| Supersips UK Limited | Extraterritorial | 2015 |
| Surestone Limited | Real estate | 2021 |
| Surrender With Holly Ltd | Health & social care | 2024 |
| Sustainable Framsden CIC | Energy | 2022 |
| Sustainable Plant Store Limited | Other services | 2020 |
| Sweet Delites Cakesnmore Ltd | Manufacturing | 2026 |
| Swift Taxi Cabs Ltd | Transport & logistics | 2022 |
| Switch HV Ltd | Manufacturing | 2023 |
| SYM Consulting Services Limited | Information & communication | 2018 |
| Synergy Plumbing & Electrical Ltd | Other services | 2023 |
| Synogen Ltd | Information & communication | 2015 |
| System Electronics Ltd | Manufacturing | 2008 |
| T Brown Heating Solutions Limited | Construction | 2019 |
| T Mills Financial Limited | Financial services | 2016 |
| T Mills Property Investments Limited | Real estate | 2017 |
| T Mottram Ltd | Wholesale & retail | 2020 |
| T Workshop Ltd | Wholesale & retail | 2018 |
| T.H. & P.M. Baker Limited Partnership | | 2025 |
| T.P.S. (Tactical) Limited | Administrative & support | 2009 |
| T4 Survey Ltd | Construction | 2009 |
| Tack & Turnout Limited | Wholesale & retail | 2015 |
| TAG Engineering Limited | Professional & scientific | 2016 |
| Talbot Properties (Stowmarket) Limited | Real estate | 2006 |
| Talpa Shed Limited | Real estate | 2024 |
| Tanarez Limited | Real estate | 2010 |
| Tank Change Limited | Construction | 1999 |
| Tapiz Limited | Financial services | 2021 |
| Taproot TLC Limited | Administrative & support | 2025 |
| Target Property Investments Limited | Real estate | 2017 |
| Target Site Engineering & Surveys Limited | Construction | 2011 |
| Tarling Fencing Limited | Administrative & support | 2016 |
| Taste the Tempo Ltd | Wholesale & retail | 2026 |
| Taybro Property Limited | Real estate | 2016 |
| Taybrooke Limited | Financial services | 2019 |
| Taylor Commercials Limited | Wholesale & retail | 2008 |
| Taytproducts Ltd | Wholesale & retail | 2021 |
| TAZ Aviation Engineering Ltd | Manufacturing | 2015 |
| TCB Catering Ltd | Hospitality | 2024 |
| TCB Commerce Ltd | Wholesale & retail | 2023 |
| TCG Source Limited | Wholesale & retail | 2026 |
| TCH Plant Hire Ltd | Administrative & support | 2026 |
| Teatrolatino Limited | Arts & recreation | 2018 |
| Technical Delivery Services Ltd | Wholesale & retail | 2024 |
| Temple Property & Construction Limited | Construction | 2005 |
| Terrain Aeration Services Limited | Administrative & support | 2000 |
| Terry Aldis Limited | Construction | 2006 |
| Tessen Sports Services Ltd | Manufacturing | 2022 |
| THE Acorn Practice Ltd | Health & social care | 2024 |
| THE Affordable Plumber Ltd | Construction | 2014 |
| THE Assoc Management Company Limited | Professional & scientific | 2007 |
| THE Axia Bridge Limited | Administrative & support | 2026 |
| THE Brickyard Group Ltd | Wholesale & retail | 2021 |
| THE Calmer Group Ltd | Education | 2013 |
| THE Cedars Pantry Ltd | Wholesale & retail | 2019 |
| THE Cedars Woodbridge Management Company Limited | Households | 2016 |
| THE Coir Company Ltd | Wholesale & retail | 2024 |
| THE Cooking Experience Limited | Hospitality | 2002 |
| THE Deben Wire Company Limited | Manufacturing | 1995 |
| THE Debenham Lion Limited | Hospitality | 2021 |
| THE Debenham Office Ltd | Real estate | 2010 |
| THE Digital Talent Network Ltd | Administrative & support | 2012 |
| THE Dogs Business Ltd | Manufacturing | 2022 |
| THE Epic Centre Limited | Education | 2012 |
| THE Flower Workshop Suffolk Ltd | Wholesale & retail | 2024 |
| THE Forge Community Church | Other services | 2003 |
| THE Grooming POD Ltd | Other services | 2025 |
| THE Growth Shed Limited | Professional & scientific | 2026 |
| THE Hair Sanctuary (Rendlesham) Limited | Other services | 2005 |
| THE Happy Huts Limited | Hospitality | 2021 |
| THE Harris Cabinet Co Ltd | Construction | 2019 |
| THE Hogs Kiss Limited | Hospitality | 2023 |
| THE Home Entertainment Network Ltd | Information & communication | 2000 |
| THE Insurance Community Ltd | Information & communication | 2021 |
| THE Knight Partnership Ltd | Professional & scientific | 2022 |
| THE Lads Lounge Stowmarket Ltd | Other services | 2024 |
| THE Little Big Catering Company Limited | Hospitality | 2017 |
| THE Little Swan Prints Ltd | Manufacturing | 2022 |
| THE London Sock Exchange Limited | Arts & recreation | 2013 |
| THE Maldives Group Limited | Administrative & support | 2026 |
| THE Mill House Cattery Limited | Other services | 2008 |
| THE MIX Stowmarket Ltd | Other services | 2012 |
| THE Model Forge Ltd | Information & communication | 2025 |
| THE Motorcycle Shed Limited | Wholesale & retail | 2019 |
| THE Nest Ipswich Way Limited | Extraterritorial | 1988 |
| THE Online Wine Shop Ltd | Wholesale & retail | 2024 |
| THE Open Cage Limited | Professional & scientific | 2016 |
| THE Orchard Gate (North Lopham) Residents Management Company Limited | Households | 2022 |
| THE Orchards Residents' Management Company Limited | Professional & scientific | 2006 |
| THE Osiers Management Co Limited | Real estate | 2005 |
| THE Pahus (Public Arts Health & US) CIC | Professional & scientific | 2021 |
| THE People’S Admin and Consultancy Ltd | Professional & scientific | 2025 |
| THE Personalised Ribbon Company Ltd | Wholesale & retail | 2009 |
| THE Pet Guru Ltd | Manufacturing | 2023 |
| THE Pickle House Limited | Manufacturing | 2017 |
| THE Queen B Catering Co. Ltd | Hospitality | 2021 |
| THE Really Nice Valeting Company Limited | Administrative & support | 2024 |
| THE Red White Group Ltd Ltd | Hospitality | 2025 |
| THE Roth Partnership Limited | Agriculture & fishing | 2022 |
| THE Sack Filling and Robot Palletising Company Ltd | Wholesale & retail | 2011 |
| THE Salon Elmswell Limited | Other services | 2022 |