| THE Neuroinclusive Collective CIC | Health & social care | 2025 |
| THE New Crescent Group Ltd | Education | 2024 |
| THE Noble Daniel Limited | Information & communication | 2022 |
| THE One Stop Business Shop Limited | Administrative & support | 2000 |
| THE P & R Building Company Ltd | Construction | 2003 |
| THE Palm Practice Limited | Health & social care | 2010 |
| THE Paris Sports Co Ltd | Wholesale & retail | 2005 |
| THE Peacock Corporation Limited | Manufacturing | 1993 |
| THE Pheon Press Limited | Manufacturing | 1991 |
| THE Phlebotomy Trainer Ltd | Health & social care | 2024 |
| THE Phoenix Solutions GRP Limited | Administrative & support | 2020 |
| THE Phone Doctor Limited | Information & communication | 2006 |
| THE Pixel Hive Limited | Information & communication | 2007 |
| THE Pizza Guys Braintree Ltd | Hospitality | 2020 |
| THE Priory Unisex Hair Salon Limited | Other services | 2004 |
| THE Quiz Machine Company Limited | Arts & recreation | 2018 |
| THE Referencing Agency Limited | Administrative & support | 2003 |
| THE Retirement Planning Executive Limited | Professional & scientific | 1996 |
| THE Right Carpet Clean Limited | Other services | 2019 |
| THE Rising Sun Bar Limited | Hospitality | 2006 |
| THE Rural Community Council of Essex | Other services | 2002 |
| THE Ryder Project Ltd | Real estate | 2019 |
| THE S D Group Limited | Financial services | 2007 |
| THE Scents Vault Limited | Wholesale & retail | 2025 |
| THE Session Agency Ltd | Arts & recreation | 2016 |
| THE Shah Corp Ltd | Transport & logistics | 2012 |
| THE Smile Clinic (Colchester) Limited | Health & social care | 2005 |
| THE Smile Clinic Limited | Health & social care | 2005 |
| THE Spatial Design Partnership Ltd. | Administrative & support | 2002 |
| THE Stephen Ball Alcohol & Narcotic Detox Centre Ltd. | Health & social care | 1997 |
| THE Stroke and Wellness Foundation | Health & social care | 1996 |
| THE Structural Engineering & Design Consultancy Ltd | Professional & scientific | 2002 |
| THE Techmint Ltd | Information & communication | 2025 |
| THE Test Clinic Ltd | Other services | 2022 |
| THE Tibus Partnership LLP | | 2005 |
| THE Tonic Magazine Ltd | Information & communication | 2019 |
| THE Trailer Centre (Mersea) Ltd | Wholesale & retail | 2024 |
| THE Trichological Society Limited | Other services | 1999 |
| THE USD Services Ltd | Health & social care | 2022 |
| THE Veterinary Practice | | 2001 |
| THE Village Squire Limited | Other services | 2003 |
| THE Waltham Abbey Royal Gunpowder Mills Charitable Foundation Limited | Arts & recreation | 1997 |
| THE Waltham Abbey Royal Gunpowder Mills Company Limited | Arts & recreation | 1997 |
| THE Watchbase (UK) Ltd | Administrative & support | 2004 |
| THE Water Mains Operations Ltd | Construction | 2026 |
| THE Watkin Heating Company Limited | | 1961 |
| THE Wheel Hospital Limited | Wholesale & retail | 1994 |
| THE White Doves Company Limited | Other services | 1999 |
| THE Wicked North Limited | Information & communication | 2025 |
| Theatre Arts Action Trust | Arts & recreation | 1999 |
| Thebeast Ltd | Wholesale & retail | 2026 |
| Theirinastudio Ltd | Wholesale & retail | 2025 |
| Themissingpiece Ltd | Wholesale & retail | 2026 |
| Theodora's Kitchen Ltd | Hospitality | 2025 |
| Theolisa Ltd | Health & social care | 2020 |
| Theoreub Health Care Services Ltd | Health & social care | 2014 |
| Theresa Powney Limited | Real estate | 2006 |
| Thermoshield Window Services Limited | Water & waste | 1996 |
| Thermoshield Windows & Conservatories Limited | Construction | 1982 |
| Theurbandealership Ltd | Wholesale & retail | 2023 |
| Thevictorylook.Com Limited | Wholesale & retail | 2024 |
| Theydon Nominees Limited | Administrative & support | 1994 |
| Theydon Secretaries Limited | Administrative & support | 1994 |
| Think Action E-Commerce Ltd | Wholesale & retail | 2025 |
| Think Bright Group Ltd | Administrative & support | 2019 |
| Thirteen West Ltd | Professional & scientific | 2023 |
| This IS US NG Limited | Manufacturing | 2022 |
| This Way Forward in Business Limited | Extraterritorial | 2018 |
| THM Services Ltd | Other services | 2016 |
| Thomas & HO Services (U.K.) Limited | Hospitality | 1993 |
| Thomas Boers (UK) Limited | Transport & logistics | 1983 |
| Thomas Carpenter Camera Limited | Professional & scientific | 2021 |
| Thomas Edward Dixon & Company | | 1993 |
| Thomas James Interiors Limited | Construction | 2004 |
| Thompson Cooper Properties Ltd | Real estate | 2006 |
| Thompson Heating (2000) Limited | Construction | 2000 |
| Thornbury Refrigeration Ltd | Wholesale & retail | 2006 |
| Thorndon Park Golf Club,Limited | Arts & recreation | 1920 |
| Thorntonfm Ltd | Construction | 2026 |
| Thorpe Bay Marine Limited | Wholesale & retail | 2005 |
| Thorpe Install Ltd | Construction | 2004 |
| Three Stars Investments and Research Limited | Extraterritorial | 1997 |
| Thrift Farm Limited | Agriculture & fishing | 1957 |
| Thrushstar Properties Limited | Real estate | 1981 |
| Thryzzle Ltd | Wholesale & retail | 2024 |
| Thunder Woods Limited | Wholesale & retail | 2025 |
| Thunderbird Freight Group Limited | Financial services | 2023 |
| Thunderbird Freight Limited | Transport & logistics | 1991 |
| Thurrock Centre for Independent Living | Other services | 1999 |
| Thurrock Driving Agency Limited | Administrative & support | 1994 |
| Thurrock Garden Centre Limited | Wholesale & retail | 1978 |
| Thurrock Steel Limited | Manufacturing | 2006 |
| Ti-Zak Limited | Construction | 2005 |
| TIA Juliette Limited | Other services | 2022 |
| Tiamo Limited | Real estate | 2003 |
| Tianwang Trading Limited | Wholesale & retail | 2021 |
| Tibran Holdings Ltd | Financial services | 2022 |
| Ticktomas Limited | Manufacturing | 2006 |
| Tidal X Limited Limited | Information & communication | 2022 |
| Tidehill Limited | Construction | 2002 |