| Station Kebab Ltd | Hospitality | 2025 |
| Steam Mill Close Management Company Limited | Other services | 2018 |
| Stillwater Management Limited | Agriculture & fishing | 2011 |
| Stomping Ground Theatre Limited | Education | 2005 |
| Stories of Place CIC | Education | 2025 |
| Storr Nordic Design Ltd | Information & communication | 2012 |
| Stour Culture CIC | Arts & recreation | 2024 |
| Stow Forge & Daughters Ltd | Other services | 2018 |
| Stow Forge Fabrications Limited | Manufacturing | 2006 |
| Strategia Nexus Ltd | Construction | 2025 |
| Strikeways Ltd | Hospitality | 2016 |
| Studio FID Ltd | Arts & recreation | 2024 |
| Studio IDA Limited | Professional & scientific | 2023 |
| Studio Verde Landscape Design Limited | Administrative & support | 2026 |
| Studio Verde Landscape Maintenance Limited | Administrative & support | 2026 |
| Subeo Limited | Manufacturing | 1999 |
| Suffolk Capital Limited | Real estate | 2019 |
| Suffolk Home Improvements Ltd | Construction | 2010 |
| Suffolk Timber Solutions Ltd | Wholesale & retail | 2025 |
| Summers Park Training Academy Ltd | Education | 2024 |
| Swift Currencies Limited | Administrative & support | 2018 |
| T a Bloomfield Limited | Financial services | 2024 |
| T&C HR Ltd | Administrative & support | 2016 |
| Teleport Games UK Ltd | Wholesale & retail | 2021 |
| Tendring Pet Cremation Ltd | Professional & scientific | 2017 |
| Tendring Tree Surgery Limited | Administrative & support | 2020 |
| Textrazor Ltd | Information & communication | 2013 |
| TFS Catering and Events Ltd | Hospitality | 2016 |
| THE Alchemist (Hair & Beauty) Ltd | Other services | 2020 |
| THE Brantham Bull Ltd | Hospitality | 2026 |
| THE Chelsea Print House Ltd | Other services | 2021 |
| THE Door Fitting Company Ltd | Manufacturing | 2025 |
| THE Driving Therapist Limited | Education | 2020 |
| THE Essex Midwife Ltd | Health & social care | 2019 |
| THE Gymnastics and Dance Academy Ltd. | Education | 2024 |
| THE International Jack UP Barge Operators' Association Limited | Education | 2011 |
| THE Krakening Ltd | Professional & scientific | 2020 |
| THE Mistley Masonic Hall Company Limited | Other services | 2001 |
| THE Nutritional Therapy Clinic Limited | Health & social care | 2007 |
| THE Nutritious Chef Limited | Health & social care | 2020 |
| THE Old Maltings (Freehold) Limited | Households | 2009 |
| THE Old Maltings (Manningtree) Limited | Households | 1988 |
| THE Ostrich Club Limited | Extraterritorial | 1996 |
| THE Paws Club Limited | Other services | 2025 |
| THE Pink Pamper BUS Ltd | Other services | 2025 |
| THE Property Guys Suffolk Ltd | Construction | 2025 |
| THE R&R Club Ltd | Other services | 2024 |
| THE Secularist Ltd | Information & communication | 2026 |
| THE Stour Store Limited | Wholesale & retail | 2022 |
| THE Survey Initiative Ltd | Administrative & support | 2012 |
| THE Two Sisters Properties Ltd | Real estate | 2022 |
| THE Venture Centre 2000 (Management) Co. Ltd | Arts & recreation | 1999 |
| THE Wooden Tea Room Ltd | Manufacturing | 2026 |
| Theia Interiors Limited | Professional & scientific | 2019 |
| Thomas Rayner Ltd | Education | 2026 |
| Tideshift Limited | Professional & scientific | 2024 |
| Tigerlily Landscapes Company (TLC) Ltd | Administrative & support | 2021 |
| TIM Herrett Limited | Mining & quarrying | 2000 |
| Titan Pump Services Limited | Other services | 2021 |
| TJ Hempstalls Limited | Professional & scientific | 2012 |
| TLC Property Refurbishment Ltd | Construction | 2025 |
| TM Welders Limited | Professional & scientific | 2023 |
| Tmmo Entertainment Limited | Arts & recreation | 2024 |
| Togs (Manningtree) Limited | Wholesale & retail | 1999 |
| Toleman Motorsport Limited | Extraterritorial | 2007 |
| Tortuga Group Ltd | Manufacturing | 2025 |
| Total FF Limited | Manufacturing | 2026 |
| Tripart Developments Limited | Real estate | 2015 |
| Turner Fabrication & Site Services Ltd | Manufacturing | 2023 |
| Two Lives Limited | Manufacturing | 2019 |
| TYM Traders Ltd | Wholesale & retail | 2021 |
| USB Flash Limited | Wholesale & retail | 2009 |
| V Copper Building S.E.1. Limited | Real estate | 2004 |
| Valley Financial Group Ltd | Financial services | 2019 |
| Valley Garden Supplies Limited | Manufacturing | 2004 |
| Valuebond Ltd | Wholesale & retail | 2024 |
| Vape Hemp Ltd | Other services | 2023 |
| Varega Ltd | Information & communication | 2007 |
| Vertex Heating & Renewables Ltd | Construction | 2026 |
| Vesta Automation Limited | Administrative & support | 2022 |
| Victory Freehold Management Limited | Households | 2019 |
| Vintage Dreams Wedding Car Motor Company Limited | Transport & logistics | 2026 |
| Vital Exercise Ltd | Arts & recreation | 2012 |
| Vital Express Limited | Wholesale & retail | 2026 |
| Vital GRP Ltd | Financial services | 2025 |
| Vital Manufacturing Limited | Manufacturing | 2026 |
| Vitavia Limited | Wholesale & retail | 2012 |
| Viventi Property Group LLP | | 2021 |
| Viventi Property Limited | Real estate | 2021 |
| VOX Barbarae Limited | Arts & recreation | 2010 |
| W J & J Garnham Caravan Park 2024 LLP | | 2024 |
| W J & J Garnham Caravan Park LLP | | 2021 |
| Waters Edge Accounting Limited | Professional & scientific | 2002 |
| Webelieve Media Limited | Information & communication | 2014 |
| Welcome to Your Best Ltd | Professional & scientific | 2025 |
| Well Red Properties Limited | Real estate | 2012 |
| WFS Media Ltd | Manufacturing | 2024 |
| What the Bluck Ltd | Information & communication | 2017 |
| Wheatley Consulting Group Limited | Professional & scientific | 2024 |
| Wheatley Productions Limited | Information & communication | 2004 |