| TAI ADE & Co Limited | Administrative & support | 2025 |
| Tailend Chasers Ltd | Information & communication | 2020 |
| Tailor Made Construction Limited | Construction | 2020 |
| Tails of Success Kent Ltd | Education | 2021 |
| TAJ Sandhar Ltd | Health & social care | 2023 |
| TAJ Virk Logistics Ltd | Transport & logistics | 2025 |
| Tajao Ltd | Wholesale & retail | 2020 |
| Takenoko Advisory Ltd | Professional & scientific | 2024 |
| Takest Properties Limited | Real estate | 2026 |
| Takk & Company Limited | Professional & scientific | 2005 |
| Takk and Company (Medway) Ltd | Professional & scientific | 2009 |
| Takk Properties Limited | Real estate | 2018 |
| Taks & Jhan Enterprise Ltd | Real estate | 2022 |
| TAL Rosner Limited | Information & communication | 2022 |
| Tal-Y-Fan Limited | Professional & scientific | 1951 |
| Talaska Wine UK Ltd | Wholesale & retail | 2025 |
| Talbot & Son's Ltd | Construction | 2019 |
| Talbot Court RTM Company Ltd | Households | 2026 |
| Talc Real Estate Limited | Real estate | 2017 |
| Talcual Ltd | Wholesale & retail | 2025 |
| Talent Shark Limited | Administrative & support | 2021 |
| Talent Showcase Africa Records Ltd | Arts & recreation | 2025 |
| Talkwebster Limited | Education | 2002 |
| Tallow Court (Management) Limited | Households | 2008 |
| Tamanbuild Limited | Construction | 2024 |
| Tamarindo Care Limited | Health & social care | 2009 |
| Tambay Ltd | Hospitality | 2022 |
| Tambookie Ltd | Construction | 2015 |
| Tameplace Contracts Ltd | Wholesale & retail | 2010 |
| Tamlan Investments Limited | Real estate | 2026 |
| Tams U.K. Limited | Manufacturing | 1992 |
| Tamstone Consulting Limited | Professional & scientific | 2018 |
| Tamstone Ltd | Wholesale & retail | 2021 |
| Tangible Ltd | Professional & scientific | 2015 |
| Tans Surrey Ltd | Wholesale & retail | 2019 |
| Tantastic Limited | Other services | 2017 |
| Tantonic Ltd | Wholesale & retail | 2026 |
| Tantons Tree Surgeons Limited | Agriculture & fishing | 2005 |
| Tanyard Lane Management Company Ltd | Households | 2018 |
| Tanz London (Pratts Bottom) Ltd | Other services | 2025 |
| Tanz London Group Ltd | Other services | 2025 |
| Tanzanite Construction Services Ltd | Construction | 2023 |
| TAP2WORK CIC | Information & communication | 2025 |
| Tapas Y OLE Limited | Hospitality | 2016 |
| Tara Bucknall Psychotherapy Ltd | Health & social care | 2020 |
| Tarafder Bari Ltd | Real estate | 2025 |
| Taran & SON Construction Ltd | Manufacturing | 2017 |
| Taray Estate (Bamford Point) Ltd | Real estate | 2020 |
| Taray Estates Limited | Real estate | 2016 |
| Target Business Centre (Parkwood) Management Company Limited | Real estate | 1989 |
| Target Farming LLP | | 2015 |
| Tarmon Consultants Limited | Construction | 2014 |
| Tarustrans Ltd | Transport & logistics | 2025 |
| Tashline Healthcare Ltd | Health & social care | 2026 |
| Tasico Limited | Wholesale & retail | 2024 |
| Tastebuddies Baby Ltd | Manufacturing | 2025 |
| Tasty Chicken Limited | Hospitality | 2012 |
| Tasty Tech Limited | Information & communication | 2013 |
| TAT16 Ltd | Transport & logistics | 2019 |
| Tatra Limited | Other services | 2005 |
| Tattoos by Tina Ltd | Arts & recreation | 2026 |
| Tautiss Ltd | Construction | 2026 |
| Tayiba Tandoori Ltd | Hospitality | 2024 |
| Taylor Group Estates Limited | Financial services | 2025 |
| Taylor Made Tennis Limited | Education | 2016 |
| Taylor Miles Accountancy Limited | Professional & scientific | 2018 |
| Taylored to YOU Limited | Health & social care | 2023 |
| Taylors Driving School Ltd | Education | 2023 |
| Taylors Driving Training Aids Ltd | Education | 2025 |
| TB & VOS Property Limited | Real estate | 2025 |
| TB Risk Consultancy Ltd | Professional & scientific | 2012 |
| TBH Waste Limited | Water & waste | 2024 |
| Tbig MGA Limited | Financial services | 2025 |
| Tbig Property Limited | Financial services | 2023 |
| Tbig Residential Limited | Financial services | 2022 |
| Tbig Retail 2 Limited | Financial services | 2025 |
| Tbig Retail Limited | Financial services | 2025 |
| Tbiggs Holdings Limited | Other services | 2017 |
| TBJ Holdings Limited | Financial services | 2023 |
| TBS360 Construction Ltd | Construction | 2018 |
| TC Accounting Solutions Limited | Professional & scientific | 2024 |
| TC Agri Ltd | Manufacturing | 2012 |
| TC Bast Solutions Ltd | Wholesale & retail | 2023 |
| Tc-Europe Ltd | Other services | 2020 |
| TCJ Compliance Ltd | Professional & scientific | 2024 |
| TCL Delivery Ltd | Transport & logistics | 2022 |
| TCM Building Services Ltd | Construction | 2019 |
| TCO Courier Ltd | Transport & logistics | 2019 |
| TCR Roofing Ltd | Construction | 2009 |
| Tcym Ltd | Wholesale & retail | 2025 |
| TD Baks Healthcare Ltd | Health & social care | 2021 |
| TDB Heating Ltd | Professional & scientific | 2019 |
| TDC Designs Ltd | Wholesale & retail | 2023 |
| Tdlo Holdings Limited | Financial services | 2024 |
| TDT Transport Ltd | Transport & logistics | 2021 |
| TDV Developments Limited | Construction | 2011 |
| Teach Lead Learn Ltd | Education | 2024 |
| Team Berry (UK) Limited | Agriculture & fishing | 2023 |
| Team Berry Limited | Agriculture & fishing | 2023 |
| Team Cherry Limited | Wholesale & retail | 2025 |