| THE Sticker Factory Ltd | Extraterritorial | 2020 |
| THE Wicked Cake Company UK Limited | Extraterritorial | 1999 |
| THE Wright Buy Holdings Limited | Financial services | 2015 |
| THE Wright Buy Ltd | Wholesale & retail | 2009 |
| Theluxurygarden Ltd | Wholesale & retail | 2024 |
| Theneverpress Limited | Information & communication | 2012 |
| Thesis Business Growth Limited | Professional & scientific | 2020 |
| Thomasxr Ltd | Information & communication | 2025 |
| Thomson Mainland Limited | Construction | 2021 |
| Three Five Limited | Construction | 2003 |
| Thrive Hub Haverhill Ltd | Health & social care | 2022 |
| Thronmoor Services Ltd | Construction | 2000 |
| Thule Holding Limited | Professional & scientific | 2004 |
| Thule Outdoor Limited | Wholesale & retail | 1996 |
| Thunders Sales NET Limited | Wholesale & retail | 2017 |
| Thurlow Estate Farms Limited | Agriculture & fishing | 2009 |
| Thurlow Estate Management Limited | Professional & scientific | 2008 |
| Tiegr Foundation CIC | Education | 2025 |
| Tigermoth Investments Limited | Real estate | 2021 |
| Tijama Ltd | Real estate | 2025 |
| TIM Rushton Farriers Limited | Other services | 2016 |
| Time Touch Ltd | Construction | 2026 |
| Timeline Business Investments Limited | Administrative & support | 2012 |
| Tircavu Ltd | Health & social care | 2016 |
| Tivoli Estates Limited | Construction | 2020 |
| TJ Dwellings Limited | Real estate | 2015 |
| TJC Business Services Limited | Professional & scientific | 2006 |
| TJC Integrated Solutions Ltd | Professional & scientific | 2026 |
| TNP National Services Ltd | Professional & scientific | 2025 |
| Tony Weston Limited | Health & social care | 2017 |
| Totally Internet Limited | Information & communication | 2018 |
| Townend Close Property Management Limited | Households | 2005 |
| Trading Spaces (Portable Accommodation) Limited | Other services | 2007 |
| Tranquillity Beauty Salon Limited | Other services | 2011 |
| Transcend Services Ltd | Health & social care | 2015 |
| Translinker Ltd | Transport & logistics | 2025 |
| Traxx Industries Limited | Professional & scientific | 2010 |
| Treflex Care Ltd | Health & social care | 2020 |
| Truedots Ltd | Wholesale & retail | 2026 |
| Trustflow Limited | Financial services | 2023 |
| Trxpro Limited | Extraterritorial | 2024 |
| Tuga Property Ltd | Real estate | 2023 |
| TW Easyday Ltd | Administrative & support | 2019 |
| Tysons Floors Limited | Construction | 2006 |
| Ty’S Garden Maintenance Ltd | Transport & logistics | 2022 |
| U.G.J. Haylock & Sons Limited | Agriculture & fishing | 1964 |
| Ubique Consultancy Services Limited | Professional & scientific | 2023 |
| Ubique Training Services Limited | Professional & scientific | 2025 |
| Ud.Pristine Ltd | Health & social care | 2022 |
| UK Football Consulting Ltd. | Administrative & support | 2019 |
| UK Football Group Limited | Arts & recreation | 2022 |
| UK Football Schools Ltd | Education | 2018 |
| UK Football Trials Limited | Arts & recreation | 2010 |
| UK PSF Limited | Arts & recreation | 2020 |
| UK Student Support Ltd | Education | 2014 |
| Ultra Precision Ltd | Manufacturing | 2009 |
| Uncle Connor's Diner Ltd | Hospitality | 2025 |
| Uncle Connors Ltd | Hospitality | 2025 |
| Unitec Computer Services Limited | Information & communication | 2003 |
| United Kingdom Homes Ltd | Other services | 2018 |
| Unity Schools Partnership | Education | 2010 |
| Unity Schools Partnership Education Ltd | Education | 2020 |
| Unwin Ventures Limited | Real estate | 2019 |
| Upcurve Consulting Ltd | Professional & scientific | 2025 |
| Urban Picnic Limited | Extraterritorial | 2011 |
| Vald Method Construction Ltd | Construction | 2024 |
| Vanifi Ltd | Wholesale & retail | 2022 |
| Varu ADI Ltd | Transport & logistics | 2011 |
| Varvara Ltd | Administrative & support | 2024 |
| Vedartha Accountants Ltd | Professional & scientific | 2026 |
| Vedartha Limited | Real estate | 2025 |
| Victlc Ltd | Transport & logistics | 2022 |
| View & Seam Ltd | Other services | 2024 |
| Vine FX Group Ltd | Financial services | 2026 |
| Vine FX Ltd | Information & communication | 2014 |
| Vine FX Manchester Ltd | Information & communication | 2026 |
| Violeta Sugaring Ltd | Wholesale & retail | 2025 |
| Violettas Secret Ltd | Wholesale & retail | 2023 |
| Visana Investment Limited | Real estate | 2023 |
| Vision Drylining Ltd | Construction | 2023 |
| Vital Staff & Training Solutions Ltd | Education | 2019 |
| VNU Recruitment Ltd | Administrative & support | 2026 |
| VP Catering Ltd | Extraterritorial | 2020 |
| W. R. Suckling and Sons Ltd | Agriculture & fishing | 2024 |
| Waddup Windows Limited | Construction | 2002 |
| Wadman Limited | Construction | 2001 |
| Wainward Homes Limited | Construction | 1999 |
| Waltons Renewables Limited | Administrative & support | 2013 |
| Watfeh Properties Ltd | Real estate | 2017 |
| Wattin Limited | Hospitality | 2024 |
| WE DO Signs & Labels Ltd | Other services | 2013 |
| Weavers Business Centre Ltd | Real estate | 2007 |
| Webbs Wonderful World of Cleaning Limited | Administrative & support | 2026 |
| Wells Plumbing & Heating Solutions Ltd | Construction | 2024 |
| West END Manse Dental Care Ltd | Health & social care | 2025 |
| Westrope Motors (Haverhill) Limited | Wholesale & retail | 1982 |
| Westward Mortgages Ltd | Financial services | 2026 |
| Wettec Plumbing & Heating Limited | Construction | 2018 |
| Wheel Chase Management Ltd | Administrative & support | 2016 |
| White Orchard Building Consultants Limited | Construction | 2026 |