| T a Optical Ltd | Health & social care | 2015 |
| T Bailey Properties Ltd | Real estate | 2021 |
| T H Barber Ltd | Other services | 2018 |
| T I Compliance Consulting Limited | Professional & scientific | 2002 |
| T Logan GAS Services Ltd | Other services | 2017 |
| T Maguire & Co (Contractors) Ltd | Real estate | 2018 |
| T Nails 95 Shirley Limited | Other services | 2025 |
| T&H Projects Ltd | Professional & scientific | 2024 |
| T&I Consulting Ltd | Other services | 2016 |
| T&K Health Ltd | Health & social care | 2026 |
| T&M Tiles Limited | Administrative & support | 2015 |
| T&S Grocers Ltd | Wholesale & retail | 2024 |
| T. Tantra Joy Processes Limited | Other services | 2014 |
| T.A.R. Piling Limited | Construction | 2020 |
| T.C. Real Estate Ltd | Real estate | 2015 |
| T.J Construction & Property Maintenance Ltd | Administrative & support | 2018 |
| T.K.M. Management Services Limited | Professional & scientific | 2009 |
| T.Q. Refrigeration Limited | Other services | 2002 |
| T.R.S Tunnelling & Civils Ltd | Construction | 2022 |
| T2 Ventures Ltd | Real estate | 2020 |
| T40 Digital Ltd | Information & communication | 2020 |
| T7KAU Limited | Information & communication | 2019 |
| TA Financial Advice Limited | Financial services | 2016 |
| TAA Wealth Management Limited | Financial services | 2015 |
| Tachbrook Management Co Ltd | Households | 2004 |
| Tactical Change Partners Ltd | Professional & scientific | 2026 |
| TAG Homes and Properties Ltd | Real estate | 2023 |
| TAG Medical Services Limited | Health & social care | 2021 |
| Tagomics Ltd | Professional & scientific | 2020 |
| Tahini Kitchen Limited | Hospitality | 2019 |
| Tailor-Made Heating Services Limited | Construction | 2002 |
| Tailoring Studio Ltd | Other services | 2021 |
| Tailway Ltd | Construction | 2019 |
| Tainbrook Limited | Construction | 1980 |
| Tait's Christmas Decor Limited | Other services | 2020 |
| Tajtravel&Tours UK Limited | Administrative & support | 2018 |
| Take Flight Limited | Transport & logistics | 2019 |
| Take the Leed Ltd | Hospitality | 2019 |
| Talbot Developments Limited | Professional & scientific | 2026 |
| Talbot Hartlebury Management Company Limited | Households | 2019 |
| Talbot Mansions Ltd | Construction | 2021 |
| Talenius Business Consultancy Ltd | Professional & scientific | 2019 |
| Talent Management Group Limited | Information & communication | 2018 |
| Talent Pathway Solutions Limited | Arts & recreation | 2024 |
| Talentgen Limited | Professional & scientific | 2010 |
| Talentrarecruitment Ltd | Administrative & support | 2026 |
| Talia White Studios Ltd | Professional & scientific | 2023 |
| Talk Real Ltd | Manufacturing | 2019 |
| Tall Penguin Media Ltd | Information & communication | 2015 |
| Tallychart Limited | Financial services | 1987 |
| Tamarin Event Services Ltd | Professional & scientific | 2018 |
| Tamselsunreef Limited | Arts & recreation | 2024 |
| Tamworth Street Ltd | Hospitality | 2022 |
| Tangerine Talent UK Limited | Education | 2018 |
| Tangible Technologies Ltd | Information & communication | 2014 |
| Tangier Gardens Management Company Limited | Households | 2019 |
| Tangles and Tails Limited | Other services | 2021 |
| Tango Real Estate LLP | | 2011 |
| Tango Systems Ltd | Information & communication | 2014 |
| Tanner Holdings (Midlands) Ltd | Financial services | 2021 |
| Tanner Property Limited | Real estate | 2024 |
| Tanners Meadow (Strood Green) Management Company Limited | Households | 2021 |
| Tanwi Ltd | Education | 2024 |
| Tanworth Construction Limited | Construction | 2007 |
| Tanworth Garage Ltd | Wholesale & retail | 2021 |
| Tapas Catering Ltd | Hospitality | 2023 |
| Taped Midlands Ltd | Administrative & support | 2025 |
| Tapster Court Management Company Limited | Households | 1990 |
| TAR Piling (West Midlands) Limited | Construction | 2025 |
| Taranis Properties Limited | Real estate | 2024 |
| Tardis Storage Solutions Limited | Real estate | 2016 |
| Target Systems and Programming Holdings Limited | Information & communication | 2016 |
| Target Systems and Programming Limited | Information & communication | 1979 |
| Taron Consulting Limited | Professional & scientific | 2024 |
| Taru Technologies Ltd | Information & communication | 2024 |
| Tarver Associates Limited | Professional & scientific | 2019 |
| Tashany Ltd | Administrative & support | 2009 |
| Task Engineering Solutions Limited | Construction | 2018 |
| Taste Club Ltd | Wholesale & retail | 2025 |
| Taste Rental Ltd | Administrative & support | 2024 |
| Tasty Idea Ltd | Hospitality | 2017 |
| Tata Builders Limited | Construction | 2020 |
| TAU Structural Design Ltd | Professional & scientific | 2025 |
| Taurus Electrical Installations Limited | Other services | 2008 |
| Taurus Fitness Unit Ltd | Arts & recreation | 2018 |
| Taurus Mechanical Limited | Professional & scientific | 2024 |
| Taurus Properties Staffordshire Limited | Manufacturing | 2010 |
| Tawp Developments Limited | Construction | 2022 |
| Tax Accountants Ltd | Professional & scientific | 2002 |
| Tax Gate Limited | Professional & scientific | 2024 |
| Tax Sisters Ltd | Professional & scientific | 2021 |
| Taxlink Accountants Ltd | Professional & scientific | 2015 |
| Taxperts Accountants Limited | Professional & scientific | 2012 |
| TAY and Palmer Ltd | Real estate | 2023 |
| Taybar Security Ltd | Administrative & support | 2009 |
| Taylor James Associates Limited | Financial services | 2007 |
| Taylor James Property Management Ltd | Real estate | 2019 |
| Taylored Fitness Studio Ltd | Extraterritorial | 2020 |
| Taylors Independent Family Funeral Directors Limited | Other services | 2016 |
| Tayroc Limited | Wholesale & retail | 2014 |