| SWB Rentals Limited | Real estate | 2026 |
| SWB Sisters Holdings Limited | Financial services | 2026 |
| Swift Armour Security Ltd | Wholesale & retail | 2024 |
| Swift Building & Developments Limited | Construction | 2025 |
| Swift On-Site Services Limited | Manufacturing | 2025 |
| Swiss WW Ltd | Wholesale & retail | 2018 |
| SX Drones Ltd | Information & communication | 2018 |
| Synthenesis.Investments Ltd | Financial services | 2025 |
| System Training Method Ltd | Education | 2026 |
| Szoogs Limited | Real estate | 2025 |
| T and H Homes UK Ltd | Construction | 2026 |
| T J Claridge Limited | Other services | 2012 |
| T Langrish Property Ltd | Real estate | 2024 |
| T Marx Ltd | Professional & scientific | 2022 |
| T Turner Contracting Limited | Construction | 2010 |
| T.O.E (Trade OIL Equipment) Limited | Professional & scientific | 1994 |
| T1 Architecture Ltd | Professional & scientific | 2026 |
| Tabor Centre | Health & social care | 2004 |
| Tabor Construction Limited | Extraterritorial | 2013 |
| Tailored Wraps Ltd | Wholesale & retail | 2018 |
| Tailormade Resins Ltd | Construction | 2023 |
| Tailors of Essex Ltd | Manufacturing | 2025 |
| Talisman Consultancy Limited | Information & communication | 1996 |
| Talk Skin Academy Ltd | Education | 2024 |
| Tall Elms Limited | Transport & logistics | 2020 |
| Talloak Construction Ltd | Construction | 2026 |
| Talm Trading Ltd | Wholesale & retail | 2023 |
| Tamdown Group Limited | Construction | 1976 |
| Tamdown Plant Hire Limited | Administrative & support | 2000 |
| Tamdown Services Limited | Administrative & support | 1999 |
| TAN ME Wild Limited | Other services | 2025 |
| Tania Jenkinson Executive Coaching Ltd | Administrative & support | 2021 |
| Tanya Leeanne Limited | Professional & scientific | 2021 |
| Tapco (Preservation) Limited | Water & waste | 1972 |
| Tapco Homedry Limited | Extraterritorial | 2016 |
| Tapestry Court Limited | Households | 2021 |
| TAPS2TRAPS Limited | Wholesale & retail | 2017 |
| Tarius Holdings Limited | Financial services | 2019 |
| Tarn Mitchell Consultancy Ltd | Wholesale & retail | 2024 |
| Tarn Mitchell Group Ltd | Wholesale & retail | 2018 |
| Tarn Mitchell Property Limited | Real estate | 2023 |
| Taste of Nature Ltd | Wholesale & retail | 2026 |
| Tawny Port Limited | Real estate | 2014 |
| Taylor's Dance Company Ltd | Arts & recreation | 2023 |
| TBP Entertainment Ltd | Information & communication | 2024 |
| TBP Manufacturing Ltd | Manufacturing | 2024 |
| TBP Property Maintenance Ltd | Construction | 2024 |
| TC Equity Ltd | Real estate | 2025 |
| TC Essex Limited | Hospitality | 2022 |
| Tcdi Limited | Construction | 2009 |
| TCH Holdings Limited | Extraterritorial | 2015 |
| TCM Fencing Ltd | Administrative & support | 2013 |
| TDC Show Ltd | Arts & recreation | 2023 |
| Team on Form Ltd | Arts & recreation | 2019 |
| Team Rascals Ltd | Arts & recreation | 2021 |
| TEC Locksmith & Security Ltd | Construction | 2023 |
| Tecs Property Management Limited | Real estate | 2022 |
| Tecs Refurbishments Limited | Construction | 2024 |
| Tecs Resource Limited | Administrative & support | 2025 |
| Tecs Training Ltd | Other services | 2010 |
| TEESH07 Limited | Health & social care | 2016 |
| TEK Industrial Roofing Limited | Construction | 2024 |
| TEL Trading Ltd | Wholesale & retail | 2020 |
| Temimed Healthcare Ltd | Health & social care | 2019 |
| Temperleys Solutions Ltd | Hospitality | 2020 |
| Tempo Aluminium Ltd | Manufacturing | 2024 |
| Tempus Fugit Limited | Professional & scientific | 2011 |
| Terminal Network Ltd | Information & communication | 2020 |
| Tern Group Limited | Wholesale & retail | 2016 |
| Terry Turbo Ltd | Information & communication | 2017 |
| TES Training Limited | Extraterritorial | 2011 |
| Tessallation Limited | Information & communication | 2012 |
| TF Joinery Limited | Manufacturing | 2019 |
| Tfac Ltd | Extraterritorial | 2014 |
| TFG Online Ltd | Information & communication | 2020 |
| TFH Building Ltd | Construction | 2018 |
| TFL Property Ltd | Real estate | 2018 |
| TGS Photo Limited | Information & communication | 2016 |
| TGT JV1 Ltd | Construction | 2019 |
| Thao One Limited | Other services | 2023 |
| That Needed Services Ltd | Professional & scientific | 2024 |
| That Perfect Dress Limited | Manufacturing | 2020 |
| THE 19TH Roll Limited | Wholesale & retail | 2023 |
| THE Active Allies CIC | Education | 2026 |
| THE Amazing Tent Company Limited | Administrative & support | 2005 |
| THE Artists Rifles Association | Other services | 1948 |
| THE Asian Cookshop Limited | Wholesale & retail | 2010 |
| THE Assembly Events Group Limited | Information & communication | 2019 |
| THE Aurora Wellness Retreat Ltd | Other services | 2026 |
| THE Barn at Alswick Limited | Hospitality | 2014 |
| THE Bearded Developer Ltd | Information & communication | 2024 |
| THE Beauty Shortlist Limited | Information & communication | 2012 |
| THE Bell Essex Limited | Hospitality | 2016 |
| THE Bell LC Ltd | Hospitality | 2025 |
| THE Big Bear Cider Mill Limited | Manufacturing | 2015 |
| THE Blue EGG Great Bardfield Ltd | Wholesale & retail | 2024 |
| THE Braintree Chinese Takeaway | | 2002 |
| THE Brainwave Therapy Centre Limited | Health & social care | 2009 |
| THE Brand Partnership Ltd | Construction | 2024 |
| THE Building Bureau Ltd | Construction | 2022 |