| Systemicare Limited | Health & social care | 2023 |
| T & P Services Ltd | Financial services | 2026 |
| T L B Building & Landscaping Ltd | Professional & scientific | 2018 |
| T&S Roofing Essex Ltd | Construction | 2025 |
| T'S Treats Ltd | Hospitality | 2023 |
| Tacc Rigging Services Ltd | Information & communication | 2014 |
| Tailored Mortgage Advice Ltd | Financial services | 2017 |
| Talking Time UK Limited | Wholesale & retail | 2021 |
| TAM CNC Ltd | Information & communication | 2026 |
| Tamall Freehold Investments Limited | Real estate | 2017 |
| Tamall Investments Limited | Real estate | 2016 |
| TANDIRLI27 Limited | Hospitality | 2026 |
| Target Security Ltd | Administrative & support | 2018 |
| Target Zero Consultants Limited | Information & communication | 2016 |
| Target Zero Group Ltd | Financial services | 2018 |
| Target Zero Training Ltd | Administrative & support | 2017 |
| Tarodine Ltd | Real estate | 2015 |
| Tastebuds Vending Limited | Wholesale & retail | 2002 |
| Taylor Design Engineering Limited | Administrative & support | 2002 |
| TC Phillips Payroll Services Limited | Professional & scientific | 2026 |
| TCK Therapeutic & Assessment Services Ltd | Health & social care | 2020 |
| TDC Accountancy Ltd | Professional & scientific | 2019 |
| TDJ Electrical Services Limited | Construction | 2007 |
| Tea Cakes and Chat C.I.C. | Other services | 2025 |
| Team on TAP Ltd | Professional & scientific | 2023 |
| Team Spicer Management Limited | Professional & scientific | 2025 |
| Teazi Labs Ltd | Information & communication | 2022 |
| TEC Electrical Solutions Limited | Construction | 2021 |
| Tech Logistics IT Consultancy Ltd | Information & communication | 2019 |
| Techconcept Ltd | Construction | 2023 |
| Technical Cyber Limited | Administrative & support | 2019 |
| Technical Voice Limited | Professional & scientific | 2003 |
| Techraseal Ltd | Construction | 2017 |
| Techtonic London Ltd | Information & communication | 2014 |
| Tekforia Ltd | Wholesale & retail | 2025 |
| Telton Developments (Priory Close) Ltd | Construction | 2020 |
| Telton Developments Ltd | Construction | 2019 |
| Tenzor Consulting Limited | Professional & scientific | 2025 |
| Terence Vanner Associates Limited | Professional & scientific | 2021 |
| TGB Building Management Services Ltd | Construction | 2018 |
| TGC Consultancy Ltd | Construction | 2022 |
| Thames Chase Enterprises Limited | Professional & scientific | 2006 |
| Thames Slipways Ltd | Manufacturing | 2024 |
| THE Barford Education Academy | Education | 2005 |
| THE Beanery Limited | Hospitality | 2023 |
| THE Beauty Spot by Laura Limited | Other services | 2022 |
| THE Beauty Wish List Limited | Other services | 2012 |
| THE Boiler Installation Specialists Ltd | Construction | 2008 |
| THE BOW Candle Co Ltd | Wholesale & retail | 2023 |
| THE Brutal Truth Ltd | Wholesale & retail | 2022 |
| THE Coopers' Company and Coborn School | Education | 2011 |
| THE English Auberge Company Limited | Real estate | 2003 |
| THE Equanimity Practice Ltd | Health & social care | 2023 |
| THE Farcar Group Ltd | Other services | 2021 |
| THE Fish Shop Essex Limited | Wholesale & retail | 2023 |
| THE Flowering GEM Ltd | Arts & recreation | 2025 |
| THE Fête Lounge Limited | Hospitality | 2015 |
| THE Glass House Retreat Limited | Hospitality | 2019 |
| THE Help Deck Ltd | Health & social care | 2025 |
| THE Herrett Flooring Company Ltd | Construction | 2017 |
| THE Hollies (Upminster) Management Company Limited | Households | 1999 |
| THE Holmes Care (Group) Limited | Professional & scientific | 2006 |
| THE Honey Comb by Jorden Ltd | Other services | 2024 |
| THE Kids Media Club LLP | | 2024 |
| THE Little Psychology Co. UK Ltd | Health & social care | 2021 |
| THE Luxe Co. Personalised Travel by Kelly Gull Limited | Administrative & support | 2025 |
| THE Moho OT Ltd | Health & social care | 2021 |
| THE Muscle Market Upminster Ltd | Wholesale & retail | 2025 |
| THE Oak Residential Homes Limited | Health & social care | 2003 |
| THE Oaks Residential Home Limited | Extraterritorial | 2017 |
| THE Organic Skin Store Ltd | Administrative & support | 2008 |
| THE Outdoor Classroom Education Company Limited | Education | 2017 |
| THE Pantry Maid Ltd | Hospitality | 2011 |
| THE Photo Printery Ltd | Administrative & support | 2023 |
| THE Railway Children Gidea Park Nursery 2 Ltd | Education | 2025 |
| THE Railway Children Upminster 2 Ltd | Education | 2024 |
| THE Railway Children Upminster Ltd | Health & social care | 2021 |
| THE Reed Marketing Hub Limited | Professional & scientific | 2018 |
| THE Retail Review Consultancy Ltd | Arts & recreation | 2025 |
| THE Safety Expert Training Ltd | Education | 2022 |
| THE Sexy Property Company Ltd | Real estate | 2019 |
| THE Slow Dough Pizza Co. Limited | Hospitality | 2017 |
| THE Table 23 Ltd | Hospitality | 2026 |
| THE Training Borough Limited | Extraterritorial | 2022 |
| THE UP Construction Consultancy Limited | Construction | 2015 |
| THE Vanilla Room Trustee Limited | Financial services | 2026 |
| THE Vapers Choice (Upminster) Ltd | Manufacturing | 2023 |
| THE85 Ltd | Extraterritorial | 2022 |
| Theblackcompany Ltd | Construction | 2019 |
| Theydon Barn Hot Yoga Ltd | Arts & recreation | 2024 |
| Thomas Mcnicholl and Sons Ltd | Administrative & support | 2026 |
| Thompson Duffy Consulting Limited | Professional & scientific | 2019 |
| Thorne Family Investments Ltd | Financial services | 2024 |
| Thought Pattern Studio Ltd | Professional & scientific | 2025 |
| Thousand Words Limited | Information & communication | 2013 |
| Three Grey Monkeys Limited | Information & communication | 2014 |
| Thrive Health Hubs Limited | Health & social care | 2014 |
| Thurrock Health Hubs Diagnostics Limited | Administrative & support | 2024 |
| Tifany Record Ltd | Hospitality | 2024 |
| Tiger MAC Properties Limited | Real estate | 2024 |