| Sweeny Tech Solutions Ltd | Information & communication | 2025 |
| Swepko Ltd | Administrative & support | 2026 |
| Swift Maintenance Limited | Other services | 2022 |
| SYMBOL2 Limited | Administrative & support | 2002 |
| Syscon Installations Limited | Construction | 2002 |
| T H Renovations Ltd | Construction | 2023 |
| T J Palmer Ltd | Transport & logistics | 2013 |
| T KAY Flooring Limited | Construction | 2022 |
| T&G2 Limited | Administrative & support | 2015 |
| T&K Food Store Ltd | Wholesale & retail | 2022 |
| T.E. Collings Limited | Transport & logistics | 1948 |
| T5 Building Company Ltd | Construction | 2009 |
| Tailormade Escapes Travel Ltd | Administrative & support | 2024 |
| Take the Stage Buckinghamshire Ltd | Arts & recreation | 2023 |
| Take the Stage Essex Ltd | Arts & recreation | 2023 |
| Take the Stage Ltd | Arts & recreation | 2017 |
| Takeley Farming LLP | | 2009 |
| Takeover Sports Management Ltd | Arts & recreation | 2023 |
| Talisman & Co Investments Limited | Real estate | 2024 |
| Tangent Resources Ltd | Extraterritorial | 1990 |
| Tans Beauty Treatments Ltd | Information & communication | 2016 |
| Tantra Consulting Ltd | Professional & scientific | 2009 |
| Tanya Hill Coaching Limited | Professional & scientific | 2015 |
| Taplow International Ltd | Professional & scientific | 2013 |
| Tascaffoldingltd Ltd | Construction | 2026 |
| Tasito Despatch Ltd | Transport & logistics | 2021 |
| Task Peeble Ltd | Administrative & support | 2021 |
| Tastebuds Coffee Systems Limited | Hospitality | 2011 |
| TAW One Holdings Ltd | Professional & scientific | 2022 |
| Taxjd Limited | Professional & scientific | 2020 |
| Taylor & Jarvis (Architectural Ironmongers) Ltd | Wholesale & retail | 2001 |
| Taylor Farriery Ltd | Other services | 2024 |
| Taylor Reeves Recruitment Limited | Administrative & support | 2024 |
| Taylor'D Toys Limited | Wholesale & retail | 2025 |
| TB Plumbing & GAS Ltd | Construction | 2025 |
| TCI Mechanical & Fabrication Ltd | Professional & scientific | 2026 |
| TCM Tackle Ltd | Wholesale & retail | 2021 |
| Tcmw Ltd | Real estate | 2020 |
| TCS Validation Ltd | Manufacturing | 2025 |
| TDF Installations Limited | Construction | 2014 |
| TDY Trading Limited | Wholesale & retail | 2026 |
| Team Feel Good Limited | Health & social care | 2007 |
| Technical Holding Group Limited | Financial services | 2025 |
| Technology Recworks Limited | Other services | 2017 |
| TEK Recruit Limited | Administrative & support | 2023 |
| Tektonas Limited | Administrative & support | 1996 |
| Tenant Assistance Program Limited | Real estate | 2009 |
| Tepla Consulting Limited | Information & communication | 2018 |
| Terence P Stafford Ltd | Information & communication | 2019 |
| Terrier Medicare Ltd | Health & social care | 2022 |
| TH & Scribe International Limited | Information & communication | 2020 |
| Thai House Essex Limited | Hospitality | 2016 |
| Thames News Services Limited | Transport & logistics | 1977 |
| Thames Security Shredding Ltd | Administrative & support | 2006 |
| Thameside Mechanical Services Limited | Construction | 1994 |
| THE Acai House Ltd | Manufacturing | 2026 |
| THE Aces @ WAT Tyler Animal Care Ltd | Professional & scientific | 2025 |
| THE Aces Animal Canine Care Ltd | Professional & scientific | 2025 |
| THE Aces Fertility Clinic Ltd | Agriculture & fishing | 2023 |
| THE Aces Groomers Ltd | Wholesale & retail | 2023 |
| THE Aces Pet Supplies & Working Dogs Ltd | Wholesale & retail | 2023 |
| THE Aces Practice Ltd | Professional & scientific | 2023 |
| THE Agency Consulting Group Ltd | Financial services | 2025 |
| THE Antique Oak Flooring Company Limited | Administrative & support | 2002 |
| THE Arthritis Clinic Ltd | Health & social care | 2024 |
| THE Artisan Woodshed Limited | Manufacturing | 2025 |
| THE Aviary (Essex) Limited | Hospitality | 2022 |
| THE Bald Studio Ltd | Information & communication | 2025 |
| THE Bavarian Beer Company Ltd | Wholesale & retail | 2018 |
| THE BID Clinic Ltd | Professional & scientific | 2023 |
| THE Billericay Brickie Ltd | Construction | 2025 |
| THE Billericay Ltd | Hospitality | 2017 |
| THE Bincredibles Ltd | Administrative & support | 2025 |
| THE Binding Partnership Limited | Manufacturing | 2010 |
| THE Boatyard Restaurant Limited | Other services | 2019 |
| THE Bougie Barn Ltd | Manufacturing | 2022 |
| THE Bull Mews Management Company Limited | Households | 2016 |
| THE Burger Delivery Company Limited | Hospitality | 2020 |
| THE Cater Museum | Arts & recreation | 2013 |
| THE Chequers Inn Kettleburgh Ltd | Hospitality | 2026 |
| THE Companies Hub Ltd | Administrative & support | 2021 |
| THE Corporate Connection Partnership Limited | Administrative & support | 1996 |
| THE Craftworks Lead and Hard Metals Ltd | Construction | 2026 |
| THE Crystal Company Shop Ltd | Wholesale & retail | 2020 |
| THE Digital Lightbulb Ltd | Information & communication | 2021 |
| THE Early Years Accountant Limited | Professional & scientific | 2026 |
| THE Engraving People Limited | Administrative & support | 2016 |
| THE Essex RAW Company Limited | Wholesale & retail | 2025 |
| THE Event Stylists Ltd | Hospitality | 2024 |
| THE Flooring Centre (Essex) Limited | Construction | 2025 |
| THE Four CS Amigos Ltd | Real estate | 2025 |
| THE Front END Development Limited | Information & communication | 2017 |
| THE Garden Landscaping Company Limited | Administrative & support | 2004 |
| THE Garnett Property Group Limited | Real estate | 2024 |
| THE GAS Guide Ltd | Professional & scientific | 2026 |
| THE Gina Restaurant and Lounge Ltd | Hospitality | 2025 |
| THE Glass Factory Studio Ltd | Administrative & support | 2022 |
| THE Glasshouse Wellness & Weightloss Retreat Ltd | Administrative & support | 2017 |
| THE Grazing Buddha Ltd | Hospitality | 2021 |
| THE Hair Company (Brentwood) Limited | Other services | 2004 |