Inn Ltd | Hospitality | 2026 |
| THE Woodbridge and District Flyer Ltd | Professional & scientific | 2004 |
| THE Wool BAA 2.0 Ltd | Hospitality | 2025 |
| THE Wool BAA Ltd | Wholesale & retail | 2019 |
| Themiddleaisleuk Ltd | Wholesale & retail | 2021 |
| Thistleandthorn Ltd | Administrative & support | 2024 |
| Thrive Lifestyle Store Ltd | Wholesale & retail | 2025 |
| Tide Forwarding Ltd | Transport & logistics | 2021 |
| Tide Worldwide Ltd | Transport & logistics | 2021 |
| TIM Hand Production LLP | | 2022 |
| Timeea-Trans Ltd | Transport & logistics | 2018 |
| Tinks Top to TOE Beauty Limited | Other services | 2016 |
| Tiny Homes and Houses Limited | Construction | 2020 |
| Titan Engineering Surveyors Ltd | Professional & scientific | 2023 |
| TNT Handling Ltd | Transport & logistics | 2025 |
| Toast Coffee Shop Ltd | Hospitality | 2025 |
| TOM Martin Auto Repairs Limited | Wholesale & retail | 2015 |
| Tomasz Madej Ltd | Transport & logistics | 2022 |
| Tomi Transport Ltd | Transport & logistics | 2024 |
| Tomline Management Limited | Households | 2007 |
| Tomy Transport Ltd | Transport & logistics | 2022 |
| Tooty Limited | Hospitality | 2025 |
| Top Draw Catering Limited | Hospitality | 2025 |
| Top Lifts Ltd | Construction | 2020 |
| Top That Cake Ltd | Wholesale & retail | 2012 |
| Toro Services Ltd | Transport & logistics | 2024 |
| Total Joyrider Limited | Wholesale & retail | 2023 |
| Totally Outside Limited | Administrative & support | 2007 |
| Town Pastors | Public administration | 2014 |
| Town Pastors (Felixstowe) | Professional & scientific | 2012 |
| TR Marius Transport Ltd | Transport & logistics | 2021 |
| Trade Infolink (UK) Limited | Professional & scientific | 2000 |
| Trader Shipping Limited | Extraterritorial | 1981 |
| TRAIN4TRACK Ltd | Construction | 2023 |
| Traker Ltd | Transport & logistics | 2016 |
| Trans UK Services Limited | Transport & logistics | 2025 |
| Transemm Ltd | Transport & logistics | 2014 |
| Transmode Logistics Ltd. | Transport & logistics | 2009 |
| Transport Equipment Services Ltd | Administrative & support | 2015 |
| Travelsafe Limited | Transport & logistics | 1996 |
| Treelane Limited | Professional & scientific | 2000 |
| Trevose Freehold Limited | Households | 2022 |
| Trimley Estate Limited | Real estate | 2026 |
| Trimley Maritime Services Ltd | Professional & scientific | 2022 |
| Tringa Limited | Administrative & support | 1997 |
| Troman Transport Ltd | Transport & logistics | 2014 |
| Trophy Logistics Ltd | Transport & logistics | 2022 |
| True Blue Logistics Ltd | Transport & logistics | 2021 |
| True Style Talent Ltd | Professional & scientific | 2022 |
| Trux Recruitment Ltd | Administrative & support | 2026 |
| Tubby Catering Ltd | Hospitality | 2024 |
| Tugs for Sale and Charter Limited | Transport & logistics | 2020 |
| Tuktic Ltd | Other services | 2025 |
| Tulips Group Felixstowe CIC | Health & social care | 2025 |
| Tumble Dog Community Interest Company | Education | 2025 |
| Turkon Line (UK) Limited | Transport & logistics | 2002 |
| Turners Carpentry & Joinery Limited | Construction | 2005 |
| Twinkletoes Pre-School Limited | Education | 2003 |
| Two Red Birds Limited | Wholesale & retail | 2014 |
| Twoknight Psychology Ltd | Health & social care | 2023 |
| TYM Golf Ltd | Wholesale & retail | 2026 |
| Tyson Trucking Services Ltd | Transport & logistics | 2026 |
| UK Customs Solutions Ltd | Transport & logistics | 2014 |
| UK INK Cartridges Limited | Manufacturing | 2011 |
| Ukce Ltd | Administrative & support | 2019 |
| Underwood Hardware & DIY Ltd | Wholesale & retail | 2008 |
| Unforgettable Escapes Limited | Administrative & support | 2024 |
| Ursa Limited | Professional & scientific | 2001 |
| Uxerolf Ltd | Transport & logistics | 2025 |
| V S Nithin Ltd | Wholesale & retail | 2018 |
| Vagris Ltd | Transport & logistics | 2019 |
| Vanzzzitrans Ltd | Transport & logistics | 2024 |
| Varga Haulage Ltd | Transport & logistics | 2022 |
| Velocity Haulage Services Ltd | Transport & logistics | 2026 |
| Ventilation Fire Smoke Limited | Professional & scientific | 2020 |
| Veselina 2019 Ltd | Transport & logistics | 2019 |
| VFB Marketing Ltd | Information & communication | 2021 |
| Vgab Trans Ltd | Transport & logistics | 2026 |
| VIA Truck Ltd | Transport & logistics | 2025 |
| Victoria Paul Limited | Real estate | 1998 |
| Vikings Estate Agents Ltd | Real estate | 2018 |
| Villa Italia Holdings Limited | Real estate | 2024 |
| VIO H S Ltd | Other services | 2025 |
| VIP Cuts D Ltd | Other services | 2026 |
| Visaga Ltd | Transport & logistics | 2024 |
| Vivagraph Pictures Limited | Extraterritorial | 2008 |
| VMV Transport Ltd | Transport & logistics | 2025 |