| T&N Hood Investments Ltd | Real estate | 2026 |
| T-Pad Consulting Limited | Extraterritorial | 2007 |
| T.D.H. Exhibitions Limited | Administrative & support | 1999 |
| T.J. Hunt Contracting Limited | Administrative & support | 1986 |
| T207 Silver Street Leeds Ltd | Real estate | 2023 |
| Tabernacle Training & Consultancy Limited | Other services | 2025 |
| Tabitharose Ltd | Wholesale & retail | 2024 |
| Tachmed Community Healthcare Ltd | Public administration | 2024 |
| Tachmed Healthcare Ltd | Health & social care | 2018 |
| Tachmed Holdings Limited | Public administration | 2018 |
| Tadworth Developments Ltd | Construction | 2009 |
| TAI CHI Guildford Limited | Health & social care | 2019 |
| Tailored Finance & Accounting Ltd | Professional & scientific | 2024 |
| Tailored Tails Ltd | Other services | 2023 |
| Tajl Industries Ltd | Professional & scientific | 2023 |
| Take One Step Limited | Professional & scientific | 2022 |
| TAL Build Ltd | Construction | 2024 |
| Talent Point Ltd | Administrative & support | 2022 |
| Talent Tree Coaching Ltd | Professional & scientific | 2019 |
| Talenttech Development Limited | Professional & scientific | 2024 |
| Talking Leaders Ltd | Information & communication | 2012 |
| Tall Order Equipment Sales Limited | Information & communication | 1992 |
| Taller Design Ltd | Administrative & support | 2016 |
| Talogy Holdings Limited | Professional & scientific | 1999 |
| Talogy International Holdings Limited | Administrative & support | 2016 |
| Talogy Limited | Information & communication | 1999 |
| Talogy Talent Measurement Limited | Professional & scientific | 1987 |
| Talogy Talent Solutions Limited | Administrative & support | 2002 |
| Talon Advisors Ltd | Professional & scientific | 2024 |
| Talon Capital Ltd | Financial services | 2024 |
| Tamarisk UK Ltd | Real estate | 2008 |
| Tamerton Square Residents Association Limited | Households | 1982 |
| Tamsin Williams Limited | Professional & scientific | 2014 |
| Tande Development Projects Ltd | Real estate | 2016 |
| Tangley Consultants Limited | Information & communication | 1999 |
| Tangley Fields Management Company Limited | Households | 1999 |
| Tangley Lane Guildford LP | | 2016 |
| Tango Victor Limited | Transport & logistics | 2008 |
| Tanner Construction Ltd | Construction | 2019 |
| Tante Marie IP Limited | Administrative & support | 2020 |
| Tantrum Guildford Ltd | Other services | 2023 |
| Tanya Sisson Limited | Professional & scientific | 2015 |
| TAO1 Ltd | Professional & scientific | 2023 |
| TAP (UK) Consulting Ltd | Professional & scientific | 2014 |
| Tapearson Plumbing & Heating Ltd | Construction | 2022 |
| Tapin.Ai Ltd | Professional & scientific | 2024 |
| Tardee Ltd | Health & social care | 2022 |
| Target Pilates Ltd | Education | 2015 |
| Targus Europe Limited | Wholesale & retail | 1983 |
| Targus Group (UK) Limited | Professional & scientific | 1994 |
| Targus International Holdco (UK) Limited | Administrative & support | 2010 |
| Tarus AI Limited | Information & communication | 2025 |
| Taschar Limited | Professional & scientific | 2021 |
| Tate Electrical Services Limited | Construction | 2016 |
| Taurus Developments and Investments Ltd | Real estate | 2021 |
| Taurus Developments Limited | Real estate | 2007 |
| Taurus Wines Limited | Wholesale & retail | 2001 |
| Tawstock Limited | Real estate | 2014 |
| Tax Network Group Limited | Financial services | 2024 |
| Taxi Meter Sales Limited | Wholesale & retail | 2014 |
| Taxmates Limited | Professional & scientific | 1987 |
| Taygal Limited | Professional & scientific | 2026 |
| Tayler Reid Limited | Administrative & support | 1991 |
| Taylor Made AV Limited | Wholesale & retail | 2020 |
| Taylormade Building Services Limited | Construction | 2018 |
| TB AI Solutions Ltd | Professional & scientific | 2024 |
| TB Carpentry & Roofing Ltd | Manufacturing | 2024 |
| TC MED Holdings Ltd | Extraterritorial | 2022 |
| TCG Event Group Ltd | Arts & recreation | 2026 |
| TCS UK Corp Limited | Wholesale & retail | 2025 |
| TD Transition Limited | Other services | 2016 |
| Tdata Consulting Limited | Information & communication | 2023 |
| Tdcuk Ltd. | Health & social care | 2022 |
| TDR Enterprises Holdings Limited | Financial services | 2013 |
| TDR Enterprises Ltd | Professional & scientific | 2011 |
| TDR Property Investments Limited | Real estate | 2013 |
| Tea Time for Workshop Ltd. | Extraterritorial | 2014 |
| Teak Grove Limited | Real estate | 2022 |
| Team Legal Limited | Professional & scientific | 2014 |
| Team Recruitment Network Ltd | Other services | 2020 |
| Teamscreen Limited | Extraterritorial | 2018 |
| Techdow Pharma England Limited | Wholesale & retail | 2016 |
| Techfor Energy Limited | Energy | 2009 |
| Techhorizon Consulting Limited | Information & communication | 2024 |
| Technaron Engineering Services Ltd | Information & communication | 2024 |
| Technical & General Services Limited | Arts & recreation | 1984 |
| Technical Department Holdings EOT Limited | Professional & scientific | 2024 |
| Technical Department Holdings Limited | Financial services | 2024 |
| Technical Mains Hire Limited | Administrative & support | 2000 |
| Technics Group Limited | Construction | 1999 |
| Technoil Engineering Ltd | Professional & scientific | 2011 |
| Technology Risk Limited | Information & communication | 2018 |
| Technology Service Solutions Limited | Information & communication | 2013 |
| Techtelligent Limited | Information & communication | 2024 |
| Tedder Works Limited | Administrative & support | 2023 |
| Teddington 2 Limited | Administrative & support | 2009 |
| Teddington 3 Limited | Professional & scientific | 2015 |
| Tegn Limited | Arts & recreation | 2009 |
| Telcoapi Limited | Extraterritorial | 2013 |
| Teleplus Limited | Information & communication | 1995 |