| TIP UK Alpha Ltd | Information & communication | 2020 |
| Tipple on TAP Ltd | Hospitality | 2017 |
| TIR Y Dail Ltd | Real estate | 2025 |
| Tirita Ltd | Manufacturing | 2012 |
| Titan BIZ Hub Limited | Wholesale & retail | 2024 |
| Titan Facilities Limited | Administrative & support | 2019 |
| Titanium Design Limited | Professional & scientific | 2001 |
| TJ & SJ Adkins Farm Limited | Agriculture & fishing | 2019 |
| TJ Robinson Group Limited | Agriculture & fishing | 2019 |
| TJB Sports Massage Ltd | Arts & recreation | 2017 |
| Tjekvik (UK) Limited | Administrative & support | 2021 |
| TJH Property Services Ltd | Real estate | 2018 |
| TJP Developments Limited | Construction | 2019 |
| TJR Consultancy Limited | Information & communication | 2021 |
| TK Valeting Limited | Administrative & support | 2025 |
| TKC Property Ltd | Real estate | 2021 |
| TL Guys Ltd | Administrative & support | 2020 |
| TLC OUT of School Care Community Interest Company | Health & social care | 2012 |
| TLC Property (Shropshire) Ltd | Real estate | 2017 |
| TLC Synergy Ltd | Wholesale & retail | 2018 |
| TLG Beauty Limited | Other services | 2024 |
| TLR Management Ltd | Real estate | 2016 |
| TM Fitness Ltd | Arts & recreation | 2023 |
| TMC Farringdon Ltd | Professional & scientific | 2014 |
| TMD Brickwork Services Ltd | Construction | 2020 |
| Tmls Property Ltd | Administrative & support | 2013 |
| TNB Property Holdings Limited | Real estate | 2017 |
| Tolbrook Limited | Households | 1989 |
| Tolsons Court (Fazeley) Residents Management Company Limited | Real estate | 2024 |
| TOM Evans Design Limited | Professional & scientific | 2019 |
| TOM Groves Brickwork & Construction Limited | Construction | 2016 |
| TOM Sullivan Design & Art Limited | Professional & scientific | 2021 |
| Tomczak Ltd | Information & communication | 2019 |
| Tometoyou Ltd | Wholesale & retail | 2021 |
| Tomlins Trading Ltd | Transport & logistics | 2023 |
| Tomollie Ltd | Information & communication | 2023 |
| Toms Cafes Limited | Hospitality | 2021 |
| Toms-Arbel Ltd | Construction | 2022 |
| Tonal Ltd | Wholesale & retail | 2010 |
| Tonic Digital Solutions Limited | Arts & recreation | 2024 |
| Tonic-Refreshing Lifestyle Management-Ltd | Arts & recreation | 2004 |
| Tony Brown Digital Consulting Limited | Information & communication | 2025 |
| Tony Willday Sales Agencies Limited | Administrative & support | 2006 |
| Top Class Building and Lofts Ltd | Construction | 2016 |
| Top Ground Limited | Agriculture & fishing | 2025 |
| Top Table Personnel Ltd | Administrative & support | 2023 |
| Top Turkish Barbers (Shrewsbury) Ltd | Other services | 2026 |
| Topdraw Games Limited | Manufacturing | 2009 |
| Tornado Systems Limited | Information & communication | 2006 |
| Toscar Limited | Professional & scientific | 2015 |
| Total Access Enviro Ltd | Water & waste | 2026 |
| Total Hospitality & Event Management Limited | Professional & scientific | 2016 |
| Total Physio Clinic Ltd | Health & social care | 2024 |
| Total Property Estates Ltd | Administrative & support | 2023 |
| Total Waste Services Ltd | Water & waste | 2018 |
| Total Websites Ltd | Information & communication | 2020 |
| Total-Focus UK Limited | Professional & scientific | 2001 |
| Totally Wild Access Limited | Administrative & support | 2021 |
| Tour Data Solutions Ltd | Information & communication | 2014 |
| Touring Car Media Limited | Arts & recreation | 2022 |
| Towan House Holiday Homes Ltd | Hospitality | 2023 |
| Towler Shaw Roberts LLP | | 2003 |
| Town Thorns Care Limited | Health & social care | 2024 |
| Townsend Farm & Fisheries Ltd | Agriculture & fishing | 2026 |
| Townsend House (Plymouth) Management Limited | Real estate | 2021 |
| TP3 Media Limited | Information & communication | 2023 |
| Track and Field Academy Limited | Arts & recreation | 2026 |
| Tracker Recruitment Ltd | Administrative & support | 2021 |
| TRADECOW2024 Limited | Financial services | 2024 |
| Trafford Nine Limited | Financial services | 2019 |
| TRAIN4SECURITY UK Limited | Education | 2025 |
| Training With Confidence Limited | Professional & scientific | 2017 |
| Transformative Tattoo's Limited | Other services | 2023 |
| Translators House Press Ltd | Information & communication | 2026 |
| Transparent UX Ltd | Information & communication | 2018 |
| Travel Time and News Limited | Wholesale & retail | 1999 |
| Travelling Kiwis Limited | Health & social care | 2010 |
| Trederwen Developments Limited | Real estate | 2025 |
| Tree Tops Kids Club Ltd | Education | 2013 |
| Treeman Tree Specialist Ltd | Administrative & support | 2016 |
| Trees to Grow Limited | Agriculture & fishing | 2006 |
| Treewise Tree Services NW Ltd | Administrative & support | 2026 |
| Tregwylan Management Phase II Limited | Households | 2001 |
| Trenali Homes Ltd | Hospitality | 2026 |
| Trench Lock Management Company Limited | Households | 2008 |
| Trencher Hire Limited | Manufacturing | 2022 |
| Trevor Haggart Associates Limited | Professional & scientific | 2003 |
| Treyarnon Consulting Ltd | Professional & scientific | 2025 |
| Tri-Locker Limited | Administrative & support | 2023 |
| Tribolysis Testing Services Limited | Extraterritorial | 2015 |
| Trico Limited | Manufacturing | 1928 |
| Trico Suzhou Investments Limited | Professional & scientific | 2005 |
| Trident Express Ltd | Wholesale & retail | 2024 |
| Trinity Care PVT Ltd | Health & social care | 2013 |
| Trinity Gardens (Loughborough) Management Company Limited | Households | 2015 |
| Trinity Havens Ltd | Education | 2018 |
| Trio Brothers Limited | Real estate | 2026 |
| Triple a Collectibles Ltd | Wholesale & retail | 2025 |
| Triple Point Commissioning & Electrical Services Ltd | Professional & scientific | 2019 |
| Triple Point Group Ltd | Professional & scientific | 2021 |