| Swedweb Limited | Information & communication | 2023 |
| Sweeneyuk Ltd | Construction | 2017 |
| Sweet Choice Lounge Ltd | Hospitality | 2023 |
| Swift Advertising Solutions Ltd | Professional & scientific | 2011 |
| Swift Alloy Wheels Ltd | Wholesale & retail | 2024 |
| Swiftlogic Solutions Limited | Information & communication | 2025 |
| Swiftpool Services Limited | Administrative & support | 1999 |
| Swingplane Perfector 2 Limited | Manufacturing | 2025 |
| SX Electrical Ltd | Construction | 2015 |
| SX Homes Limited | Real estate | 2016 |
| Sygma Accountants Limited | Professional & scientific | 2017 |
| Sygma Financial Services Ltd | Financial services | 2023 |
| System Five Controls Limited | Information & communication | 2004 |
| System Five Services Limited | Construction | 2006 |
| System Installation Services Ltd. | Information & communication | 2003 |
| Systems I.D. Limited | Information & communication | 1996 |
| Systemstraders Ltd | Information & communication | 2020 |
| T & J Group Limited | Administrative & support | 2017 |
| T & K Flooring Services Limited | Construction | 2002 |
| T C Interiors Essex Ltd | Manufacturing | 2013 |
| T F & J UK Limited | Health & social care | 2019 |
| T J Hammond Transport Limited | Transport & logistics | 2002 |
| T Punt Holdings Limited | Real estate | 2024 |
| T. W. LEE & SON Limited | Construction | 2001 |
| T.C.Paving&Landscape Services Ltd | Construction | 2015 |
| T.D.R Formwork (Essex) Limited | Construction | 2011 |
| T.N.C. Precision Engineering Limited | Manufacturing | 1988 |
| T123 WJB Plumbing and Heating Ltd | Construction | 2021 |
| Tabrums Professional Services Limited | Professional & scientific | 2011 |
| Talentconnect Ltd | Administrative & support | 2025 |
| Talentknight Limited | Information & communication | 2025 |
| Tamar Electrical Solutions Limited | Manufacturing | 2011 |
| Tamaris Electrical Limited | Construction | 2009 |
| Tamaris Food Ltd | Hospitality | 2019 |
| Tamaris Properties Ltd | Real estate | 2022 |
| Tamaris Roofing Ltd | Construction | 2018 |
| Tana Debimpe Ltd. | Extraterritorial | 2015 |
| Tanner Skip Hire Limited | Extraterritorial | 2012 |
| TAP Essex Limited | Professional & scientific | 2014 |
| Taylor & Taylor Contracting Ltd | Professional & scientific | 2018 |
| Taylor Automotive Design Engineering Services Ltd | Professional & scientific | 2019 |
| Taylor Estates (Suffolk) Limited | Real estate | 2005 |
| TB Transport Consultant Ltd | Transport & logistics | 2022 |
| Tbcm Interiors Ltd | Construction | 2021 |
| Tcbc South Limited | Wholesale & retail | 2024 |
| Teamfridge Coaching Ltd | Education | 2022 |
| Tecdata Ltd | Information & communication | 2013 |
| TECH2 Partners Ltd | Administrative & support | 2023 |
| Technologia Incipe Ltd | Professional & scientific | 2025 |
| Technology Desking Limited | Manufacturing | 1992 |
| Technology Desking Trustee Limited | Financial services | 2024 |
| TEG Driver Solutions Ltd | Administrative & support | 2017 |
| Tempered Peach Ltd | Manufacturing | 2020 |
| Temple Building Construction Limited | Construction | 2020 |
| Tenderil IT Limited | Information & communication | 2014 |
| Terlings Financial Ltd | Financial services | 2017 |
| Terminus Capital Ventures Limited | Real estate | 2024 |
| Terzetta Ltd | Wholesale & retail | 2024 |
| Tesoro Globe Ltd | Wholesale & retail | 2022 |
| Tetra Scene of Crime International Limited | Wholesale & retail | 2016 |
| Texarkana Limited | Information & communication | 2018 |
| TEZ Marin UK Boat International Limited | Administrative & support | 2007 |
| TH Commercial Management Ltd | Extraterritorial | 2020 |
| Thackeray ROW 1971 Limited | Extraterritorial | 2014 |
| Thames Asphalt Limited | Construction | 1987 |
| That Girl With a Camera Limited | Professional & scientific | 2025 |
| Thaxmoor Ltd | Wholesale & retail | 2007 |
| THD Estates Limited | Real estate | 2024 |
| THE Abbeyfield Basildon Society Limited | Health & social care | 1971 |
| THE AC Guys Ltd | Energy | 2021 |
| THE Accountancy Practice (Essex) Limited | Professional & scientific | 2000 |
| THE Anglo European Clinic Limited | Health & social care | 2008 |
| THE ARK (Essex) Ltd | Other services | 2016 |
| THE Bank of Knowledge Limited | Information & communication | 2023 |
| THE Beauty Workforce Ltd | Administrative & support | 2016 |
| THE Beech Practice Ltd | Health & social care | 2023 |
| THE Bell Hotel Limited | Real estate | 2008 |
| THE Bespoke Flooring Company Ltd | Wholesale & retail | 2011 |
| THE Box Room Board Game Cafe Ltd | Hospitality | 2021 |
| THE Breakfast Room Ltd | Hospitality | 2013 |
| THE British Millinery Association CIC | Administrative & support | 2022 |
| THE Bungalow Nursery Limited | Wholesale & retail | 2022 |
| THE Cake Cauldron Limited | Manufacturing | 2024 |
| THE Canine Enrichment Company Ltd | Wholesale & retail | 2022 |
| THE Carpentry Company Limited | Construction | 2015 |
| THE China Brush Company Limited | Wholesale & retail | 2003 |
| THE CIO Masterclass Club Limited | Administrative & support | 2025 |
| THE Cliff PUB Limited | Hospitality | 2012 |
| THE Cloud WIZ Consultancy Ltd | Other services | 2017 |
| THE Cooler Company (Midlands) Limited | Water & waste | 2003 |
| THE Cosmedic House Ltd | Health & social care | 2021 |
| THE Counselling Café Limited | Education | 2024 |
| THE Creativity Hub Escapes Limited | Arts & recreation | 2022 |
| THE Creativity Hub Limited | Arts & recreation | 2018 |
| THE Creativity Hub Vintage Limited | Arts & recreation | 2022 |
| THE Crown Nail Company Limited | Manufacturing | 2016 |
| THE Dale Landscapes Battlesbridge Limited | Administrative & support | 2019 |
| THE Edge Property Group Ltd | Real estate | 2017 |
| THE Elms Nursery and Garden Centre Limited | Wholesale & retail | 2003 |
| THE Energy Network Ltd. | Professional & scientific | 1995 |