| T Solan Properties Limited | Real estate | 2021 |
| T Spark Electrical Services Ltd | Construction | 2018 |
| T&A Keene Holdings Limited | Financial services | 2025 |
| T&B Harvey Trading Ltd | Real estate | 2016 |
| T&C Property Holdings Limited | Financial services | 2025 |
| T&D Management Consulting Limited | Information & communication | 2016 |
| T&H International Services Ltd | Administrative & support | 2026 |
| T&O Contracts Limited | Construction | 2020 |
| T&Sl Consulting Limited | Professional & scientific | 2022 |
| T-Dar Consultancy Limited | Administrative & support | 2024 |
| T-Pharma Limited | Wholesale & retail | 2015 |
| T-Shirt Bakery Ltd | Manufacturing | 2020 |
| T. L. W. Design & Photography Ltd | Professional & scientific | 2020 |
| T. Stoner Limited | Administrative & support | 2016 |
| T.E.N. (the Education Network - Employment Services) Limited | Administrative & support | 1996 |
| T.En Advanced Materials & Catalysts UK Limited | Manufacturing | 2021 |
| T.H. Jewellers Limited | Manufacturing | 1976 |
| T.J. Stell & Co Ltd | Professional & scientific | 2021 |
| T.P.L.P. Ltd | Real estate | 2011 |
| T.T.N-Nail Ltd | Other services | 2023 |
| T1 Bistro Ltd | Hospitality | 2024 |
| T1 Sports Limited | Arts & recreation | 2024 |
| T2 Medical Limited | Health & social care | 2024 |
| T20 AF Midco Limited | Financial services | 2023 |
| T3 Transformation Consulting Limited | Professional & scientific | 2024 |
| TA Smith Services Limited | Professional & scientific | 2017 |
| TAB Refractory Construction & Maintenance Co. Limited | Manufacturing | 1974 |
| TAB Shopping Ltd | Wholesale & retail | 2018 |
| Tabam Limited | Real estate | 2019 |
| Tables Solutions Ltd | Other services | 2023 |
| Tabutribeuk Ltd | Professional & scientific | 2026 |
| Tacho Download Limited | Financial services | 2017 |
| Taco Bar and Kitchen Ltd | Hospitality | 2019 |
| Tactical Learning Ltd | Information & communication | 2025 |
| TAD Construction Projects Limited | Construction | 2014 |
| TAD Systems Ltd | Professional & scientific | 2017 |
| Tadams Engineering Limited | Administrative & support | 2026 |
| TAE Technical Limited | Professional & scientific | 2017 |
| Taff's Motor-Fix Ltd | Wholesale & retail | 2010 |
| TAG Driving School Ltd | Education | 2024 |
| TAG Property Management and Lettings Ltd | Real estate | 2023 |
| TAG Site Engineering Ltd | Professional & scientific | 2020 |
| TAG Support Services Limited | Professional & scientific | 2022 |
| Tagii Consultancy Limited | Professional & scientific | 2020 |
| Tagra Management Systems Limited | Information & communication | 2003 |
| Tahmeed Khan Ltd | Administrative & support | 2021 |
| Taikun Advisory Limited | Information & communication | 2019 |
| Tailored Vending Services Ltd | Hospitality | 2024 |
| Tailztelltales Ltd | Wholesale & retail | 2024 |
| Tait Energy Ltd | Administrative & support | 2026 |
| Taitt LLP | | 2016 |
| Takmo Limited | Administrative & support | 2015 |
| Takuetsu Ltd | Administrative & support | 2013 |
| Talaliums Ltd | Administrative & support | 2023 |
| Talascend Holdings Limited | Professional & scientific | 2002 |
| Talascend Limited | Administrative & support | 2001 |
| Talbot Electrical Contracting Limited | Professional & scientific | 2019 |
| Talbot Engineering Service and Repairs Limited | Manufacturing | 2019 |
| Talbot Malone Design Limited | Administrative & support | 2008 |
| Talc Holdings Limited | Real estate | 2022 |
| Talent Heroes Limited | Administrative & support | 2017 |
| Talent Hunting Recruitment Ltd | Administrative & support | 2026 |
| Talkhub C.I.C. | Health & social care | 2020 |
| Talking Wills & Trusts Limited | Administrative & support | 2016 |
| Tall Trees Country House Ltd | Hospitality | 2024 |
| Tallam Consultancy Services Limited | Real estate | 2010 |
| Tallam Solutions Limited | Information & communication | 2023 |
| Tallisworth Limited | | 1985 |
| Talon Investments Limited | Real estate | 2026 |
| TALOS360 Limited | Information & communication | 2009 |
| Tamarind Thai (NW) Limited | Hospitality | 2024 |
| Tameside Aquatics Megastore Limited | Wholesale & retail | 2025 |
| Tamsan Compressors (UK) Limited | Wholesale & retail | 2010 |
| Tamy AR Ltd | Hospitality | 2025 |
| TAN Evans Ltd | Other services | 2019 |
| TAN Investments Limited | Health & social care | 2025 |
| Tanager Limited | Administrative & support | 2023 |
| Tanas Food & Wine Ltd | Wholesale & retail | 2021 |
| Tandoori Street Ltd | Hospitality | 2026 |
| Tangier Central Taunton Limited | Real estate | 2021 |
| Tangier Central Taunton Top Limited | Construction | 2023 |
| Tangier Central Taunton Two Limited | Construction | 2022 |
| Tangier Security Trustee Limited | Other services | 2022 |
| Tanglewood Financial Services Ltd | Administrative & support | 2022 |
| Tangs Bottom Limited | Hospitality | 2019 |
| Tank Bar Warrington Limited | Hospitality | 2025 |
| Tank Technology Ltd | Administrative & support | 2022 |
| Tanplan Ltd | Administrative & support | 2025 |
| Tanseys Coaches Limited | Transport & logistics | 2022 |
| Tanta Home Solutions Ltd | Wholesale & retail | 2023 |
| Tanvik SAI Consultancy Limited | Information & communication | 2015 |
| Tanya Isaac Consulting Services Limited | Professional & scientific | 2014 |
| Tanya's Pilates Club Limited | Other services | 2020 |
| Tapiit Holdings Ltd | Financial services | 2020 |
| Tapton CQV Limited | Administrative & support | 2025 |
| Tapton Grove Consulting Ltd | Construction | 2025 |
| Taqtaq Limited | Wholesale & retail | 2024 |
| Tarbuck Communications Ltd | Administrative & support | 2025 |
| Target Staff Ltd | Administrative & support | 2026 |
| Targeted Chemistry Support Limited | Professional & scientific | 2020 |